GEN 7, 8.1L BBC INTAKE TEST! HOW TO SWAP A MODIFIED INTAKE AND MAKE MORE POWER WITH YOUR 8.1L BBC!
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- Опубліковано 6 кві 2023
- HOW MUCH POWER IS AN INTAKE SWAP WORTH ON AN 8.1L GEN-7 BBC? WILL THE RIGHT INTAKE ADD POWER? HOW TO SWAP 8.1L INTAKE MANIFOLDS! WILL A PORTED INTAKE ADD POWER? HOW DO I INCREASE THE POWER OUTPUT OF MY 8.1L? HOW TO MAKE MORE TOWING POWER WITH YOUR 8.1L! CHECK OUT THIS TEST ON HOW MUCH POWER A MODIFIED FACTORY INTAKE WAS WORTH ON AN 8.1L BB CHEVY. I RAN A BACK TO BACK TEST COMPARING THE STOCK 8.1L INTAKE AND THROTTLE BODY WITH A MODIFIED VERSION FROM AMOS GARCIA (FAMOUS AMOS).
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On behalf of 8.1 fans everywhere, I just wanna say thanks!
I'm trying to rebuild her put back on the road and 05 Sierra that only has 120,000 miles on it that's at for the last seven years and I'm bringing it back to life and has raylar cam BP 203 at the moment. With the very basic TuneIn trying to find the best options
More aftermarket support for the 8.1!!!😮
Im ecstatic the 8.1 is finally getting more attention
We really need to see the new Raylar intake on there with a 102mm throttle body. Im thinking of buying one but would rather see real world unbiased dyno results before plunking down $1300 for an intake that should be $500.
Richard is the coolest guy I don't know...
Been waiting for this!!!!!!
Awesome, Richard!
Thank you for doing this!!!!
Thank you Richard!
Can't wait to see part 3
Richard your making me regret selling my 8.1 lol
I wish I had seen this sooner…before buying a diesel for the Loadstar “Make-over”. Thanks for all you do!!🇺🇸🏁🏁
It's super cool this is a dry intake. I hope you do a tubular setup on this, I salivated over the idea of doing it to my Pontiac 350 when I had it. (I cut the water neck off.)
shout outs to Amos for the intake mods and engine.
Like the sweater shout out from Colorado
Thank you for all of this. I have a 8.1 in a rcsb 1/2 ton that will be built soon.
Thanks for all the testing Richard.
Raylar engineering makes a aftermarket aluminum head & intake manifold it would be nice to see that with the 502 camshaft though chances of getting a aftermarket donor head pretty slim.
Nice steady smooth gains across the board. The old man dropped his portable tool box off for me to do some work on this weekend. Can you say "Sawzall Engaged''? I know I can! Thanks Richard!
Yup I'm getting one definitely
Richard is the man!! Gen 7 power!!
Them are some big gains modifying a intake wow!
Richard,
This was a great test. I really want to see a SuperRitchey Fabrication stock LS3 Manifold with a 102 MM opening and TB.
It would be super cool to see a tunnel ram on one of those!!
That is a mountain of torque!
Great video Richard THANKS !!! Maybe I missed it but what were those springs you used ?
Great numbers. An old boss had a 3500 regular cab dually with an 8.1 and 6 speed in it and that thing would pull a house down
THATS SOME AWESOME TORQUE
Your 8.1 videos are making me hang onto my rusty bodied 01 Avalanche 2500 for perhaps another upcoming brutal Minnesota winter. And, what if I need that pulling power to yank out a barge stuck in the Mississippi river? LOL The amazing thing is after I replaced the rear main seal, it hasn't lost a drop of oil nor does it have any coolant leaks...I thought for sure I'd be an oil sucker at it's mileage.
That looks like a good one to test 8 Mikuni Super BNs on.
Hey Rich great video as always. Is there a way that you could make a connection so I could find this intake. I would much rather try this then the Raylar, much appreciated
Beast of an engine. Needs a 101 or 102 lsa cam
Famous Amos......love his chocolate chip cookies
Another nice video Richard.
What you have done so far would make a killer engine for a tow vehicle.
I think that both that camshaft, and that relatively mildly modified intake are really holding the power back.
