Jaguar V12 5.3L Series 3 HE in an AC Cobra Fuel injection Jenvey throttle body conversion
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- Опубліковано 6 жов 2024
- This is a general guide to how I converted my Jaguar V12 5.3L series 3 engine from carbs to fuel injection with Jenvey throttle bodies and Emerald m3d electronics.
This is not a professional comprehensive guide as to 'how to' and if you are unsure please seek advice from a professional mechanic.
It explains my process with a lot of the hard elbow grease cut out otherwise the video would be 3 weeks long! Its just a visual companion guide to the detailed instructions provided by Jenvey Dynamics and Emerald m3d.
I hope its of some use as I was daunted and overwhelmed when it all first arrived and not having a clue where it all goes!
Also be prepared for some fabricating of brackets and some problem solving.
Once youve got what all the parts do it actually boils down to how youre going to attach them in the best way possible.
IF you have any questions please write in the comments section
One final word is make sure that the marelli sensor (This is the hardest sensor to mount.)has been properly located in the correct position mentioned in the instructions provided. If this isnt or you are unsure please do not start the engine and get a professional in before turning the ignition or get the car trailered to an engine specialist like Emerald who will adjust your work and make it right!
Beautiful. That exhaust note at 25:23 brought the hairs up on my neck. And a first-time start shows how much care you put into the rebuild. Nice job.
Thanks Richard!! I was surprised as anyone else when it started first time! As I said I did a check and then recheck around 8 times to make sure everything was in the right order!! I’m glad I got your hairs up! It sounded better in person too!:)) many thanks for taking the time to comment
@@AlbydickBall think id keep the 351c..might be a truck engine, but last forever, never give any trouble. all they need is 302c heads, or alloy, mild cam, but, it gives 12.1 comp. so lpg is the go unless you dish the pistons, say from a 300.L6, . even a 300 L6 in that would give gobs of torque.mildly tuned. were talking ford here..
@@harrywalker968 hi harry thanks for watching and taking the time to comment! Yup I’m with you stick with the 351. I’ve got a 67 Pontiac 400 and LoVE it!! The ford was always my original choice but picked this car up for a song as really no one wants a v12 cobra.the engines are expensive to fix. But I’m now loving it!:)
Totally Awesome ❤❤❤❤❤❤❤
Mate, what a great video. You're obviously very skilled at what you do. Thanks for taking the time to share it.
Well thanks for taking the time to comment! I’m not sure if I’m skilled just methodical which probably lends itself to being skilled I guess!! I did check the whole system around 8 times before I started it and each check was about half hour just making sure everything was in the right order! I would of been gutted if I did damage to it!
I just started watching but I honestly think you could make it as an automotive UA-camr if you wanted. Thanks for the great video and a V12 with ITBs.
@jonkillian9434 Hi Jon that’s really kind of you. Never thought about it as was just doing this to help people but I might follow your advice! Thanks for watching:)
I'm with Jon, just randomly found this vid and thoroughly enjoyed it. You should make more content :)
@@greybeard27 very kind words Mr Grey beard! I’ll have to find something else that I can potentially not break and get away with it!:) thank you
It actually sounded good to my laymans ear when you first got it and some of the bits didn't all work at the same time, but hearing it now is amazing. Top job 👍
Thank you nervous penguin!
Yes it all sounds great and am well chuffed with the result!:)
Thanks for a great video!
I have a 1973 XJ12 that I've converted to use Webers but I really don't like the standard ignition so I wrote my own for a PIC18F4550 micro. It uses absolute position sensors on the ends of the cams (got that idea from Ferrari) to decide when to fire the ignition. It has vacuum and water temp sensors to modify the spark map.
I decided to use two V6 coil packs and I went with the ones from the Vauxhall Omega (non-oem about £30 each).
Be careful with that vacuum sensor hose you installed. You've used soft silicone tube which will get even softer as it heats up.
Soft tubing is not a good idea to use as the vacuum can collapse the hose.
It may be absolutely fine but if your engine misbehaves at higher RPM (ie higher vacuum) it is something to consider.
Ok blimey! It’s sounds like you really do know what you’re doing! You’re must run pretty sweet! All I know is to how to follow instructions!
Yeah someone down in the comments mentioned about those silicon hoses and I have already replaced them with metal. Makes total sense as they collapse with heat!
Thanks for taking the time to comment !:)
About 30 years ago I put a lightly tuned Jaguar 5.3L V12 into a Dax Cobra - a very tight fit but it sounded glorious! I paired it with a Getrag dog-leg box that was quite rare at the time but found in a wrecked Opal Manta if memory serves me correctly. You should definitely do more videos. 👍
Ha awesome!! I’m guessing you still don’t have it? This dax was built around 40 years in ‘83 or there abouts…it was one of the first chassis they did. Thanks for the comment! I’ll see if I can do more!!:)
@@AlbydickBall Mine was built when they had just finished their first prototypes of their GT40.
@@sp00ky1969 ah nice! I always liked the Gt40 just because how they came to be! Along with the Le Mans cobra Daytona !
