Excellent video as usual. The first YT video about 'tuning' SU carbs I watched some years ago was very proud to tell us all how to turn the mixture screw, then go for a short test drive and bravo, done. This puts that video to shame, so thank you for putting us all on the right path!
Excellent AC with a detailed deep dive and just a quick thx for identifying my carb for me the other day - appreciate that M8!! As an FYI I could not agree more with you as I have an AFR gauge on my HS6 and a damn life saver for newbies like me - 😅 - Beat investment I ever made and folks listen as can save you a tin of time/headaches and money!!!
Hi, AC. Can't get enough of your knowledge - it's helped so much over the years. VERY interested to learn that a set of plugs could be knocked out like that; why could they not just be decently cleaned up and re-used??
Installed a wideband on your recommendation. Can you do a video of the display of one on the road so we can see what is normal fluctuations during normal driving? Cheers
Thank you for a very informative and explanatory video. Bore washing was explained and I really understood why my engine after rebuild in a short while has blow-by and needs another rebuild. You shall receive an enquiry in due time when engine is ready to be installed again. Keep that content mix as we really enjoyed it!
Thanks Adrian, informative as ever. I also came across a nice writeup you did on a forum some time ago, about which carb to use for which combination, and have since replaced the HIF38 on my modified 998 with a HIF44, Major improvement. Since I've started watching your videos I have fitted a high energy ignition system. AFR gauge and rebuilt the carb. Now almost across the entire range i have between 1 and 1.05 Lambda. Had a bit of richening up on trailing throttle, my guess it is up to having the wrong damper rod LZX1511 on a HIF44. Ordered the LZX2085 and it is on its way. Under acceleration it enriches to about 0.9 Lambda with 5w30 oil in the dashpot, no flat spots. Without the AFR Gauge it would have been guesswork at best.
Very informative video. Was interesting when you took the plug out after the run as the electrode looked quite pale. I was always told a "biscuit' brown colour was the correct setting
Great video. Like yourself I encounter so many cars running SU carbs where the resultant jet heights are a country mile away from where they should be. The 10 flats you refer to equates to around 0.06". Only the other month I came to a Cooper S, where the jets had been set at idle to approx 0.120" on one, and over 0.140" on the other, set to idle ATDC. He wasn't as lucky in terms of borewash, compared to the example you show. My digital borescope revealed that 99% of the cross hatching within the cylinders was gone, and it now had a mirror finish fit for a gillette shaving advert. At this stage not something that can be 'tuned out' to resolve, and not what an owner can easily accept hearing either. The engine builder now repairing the engine that the rings need replacing, as do other engine and box components. Sadly happens an awful lot!!
The worse one I have see is one jet set flush the second set in the full down position, contaminate oil, washed rings, £9k to have the entire engine and box rebuilt.
Hi A C ,are you able to supply fully reconditioned SUs via postal delivery. I have a 1098 moggy minor. Regards Frank 👍 And kept up the fantastic work 👏
Great stuff Ade. I think you get the level just about right for it being understandable even for people who aren’t very technical but also has those of us used to tuning engines (but not SU ones) nodding along at it being things we can relate to as well. It did slightly trigger me you using the term “lean” when you mean “stoich” but I understand why. People grasp rich and lean and introducing a third term is maybe going to confuse them. But when I hear lean I am thinking like 1.1 lambda not 1.0. Overall though. Fabulous stuff. ❤
I’ve noticed last time I took the car out it was poor on response. Can the oil in the carb affect it? Ie cold so the oil stays thicker for longer. Good vlog always enjoy these 🎉
Hi AC, I dropped my Mini off last weekend to Andy at M L Motorsport for an engine and box rebuild (the black one on 13’s you looked at on his August tuning day). I’ve asked him to install a boss for the wideband gauge, but looking at the kits that are available (gauge, wiring and sensor) prices vary quite considerably. Have you seen much difference in their accuracy across the board? Any recommendations would be appreciated.
Thanks AC, help me in this please. On other videos (I think) you said turning the mixture screw only changed the mixture at idle and the needle profile controlled it throughout the rev range. Have I picked that up wrong?
@@MiniMattTV I get what he said on other videos and took it on board, but the diagram on the whiteboard shows that adding flats enriches the mixture up to peak load, so am confused
*up to peak, where all paths meet, diminishing as it travels, not including peak obviously. It shows enrichment right through the rev range if the mixture screw is adjusted. Am just a bit baffled now
@@GPZ_Bikeryour all missing the point, if your needle was too lean to start with you would have to turn the mixture screw so far that most of the driving range you would be bore washing the cylinders, is the point I was trying to make.
