this is the WORST ENGINE DESIGN I've ever encountered
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- Опубліковано 11 гру 2024
- I can't believe GM built an engine like this, but I'm taking matters into my own hands and fixing the problem the right way. Have you ever noticed how my turbo 8.1 smokes on deceleration? Have you ever wondered why a 8.1 big block uses so much oil? Well, it turns out when they designed the PCV system they really phoned it in, and there is a huge flaw with how it works. We're opening up my junkyard 8.1 for the very first time to see what it looks like inside, and then we're gonna fix the intake manifold the right way.
Check out this video where we modify the throttle body (and do the first half of this job) and go on our very first WOT test drive! 5 psi was so fun back then, but we've come so far since.
• 8.1 Turbo Big Block Si...
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The turbo would spool quicker with a vacuum line to the top of the gate and a boost controller that would hold the gate 100% shut until the commanded amount of boost. Just a bottom reference opens the gate slowly, giving up response.
The turbo smart eBoost2 controller solved this problem for me. Love the build 👍
Maybe this "slower" spool is what has kept the junkyard engine alive?
Adding a supercharger to the turbo would give hime hp at low rpm’s
@@eric9249 absolutely a possibility
rofl no need for a boost controller manually with the proper popoff/bov/wastegate
@@eric9249 and it running on e85
So it's similar to the system on a LS engine. I had a check valve on my intake tube but I ran into oil leak issues. I vented each into a deep catch can. I tapped it for a hose connector, ran a hose to the bottom, filled it with steel wool, and then vented the top with a small filter. No oil in the engine bay. If the crank case sucks in on either side, it's just the oil in the can. Closed off both intake pcv spots.
Good video man. Love watching this journey.
i hope this channel is getting you paid sir, i enjoy watching you build cool stuff
On 80 k subs he is making about 300 a month maybe. No it's not paying yet. But a great tax shelter to spend some of that power nation money!!:)
I think he did something before UA-cam that eared him a bunch of money so he can do this stuff.
@@djdiheheidifhdhdje261 yeah he literally had his own tv show
@@numlockkilla definitely making way more than 300$ my Chanel with 7k gets 100+ a month
Hh
With all that boost bleeding into the crankcase, I am surprised you didn't blow out a rear main seal or other seal. I am really surprised there wasn't a check valve.
luckily, I had modified the throttle body last year so it will bleed out some of the extra pressure which is probably the only thing that saved it
@@LawrenceTolman hey LT, would still check rear main seal just to be careful. If you have time
Sooooo was it a true 20 psi going through the motor ??
@@ls3ws641 it’s was 33psi
We have problems with em in the winter on generators.
On those 8.1s used for industrial, on the back of the intake is a can with a mesh filter in it ,and it's always loaded with water.
Damn propane fuel sucks bad for that.
Clean em out every service and you might avoid having it freeze,then the pressure blows oil out the front seal.
Last one I had blew out like 4qts.
The later 8.1s put insulation around the can and don't have a problem.
Hi LT, my two cents worth;
first, was there a separator shield under the intake manifold? didn't see it. All stock 8.1's had the shield originally from GM. It's job in life is to keep the oil film/ vapors separated in the air space under the manifold and away from the calibrated vacuum leak. with out the shield the vacuum will suck up all the vapors thrown off the spinning cam and lifters. Also you have the original plastic intake gaskets that GM found lost their compression seal very early and oil was sucked into all the ports. this was found to be the main cause of oil consumption on the 8.1. GM made a new style of steel gasket with a black rubber O-ring seal for the 8.1. It seems to hold up much better over time. Sooo that stupid vacuums leak works very well for almost all NA applications. With a boosted application such as your blow through turbo, or the older Whipple that used the stock manifold, you do need to plug the hole in the bottom of the manifold to keep from pressurizing the crank case and blowing out gaskets. .
I would bet that the reason you are not smoking any more is that you put on NEW intake gaskets...
This has been a common problem even on the GM 265-283-327-350 small blocks for years, replace the intake gaskets ,oil smoke goes away.. Me, I still like the design of the calibrated vacuum leak for the PVC. keeps the engine pretty much leak free for hundreds of thousands of miles..
still love your show.