Throw on a set of Yella Terra YT6318 rockers, you'll need a set of semi trick metric socket head cap screws. And then the correct 7/16" pushrod, at least 0.125" wall 4130.
It really wants a Comp XM284HR cam, but you have to be super careful about piston to valve clearance, it may need the YT6317 1.7:1 rocker. Billy Godbold told me it could actually be ground on their Gen VII core.
Depends on how heavy a RV you're towing. I had a 2001 Silverado 3500 8.1 and changed cam to high torque and modified intake all from Raylar Engineering. Towing 14,000 lbs there was a noticeble drop in low-end power/torque. I also dropped gearing from 4.10 to 4.56 gears and ran shorty headers. I would only recommend doing the mods if your tow weight is 8,000 lbs, or less
WHY WOULD WE WANT .125 WALL 7/16THS PUSHRODS? BUT ROLLER ROCKERS ARE ON THE LIST
Awesome video, I love your regular videos but can’t sit here for an hour watching your live streamed videos who has time for that lol
THEN DON'T WATCH THE LIVE FEEDS-PLENTY OF OTHER 10-15 MIN VIDS
Yup been doing that from day one, keep’em coming!
Turbo 8.1 torque monster some guys are doing well with them
Sweet
Is there a plan to take the stock heads off and excavate them to flow more? I sure hope so.
More more!!!😊
Also rich is this guy Amos available to do an intake. If I sent it to him. Or just bought a stock one online and sent it to him. Along with that debating or could use some input on which is the best throttle body to use and then leaning towards a jet mass air with the SNB closed air filter setup
If you were dead set trying to squeeze everything outta the factory form....I'd extrude hone the manifold next, testing individual runner cfm before and after
The exact same mods were used by Aussie Holden efi 5.0L guys, when chasing power using the factory intake.
Known as 'the bunch of bananas manifold' it had horrible distribution and runner flow due to the rough/bad internal castings.
After throttle body mods....extrude honing, including port/gasket matching the manifold saw significant gains.
The modded intake reminds me of Q-bert. 😛
That said, the power increase is nothing to sneeze at.
You just dated yourself. But ya you’re right.
Looking forward to more Gen7 8.1 knowledge in part 3.
For this modified intake, thoughts on how streetability is effected VS stock intake?
Looking at the test the torque or power curve are unchanged So streetability is unchanged.
It probably makes more induction noise due to baffle removal. That would be all
It'd a bunch of work for 20hp, but I like the effort!
@@daytradescottie7253 ya I know. I love turbos
Stick a velocity stack on it and a set of headers with collectors tuned/cut at the hottest spot and see if it picks up some power up top
hot spot is not the ideal spot
I drove a lot of trucks with these vortec8100 engines but honestly the v10 dodges would out pull them. Probably because they are up 150ftlbs at 3000rpm where they would normally run driving.
Yeah but then you’re having to deal with a Chrysler engine and transmission. Nty.
You nailed it. The runner length should have been shortened. That intake would be perfect on a truck though.
the motor is use in a truck and motor home and boat
@@richardholdener1727 Keep up the great work!
Long runner with turbo or twin turbo, as LT with big turbo got 800 hp, and i think it was 900flb , and as Shelby said to Enzo " fist you need the torque to talk the talk "
I’ve always thought that 3D printers were a boondoggle for most of us, but watching this video made me think. Could this be a fun project for someone to try and make an intake manifold? Unfortunately I don’t have an 8.1 or a 3D printer. Maybe an excuse to get one of each. 🤪
No 8.1L here but I've been thinking about the same for another project. It'd be interesting to print each runner then have it glue/screw to a piece of 6" PVC pipe for a plenum.
Maybe extrude honing can alter the runners for more power? Cool testing Mr. Holdener 💪
I was thinking exact same thing!
Acid flow porting like class racers used to do to cheat would be interesting to see what gains could be had
I have an 02 silverado with the 8.1 . I paid Raylar a lot of money to modify the intake, I've noticed zero difference in performance. I also have SS long tube headers, tune and Volant true cold air intake.
Can you go onto detail on the drive by wire to cable conversion? Or was it doable only because of the aftermarket ecu??