These are the UA-cam videos i like to watch. Down and dirty doing what you love not doing things because of sponsor parts
Thanks ! Really appreciate that! Just doing what we all love hopefully without too many commercial breaks!!
Absolute cracking video . Only things I would have done differently is I would have had 1 lambda sensor on each down pipe and different coils and leads but that’s my preference . Each to their own hope I haven’t offended anyone
Well you haven’t offended me as I think you’re right! Having just one lambda on 3 cylinders doesn’t really give an accurate reading. Don’t know much about the coils or leads…what would you of recommended? Thanks for taking the time to comment
@@AlbydickBall one of the ways I would have done the coils and leads was coil on plug if they could have been made to work some how but my favourite way of doing it would be the same set up as on a LS v8 having very high voltage smart coil per cylinder.
@@Firby1988 yeah that would of been a neat solution!
It sounded nice coming up to the Torque curve. Big difference in output.
Hi Mike, thanks yup there was massive difference. It’s a shame I didnt have a go on the rolling road before i did the work and then we could see genuinely what got improved. I’m taking her to Santa pod drag strip this summer as I went there 3 years ago before the work so that should give a rough idea how it has improved
Excellent! I’ve had my Jenvey/Emerald set up for nearly 20 years now and it’s never missed a beat.
Hi Kevin! Ah a fellow Jenvey emerald man!! Nice! Jenvey is now run by his son after the father retired! Great family business!! Nice to know like emerald that quality lasts!
What car did you put them on?
@@AlbydickBall they are fitted to a Fisher Fury kit car with a 2L Zetec engine.
Very cool. That exhaust note will drive American rodders crazy till they find out what is lurking under the hood.
Nothing like a V12...you could hear the turbine like way it ran and with snappy throttle response courtesy of that trick throttle body setup.
Like to see more of this car once fully sorted.
Thanks for posting!
Haha perhaps I should go on a road trip across the states! Thanks for the comment. Yup it’s snowing at the moment in UK so once the suns out (2025!) I’ll post more vids!:)
That was ace! Nice to see a mechanically-sympathetic dyno operator (for a change!) taking the power up slowly and checking the temps/mixture along the way ....SUBBED!
Thanks Greg! Yes Keith was brilliant at emerald and they defo know what they were doing! Although it sounded like the engine shouldn’t be going that fast!! Even watching for pre detination with a camera…all very professional!
@@AlbydickBall - Thanks Alby, agreed.
BTW, from your intro it looked like these were tentative steps into the world of YT stardom? You may be relieved to know that for the majority, we aren't remotely interested in 'polished' front-of-camera' performance, stunning B-rolls and all that nonsense, interesting content is paramount and a likeable, non-bulshitty, chap-in-his-shed demeanour is ideal, I think the media types refer to it as 'relatable?' Anyway, I'm rambling ..... The very Best of British in your endeavours, we are all watching with interest!
@@gregtaylor6146 oh Hahahah!! Yeah no this was never a step into the limelight!!! It was genuinly a how to help video for those that have t done EFI conversion. Plus I don’t have the face for it!!!I was overwhelmed when I first got the kit so hopefully this will help out other people. ….I shall hopefully remain relatable!!:)) many thanks for taking the time to comment:)) and best of British to you!:)
@@gregtaylor6146 oh and I’m not sure there are many people watching….!:)) I’m sure big brother is somewhere though!
Exceptionally well put together video for a first timer!
Ah thank you!! I’m really warmed by the response by everyone. Wasn’t meant to be a ‘look at me’ video and hopefully just helpful points to anyone who wants to try it!:) I might do another one but it won’t live upto this one!:)
A very commanding and credible presentation of this task, well done. You're a bit different which makes you interesting to watch and you speak with such confidence about what you're doing.
Hi Malcolm, thanks for taking the time to comment and kind words. Actually the whole
Process was a learning curve for me so was just methodically going through it. When I finished I rechecked the whole set up about 10 times before starting!
nice. I watch a lot of automotive youtubes…. you sound like you could have a go at it. good job
impressive you showed us the bits you removed and they were set in there just for the viewers benefit. thats dedication and its very generous to the viewer. so you have good spirit which viewers are attracted to
Hi!! Ah that’s very kind of you! Yeah this video was done with the viewer in mind and hopefully would be helpful to anyone setting out on this type of conversion! I’m happy to answer any question that peeps may have on their conversion. I’m not a pro but having successfully achieved a working engine then perhaps I could advise! I make take your advice and do a few more…just need to find more engines! Would love to do a V8 5.7 conversion to Jenvey ITBs!!:)
Mind blown! I am totally floored at the whole project! Carroll Shelby would have a fit over the V12 and the TBI but it's unique and you obviously did a fantastic job all the way.
Haha I know he’ll be turning in his grave!! Although having said that I live in the UK village where AC produced the original car, before carol took it over to the states. So putting a British engine into a British body ‘kind of’ seems correct! Although I get where people think it’s sacrilege. Thank you for the kind words and for taking the time to watch!:)
Very well filmed, great narrative, and top craftsmanship! Please do more stuff like this!