Best to you.
LH.
hey, you could be onto something with the gaskets. and yes, the little splash tray is still in place above the lifters and below the intake
How about a check valve for when it’s under boost but releases when the manifold returns to vacuum?? Kind of like the 1.4 turbo engines have from the factory?
Wasn't the AMC 242 the first engine with the "calibrated leak"? Either way it sure works good on that motor.
Great job on fixing that smoke issue!! I really enjoy watching your channel and the updates that you make to your trucks!! Can't wait to see the 535 all together and running and I know it is going to be incredible!! Thanks LT!!
I think a big part of your success is a good, and safe, tune. Great job, looking forward to the 535!
Thanks, and I'm looking forward to that as well!
Most engine failures are caused by a bad tune
@@LawrenceTolman having that “larger/laggier” turbo definetly helped. Those motors do not like torque spikes on the lower rpm’s. Glad to see it still holding up.
@@LawrenceTolman any chance you'd share your tune?
LT, I haven't gotten to watch anything for the last few months, but I can't imagine a better first video back to watch than this. Sure makes me miss my ol' Yukon. I'm jealous that you got the big Raylar. I only ever ran a ported OEM. 🤤
Also, production-wise you're knocking it out of the park. The music is SOLID, and the volumes are just right. The cutscenes are the perfect length to show what's going on without dragging on unnecessarily. Keep after it brother!
Welcome back, and thanks for the feedback, its appreciated! I've been trying to constantly improve the quality of content, and I feel like its def. worth it!
@@LawrenceTolman Never used it dude...Tried. Can't find ya.
Really happy the way it turned out LT. Been following this build since day one. I have a cammed 5.3 going into my 2000 1500 and a 4l80e I just picked up. Ultimate goal is turbo. I built a bracket for my 40k trans cooler just like yours to recess it closer to the evap core for future intercooler clearance.
This is refreshing as I don't know why it's so hard for many other automotive youtubers or "automotive influencers" claiming to be great builders yet only showing quick snippets of basic wrenching or even a quick edit of a second or two of welding (most not having any certs for such a task). I like to see quite a bit of breakdown or assembly as possible.
90k subs is right around the corner, then on to 100k. With content like this, it shouldn't be too long. Those of us who enjoy the mechanical side are really dedicated to the builds. Keep up the awesome work!
I appreciate that!
@@LawrenceTolman LT, there's a scammer in the midst
@@tslater1989 I think he made a video about this exact thing! Lol.
@@tslater1989 what do you mean?
@@t_train3796 there was a scammer posting. They have since been removed
As a street truck it is the perfect setup. Roomy, comfortable and fast. The second you put slicks on it and launch on a prepped track is when reliability flys out the window. Keep up the great work buddy👍🏻🍻
holy crap,, a video showing someone cleaning gasket surfaces the correct way,, not with a cookie wheel. proud of you man.
That's what a "win" looks like and great video LT!
That pcv setup is quite bizarre. My old man had an 01 Chevy with the 8100. I remember him saying it would pull anything, empty or loaded, at 10mpg! Took that truck to prom, man I thought I was so cool!! Haha
Keep ‘em comin!
I wish my 3500 with an 8.1 got 10 mpg. I usually get around 8 mpg
they do have great torque for pulling, but you're spot on, they do love to drink fuel
Great video Lt glad to see you fixed the smoking problem love the content as always never a flop video from you in my opinion 10 out of 10 will recommend
I’d really like to see the Raylar intake on your 496 before it goes onto the 535
Yeah see how much gain there is on an untouched old block
I absolutely love this channel your knowledge in gm products is insane. I would love to pick your brain sometime and understand where you learned a lot of your engine knowledge. You seem to have a very deep understanding to mechanics in general and I hope someday to be able to understand mechanics like you do.
The knowledge about all things GM that you know is vast and very informative keep up the good work!
I appreciate that!
One is never too old to learn.
I'm not anywhere near a legit motor head, but I've done my fair share of wrenching on my old 68 GTX 440 and 67 327 4 speed Impala. Said all that to say this. I'm loving this channel and watching the progress. I love the COPO truck. 4wd is the way to go. My buddy is helping me build my 99 4.0 Jeep Grand Cherokee as we're going for low end torque.