I only test-no swaps
Please for the love of God do a 400-500 horsepower build on an olds 350. i have a 71-72 # 395558 Block/non-windowed main webs and i need ideas. PLEEEASE.
Nobody ever does anything with an Olds 350. A 374 stroker would be a good idea.
You can use a diesel 350 block and take it out to 440 cu. in. Cool, huh? A 440 inch small block!
What about compression? Is it there enough?
Weird how the 8.1s were so ignore for 20 years...now lots of stuff coming out.
While some people used Thema and toyed with them..so many overlooked them as junk. For so long
What up Rich
I'd love to see a single or twin Gt45 setup on an 8.1, considering how well these motors respond to boost, dirt cheap ebay boost doesn't sound like a bad idea.
Look up Lawrence Tolman on UA-cam. He's be messing with a Turbo 8.1 for over a year. I think it's over 1000 ft-lb and 800hp now.
I ALREADY RAN THIS MOTOR WITH A TURBO
@@richardholdener1727 I was interested to see a twin turbo setup. I haven't seen one done, and whether a single gt45 would be a restriction with the 8.1 considering it is slightly smaller than the s475 you ran.
@@richardholdener1727 Sorry I missed that- there have been "other distractions" of late- I shouldn't let them get in the way of my hobbies!
Awesome run with one of my all time favorite engines- been a "big block chebbyboi" since the '60s! A question or two; who was the fabricator who welded the manifold- that was good work, not as pretty as I might want, but the lack of warpage, the full vacuum seal says he knew his biz! Next, why was the manifold entry below the throttle plate left so rough? I would have thought that turbulence wouldn't help things at that point. But I just push em' till they either don't go fast or litter the landscape with parts of parts- your channel has begun to "lift my eyes to a higher plane"as it were. Will you be single/double boosting, S/C or other with this combo ?
I fabricated it for free so was done as fast as I could, still took 5 hours. It was done just for a test not for purty so was no need to spend extra time marking it look good.
@@amospgarcia9152 Sorry if I ruffled your feathers! Actually my comment was more about the fact you got it done without warping the manifold- which is why most won't even attempt such a project. Grinding it out, sanding it and all that, comes only after you have sealed up all of the potential leaks- and Richard started by saying the engine and mani were "donated", IIRRC. FWIW, I can weld; I'd trust it for maybe a bicycle or home project, but I cannot do what you did with that aluminum manifold- you get well deserved kudos for that. My further question about the throat of the thing had to do with introduced, visible roughness- I was wondering if something special might be happening there. But thanks for your response, Amos- finishing that mani and it sealing without two gaskets or "playing games" with odd torqueing patterns to try and seat it impressed me, sorry if I mis spoke.
Na you’re all good! There isn’t a lot of good pics on the inside after it was done. It’s probably nicer inside then you’re thinking. You’re not ruffling feathers. I wish more people would modify these for others. Unfortunately I don’t do them and the those who do honestly are not doing what is needed to make good power. They will do one of the three things and then charge to much.
Should review the parts offered by Raylar Engineering as they are then next to only people who offer parts for this monster.
Raylar has dyno sheet on their parts. Available on their site. Those dyno sheet were run at Westech from my understanding.
Now we just need some huge canted valve heads 😂😅
Small turbo big turbo test next right?
No , just the big turbo !!
Interesting test! I’m curious how that would compare to a test ran with a holly sniper type fuel system.
they don't make a sniper intake for the 8.1l
@@richardholdener1727 I wasn’t sure. I figure at some point Edelbrock will probably make a carburetor type intake for these. Considering how popular they are becoming.
Just for fun…I’ve been wanting to setup a distributor-less ignition system on an old school big block with a coil on plug set up.
dart already did-I have one
@@richardholdener1727a sniper type system should bolt right on then right?
Do you recall if you had to change the tune much when you swapped from stock to ported intake? I have a boat and it’s a lot harder to change the tune on it $$$$
WE ADDED FUEL
I'd like to see how much low end power this engine could make for towing. I have an 02 Chevy with this motor in it and feel dumb when a 6.0 or 6.2 small block makes more power and gets better mileage. I need more oomph to account for the garbage mpg.
YOU NEED TO LOOK AT THE TORQUE LIMITING OF THE FACTORY TUNE
I can see thee o ring onon the bottom of throttle body?
