140,000 mile LS1 engine leak down results
 

a little history behind the motor. previous owner ran this motor with a 237/242, .603"/.609", 113 LSA and a 15o shot of nitrous in his 99 camaro.

since ive had it, its had a 226 cam with patriot stage 2 heads and a 231/239 .617/.623 111+2 lsa cam with a 150 shot. this motor has had atleast 200lbs of nitrous blown through it.

and for the leak down results...

cylinder 2 7% cylinder 1 7%
cylinder 4 5% cylinder 3 8%
cylinder 6 7% cylinder 5 6%
cylinder 8 7% cylinder 7 9%

i am happy to say the least. i did find one issue though. i guess this is what i get for running about 10 bottles of nitrous through on the same set of plugs plugs lol.

http://img.photobucket.com/albums/v6...h/6326ebf1.jpg

I'd run em again.

so what are you going to do now...??

LMAO that is the new big gap plugs from ngk.. Well to say the least, that is not bad for results... New plugs, let it eat again :D

Probably buy a case of plugs and turn up the shot

compression test i guess. its still blowing the dipstick tube out every time i take it out and abuse it.

That motor is in great shape for so much nitrous. Is this on stock pistons and rings?

plugs look alil worn lol

have you ditched the PVC system yet? blowing the dip stick tube out sounds like to much crank case pressure... I would just put filters on the vavle covers

Charlie told me you were a little busy tonight!

Eh, electrodes are overrated :D

i love this shit though. its funny, all of my neighbors think im some kind of professional drunk mechanic.

the look on their face when i tell them that i'm into government auditing and the corporate side of an auto manufacturer is hilarious. all they see is my greasy drunk ass messing with a loud ass truck

oh, and that spark plug has been that way for atleas the last 1,000 miles lol. i figure since the first time i hit the nitrous with luke03's dad riding with me and the truck shit all over itself on the initial nitrous hit.

the plug was still firing somehow though because after about 3 or 4 backfires it came alive lol

got an idle vid uploaded. sounds like a choo-choo train with the dual open pacesetter longtubes.

1slow01z71's ORY, cutout, bullet and corsa is laying to the side.
http://img.photobucket.com/albums/v6...ture001-11.jpg

Sounds good man, re-gap that plug it'll make it.:D

99 stock bottom end. 140,000 HARD miles. just goes to show what a good tune and proper maintenance will do.

i still think the motor is hurt even though the leakdown cam out so awesome. it's just consuming so much oil and blowing the tube. the oil is 100% not a leak. my only guess is its being pulled through the intake and burnt off but im going through a full quart every 1k miles.

All the beer cans in the bed of the truck is classic, I think I may have met someone who I can drink with :nod:

Atleast I wont start shit and run off and get you in the middle of an angry mob :jest:

still running stock pcv system. at the same time, i have a buddy with a ls1 with a bigger cam, spinning more rpm on the same shot of nitrous and he has never pushed a dipstick out of place. but with my leak down results it makes me wander wth is going on. the motor passed with flying colors:ripped: i was honestly hoping for a reason to rebuild with forged pistons:angel: i've got a sickness

most of the cans blew out on my test drive without the exhaust hooked up:)

no shit:ripped: i was about 1 inch from getting my arse whipped bad lol. all over stupid shit too. went last weekend to get my concealed, but the class was too long for the party planned that night.

have you checked your pcv valve? valve seals or guides?

I doubt its anything with the heads since they have very few miles on them.

Stewart put breathers on it and see what it does, if it stills burns oil without a PCV system then you know for sure its a problem with the shortblock.

i spin alot of RPM. 7k most of the time. i figure most of my oil is being sucked into the intake. i really was surprised with the leak down results. i figured it had atleast 1 hurting cylinder. i think some new plugs and some breathers in the pcv and oil cap will get me on the road and running 100%. can't wait to get my new exhaust in. and the suspension done.

heads only have about 15k miles on them. the leakdown would have show if it had a bad valve seal/burnt valve. everything checked out 100%. these motors are incredible.

and for all of the royal purple haters:nunchuk1:

My old 6.0 was blowing the dipstick out and I did a compression test and they were 0-75. The engine was trash.

zero is impossible...75% is horrible. are you sure that the valves were shut completely?

When I did it, I was getting ~75, when a local performance shop did it, they were getting 0. Anyway you look at it, the engine was bad, it was blowing the dipstick out and had lots of blow by coming from the oil filler.

Good to hear another GEN III motor holding up to abuse. these things are awesome.

I'd redo the leakdown to be sure.

Bend those electrodes back down, slap em back in and give 'er hell!!!

if you gonna run breathers, you might want to check with your tuner about how the tune is setup... If you still running a MAF and trims (closed loop), basically a stock step-up tune, those breathers will allow unmetered air to come threw the intake track and cause your trims to max out, basically you would be creating a vacuum leak...

but if you just run breathers and cap off all lines going to the TB, intake, etc. you will be fine...

Leakdown or compression check? yall are talking two different things

I'm guessing that you don't have a catch can...are the hoses to the valve covers restriced in any way? (the one to the PCV and the fresh air hose on the passenger side). Have you gotten a look inside the intake, through the throttle blade maybe? Take a look and see how much oil is in there...

if you pass leak down, your compression will be ok. leak down checks for burnt valves, bad valve seals, cracked block and worn rings.

i had the fast intake apart about 2 weeks ago. it was SOAKED with oil. i cleaned it up, RTV'd the 2 halves together and tightened it all back up.

yep, believe you on that. Emptied my catch can this past weekend, and an large amount of oil colored liquid with the consistency of milk came out.

just put new plugs and hit that thing with a 250 shot

You need that shot to,or more:D

your right charlie lol

the 250 is coming...if i can ever get everything done. one project keeps leading into new projects, and then the first one never gets finished lol.

compression test is in psi, not percent is what I was noting. right? or am I lost