Keep those videos comin LT. I'm still learning at 68, and you're helping teach me professor.
Blessings.
hey thanks for watching, and for the kind words! its very much appreciated
I Really appreciate the fact that you don’t use a Roloff wheel on your Machine surfaces!
yup, that's a major no-no for me. I've got a super nice and flat aluminum sanding block I always use to clean up gasket surfaces.
Excess pressure in the crankcase will destabilize the piston rings and will allow oil past the rings! Awesome video.
It would be cool to see a big block pre runner!
Hey Lt, I noticed that you cut back on the white pop-up text. I felt it flowed much better, I hope you agree. Thank you for the awesome video and I can't wait to see the dyno results.
I have had my eye on the 8.1 for a few years now, especially considering its use in Suburbans and Avalanche 2500s. I would LOVE to see a practical, midrange horsepower 4WD build for towing and adventuring. I am also well-versed on Raylar, and I'm wondering between their mods and tuning, exhaust, intake etc how cheaply you can get the 8.1 to 500-650 horse and maintain its daily driver characteristics. I know that's a tall order, but I think a lot of people would be super interested in a budget TRX competitor! Thanks for the videos bud, best Chevy performance video on UA-cam.
I found one of my goofy dream trucks, a 4WD Avalanche 2500 w a Whipple supercharged 8.1, not from a Raylar kit. Needs tuning, and not sure where to start, I've been thinking about getting the Raylar aluminum head kit. I will be using it for some towing for work but also as a personal adventure vehicle, so my request is very selfish...
It would need engine management/fuel system and custom tuning, personally I’d hate a supercharger on a trail truck because of the low speed heatsoak.
i think trying to cram the 8.1 in an s10 would be amazing
I believe you have hit on one of the best ideas for an S10. I've messed with 'em since '82. V-8s,boosted 4s and 6s, strokers etc.. 8.1... oh yeah...
Such a solid build. Can’t wait to see the diff between bigger block
Corky Bell's book says basically that as long as the air is at 1075 degrees or less after forced induction, intercooling, and then compression, that you are pretty safe from detonation. On most engines, if you keep the forced induction at 6 psi or less then you don't need intercooling, but to go beyond that you better have it if you don't want to burn a piston.
I'm not sure how the bearings in a BB Chever-Lay hold up to the increased torque of forced induction, but as long as you are not detonating I would suspect that it should hold up. I think those have iron blocks, so it should hold up.
Great video!
Put the 8.1 in an obs short bed 454ss clone but with that turbo big block maybe like 650hp should make for a fun truck and maybe a 3rd pedal ??
Now you've done it! Talk about the reliability, then talk about improving traction. May your reliability continue, Sir.
I’ve probably jinxed myself by saying that
I have been interested in a square body C30 or OBS 3500 tow pig with a 8.1. So that is my vote.
PCV is very important, I wouldn't delete it. At least throw on an in-line check valve and route it up to the airbox like they did in the old days. Without PCV your oil will get dirty much faster due to the blow-by gases staying in the crankcase longer and contaminating the oil.
Hey lt. Little know fact that opens up the lighting into the engine bay is the hood service position on them Gm trucks. You remove the ground strap and the hood bolt on the hinge you can open the hood up higher and reinstall the bolt holding the hooks in a near vertical position. Makes life easy
Great video man. As for what to do with the old 8.1 when you get the built engine done, I would love to see you do towing / workhorse mods. Many of us 8.1 guys would really like to see someone do detailed videos about what mods can get us more grunt and real usable power in our tow rigs. Test which mods are most beneficial for the cost/effort they take.
More power = engine that doesn't last as long. They de-rate the 8.1 on purpose so it lasts longer.
Most cost/benefit mod would be swapping that low power gas chugger for a turbo diesel.
It’s like a brand new used one 😅
Glad that fixed it.
I love my neighbors, but God why can't I have a neighbor like this...😭
Awesome work! 👍
I like how LT uses inexpensive tools to show you don’t need the tool truck tools, although I like my tool truck tools, just shows you don’t need the best of the best to do good work.
so what vehicle should I put the old 8.1 into once we get the 535 build done? AWD S-10? an OBS Truck? someone brought up the idea of a burnout vehicle, and I do like that thought... let me know some good ideas!