Very kind words! Many thanks ! I’ll have to find some more vehicles to convert!!
Looks and sounds amazing! Well done. First time I see a vid with a switch from Webers to ITBs from Jenvey's on a Jag V12
Thanks! yeah it was an interesting journey getting these fitted and was totally overwhelmed when i first started so hence the video to 'help' people!!:) The down webers were past their best, although i thought this was a common conversion...perhaps not!
This is way more than cool… I totalt love it. The looks, the Sound is fantastic. 👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻👍🏻
Ah cheers man! Appreciate that!! She is lovely!!;)
I remember the Dax Cobra kits from back in the day. I believe their thinking was that, if you were buying a Jag as a donor car for the suspension and switchgear (plus a few bits and bobs from things like the Triumph Dolomite), then you'd end up with a body shell (usually full of rust - not like you'll buy a pristine example if you're just stripping it for parts.) But you'd often also be left with that lovely V12 engine, which seemed to the blokes at Dax like such a wasted opportunity. And so it wasn't wasted after all. 😁
Yeah not wasted! This is an old dax from the 80s I think a year after they started and yup the V12 jag is a lovely engine but has it cons….all the running gear and inboard rear brakes were quite innovative thinking at the time back in the 70s. It was the perfect UK donor car for the dax! :)
This is my cup of tea! The real thing and i loved it!
Really great video, just find your channel!
The pure joy you show is contagious and I sit here with a big smile.
Thanks!
Hi my Norseman! That’s really kind of you thank you! My best comment so far! I was just well chuffed it worked as haven’t done anything like this before and it seemed there were so many factors that could go wrong!!
@@AlbydickBall Haven't done it before and then you bring to life a 12 cylinder Cobra monster.
Deserves Respect!
@@thenorseman2804 thanks dude! I like a challenge! And what’s the worse that can happen?!;)))) haha
@@AlbydickBall 👌
Your the 1st person ive heard that sounds exactly like the engine they own 😁
Hahahahahh! Best comment so far!!:)))
So intrigued that you too are just a skilled enthusiast within the mechanical world, that I put you to watch later. I'll be back to let you know what I've learnt.
Hah thanks! Well perhaps not skilled just as you say enthusiastic! Yes let me know what you learnt! It good be that you learn never to buy a jag V12 engine!!:))
I don’t think you mentioned how the aluminium fuel link tubes sealed into the fuel rail between each pair of throttle bodies? Can I also compliment you on the continuity of progress on fitting this conversion which made perfect sense. Nicely done sir!
Hi Phil! Thank you for the kind words! Yes I wasn’t even sure I was going to do a video so I missed a few things off. I mentioned how it was done by cutting down the tubes but didn’t show it on the video:( sorry they are sealed by little o rings that are already in the main hexagonal fuel and they just push fit
Get yourself some rubber grease for those O-rings mate, you won't regret it. Very good instructional video; and you can say you're not a car guy as much as you want. If you're doing this, and making an excellent video on it, you're a car guy.
Thanks mate! It’s my first time doing something like this and I’m pretty sure others could do a better job but it all seemed to fall into place! On it with rubber grease!:)
Great job! You like to tinker! So do I. I put a SRT Viper V10 in my FFR Cobra. Great fun!
Haha no way! Must of been way faster! And way more fun!:))
The Jag V12 was a great engine - with the ugliest carbs ever. One SU or Stromberg means a lot of troubles, two ore more: Never ending Problems.
I like the way you solve this problems!
Haha yeah the engine is so pretty and then they bunged on industrial looking carbs that were crap! Thanks yeah problem solved , looks good runs great!:)) thanks for taking time to comment :)
Fabulous engine!!!!!!
Great to see a Jenvey throttle body conversion....
Thanks! Yeah they are pretty engines and pretty throttle bodies!!!:)
That's bring me good memories, I modified also a Jaguar V12, with racing cams and modified induction. Very good video
Thanks Daniel! Yeah it’s fun messing around with V12s! Was your engine in a XJS?
@@AlbydickBall yes and not a HE
An inspiration sir! Makes me want a V12 to play with in my workshop ... 🙂
Haha thank you! Worried at first as they look so complicated but great engines and already fun to improve on something!:)
You built the best sounding Cobra!!
Thanks king earl!:) yeah I was really never into a V12 sound as I was a v8 fan but now I’m all over it! There’s a classic sound to it!
Great stuff but must turn volume all the way up to hear/even with headphones on. This car is awesome guys.
Hi Craig
Thanks for comment! Yes we are well chuffed with result! Ah didn’t know the volume sounded low, I’ll make a note for the next video
A very nice sounding engine but i have a couple of comments that you might be interested in:
1) The vacuum pipe I suggest be substituted for a metal one as the silicone(?) based pipe will soften when the under bonnet gets hot and the pipe will collapse under vacuum, which will cause unfathomable problems.
2) The gauze induction trumpet filters are not free flowing and will restrict the intake as has been shown on dyno testing, beside not filtering anything except stones. I suggest you reinstall the K&N Filters as they are virtually non-restrictive and are very effective on filtration.
