So I heard a healthy ls engine has cylinder bore compressions about at 180psi, my ls engine is currently pushing out 120psi in all 4 cylinders... Is it time for a rebuild or is it fine since the cylinders all have the same amount of pressure?

Drain ur oil and try running 4 qts of ATF through ur engine like an engine flush for 10-15 mins while it's on. ATF will help seat things, and clean the shit out of ur internals, and won't hurt any seals!! Be sure not to drive it while ATF is in ur engine. Then When ur done,completely drain the engne again, change ur filter add new oil...run it for a bit then turn it off. make sure there's no ATF floating around. try another compression test. This is only a logical assumption...do it at your own risk. I only use this procedure to clean the gunk out my engine/crankcase.

Atf in your motor? Whoa! At your own risk fo sho!

never heard of anyone using atf on a motor before. is there a video to show proof, anywhere in the internet?

Me! Cleans the shit out of my internals. Well you CAN NOT drive with the shit in ur car.... I got this idea from a friend ...he runs atf through a fresh motors he builds (for proper seating...not cleaning since everything is basically new\rebuilt...no duh!..lol)

1) Drain oil, plug drain pan
2) Fill with 4 qts(if ls motor..haha) atf preferably multi vehicle atf
3) Run car for 10-15 mins
4) Drain your engine...while the drain pan is still open flush some oil through...get the lingering atf out,plug drainpan, change oil filter
4.5) ***if you have unlimited access to oil then run ur car for another 10-15 mins with regular oil to get rid of more linger atf then...repeat step 4.
5) Fill with 4 qts(stock ls motor oil capacity)
6) Enjoy a freshly cleaned and properly lubricated engine.

Logically it should help seat things on a new engine but yours is old...yeah so...What I use atf-flushes for is to clean the gunk and grime out my engine. (atf has all those cleaning bs detergents and anti- whatevers)..That and its way better using atf than...those stupid gumout engine flushes that will hurt old seals your engine contains. Btw, i work a lube shop...so basically this shit doesn't cost me anything. haha.

video proof? lol come on man...you dont have to rely on that youtube shit bro. You live and you learn =).


Hasn't fubar'd my engine so far and i've done this countless times...so yeah. AND my motor always feeeeels so fresh after i do atf flushes through it. =)

http://autotechrepair.suite101.com/article.cfm/040206




Idk about the credibility about this place but....Im too lazy to look for other resources saying they do it too but...yeah you get the idea.

but yeah kpj i'd rebuild it...ifffff you start burnin' ze oil. haha..

Try seafoaming the engine, instead of atf.
[youtube]http://www.youtube.com/watch?v=A6RdJeMwNxw[/youtube]

Check out this how to on how to properly use sea foam
http://ls1tech.com/forums/general-maint ... r-car.html

Dude I love sea foam but if you sea foam combustion
chamber you usually foul your plugs. =\

yeah you need new plugs and an oil change after seafoaming

well i did a wet compression test and it it jumped to 150psi, so there are problems with the pistons and or rings; it may as well need to be rehoned. Well seeing as that I was just wondering why would all the cylinder banks be showing such a low pressure, Is it likely for all cylinder banks to be like this or usually only one or two?