Overland / Rock Crawler 2 Door GMT400 Tahoe!!
Chevette burnout car
4th gen camaro burn out car i have a 99z28 6.o rips ass
I'm down for the AWD S10! Would be like a Syclone on steroids...
Mid 80s Caprice wagon.
I didn't think that was going to fix the issue I totally thought it was a oil feed or drain issue but that tells you how much I know about the Big Blocks. Also run a little bit of ATF in your next oil change and clean up the inside of that engine.... it's dirty.
you're on the right track though, part of the problem is that pressure in the crankcase will fight against the oil drain from the turbo...
Nice BBC build!! Refreshing to see more Big Block builds
My husband said that in one of your other videos you mention putting a big motor in the tacoma, he suggested maybe a new project truck? a S10 4x4 5speed? like the syclone trucks or your copo but a stick shift project because a manual shift 4x4 street truck would be a great different type of project truck that alot of viewers might love to see? an testing how a GM NV350 transmission holds up to the junkyard 8.1 an the torture of all 4 wheels hooking when ya dumb the clutch compared to a after market transmission an a high performance clutch? I know my husband would love to see a project like that on ya channel an both of ya seem like hardcore GM guys! He says keep up the amazing work an he tells everyone about your channel an he's seen everyone of ya videos
I feel the lack of traction is what’s saving that drive line. Once it hooks it will all turn to dust. Lol. Seems like it’s making good power though. :D
Good to see you landed on your feet after power nation.
Don't block it off. Go catch can you still need that ventilation for ventilation.. Dumber ideas is starter in the transmission or under the intake plenum.
For a fully operational pcv system you could plumb it into the intake side of the turbo. But then you'll need a drain on your intercooler.
8.1+Square body blazer x by 4.88’s & 33” M/T slicks = YAaaahoooo!
Quality video after Quality video !!
Thanks LT !! SAFE TRAVELS!!
Much appreciated!
Interesting it's always been said the 8.1 used oil due to the large bore size until it warms up. After seeing this I'm thinking this factory pvc is more at fault definitely will have to do this mod on my 8.1. Looking forward to testing on the 8.1 the old engine would be sweet in the copo truck or one like it.
dont bother, he is incorrect
Dude, you need a bigger parts washer! great content, love the more in-depth content as opposed to the former show, which I loved, but this is way better!
The 96 to 99 chevy vortec spider injection small block is similar. The fuel pressure regulator is on the inside of the intake lid and just pulls vacuum from the intake charge instead of using a vacuum hose and being mounted externally. I'm glad you made a youtube channel! I have been watching powerblock since I was a kid. It would come on every Saturday morning starting at 9am with extreme 4x4 with Ian. Those shows fueled me to do what I do as a career and drag racing as a hobby and it takes all of my money 😆 one of my dreams was to be a host on powerblock. I might go after that dream I believe I have enough credentials to do so with ase certs and other stuff. But man I'm glad I still get to watch your episodes!! Keep it up sir
hey thanks for watching! I also loved watching powerblock in by younger days and learned a ton watching the shows, as well as working on 'em!
Uh oh! As they say; "You let the magic out"! (By opening it up, of course) love the vids, man!
lol... let's hope there's enough magic left inside to last the rest of the season
Actually ... as the Chrysler 2.7 V6 is the worst engine design ... we must conclude you have not yet encountered one of those sludge factories.
I'd cap that under intake port and drill the valve covers for a traditional PVC. Plumb into the vaccum side of the turbo.
for the 8.1L find a suitable chassis for doing some off-roading stuff, maybe do a custom 3-4 link with bigger axles on 37-38s, i know you like your trucks low but something different with a good amount of fab work
My favorite would be the Excursion. The V10 just plain sucks compared to the 8.1
I do need to build an off-road style rig at some point
The no start thing makes sense, my car is originally a turbo with a MAF in front of the turbo, at one point I had switched to a MAF behind the turbo instead. Once I did that, I had odd behavior from time to time that I couldnt pinpoint, weird things with the MAF curve that I always had to fiddle with. Eventually when I switched to a valve cover with no PCV, discovered what was happening was the PCV was sucking unmetered air from the bottom end, because the other two valve cover breathers were all in front of the MAF. It's interesting how something small like that can cause an issue.
