rockoosi1

iTrader: (1)

I just took my LQ4 out of my car after loosing compression on two cyliners. I discover two crushed ring lands but no other damage to cylinder walls. My original pistons appear to be foating wrist pins and the spares that I have are pressed in. My guess is the ones I have as spares aren't from a LQ4 like the guy said.

With that being said I'm considering either swapping in an entire set of forged pistons and maybe rods. My question is who sells stock size forged replacement pistons only? Or will I be forced to buy pistons and rods.

KILLER-LS1

iTrader: (18)

you can buy just the pistons. weisco makes pistons for the stock bore size (4.000) or if you hone it out a lil bigger (4.005) or (4.030) so depending on if you machine the block, you can get any of those sizes. Its always good to put a light hone on the block to help the new piston ring seal.

SATAN

iTrader: (2)

Can I ask what you were doing when you broke the ring lands if you know? I'm assuming detonation? Power levels and such?

I only ask because I have a builder LQ4 that will be going into my car after one more season with the VG 3 liter.

rockoosi1

iTrader: (1)

I had been running about 6psi of boost using the MAF but got greedy and turned it up to about 10 psi. My tune got away from me and thats when I noticed I had lots of blow by. When I put it back I will get rid of the MAF and go SD.

turbo iroc

iTrader: (1)

I used wiseco 4.005 pistons and gave it a. 005 hone. The block was stock with 70k miles on it. Flatlanderracing.com has the best prices, call them tho, the prices they have online are not correct. I paid just over 500 bucks with rings.

rockoosi1

iTrader: (1)

Would you happen to have part numbers? Also did you change your CR at all? I called Flatlanderracing and he wanted CC of the heads, desired CR etc. because he didn't know what the standard replacements would be. I'm trying to change anything other than adding a little strength.

rockoosi1

iTrader: (1)

This is actually all I want to do is just put a light hone and go with forged replacemnets pistons. Would you happen to have any part numbers?

turbo iroc

iTrader: (1)

No it was so long ago... it was I was using eagle rods also, might have been 9.2cr with a 72 CC chamber. Stock truck heads are 71cc I believe. I sold the rods and pistons and went with a stroker crank. Are you trying to use the stock rods? If so the pin diameters are different and it'll be tough to find a set of forged pistons for stock rods. I wanted to do the same thing at first, just put good pistons on the stock rods, but I couldn't find anyone who made them. The rods were cheap too under 400 from Flatlanderracing. Ill see if I have any pictures that show the part number for you.
PS if your motor was an lq4 it should have dished pistons, do a search to find out what CR lq4s are. Mine was an lq9 and had flat pistons so I decided to go with a lower comp piston.

Hank Peabody

iTrader: (2)

They should be something like -4cc or something, very small dish in the LQ4 pistons, you might get an eye dropper and see how much water you can fit on your piston dish, it will be a real rough estimate but should get you close.

yessir

iTrader: (5)

glad to see your coming to the dark side satan, ls motors and z cars were made for each other

stock48

iTrader: (17)

One thing you need to watch when running a std GM bore is the bore is usually 4.0015~4.002'' and not right on 4''. Most manufacturers base their std pistons off a true 4'' bore and will lead to too much clearence. If you hone to 4.005' and get a 4.005'' piston you won't have to wory about this.