Hi Clive! Thanks for taking the time to comment. And thanks for compliment of the nice sounded motor! Ah yes that’s great advice. As I said I’m no mechanic so my knowledge is limited. I hope I haven’t mislead anyone. Yes they are silicon and yes it gets hot under there and yes actually that sounds completely logical!! They get hot then soft and then collapse.
I understand what you’re saying about the filters as they’re just effective enough to stop rocks and birds!! Actually and weirdly enough Keith and Dave at Emerald were interested to see how restrictive they were so we did a run without them on and there was negligible difference ! Same HP output at 6000rpm!! But yes the K&N would be the better choice (sold them already though! Doh!) many thanks :)
I’m still learning! Sorry when you said metal pipes do you mean like a brake pipe, ie solid? And then have a rubber hose connected to attach the ends to the map sensor and also the swirl pot?
@@AlbydickBall Thanks for the prompt reply. The tests that I saw were on performance V8s where there was a noticeable increase in torque and horse power with open trumpets. It may be that your V12 can only use the air flow equal to that through the restricted inlets so that removing them will make no difference. Other tests have shown that the K&N filters are a very small restriction to flow especially where they are combined with trumpets, even F1 teams use them and they have the luxury of frequent engine builds. For a road car then filters + trumpets are the best solution.
As you have sold the previous filters why not fabricate an air box for each bank of throttle bodies and stick a K&N on the end of each one? That way you could retain the trumpets and have an efficient inlet system for the price of just two filters?
The gauze that is used for these trumpets actually reduces the free air area i.e. the area of the open trumpet down to 25-30% so you can see that it is a significant restriction, notwithstanding that the design of the trumpet, which is bell mouthed, shapes the inlet air to create as far as possible a laminar flow as well as being accounted for in the tuned length of the intake. The gauze stops that laminar flow from being produced by creating small individual streams of air that then have to combine in a turbulent way to be sucked into the bore - not very efficient.
Keep up the good work and lets see and hear the final result?
Ok wow yes you definitely know what you’re talking about! Actually Jenvey offered a ‘foam’ filter that slots over the trumpets to produce that effect you were talking about but unfortunately the space under the bonnet is so restrictive it didn’t fit! Yes I can definitely see how it should restrict air flow and yup the V12 can only use a certain amount of air through the inlets , it having more inlets than a v8 that size so perhaps it’s the air intake area is already larger than it needs to be? I’m just guessing!!
Yes the result is at the end of the video! It ran perfect! Very surprised!
It sounds like you’re an engineer!! Haha
@@AlbydickBall Absolutely spot on. I would use Kunifer (CuNi) pipe that can be had in various internal diameters 4, 6, 8mm for brake, clutch and diesel injector pipes etc to suit your application, its also impervious to the nasty ethanol based fuel we now have (although I only use high octane, which in the Midlands is generally ethanol free) I would use your rubber hose to make the short connections at each end that will allow movement between engine and chassis fixed components. You could also use stainless steel, aluminium or copper minibore that can be had with a chrome finish (from plumbers merchants) but these are not as easy to form as Kunifer. (Kunifer can be polished to provide a light bronze colour).
The problem with collapsed vacuum pipes I have seen many times where they were used on the carb/vacuum advance on dizzys, where people used any old plastic pipe they had lying around. The manufacturers used a specially hard pipe that was resistant to collapse and softening.
I really enjoyed the video....well presented and what an epic finish ....the sound....😍😍😍
Thank you Brian for the kind words! Genuinely surprised it fired and ran perfectly without mapping on the first start up! Very happy with the result and as you said also the sound!!:)
YOU MAKE IT LOOK SIMPLE APSOLUTELY AMAZING JOB
Hahah thanks! I didn’t show all the complicated bits inbetween!:))
Bravo, keep up your channel and your great engine work, really superb if this is your first stab.
I always respect the ‘Man In a Shed’ approach anyway.
Ah thank you! Very kind words. Yeah it was my first and only stab at a video. I might do another as have a 67 Pontiac I’m working on at the mo!:)
Great video, loved your humble tone and the way you'd disconnected the components so you could quickly demo their removal. One question - how well will the coil packs handle the heat in their current placing between the cylinder banks?
Thank you! I’m only humble because I’m not too sure exactly what I’m doing!! Yes that was my concern for the coil packs being mounted there tucked right where all the heat is but it seems to work and I was advised to put them there my people who knew more than me!:)
Magnificent!!! There’s a lot to love about your project.
Thank you clay! I loved doing the project!:)
really enjoyed that video especially as I am building engine (Mercedes M100 6.9) and want to go a similar route..
great work
Thanks Gary! Yeah once it’s done you will get endless satisfaction starting her on the button!! And smooth response! Mine was an absolute pig before so any improvement was great! Good luck in your build
love love love this vid I now know how I want to go with my Jaguar V12
Ah amazing Robert!! Thank you. Yeah the V12 jags when done right are probably the best engine on the planet! Plus they look so pretty…..and sound sick with straight through pipes
Cool project, the algorithm has started sending people your way...
