I broke 3.

Ringlands are really bad on three of the pistons - like half the side of the piston falling out bad.

I don't think it was lean, although my lc1 did crap out about the same time. I think it was the blown headgasket before, water does some nasty stuff. Oh well. No signs of recent detonation. Although those couple of 25+psi spikes down low may not have helped either.

Some damage to the block, going to see if another .010 will get it - I'm already .030.

The unemployment monster finally hit our house, so I don't know how quickly I will be rebuilding but I'm going to be hopeful.

 

****ty news man, oh well build it bigger end better, when you have a job again that is lol

Jay

 

Photos of the carnage?

I don't know much about your car overall besides it appears you have had it rebuilt and what info is in your signature, but I do want to see pictures of course hehe.

Good luck with it, I hope another .010 over will be ok.

 

Sorry about the stack of bad news. Got any prospects for a new job? Hope so...
Dave

 

Wife was laid off, not me - But we are about equal bread winners.

SRP -24cc dish pistons
eagle h beams and 3.5" crank
2 bolt mains

Will get pics in a bit - going to take it to the machine shop, bore that once cyl and see if it cleans up.

 

so the 4032 pistons did what we thought they would. sorry to hear about yer luck. **** happens, ive learned to just roll with it. thats why we have daily drivers. I dont trust 4032 pistons for more than a 200 shot or 10 psi boost. They just weren't meant to handle that kind of stress and temps. I suppose if your tune was perfect all through the range you might get away with it, but it only takes one time for something to go wrong when yer runnin the ragged edge. The 2618's give you more of a safety margin from what i've read. Let us know if you find a reason for what happened. I blew up my stock bottom end lt1 with 7 psi because my lc1 also crapped out on me and apparently my walbro pump and stock regulator were both having issues as well. Bad combination.

Right now Ive replaced the pistons with KB forged 2618 -18cc's and scat 4340 I-beams with 7/16 bolts, and stock crank. Im crossing my fingers, so far so good. Smaller cam and 10 psi with meth injection seems to be making more power than the larger cam with 6-7 psi. Any idea what kind of power you were making? Im concerned with the stock crank at this point.

 

I was putting right at 600 to the wheels and about another 100tq. But I am on an Eagle 3.5" crank too. I think I am going to go with the new Mahle piston whenever I can spend the money on a set. If the block can't be saved it will just be a few hundred more to get another and have it prepped. I can do everything this time around except for the line and cyl bores.

I suspect with my blowby and evac issues over the past several months I probably broke one a while back, then as more broke I started to see more oil problems. Really the thing still ran strong when I parked it. I was bad and did a couple more pulls on the way home even after it started puking.

Main caps look good so far. 2 bolt studs.

The mp70 spooled about like a shot of n20 and was pretty small for my motor. I don't know if I have mentioned it yet.... but the mp70 is gone. Hunting for a little bigger cam while its apart too.

 

I have a set of .40 over wiesco boost pistons. I bought them used and don't know how many miles or even the dish but I could probably find that out if you are interested.

Jerry

 

I guess I need to hurry up and get my block checked out then. Is there a part number on them or anything? I was running 24cc dish and want to stay as big as possible.

Thanks.

 

if u can just go .010 over and use new rings, irocthisz28 on here has some -24CC SRP's for sale for pretty cheap

 

jsetzer,

Do you know what causes the boost spikes down low? I'm trying to make my stock block turbo corvette live for a while. Are these boost spikes normal for a turbo or can they be controlled and how?

Thanks,
Steve

 

I had torn the reference line going to by wastegate while putting the motor back in last time. Good news is the cometics held fine. Mine were not a "spike" really thats just how much it made down low because the gate never opened. Either your gate is not opening, or not opening enough which could be thats its too small also. Usually too small will be a slow creep up though. Mine was almost instant.

Thanks Ream, after thinking it over I am for sure going to avoid SRPs this time around. I may pursue those used Wiesco - if not then prob the new Mahle.

 

I found them today but I am going out of town and won't be back until Tuesday. I will get some pictures when I get back. I looked at a couple of them but didn't see a part number.

 

That works - It will be monday before I can get the block to the machine shop.

 

Going to get a few carnage pics up:

The cyl I'm most concerned with. Should have got some lights and a macro lens... too lazy.


Ringlands on 1


Ring land seperated