I would like to know how this motor would hold up doing the work that it was originally designed to do, in other words, pulling a heavy load. I have one in my 3/4 ton Suburban and I would like to know how well this would hold up to a load like I've hauled in the past with my suburban, grossing truck and trailer together over 20,000 pounds. Meaning, more than 15 to 20 seconds at wide open throttle fully loaded
I believe it would do just fine possibly even better than an old school big block why wouldn't it ?
@@glennmanchester5696 well, stock it does great. I'm just curious how it would survive with his setup (completely untouched internals) on a long wide open pull with a really heavy load.
Oh I get it well I guess no one knows it would be dependent on so many factors maintenance age milage etc I would have to say I've heard they are not the strongest motors ever made so it guess if it were me I'd go a little easier on it for that reason
Gotta love a good Ol' murica' made Cast Iron V8. You only need a basic socket set to pull it apart. About the only special tool you need is the fuel line disconnect tool.
New cars have so many types of different bolt and screw heads that it makes them a pain to work on!
LT the reason GM used a fixed orifice PCV is so the bypass air that enters the engine is metered by the mass air flow sensor. And less moving parts. For a naturally aspirated engine with efi it’s a wonderful solution. Not so much on a booster deal.
*Boosted
Miss the burn, but dang that truck is amazing, I keep my eyes peeled out here in Lehi for it 😂
Future 8.1L build? I have a '73 stepside project I've dreamed of dropping an 8.1L into. I've slowly been gathering parts that would come with it, like 1 ton axles (KP ford Dana 60, disc brake 14 bolt), I do have core 8.1L with accessories that needs rebuilt, a 4l80 and np241.
I don't plan on selling it, BUT I haven't touched it in 5 years and I would love to see it actually be built if it's an idea that entertains you.
It would be a big project, but you undoubtedly have the skills
IDK why this was in my recommended, but I liked it.
While of course I haven't seen them all, I've never seen a factory PCV system that I thought was any good. When you get around to a proper system add two bits you didn't mention. An exhaust scavenging tube, a tube that you put in your downpipe at an angle and it'll pull crankcase gasses into the exhaust at high throttle. And a vacuum release valve on the breather in. This will control/limit vacuum levels in the crankcase.
As far as something to put the 8.1 in. Find a 95-99 two door Tahoe, that'd be a blast. Frankly it'd likely be a better drag vehicle than this pickup, better weight transfer.
I know you are a GM guy, and that's great. I'm just curious if you are ever planning on doing others in the future. As in, any other dream rigs you wanted to build? No pressure, even if you dont want to build a ford. I love the content, and I'm a ford guy 😄. Keep putting videos out, I'll keep watching. You definitely have the potential to build a brand, maybe even get a shop and business going.
May I offer some advice, when running E85 and boost don’t recirculate the crankcase back into the engine.
The higher the ethanol content the more blow-by there will be and oil does not like to be compressed and can cause pre-ignition.
Pump gas, re-circ is fine but ethanol I do not recommend it.
The PCV system on those absolutely sucked and led to hundreds of of the trucks I worked on while I was with GM to have massive oil consumption issues.
A lot of people like to blame engines for their mistakes. Bad assembly, bad mods, and most importantly bad tuning. It's my view that the people who know best what they are doing tend to find the most reliability.
I don’t know if this was mentioned but when you think about it. After a pull with all that boost it’s not going to let the turbo drain drain freely. You have a pressurized crank case essentially plugging your turbo drain.
you are correct. I had planned on mentioning it in the video but forgot to...
