First-Ever Variable Valve Timing Direct-Injected 8.1L Engine Unveiled
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- Опубліковано 25 бер 2024
- Today we're going to get into some of that detail and Larry Hofer will explain how he's has designed and engineered these one-of-a-kind components for his 8.1 liter direct injection cylinder heads and how he incorporated variable valve timing onto a GM Big Block. The previous video introduced how Larry is converting his new C8 Corvette to a Big block 8.1L powerplant.
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50 years ago I'd be reading about this in Hot Rod magazine ,where lots of innovative things appeared each month. ,not watching it on a PC. 😁😁
Brian Lohnes has lots of vintage / old time research from the day
lol today the "brains" at hot rod dont think a car like this is worth looking at.
Great how technology works 😅
@@samstewart4807 Yeah thats why they went quarterly.
I just threw out all my street machine mags, etc, from the 80,s . Magazines were the original internet for getting info . Cheers
Do more on this engine conversion please, this is incredibly insightful.
Don Taylor is a badass, more of him please!
YES!!!
Don Taylor is a good friend of Larry. I believe they wrote several books back in the day.
I really don't understand why this channel doesn't have more subscribers,this is top-notch stuff
I can’t figure it out either. I’m thinking it’s because this content is very specific and unique to a small audience of people who understand internal combustion engines and have and appreciation for automotive ingenuity.
@@GregQuirin thanks, im working slowly ( career/$$ is my limiting factor for now not talent, also great to see my ideas that are similar to videos is working as necessary as i started my engine rebuild/mod's around March~ 2020 ) on the dodge conversion version for 440/or/hemi's using gm phasers and 5th-gen vipers cam-in-cam ( my head's are D-8's aka modern iron recasting's and the DI-injection is off a BMW/eco-diesel as the part-number crossover or so my research says so and they fit better than the LSX/LT unit's do between my twin-plugs and CNP/COP ) so im interested in seeing it run ( hope it's good on MPG's etc as i just can't bring myself to platform swap/2006+up engine and or LSX/coyote/3d-gen/k-swap but looking forward to advance's that have-come, and yes my transmission is a TR6060-platform etc ) and how to and pro's-vs-con's, my ECU/computer doesn't need to be a GM/OEM as legally/EPA 🇺🇸 i can do stand a lone for my 60's charger plus my tag's/state doesn't do OBD2-testing for pre-2002~ vin's and or won't-count sadly as it would be faster to testing/less-hassles and or volunteer for classics/20+ years-old's
There is being a mechanic and there is being an egineer. This guy is an engineer!
Just got off the phone with Larry talking about my 2 boat motors that he built. Crazy he spent a half an hour chatting about options for freshening up. Trying to meet up in Havasu for desert storm
That’s awesome! Larry is a nice guys!
I always was an LS guy, but more and more I become a big block fan.
Cant wait to see the C8 big block! So wild to see the custom head work.
Thats Larry Hofer, owner of the Corvette Shop in San Diego - cutting edge stuff these guys are doing if they cast and machine their own heads! These guys are wicked-smart!
That blower with the GM logo looks robbed straight off an old Detroit diesel. Very cool that they even made that stuff.
Bro…your inner circle is First Class OG horsepower junkies
I am 35 years old my first car was a 1969 Camaro it was 38 when I was 16 and you documenting these legends and their engineophile innovations is very much appreciated.
Your welcome!
Awesome work, always wondered when someone would go direct injection on a big block, can’t wait to see more on this!
Anytime i watch these the amount of knowledge in everyones head absolutely blows my mind. To be around these dudes doing/learning the things they do is probably the best job in the world
MORE OF THIS! I don't understand why so many Chevy/GM guys delete VVT and/or DI instead of integrating it properly into a build. There's SO much power to be found!
because most guys just throw in an aggressive top end cam? They're not looking for low end and driveability. Very simple
@@THESLlCK it goes far beyond that. With a properly equipped VVT cam, you can make more power EVERYWHERE. And everybody wants that.
@@spdcrzy no, not everybody wants that, very clearly.