Question: You mentioned that a 3 ohm coil is too low powered for a 1275S, so can you suggest what coil should be used if the 23d4 distributor has a Accuspark conversion fitted and what the spark plug gap should be?
Question for Mr Dodd: if my dwell angle is low, but my points gap is per the book, should I just carry on? What I mean is, should I trust the gap or the dwell angle? The engine runs really nice.
Some aftermarket dizzies do not produce the correct dwell reading with the factory points gap. You can drop the gap a little to increase the dwell. It’s the dwell angle that is the important measurement.
Yes, but faster to change the plugs, and I was right, the look of the plugs and the sound told me the problem and I did not need to perform a compression test.
Brilliant stuff! I would love to know more about the effect of springs and damper on fuelling. Thanks.
Excellent video as usual. The first YT video about 'tuning' SU carbs I watched some years ago was very proud to tell us all how to turn the mixture screw, then go for a short test drive and bravo, done. This puts that video to shame, so thank you for putting us all on the right path!
The screw turners have no idea how the carb actually works.
Excellent AC with a detailed deep dive and just a quick thx for identifying my carb for me the other day - appreciate that M8!! As an FYI I could not agree more with you as I have an AFR gauge on my HS6 and a damn life saver for newbies like me - 😅 - Beat investment I ever made and folks listen as can save you a tin of time/headaches and money!!!
Fantastic tuition learnt alot thank you
All episodes are great but this was something else! Thanks for your time and effort.
Great video AC, enjoy all of yours and Darren’s content 👍🏻
Thanks for the feedback!
Informative Video as always A.C. I like the "Deep Dive" Edition & would like to see more of this in future.
Thank you.!
loved the deep dive! keep it up mate
Hi, AC. Can't get enough of your knowledge - it's helped so much over the years. VERY interested to learn that a set of plugs could be knocked out like that; why could they not just be decently cleaned up and re-used??
They could, but they needed a blowtorch. Faster to fit new ones
Enjoyed the more tech video style. Please keep them coming..
Great interesting and informative video as always , every days a learning day with AC , and he keeps it interesting
Thanks AC! Very informative as usual
very informative . now i understand more about the mixture screw. the graf helped.
Awesome,that was a beauty 👍
Love the deep dives! keep them coming :)
👍🚘 Always something to learn from an AC Dodd video. 👍
10 Flats WOW
That's like 1.6mm
Very informative video. Good to see the colour of the plugs and explained in depth 👍
I so wish you had been around doing UA-cam when I had my Minis. I've learned so much, thanks.
Installed a wideband on your recommendation. Can you do a video of the display of one on the road so we can see what is normal fluctuations during normal driving? Cheers
I will get one uploaded next time I take the mini out for you 👌🏻
@@MiniMattTV yes please have subscribed to your account
Thank you for a very informative and explanatory video. Bore washing was explained and I really understood why my engine after rebuild in a short while has blow-by and needs another rebuild. You shall receive an enquiry in due time when engine is ready to be installed again. Keep that content mix as we really enjoyed it!
Glad it helped
Excellent information and clearly presented. Thanks.
I've been working on BL products for a VERY long time and I learn something new from all of your videos.Thank you very much!
Great to hear!
nicely done A.C.! I always learn something new from watching your videos - now if I can just remember it all! Hah ha. Thanks for sharing.
Thanks Adrian, informative as ever. I also came across a nice writeup you did on a forum some time ago, about which carb to use for which combination, and have since replaced the HIF38 on my modified 998 with a HIF44, Major improvement. Since I've started watching your videos I have fitted a high energy ignition system. AFR gauge and rebuilt the carb. Now almost across the entire range i have between 1 and 1.05 Lambda. Had a bit of richening up on trailing throttle, my guess it is up to having the wrong damper rod LZX1511 on a HIF44. Ordered the LZX2085 and it is on its way. Under acceleration it enriches to about 0.9 Lambda with 5w30 oil in the dashpot, no flat spots. Without the AFR Gauge it would have been guesswork at best.
Good effort to get it there, make sure you get a sustained 0.85 at full power
Excellent video as always, I think the deep dive style is great.
Great information as always. I have a nice little video showing installation of a wideband gauge for anyone interested. A well worthwhile addition.
Post a link
@@ACDodd sure 👌🏻 ua-cam.com/video/YhMlw5tLbwk/v-deo.htmlsi=Xd7J3ahrE3SEVbMt
Very informative video. Was interesting when you took the plug out after the run as the electrode looked quite pale. I was always told a "biscuit' brown colour was the correct setting
That’s the point, what you was told years ago is now different, as the fuel we have is different. You have to keep up with changes as they happen.