Lawrence, you are correct. The cam in the bath whipping oil vapors up to a tiny unbaffled hole is the cause of a lot of the oil consumption. Chevy's design was probably meant for low RPM truck drivers or something back when straight 30w was being changed every 1500 miles. Next, you are correct. You DO NOT wan't to use any pcv connections behind the throttle body as it will vacuum up your oil on high rpm deceleration on top of the already high crankcase pressure created with high rpm. It does this on pcv valve cars too. Just go ahead and plug them all and quit using them. Third, you need to keep boost out of your pcv loop. The entire purpose of the pcv system is to evacuate crankcase pressure not add to it with boost. Glad you at least didn't blow your seals out doing that. A lot of the guys who guy from NA to Boost do that sometimes lol. I would look into plugging that hole in the intake, and drilling a breather hole on each valve cover and vent them both to a peterson catch can or something. You can still vent them as a closed loop system as well you just need to plug them in in front of the turbo in the non pressurized air. This leads to less stank. You can test out when you're doing all of this if it works by measuring vacuum/boost on the oil cap by tapping to to a sensor and watching it inside or datalogging the crankcase pressure. Effectively venting your crankcase should also give you better ring seal from the pressure differential and more horsepower since the pumping losses will be lower with less crankcase pressure. If you want to go wild you can do a vacuum pump. This was wordy but you should try these out. Don't be afraid to try 12 AN connections on the two breather hoses either. I've seen some crazy shit on track cars to keep them flow sucking and blowing oil.
I'm surprised to. You definitely work that motor.
You and me both!
Any positive crankcase pressure will result in turbo oil drain issues, especially if the drain hose isn't very big. The oil leaving the turbo will be somewhat aerated making it foamy, so if you have any crankcase pressure it won't drain properly and will case the turbo to leak oil through the exhaust seal and causing smoking on decel. Imo you need alot more crankcase ventilation, like a vented oil cap and it will fix it. I've seen this same issue on several build, and crankcase ventilation has fixed it every time
When you get the 535 in, you should use the spare 8.1 as a low buck demonstrator. Cam/valvesprings setup with the S480, put it in something cheap and rwd, like a shitty G body, elco, whatever.
So glad you started doing shorts on UA-cam soon as I seen you I hit subscribe can't wait to see some very informative videos you see what you guys all time on TV
I appreciate the sub! Thanks a ton!
I need to find a video about why we even connect these systems through the air intake. What does that connection to the oil do for the air intake? How does removing that negatively affect (effect? I'm tired) the engine?
as the 8.1 is a vortec, even though it is LS family, does it have an iron block and heads?
Not LS family, just a LS style ignition system and fuel delivery system
Iron block
Iron heads
It’s not a LS. Yes, all iron. I know the intake was AL and the water pump might have been as well.
Consider this motor isn’t intended to be boosted. I’m sure if they came out with a boosted motor from the factory the system would have been changed. Good enough for a NA motor.
good enough maybe, but even N/A 8.1 engines suffer from excessive oil consumption, and this is the root cause of the problem I believe
and as for paint. old school all the way! I own a vintage car so I love the old school flamboyant loud colors 😅👍
Here's the deal that nobody knows unless they have ordered one of these engines from the factory. They came in different dress. Now if you had the 490 hp variant of the motor. You wouldn't put much boost to it before the pistons became grenades.
Depending on the year you could find a nice low compression 360hp version too.
When I went to order my last one back in 2007 I was given 5 different power options for the truck. I went with the middle option. I don't think mine would respond well to a lot of boost.
Honestly though, change your crank, forged internals, new heads. She'll make a lot of power. Lots of guys used these for years for nitrous builds too.
Good work LT!
Love the channel
Here’s a Top tip
Oven cleaner eats carbon
Just let it sit for 5 minutes then lightly scrub with a plastic bristle brush
Just be careful with plastics and rubber
My favorite is Easy Off Fume Free
So when you get that annoying OCD voice in your head your arms won’t get tired.
love the tip! need to pick up some of that for the inside of the intake next time it comes off
Here's a tip top tip
Oven cleaner (lye) also eats aluminum.
I learned something new today on that egr, thanks LT, Aloha🤙🏽
Right on!
Awesome channel..I'm subscribed...good to see how normal people work on their motors as apposed to the other crap out there ....makes me miss my 96 1500 GMC Sierra...5.7 vortec, procharged, it sounded mean...I ran and gapped ALOT of different cars and trucks especially mustangs they hated getting smoked light to light, unfortunately the neighbors flicked a lit cigarette unto their lawn while backing out of their driveway..grass lit up and wind blew it right to my truck torched it...so he handed me 6 grand that day but truck was wasted. ...any ways thanks for the videos sir.