@@THESLlCK they're lazy. -_- Nobody seems to want to do max effort N/A motors anymore that actually have to be engineered properly.
@@spdcrzy what?? No dude, NA motors never had it better. theres 1000hp small blocks on the street now man. VVT isn't useful for a max efffort race car lol, which this is not
I love guys like this.He has a deep understanding beyond the average tech nerd. I really enjoyed the posting.
This is what happens when old school gear head meets a DoD budget! LOL Incredible!
On a whole different level. In a whole different solar system. Mind blowing and amazing.
I know, right? Some pretty cool stuff happening at a couple different shops here in San Diego.
Mercury Marine 496 HO UPGRADE!!!! Hell yes!!!!
I would have loved to have this gentleman as my teacher.
Absolutely love this. I feel bad for the people who don’t get Big Blocks. I’m just here to let ya’ll know “I get it.” Looking forward what’s next for this incredible build.
I'm sure this guy has plenty of money. But still not above using a shopping cart to hold a Big Block research engine.
Love the ingenuity.
Keep up the good videos.
Yep, that’s because Larry ends up with abandoned shopping carts in the alley so he makes good use of them!
Great piece, thanks. When Don is expounding please try not to interrupt.
wow this is so awesome, look forward to the next video of the 8.1 C8
Coming soon!
I love when people think outside the box. I also love when they put it into practice
This dude is legendary! So glad I found your channel!
Welcome aboard! Thank you for subscribing
Thank Larry and thank you for your time and this video. I just love this type of content.
That guy is a damn genius... That is some slick ingenuity!! I have an 8.1 in a Suburban I want to save and build when the truck goes to ShIte from rust in time.... This is some exciting stuff to ponder
Looking forward to the next episode. Thanks.
Can't wait for the next video where it all goes together. Thanks Greg for these great videos from these great guys!
👍💪✌
Glad you like them! Thank you
The 2 things everyone deletes when they build a modern engine. This guy said nope, he loves it, and wanted to add it to a engine without it.
Simply amazing 🎉. Please stay with this until the end 🙏
Very interesting indeed, please continue Greg, Thanks
Mind blowing what he’s doing
my goodness more incredible car stuff ur channel should have thousands and thousannds more subs truly 1 of the best channels ever thank you for sharing all this auto honey with us out here
Wow, thanks! I wish I had more subscribers and viewers. I just don’t think I’m hitting the UA-cam algorithm frequently enough to attract more subscribers.
This is so cool! Keep em’ coming!
Thanks! Will do!
Great stuff again Greg! Thanks!! 👍👍
My pleasure! Glad you are enjoying it!
This video seemed to go by in about two minutes when you said “well this is it for this video” I was stunned it was over so fast! Please video assembly of the 8.1 I love this stuff and the 62 Corvette is beautiful I’m one year older than it. Thanks for the video.
Glad you enjoyed it!
im loving this series
Thank you
All supercool, thanks!
It would be nice to mention that, the gear on the back is used normally to drive a stub gear that not only completes the oil circuit on that side of the motor but also drives the standard wet sump oil pump.
I would love to hang out with him and nerd out on this build.
Love it , great content. Thank you !!!!
Great content well done
Direct injection big block ❤
This is awesome brother!!!
Big Block Vtech...now this guy has me wondering what it would be like to have a high revving, high comp big block with those cam phasers on.
I’m still absolutely loving this DI big block build I’ve been wanting to see someone with the know how to do it and it looks like I’m in luck.
great content
Reminds me of Thunder Power BB 4 valve pushrod heads from the 90’s.
Amazing!
Awesome Sauce
I always thought GM would put more RD on the 8.1. Then, trying to get so much out of the 6.0 or 6.2.
Like ford with the godzilla motor.
If his traditional 8.1’s make 525, I wonder what this version will make.