I like this deep dive style video 👍
I remember years ago you told me this after a tune up at ML! I had them rebuilt straight away. I'm currently about to put on a Reece fish 😂
Better than your usual videos!
Great video. Like yourself I encounter so many cars running SU carbs where the resultant jet heights are a country mile away from where they should be. The 10 flats you refer to equates to around 0.06". Only the other month I came to a Cooper S, where the jets had been set at idle to approx 0.120" on one, and over 0.140" on the other, set to idle ATDC. He wasn't as lucky in terms of borewash, compared to the example you show. My digital borescope revealed that 99% of the cross hatching within the cylinders was gone, and it now had a mirror finish fit for a gillette shaving advert. At this stage not something that can be 'tuned out' to resolve, and not what an owner can easily accept hearing either. The engine builder now repairing the engine that the rings need replacing, as do other engine and box components. Sadly happens an awful lot!!
The worse one I have see is one jet set flush the second set in the full down position, contaminate oil, washed rings, £9k to have the entire engine and box rebuilt.
Thanks so much, I do understand now
"Please, sir, I want some more."
Hi A C ,are you able to supply fully reconditioned SUs via postal delivery.
I have a 1098 moggy minor.
Regards Frank 👍
And kept up the fantastic work 👏
Yes.
Yet another great video, thanks 😊 Any broadband setup you would recommend? I’ve rebuilt my twin HS2, so need to get this right.
Either innovate or AEM that use a genuine Bosch sensor is ideal
Thanks 👍
Great stuff Ade.
I think you get the level just about right for it being understandable even for people who aren’t very technical but also has those of us used to tuning engines (but not SU ones) nodding along at it being things we can relate to as well.
It did slightly trigger me you using the term “lean” when you mean “stoich” but I understand why. People grasp rich and lean and introducing a third term is maybe going to confuse them. But when I hear lean I am thinking like 1.1 lambda not 1.0.
Overall though. Fabulous stuff. ❤
Crystal clear Mr D, I assume this would be the same for Stromberg Carbs?
Yes it would be
I’ve noticed last time I took the car out it was poor on response. Can the oil in the carb affect it? Ie cold so the oil stays thicker for longer. Good vlog always enjoy these 🎉
Yes temperature changes will affect the SU’s calibration.
Lobe grease. Things kids today will never understand.
Hi AC, I dropped my Mini off last weekend to Andy at M L Motorsport for an engine and box rebuild (the black one on 13’s you looked at on his August tuning day). I’ve asked him to install a boss for the wideband gauge, but looking at the kits that are available (gauge, wiring and sensor) prices vary quite considerably. Have you seen much difference in their accuracy across the board? Any recommendations would be appreciated.
I recommend those sold by innovate
Thanks AC, help me in this please. On other videos (I think) you said turning the mixture screw only changed the mixture at idle and the needle profile controlled it throughout the rev range.
Have I picked that up wrong?
Correct
@@MiniMattTV I get what he said on other videos and took it on board, but the diagram on the whiteboard shows that adding flats enriches the mixture up to peak load, so am confused
*up to peak, where all paths meet, diminishing as it travels, not including peak obviously.
It shows enrichment right through the rev range if the mixture screw is adjusted. Am just a bit baffled now
@@GPZ_Bikeryour all missing the point, if your needle was too lean to start with you would have to turn the mixture screw so far that most of the driving range you would be bore washing the cylinders, is the point I was trying to make.
Thoughts on CSI ignitions advance curves? Are they too slow for modern fuels?
I don’t comment on other peoples kit. I just supply my own units curved using 30years of experience.
Question: You mentioned that a 3 ohm coil is too low powered for a 1275S, so can you suggest what coil should be used if the 23d4 distributor has a Accuspark conversion fitted and what the spark plug gap should be?
Listen to the video again, the car has a 3.3ohm coil, that’s quite low power. A typical gold coil of 2.5ohms would have been better.
Plug gap 0.025”
Thanks for your help - great tuition learnt from this video. Keep similar coming
Thanks for your help - great tuition learnt from this video. Keep similar coming
Question for Mr Dodd: if my dwell angle is low, but my points gap is per the book, should I just carry on? What I mean is, should I trust the gap or the dwell angle? The engine runs really nice.
Some aftermarket dizzies do not produce the correct dwell reading with the factory points gap. You can drop the gap a little to increase the dwell. It’s the dwell angle that is the important measurement.
Ok thanks! 👍
Can't you clean plug anymore
These needed blowtorching, much faster to fit a known good set and tune from a known baseline.
Just do a compression test
Yes, but faster to change the plugs, and I was right, the look of the plugs and the sound told me the problem and I did not need to perform a compression test.
cheers AC brill vid ,can we have more please
'Please, sir, I want some more.'