Great video LT.
The 4.3 in my 06 gmc 1500 is the same way no pcv just a tube with a little hole in it coming out of the valve cover and straight to the T/B
How about putting the 8.1 in a 88-98 c1500 you could do a 454ss clone or tribute, I’ve always like single cad step side bed for those years in 2WD.
I have a 1994 Chevy Silverado king cab short bed and I was wondering if I could put the 8.1 in it? It has a 5.7 in it now
Absolutely you could, would be a pretty easy swap in fact.
I think GM used a similar PCV system on many of their platforms. My daughter’s 2011 Equinox 4 cylinder has a tiny hole in the intake manifold. It clogs with buildup and leaves moisture in the upper intake. If left plugged up, it can blow the rear main seal. Probably saved them $3 per car…
How are you going to stop the crankcase seals do not just blow out the ends?
The Saab b207 engine which is based on the ecotec has a small plastic PCV valve sitting inside a passageway in the cylinder head or intake manifold. I would not be surprised if the passageway on the big block isn't the same size and I know the valve is not present in non-turbocharged ecotecs
You know your stuff! How much life do you think is left in the 8.1? You have put it through the wringer.
Just put a pressure gage in the vavle cover and see how much pressure is in the crank case.
Albeit not 8.1’s but our race engines run three -10 breather lines for the crankcase and head, it’s a recirculating system and the catch can dumps excess oil back to sump as well as being open to inlet vacuum through the baffled and separated catch can.
If I were you I’d get more crankcase reliefs on there as you will end up blowing out seals.
Very cool to see though shame we can’t get e85 from the pump in Scotland though.
when we re-do the new engine, it's gonna get a much better breather system like you described, this was just a stop-gap measure to get through the rest of the season on the stock engine. It is too bad you don't have e85 available also, its a great alternative to high dollar race fuel like 105 or 110
LT I'm finishing up same swap thanks to your help! How did you reposition that barb coming out of the throttle body for your pcv setup? I can't bolt my cable throttle body on with the way its pointing!
Also what did u do for a throttle cable? Mine seems to be short
It's almost like the engineers never intended the intake to be under positive pressure🤔
Its good to see how you adapt to the problems you encounter. I am from Utah as well and was wondering who you can recommend for engine machining? I am getting ready to build a iron 6.0/ls2 for my 2011 tahoe.
Hey guys, I got a 1983 Chevy c70 with a tall deck 427 in it, it’s only got 11000 miles and we haul stuff with it, any recommendations how to squeeze some power out of it?
Great video! I've been enjoying this whole build. What are you using from 5:30-5:35 to clean the surface of the intake manifold? I can see it's a sanding block of sorts but what is the abrasive side?
It’s a flat aluminum sanding block with some 220 grit sticky back sand paper
I read where if you add a j hook to that Pcv type little pipe it cures the oil consumption on these. I have 04 8.1 with 160k on it. You might use a quart in 500 miles or not any for 3000 miles. Doesn’t matter how you drive town, highway, towing can’t predict usage. I check oil every other fill up so I don’t have to wonder. Also these trucks run low oil pressure with very high volume. The engineer that did a lot of design work on these engines has a lot of info on older forums.
Does the Raylar intake address this issue?
LT! Stick the old 8.1L in either an IROC Z or a 4th gen Corvette!!!!!! Im gettin' giggles!!!!!!!!!!!!!
I'm also shocked to see GM still had old style gaskets in there, and didn't even do oring gaskets.... hell my 97 modular 4.6 in my grand marquis had those!
GM really did do this design over the phone.
I had the same problem with smoke after let off, it ended up being over oiling of the turbo, high pressure oil being pushed into the turbo, I used to things to fix it, one a Turbo Smart Oil Pressure Regulator set to 40 psi for my vehicle and turbo, and then second which was maybe not needed but I installed a TurboWerk Oil Scavenger Pump and it fixed my smoke issue.
I know that on LS they redesigned the valve covers to fix the oil problem I don't know if they did that on the 496 you have for the intake
I don't know if they ever changed the intake or PCV design on the 8.1...