Imagine making 100 hp per liter on one of these
What a man
I remember reading about Mickey Thompson doing this to a small Chevy in the 60's
The 8-1, looks alot like a LS anyway. I'm surprised no one is using the truck engines more, the 6.6 or what ever, the gas option for 1 ton and maybe a bit larger trucks , not that familiar. I wish they would build a basically big block LS, a wider bore spacing, taller deck height, possibly a 1" taller deck a spacing to allow 4.250-4.560 bore and 4.300-4.750 stroke up to 604cid with direct injection and port injection, use the port injection for cold start enrichment. And full throttle high rpm. Build a SS-3500 with a big supercharger 10 speed transmission, 604 CID. 20" aluminum rims built to haul and pull toy trailers. Basically a ss454/typhoon style modern truck in dually and single. Making 855TQ and 760hp on 89 octane , and on E85 and the 😮WOW! Tune 990tq, 1100hp stock with tune and exhaust upgrade, and blower pulley, with factory dual 3.5" or 5" single single , stock exhaust. This would be an awesome truck no one could afford, it could also be a hybrid, with a 80-120kw motor in a transfer case like gear box on the transmission, or on the transfer case in 4x4 trucks with a 60 kwh battery between frame rails. With plug in charger and re gen and charge as driving , .5%-15% of the power goes to charging driver set> and Regen or when the brakes are tapped the Regen starts even when driving non ev. Also the motor and engine work together for just under 2000 TQ, about 1400 HP, with optional additional over/under drive in the transfer case, to get roughly 50% reduction and 20% additional over drive, of shift from 1:1 to +.20:1while driving just like a gear change , or change in each gear, making a 10 speed into a 20 speed, or just a 11speed. The 20 ratios works best during slow acceleration. Allow full speed good economy, with smooth gear changes. Similar to a variable ratio or CVT transmission, this is something gm should build! In 4500 also with pickup bed and 4-door . Sorry to dream and ramble!!
He is a brilliant man i seen other things he did. Not sure if it was you who posted it or not thow
Wow. Thanks.
Great and interesting
When I grow up I won't to be just like this man this is the stuff I love eat breath live for I just love it R & D it's so fascinating for me!!
This is seriously fascinating stuff! I'd love to hear why start with an 8.1 and not the PSI 8.8?
LT engines have unique chambers and top of piston shape, I wonder if that was resembled.?
nice, thanks for making these (not a spam underpants thanks but a real one)
Awesome. Direct injection will probably add 50hp at least if compression is bumped up.
I always wanted to see this done to a gen 1 small block
Back in the '90s, if my memory serves me correctly, there was a company called Magnum Industries (I think) that developed 4 valve heads for small and big block Chevy. They were working on small block Ford and small block Chrysler. They of course used 4 valves per cylinder with 1 heavy duty pushrod and a split rocker arm. Diesels do it this way. Not sure what happened to them. It would seem a 4 valve head would be easier to fit direct injection to
Thanks
It's beyond me why GM didn't put direct injection on the 8.1 and continue using it for the hd trucks instead of the 6.0 or the 6.6 (gas).
It was not meeting cafe standard variable cam timing and dod on ls/lt allowed smaller engines to make more efficient power with technology to meet cafe standards
Greg, I have an idea for you. You mentioned you were off this week. I'm going to assume that to mean this week but I don't know when this was recorded. If Larry would be up for it I would love a live question and answer session. I would love to ask questions about the process of designing and having my own castings made. I understand that he is probably very busy and doesn't have time to sit around. However if these type of people don't share their knowledge to other generations it will die with them and eventually so will the car culture/hobby. I have a lot of respect for the men that you video and want to say thank you for taking the time to do so.
VCT is amazing....
badass
Cool
big block direct.. very deserving. I am curious of durability on that heat angle. I like the gm history. I still run a spider injected truck as if it was a modern marvel. It did everything I had guessed it would back in 1996. The first injection swap..390k miles, at 26 years. and it was my fault I broke it.
wow
Did you figure out how to make a DUHC kit, yet?
so it could have one intake cam & one exhaust cam, with independent timing adjustment
They did it this way to stay in contact with stock computer now that global b can tune c8 I would have deleted direct injection or had both like the zl1 or 18 up mustang gt port with direct
Do you have flow numbers?