I try and watch every 8.1 vid. I have these in my boat and am looking to rebuild or repower. Struggling on the decision to rebuild or go gen 6. In either case bigger CID 540-555 and 700hp goal. And suggestions??
na or boost?
Life. Not lift
Not sure how long it would live at 4000rpm for 3-4hrs many many times per season.
Hey Richard, we've got a whole bunch of prototype 8.1L manifolds that have short runners if you want to use em. You'll throw away a ton of torque, but you can extend the RPM a bit. I'd start thinking about a set of pistons as you're going to need a lot of duration to really make the short runner intakes make sense.
love to try some shorter runners-also ported stock heads
@@richardholdener1727 I spent about 8 hours with headphones on grinding the stock ones down. Only took me 2 sets of heads to get a set that I didn't go through the thin castings. There's not a lot of material there. Based on the rear wheel dyno figures, worth about 15hp for all of that work. I threw my ported stock units out after I switched over to aluminum, the change was worth 65hp over the ported stock units.
Hey Micah coy, I remember watching your UA-cam videos 7 8 9 years ago with 8.1 trucks. we all know RAYLAR has great products but the prices are through the also to speak on the intake thing the long runner intake is always going to be better for torque. Be nice to have something that meets in the middle to like you said extend RPM slightly but still keep that nasty low-end torque
The motor is a great platform I'm just looking for some input from truly skilled guys like yourselves to put this motor together properly
@@ronkirkham3410 I would say the GEN7R at Raylar with mid length runners is your best bet for a more or less bolt on and go application (requires an LS2 throttle body) but there aren't too many options in this arena. If you can find the now discontinued dart carb manifold, its about the only manifold I know of with shorter runners, but it does require a full conversion.
Thing is, the displacement of the engine and limitations in the valve guides (for lift) as well as the pistons (again lift) mean that you're heavily machining heads and buying pistons just to run a cam that will support your 6000rpm, and then you still have to feed the engine enough air. The ZZ502 is about as big as you can go without kissing pistons and a 230 cam on a 496 is basically the same as a 210 duration cam on a 6L LSX.
I normally agree with Richard that manifold dictates RPM, but if your intake, heads and pistons prevent you from running even a mild cam by BBC standards, then you wont be able to spin it to the moon without tearing into the motor and fixing the limitations.
Isn't there an aftermarket intake available for these engines? Could have sworn LT has one on "the ugly truck"
Raylar Engineering is the company that made that intake. They are way expensive though at $1350. It seems like everything Raylar Engineering makes is over priced.
Any chance you're going to test that new Raylar intake?
Wish we could see the torque curve at 1500 rpm and up. But that's most likely the limition of your dyno?
wot at 1500 rpm a lot are you?
Is the larger throttle body opening the main source of the gains, or is cutting out the floor of the intake the main source of the gains?
I'm wondering the same. Plus I have the electronic throttle body. Not sure how to sneak that larger throttle body with the smog or if there is an electronic on that large...? Thought about running 2 smaller throttle bodys.
Each thing helps a little. But testing each thing would take three intakes and three times the work almost. That becomes much more time consuming and expensive. So to just run a well modded intake is the best option.
New Dyno video 😅
Hi Richard.
This not related to your video. Please forgive me. I would really appreciate your advice. I have a LS2 L98 motor bore to 4.030" Wisco K448X3 pistons. Make good power on wheels (389kw on wheels) but still smoking and use oil. Ring gup us perfect piston to sleeves glearence good. Dubbel chech at different machine shopsWhat can be the
cause. I would really like and appreciate if you can give me same guidence. Thanks Richard
the ring also needs to seat properly-the ring to cross hatch pattern compatibility
@@richardholdener1727 Thanks Richard. Thanks appreciate you advice a lot. The motor had run currently about 2000km. Wish you a great evening
Try pulling that intake off while the engine is still in the bay. It’s smart to maybe have a buddy come over to help. Super awkward.
Not surprising at all. Ls stuff picks up with ported intakes and bigger tb's to. Not quite as much as this monster tho.