Oh ha right! I did wonder why it was picking up quickly over the last few days!! How does it work as haven’t really used UA-cam before?
Thanks
I hope you drop a video of it running on the road or track. It’s a fucking monster.
Haha! Well I tried to get it on the track but was denied in the other video!!:(( I’ll just have to go street racing instead!:)
Wow, start up on first try. Great work!!!
Trust me I was surprised as you were!!:)) honestly couldn’t believe it!
This is the best beard I’ve see in a long time. Did you start growing it the same time you started the conversion? Sweet engine.
Haha! Helloooo Keith!!! I was clean shaven when I started!
Excellent! Nice work. Thanks for sharing. The overall build of your car is fantastic. I prefer the fastback hardtop on any Cobra. Cheers.
Thanks Dave for the kind words! Yeah I was always a fan of the hard top. Not the short stubby ones though! This was a project i did a few years ago before I even thought about doing a UA-cam vid
Nice! Im in the process of wiring in a new engine ecu in my Cobra and it would be great if it first up like your did on the first try haha
Wow ! Let me know how it goes!! Yeah I honestly didn’t expect it to start first time! There are so many factors that could be wrong but it seemed to all fall into place!
I appreciate your enthusiasm and approach. For a conversion using the Jenvey parts shown, what is the net height from say the cam covers to the top of the filters please.
This would help to understand whether this is viable for a XJ12 saloon...
Suggestion...ask your MoT station to give an opinion on the car's brakes...[on one of the Autopia episodes the engine conversion was a success...but the car has no brakes to speak of !].
Hi, happy new year! Thanks for the comment. Yes I’ll measure the height to see if it’s a viable option. Although actually if you phone up Jenvey they would probably know the compatibility for the XJ12 and also have the correct solutions. I’d imagine this set up would work in the saloon as after all it was made with that engine and car in mind but I’ll let you know anyway the height !
So yes strangely enough I had had problems with the brakes (owned the car for 5 years) and they were sticking and not great so I replaced the whole braking system from pads to servos and now it stops on a dime almost instantly. The brakes are also from the xj12 car.
What was the problem with the brakes? Did they foul up after the conversion? Or just generally bad on the cobra?
@@AlbydickBall Thanks. My point on the brakes is that big power needs reliable stopping power especially on a car that is not used as much as a "daily". The video in question has a builder take out his fav UA-camr for a drive with a 900 bhp muscle car (?) car...and the brakes fail. Take care and enjoy your car 🙂
@@Andrew-vx2ls oh right blimey!!! That would be a bit awkward!!hahha!! Yes brakes generally are a good thing! Luckily mine work , perhaps using it as a daily will help!!;))
Great video, I did see a chunk of crap and a few bread hairs disappear into the uncovered inlet ports lol
Haha I was super paranoid about that!! Probably explains the misfire!!;)
Fantastic! I look forward to seeing more videos.
Thanks James! I’ll see if there’s anything else I can film! I’ve got a 67 Pontiac so I might do something with that!
Nice change from LS chev
Yeah it’s different! It’s like marmite! Hate it or love it!:) many thanks
great video, well done, hopefully you will do more!
Ah thank you Andrew! Yes I might do but this was only really to help people out. I have a few Landrovers that always need work so perhaps I can film those breaking down!!:))
This is awesome great looking engine. Wonder why you didnt seperate the coil packs to either side of the distributer hole for a cleaner look?
Hi den! I agree and That was actually our original intention as we elongated the engine breather bracket but where the throttle bracket was it didn’t give clean access to the HT leads so put them both at the front. Shame!
Congratulations on a great video, car looks and sounds incredibly.
Thanks Martin! Yeah I was well chuffed with the result! Going to take it down to Santa pod and see what the quarter mile is now. Did it a few years ago on carbs so be interesting to see the difference! Thanks for watching!:)
V12 Cobra? More tea please, vicar!
Hahah!!! It’s marmite! Love it or hate it! I’ll have marmite sandwiches with my tea please!:)
Absolutely fabulous. Just what I've dreamed of doing all my long life. :-) Nick
It’s never too late!:)))
Love it, great job ❤️, I have an xjs convertible and am replacing the 3speed auto with a Richmond close ratio 5 speed,
Hi Jonathan! Thank for comment!:) I’ve only started to look at autos as have just bought a 67 Pontiac. Is your auto box a th350? Why are you changing ? Is it because that 3 speed is a bit lazy?
A bit lazy? The XJS do come with the GM350 auto and it is a power stealing slush box. I had been researching ways to get more power but really swapping that 350bfor a 5 speed manual allegedly completely changes the car.
Did you get a kit for the trans swap or are you just piecing it as you go? I've got an 88 xjs hard top. I think those cars are gorgeous and I wasn't expecting tire destroying burnt outs but I was definitely expecting more from an (alleged) 275bhp V12.
@@erikbrown207 hi Erik! Thanks for commenting. Yup I’ve never had an auto so I think I was being prejudice!! Haha! They do tend to absorb power and manual is the way forward. Although those 350/400 boxes are great! I’ve got one on my 67 pontiac and love it but has to driven differently !:)
No doubt it's a solid, reliable workhorse of a transmission. I've had one in multiple jeeps I've owned but i have different expectations in an old wagoneer and a V12 jaguar.
