jaredm

took my heads off today (comp replacement lifter install) and all of my pistons where scortched with HUGE carbon deposit, enough to raise the surface of the piston. the car only has 35k miles but has been ticking pretty bad for a couple of weeks. I suspected a lifter but not this. I really don't think thats normal, I've seen pics of LS1's apart with more miles and less sh*t in them. whats going on?

glennhl

Does your engine use a lot of oil? We had the heads off my son's LS1 and the top of the pistons were pretty clean, just a light coating of carbon. You may want to try a catch can to keep the oil out of the intake track.

Order 66

Carbon build is normal. Just clean them off if you want.

firefighter

check your valve guides on old SBC's they'll cause that. I just pulled an old 350 apart yesterday and it was the same way and the guides are worn to hell.

mr2guru

iTrader: (16)

There is a lot of carbon build up because of the crappy stock quench. You won't see near as much on a tight .030-.035 quench

jaredm

thanks for the reply's.here's a couple pictures , i already cleaned off a lot of the build up from the pistons before these were taken....nevermind , pics are too big , i have to figure out how to make them smaller first..

SSDoubleK

iTrader: (100)

Good post, you just answered my question, my piston tops have alot of carbon buildup also, I believe alot of that is normal, I've thought though running a 160TStat keeps the motor cooler, so it can't heat up as much to burn alot of that excess off. My two cents.

dame

iTrader: (3)

wanna know how i keep my top end clean?

150 shot once a week

s346k

iTrader: (4)

"wanna know how i keep my top end clean?

150 shot once a week"




that should be on a shirt..

roadrash9r

iTrader: (2)

had alot on mine, used a scotch bright bit on a dremmel tool and cleaned them up. Went with a commetic for a tighter quench.

Rudolph

iTrader: (1)

Lots on mine, and when cam swap, i cleaned it up

I think that the catch can (mini air filter) is not working very good

CAT3

iTrader: (9)

I think you meant H & C swap...if not you did the cam a long, hard way

I agree, oiling buildup, and quench height is an issues. Dealing with a buddy that has been troubleshooting odd KR, and my first guess is Carbon deposits. Hate to pull it apart only to clean the pistons and chambers

Lasershop

iTrader: (2)

130,000 on the LS1 from my '97 Vette' when it was removed for rebuild. Very clean everywhere. Bottom end looked like new. Not much carbon on the pistons or chambers. Always ran Synthetic and changed often.

Order 66

That will do it!

gwj

LMAO And I thought top end cleaner was radical.

SSDoubleK

iTrader: (100)

Gonna start using the synthetic oil. Anyway to smooth out those piston tops if your valve dented them a bit?

CAT3

iTrader: (9)

Hopefully you fixed the root of that problem, but anyway...

1) you can scotchbrite the high sides and smooth it out some.

OR

2) rent a valve relief cutter and cut them in deeper.

Rudolph

iTrader: (1)

Yup, you are right, H/C