Could you just swap wiring around on the coil packs or plug wires to run that cam if you are using a factory pcm? Honest question
Coils and injectors
yes
Boost time 👀👀👀👀
Let’s talk torque for a second a bolt on 8.1 can handle 11-12PSI all day which is madness 12 psi on 500hp and 600 torque with out pushing to hard that’s 1100-1200hp and 1500 lbs of torque
Part 4
please tell me youll be trying the dart carb intake
did you watch the video-that was covered
The heads will flow at least double these numbers. It’s not a flow deal. This is a factory cam, heavier springs, and a stock intake that’s has been opened up. These are decent/good numbers for the combo! Plus who knows how this motor was treated before lol. But definitely a strong runner and can’t wait to see more upgrades!!
I think it needs more cam too. Richard has a history of WRONG CAM though.
Have you considered changing the header size yet ?
More in more out ?
Maybe
Regards Sid
that is not how headers work entirely, but yes I have run bigger headers (not really needed on a sub 500-hp motor)
I understand at this hp range, but was wondering how the displacement might affect the primary size and collector may be affected in this cubic inch range
Velocity vs cfm affecting scavenging possibilities
I have a 2007 2500 HD 6.0 and would like to swap it for an 8.1. Can I use the current wire harness and CPU or do I need to change it? Thanks.
crank sensor wiring is different (need to be flipped), otherwise might work with proper tune
@@richardholdener1727 is the firing order the same?
@alejandrolongoria9945 firing order is the same . Not sure if you're the one who posted on suburban page about doing the swap .
That Cam is crippling the motor. A cam change with decent specs should have easily made 600+lbft
420hp on stock cam just with a tune is that correct? 80hp over factory tune?
you can't compare a factory hp rating to dyno data
Get with raylar engineering they have what you need for the 8.1.
Air gap manifold and carb vs that?
I HAVE THE DART CARB INTAKE-THERE IS NO AIR GAP
600 ft lbs at a "fast idle" is pretty cool. However, it's almost 500 cubes. I think it needs more cam. WRONG CAM RICHARD!!
Should do a 540 stroker with the stock cam and intake and see how much displacement alone changes the torque
Aluminum is one of the worst materials for an air intake, because it conducts heat so bad in this case. Plastic would be better.
With gains everywhere could he have afforded to chop some runner length or would it be worth it? It looks like a 125mm might have fit did you do a data log or record the map reading on the Holley? Like was there vacuum on the 102 @wot? I doubt there was did you happen to notice?
I DID NOT DATA LOG, BUT DOUBT THERE WOULD BE WITH A 102 MM TB, BUT THE QUESTION NOW IS, DID I RUN A 102?
I wondered... in our last episode of Tricky Ricky Does Wonderous Things, i think we said a 102mm does not fit
it fits on the mod manifold
@@richardholdener1727 I thought you said it was a 102 I dunno same question though
I would have lost it if you’d used an engine hoist to lift off that intake manifold
only for iron intakes
Now thats a sleaper big block. Almost 600ft lb of torque will smoke tires in your hot rod or send transfercase parts into orbit in your 4x4.
They do that stock.
Could that engine somehow be turned into a carbureted engine??
Easy- I have a Dart 4-brl intake manifold
send me a intake Rich,
And this is with less than a “custom tune” right? Probably another 20HP/TQ to be gained…
TESTS ARE ALWASY RUN WITH AN OPTIMIZED TUNE-
@@richardholdener1727 Ok. I thought I had heard you say before that you didn’t place an emphasis on custom tunes during these testing runs.
looked like you may had a vacuum leak at the bottom of the TB
THERE IS NO VACUUM LEAK AT WOT
Random question, what exhaust would be better for a 500RWHP LS3 with 1-7/8 long tube headers and why? 2.5” or 3” dual?
3
Richard, when is it getting a procharger? 😈
Its a shame that nobody makes a single plane-style manifold for the gen 7s
You should corner the market on that!
@@midwestdave33 There might be a market for that but not from this guy tho lol ain't no way I have the skillset for that kind of R&D
Dart 8.1 carb intake.
that is next
@@richardholdener1727 What about that new Raylar 8.1 intake? Maybe you could borrow one from them or @LawrenceTolman since he might be the only person to own one.
The modified throttle body / intake looks like an elephant trunk
600ft-lbs... Daaaaaaaaaaaaaaaang
Personally I blame squirrels.......