@@erikbrown207 yeah especially as they were really an American market box and we don’t have the facilities here to maintain them as well as the Americans
The jeep straight 6 has a long coil pack ,you can use one per bank on your V12... They are waste spark also...
Hi Jonathan, thanks for the info. I’m not too sure where these coil packs are from although someone mentioned they were Vauxhall? They seem to work though:)
@@AlbydickBall I checked out the jeep long coil packs by getting a used one off eBay at a very reduced price and the coils out puts make for a very short High-tension lead as each out put is right there by a plug... Any closer in fitment and you could just plug them straight onto the plugs
stunnig car, marvelous engine sound, very nice! thank you for sharing! 😃
Thank you for watching! I appreciate the comment! I defo like the car!!:)
By far one of the sexiest cars I've ever seen. 👊🏻🙏🏻
Hahah thank you! I’ll let her know!:)
That is a tight fit in that old Cobra.
Like you wouldn’t believe! With the old Weber carbs on and filters there are 4 dents in the bonnet where the bolts on the top and bottom carbs have gone through when the bonnet was slammed! , an inch clearance on the bulkhead and an inch against the front crossmember!
@@AlbydickBall I admire your willingness to actually attempt it those XK motors are big heavy lumps ( I own 3 ). It must be really satisfying to know that you actually achieved it.
@@76-UVB yeah I appreciate that. Satisfaction in full! Especially as I’ve never worked on them before or indeed many other engines and was jussi daunted when I started!
That's an amazing project. Kudos to you 👏
Thank you!!:) wasnt planning on Kudos but will accept it if it’s there!:)
Excellent conversion mate
Cheers Jim! Well chuffed with how it ended!!
Excellent work, great sound! Do you know the BHP figures before the conversion?
Thank you!:) no I don’t but I’m guessing it was around the 300 mark as that was the factory spec. I definitely know it wasn’t producing that though as the carbs were pants!!:)
Awesome, simply awesome!
Thanks Chris! It’s actually nice to know that people are interested in this! And yes driving it was even more awesome!:)
Well done, engine does sound superb. I had wondered whether the plates holding the coil packs etc would be better finished in black so they'd be nearly invisible but with it completed they were anyway. I might be wrong but the coil packs might be Mondeo V6? A friend drives a Cobra replica with a 383, I think yours sounds better...
Hi! Thanks for taking the time to comment!:) honestly I don’t know where the coil packs came from but I think you’re right having a quick peak at them so I’m guessing they’re not engine specific. That’s interesting to know that it sounds better than the 383!!!:))I’ve always been a fan of the V8 but I’m starting to like the v12 audio track!:)
Brilliant video and brilliant work...
Thank you Osca! Well happy with the end result having never done anything like this before! Glad you enjoyed it!
That's an amazing project!
Thanks Clive! Completely out of my depth to begin with but as it unfurled it gradually became clearer!
Now , thats a real engine😀 👍🏻
No p.o.s. umerrican veight !
Haha thank you!:)) pretty sexy engine:)
Great work, bet you're well chuffed
Yes well chuffed!:)
The factory Jaguar setup is quite complicated, the engine is much simpler with a different setup.
Yeah this way seems to be quite simple…
Sounds awesome good work
Thanks Michael!:)
that car must be wonderful to drive.
She is super smooth and loud when you want her to be…on tick over and idling she’s got a great little rumble!
That`s bloody engine. Good video
Ha thanks!!:))
Thanks for the info. Oh btw could you find out which brand TPS you got from Jenvey or Emerald.
Hi
The TPS was Jenvey dynamics but don’t have the brand. I’m guessing it’s their own brand as it comes with the TBs
Sorry couldn’t be more help there!
Please tell me that you didn't pull the Ford 427 out just to replace it with a Jag V12 pos that probably makes half the power, won't sound half as good and might be half as reliable. Still a super sweet and rare car.
Hahah!! Don’t worry Doug!! I know what should be in these!! This was bought as a cheap project and came with the V12! It’s actually a beautiful engine and now works brilliantly but yes V8 is what I wanted . Although I have a Pontiac with 400 v8 in it so that quenches my thirst for the rumble!! That v12 is making around 365bhp which isn’t too bad without upgrades
Wow, that sounds great!
Thank you! Yes I was well chuffed with it
love this crazy idea !! 🤩
Thanks! Crazy idea worked!!;))
Great film. I have an ambition to do an fuel injection conversion on a Ford Zephyr Six engine with a Raymond Mays 12 port head, so I'd be using 3x 40DCOE style throttle bodies. Did you consider using a distributor timed kit rather than a trigger wheel system?
Hi James! Thanks for comment!:) yes Jenvey dynamics do these engines alot! Honestly I don’t really know. I’m guessing it’s what you have already on there. I’ve actually just done a fuel injection conversion on a 67 pontiac and that has a distributor timed system and works great. The crank pulley wheel is a more accurate and reliable way I’m lead to believe but a bit more fiddly to install!