Let him do the talking
Yeah, he's a bit interruptive and is obviously leagues less knowledgeable. I couldn't believe it when he asked about a solenoid for the oil feed off the camshaft and was shocked that fuel pumping could be accomplished mechanically.
👍
What are the HP/Torque numbers. "Yes"
The 8.1 uses the same 18726543 firing order as the LS/LT engines. Do you maintain the same firing order or go back to 18436572?
Where did you get the table top manifold? Would you be interested in selling it? It seems to be low profile to fit my 7.4L BBC in my stock hood 3rd gen Camaro.
Mechanical variable valve timingThat's run by carburetor with no computers you might want to consider that anyway great video
Is the block Iron or Aluminum?
Iron.
"boat anchor"
OK, the comment boat anchor doesn't apply here.
yep, it is iron but of a newer GM thin wall casting technique. The older style Gen,4,5,6 used an older style casting process. this block is only 80LBs heavier than an LS block, but overall, the engine and heads are still about 200 LBS heavier, but all in the right place, no traction problem and tons of torque. the reason for keeping the cubic inches at 496 is the clutch. I have made 588 CI short Blocks
, but didn't want that much torque. going to work with higher RPM's. Good breathing heads and intake. we will see how well the variable cam timing works. Stay tuned.
did leave the big block with the stock cam and the stock injectors? if you did , this comparison is flawed.
Meanwhile my dumbass is over here with a Dremel trying to guesstimate a port and polish without any idea what volumetric efficiency and port matching is lol
I wish you had posted a direct link to buy his book
Here you go I would check Amazon as well www.americanbookwarehouse.com/4536363/
Go on Google, amazon or Car-tech. they all have it.
@@GregQuirin i bought the book and posted the link
What's the point in the mechanical pump lobe when you are running efi? Since there isn't any mechanical pump that puts out 58psi.
Common rail high pressure direct injection is close to 3000psi at the injector - the lift pump in the tank will be around 40-50psi Also standard fuel injectors have 13-14 Ohms where as these high pressure injectors are at 1.5 Ohms. It’s a different animal! The cam lobe drives the high pressure pump which is in the valley under the intake manifold.
Do you not know what direct injection is ?
@@GregQuirin thanks for the info. I'm still trying to learn everything an didn't know that.
@@jkfonyi I understand what it is but not how it works
Is thet emeila hartfords camaro I see
No one will ever see this but can I get a blueprint / spec sheet for the dimensions use for the injector bung?
Hi what do you mean by injector bung
The cutter dimensions, i can send you those.
@@larryhofer2266 if you can send me the dimensions that would be awesome, my contact email is in my channels details at the bottom.
You made big deck engine from perfect big deck man I like it really
How much cost like this engine???
never liked direct injection = fuel flow cleans up ports and adds a cooling affect on valve gear ! = just look at the dirt on street direct injectors ! = great for planes and flying upside down ! but take a lot more to change my mind on this !
mustang gt got both after 18+ 16 injectors
is the book available as a free e-book
I need to buy that tool, could you guys let me know who you got it from, ill buy it from you if need be
I had it made here in San Diego. I will see if i can find the info.. has been two years since i had it made..
@@larryhofer2266 you the MVP. I very much appreciate it
Using the injectors to cool the air on the blower 'vette,.... Just like a carbed turbo. Nice!
When he says 'computer', is he talking a Factory ECM? If this thing works, should we expect GM to copy it? 😂
NA, a big block C8 is going to be like driving the big GT-40 back in the '60's. Add some boost, you'll be hunting Veyron's at 1/10th the price!!!
Even with the LT small block and some turbos, you’ll be hunting Veyrons on a budget.
I certainly appreciate the engineering and fabrication skills on display.But it seems like a waste when you could just beef up and twin turbo the stock motor
Seems like alot of time and money for 30 hp (495 to 525),
GM designed the gen V heads *around* the DI system. I don't think retrofitting the BBC is a great idea. Don't forget the catch can! The 8100 is notorious for a bad PCV system.
Thanks for the video Greg but maybe a little steadier with the camera and not bouncing around so much it makes me a little seasick