Nice Build!
Thanks Bob!:)
Most beautiful ride!
Thank you!! She is a pretty girl!:)
Sounds amazing
Thanks George! I’m well chuffed with it!
Makes a lot of sense, Webers are great but injection is a lot easier to set up. Is there any difference in throttle response? since that is always good with Webers compared to those terrible SUs the roadgoing sports cars used to run.
Hi! Yes the throttle response is off the charts compared to what it was but what it was before was really really bad. Webers are good just mine were very old and worn! Like me :)
Very cool man. New subscriber from southern AB, canada
Amazing thank you! I really appreciate people actually taking the time to watch and comment !:)
Are Rover 3.5/4.0 V8s popular with Cobra builders in GB? Here in the US it's just Fords or GB LS engines, good choices but some might consider them too powerful. Saner heads lean towards 300HP. A light V8 or even a 3.8l V6 would be plenty imho. I'm a fan of the Buick/Olds/Pontiac 215 ci engine, I actually had an Olds 215 that I was going to put into a Volvo P1800S back in the late '90s, never happened. Seems like the 3.5 with around 250hp would make for a good engine in a 289 FIA Cobra kit.
Yeah the rover V8s are popular (they were GMs right originally?) but England being all quaint and everything this was the largest engine that we could get our hands on for years so there’s loads of them about and cheap! £500. The v12 jag at the time was a massive step up but now we enter modern times where we’ve caught up and now have big engines. Im also a recent fan of BOP!! Having just bought a 67 Pontiac and loving it! I’m in the process of fitting a Holley sniper efi unit as it just wouldn’t start! (Carb was knackered!) I might do a video of that too!:)
First class video and what a lovely car.
Thank you Nigel! It was never really an intention to put this on UA-cam but thought it might be helpful to someone! People seem to like it! Admittedly that’s all the videos I’ve got!!:)
Looks like you know what you are talking about!
Thank you but i didnt know a thing about it when i first started! It was all learnt on the job so to speak!
Hi thanks for posting this video you don’t see a lot really for the jag v12, I have some questions I’ve had the same set up in a dax cobra I’ve sold the cobra minus the engine & I’m now installing that in a 1965 jag mk2 I’ve run the Weber’s for a few years although they have been reliable I feel the way you have gone it the only way forward for better drivability etc,
Would you mind sharing the cost involved with this conversation?
Also who provided the toothed ring you braised on for the sensor pick up?
I felt you must have been happy with the hp gain it sounded amazing I noticed your exhaust manifolds but have you had any more mods?
Lightened flywheel or cams?
Was there a problem with detonation on the rolling road was that fuel quality related? And did you rectify that?
What is the diff ratio & does it cruise relaxed? My cob was 2.88 I felt it was to long legged with the v12 & getrag 265 box.
How did you determine the length of the velocity stack or was it just because of bonnet restrictions?
Also do you have a cros section in your exhaust set up.
I’m sorry for all the questions but I’d be super grateful if you take the time to answer as it would help me tremendously!!
More videos please sir 😁
Hello Darren! Yeah you’re right when I first started this project there was no help on the internet or UA-cam so really had to do some head scratching. Oh wow so you had a dax with the V12! Did you like it? Since I changed to ITB it’s a different beast and way quicker and way more dangerous! Haha! Although I was coming from knackered down webers that had a massive flat spot between 1500 and 3000rpm which just made it unenjoyable to ride. So I’m gonna answer your questions in parts!
So yes it’s expensive annoyingly but hate to be defeated.
From Emerald came The ecu wiring , sensors, trigger wheel, 2 coil packs,bespoke loom,HT leads about £2K, (trigger wheel was £35). Got the open one and then lathed it out by 5mm to fit outside of the crank pulley and then braised. That cost me nothing as I did it. They can do the entire conversion (if you provide the throttle bodies)for £5K or if you fit the throttle bodies and the plumbing then roughly £3K. There’s a guy they know that charges £1K to fit the trigger wheel and meralli sensor (which I think was a bit steep!)Then the mapping which I think was £450
So now the cost of the ITBs from Jenvey dynamics which come in just under £4K
So the cost of you want to do all the work yourself which actually as it turned out wasn’t too bad and actually really enjoyed it… is roughly £6500 all in for parts and mapping. Mine was purchased about 2 years ago so might be a bit more north of that. If you’re going to get someone to do it it would probably be just shy of £9k i reckon! Crazy money!
Yes well happy with HP increase! It was crazy the amount! It pre detonated At 6000 rpm so still had 1000rpm to go which would of added on a other 20 ho to the map. The pre det was really just the age of the engine and they didn’t want to push it. It happens a lot on the rolling road and they were very professional and played it safe.
Yes so no more mods on the car.
The velocity stacks were limited by as you correctly said bonnet height. They recommended higher ones which would of been cool to stick em out the bonnet but like to keep things tidy!!:)
Sorry don’t know the diff ratio but cursing it is insane! 70 mph it’s 1500 rpm in 5th and something like 20-25 mpg and will pick up quickly all the way to 140mph. What you saw on the vid on the rolling road was that exact time from 60-140mph in 5th-impressive.
Sorry not too sure what you mean by cross section set up in the exhaust? Happy to answer more questions and hopefully that’s all you asked. If I missed anything let me know.
Keith and Dave at emerald we’re brilliant. They guided me all the way and the email thread between me and them was soooo long I’m surprised they kept answering me!! Haha
@@AlbydickBall wow actuali a lot of money.....i am in the midle of a revision of a overheaded engine main bearings look good ( replace them any way) head gasket not burnt throuh. only the smel off the oil tels a tail of overhead. i wand to keep the weber carbs ( are like new only did one race) gues the overheating was due to false air sucking , somewere around the carb. joints.... there were some bolds not tightend at al.... i was wondering aboud only changing the ignition to a coilpack....some advice would be apreciated
@@gerardharings9963 hi Gerard! Yes it does smell like you have a small overheating issue but these V12s do run hot and have a working temp of around 94 degrees C. I’m not a mechanic but more air coming in wouldnt neccesarily mean it will run hotter. If anything it will run lean. But an unregulated intake of air would make the engine run roughly and that would make it run hotter as it won’t be running efficiently.
Check your spark plugs. If they are fowled black then you’re running rich and running hotter.
Coil packs won’t work on your engine unless you have an ECU and I’m guessing you don’t seeing as you’re running carbs still. If you mean electronic ignition instead of the standard distributor ignition than yes that will make run a bit more efficiently and hence drop the running temp marginally.
As I said I’m not a pro and someone will correct me but that above is my experience!:)
@@AlbydickBall yes the sparkplugs they are fowled black....thanks for the quick response.....gues a finetune of the carbs wil sove the prob.....
@@gerardharings9963 no problem! Yes you seem to be running rich there
17:02 that near side throttle linkage is a r s about innit. The kink should be next to the throttle body.
And then miraculously at 19:00 its been resolved. Well done.
Haha!!:) yes it was a learning curve and had to go back and tweak things when I found out more info about the conversion! But good spot!:!! Many thanks
galloping,runnung a bit rich,check a few plugs often
Hi Jose, yes I think it was running rich but when I got it mapped I think they dealt with that problem (I hope!) I’ll check the plugs and see what they look like! Many thanks
AWSOME JOB
Thanks Mark!:)
Doing great mate , keep going whit vídeos like this ✌🏼
Cheers dude!:)) I’ll try and find something else to film!!
Most interesting, mine is similar venture to yours, except I made my throttle bodies by hand out of copper refrigeration pipe. See Share Jaguar V12 Engine on UA-cam. Thanks for uploading yours. 👍
Oh YOURE HIM!!! Yes yes I’ve seen this engine and it’s amazing!!! You are a true engineer and it looks crazy beautiful. I think Keith at M3D chatted about your car when I went up to Norfolk to get it mapped ! You’re is a full staircase ahead of what I’ve done keep!up the the great work!
I think most of your views came from my mates who pointed me in your direction. Love all the linkages and basically everything about it!:)
Just listen to it! Amazing motor.
Yeah thanks!!! You should hear it driving!!;))
Outstanding, definitely subscribing to this channel!
Great vid, would love to see more of this car as it progresses!
Cheers
That’s really kind of you! I’ll have to do some filming this summer! Also is Talkie Toaster a ref to red dwarf?:)
@@AlbydickBall You smegging bet it is!
@@TalkieToaster. haha smmmmmmmmeg heeeeeeeeeea!! I’m literally watching it now!!! Haha
@@AlbydickBall ha awesome, I just realised I'm also wearing my "Give Quiche a Chance" shirt lol.
I heard yesterday Grant and Naylor have finally stopped fighting over the Red Dwarf rights, so more Red Dwarf material is now planned!
@@TalkieToaster. no way! Best news today! I’ve yet to watch the promised land! For some reason it slipped by me! But I watched every episode over and over again when was younger!! ‘Come on krytron …WHAT IS IT?’ ‘It’s an off duty Czechoslovakian traffic warden’
That is simply sick… ❤❤❤
Haha! Thank you!!
love this video. why does your valve cover say daimler? the v12 is british with german valve covers?
Thanks for taking the time to view the video! Yup the engine originally came from a jaguar 1974 v12XJS Daimler (that was its model name) it was the luxury model!:)
Thanks
A Jaguar engine into an AC Cobra? THAT'S REVOLTING!!
Hahah I know! It wasn’t my first choice! A V8 is the only engine for these cars But it was so much cheaper and I thought why not! I already have 6.6L v8 67 Pontiac so a v12 would be a change! (Ha still can’t justify it though!!)
Great vid mate . . . thumbs up
Thanks Reuben I appreciate that!:)
Is the ignition system adapted from what some of the later 6 liters had? Thanks. Take care.
Hi Carl! Nope the ignition system is all brand new, the only part I used from the old car was the key and barrel!! I think that in the later versions you could use some of their stuff but probably best to replace everything as it will talk to engine better