Had my stock gsr dyno tuned cracked a sleeve on 10psi here is my question ? Why!? Tuner said head gasket when first so as the piston when down it sucked anti freeze and as it came up it had nowhere to go resulting in the sleeve cracking .i saw a/f ratio they were good ..so is the Tuner bsing me!? I will leave the Tuner unnamed . I did use felpro hg and arp studs but torqued to 70ft lbs

 

Nothign wrong with a felpro gasket, been running them for years on multiple setups. Detonation cracks sleeves. it can happen on 10 psi and not on 25 psi just depends on the fuel and ignition timing. if it had to much timing it could take out a sleeve or HG or both at the same time. If the studs came loose then it could take out the HG and then the sleeve like the tuner stated. Many factors here.

 

hmmmmmmm Interesting...I understand detonation cracks sleeves but what im asking is the theory behind what my tuner told me....Thanks again....I am not very scared to boost another gsr lol

 

no reason to be scared to boost a gsr, its done all the time. ive been stock block for a while 400+whp no problems Just need a good tuner. If your not confident with the current tuner you have seek someone else, seeing yoru in jersey you have many options, Evans tuning, Xenocron, NRG tech just to name a few

 

LOL i just noticed all cylinder are a bit darker than the piston that cracked...any reason? And your right....I was only looking for 350ish on stock longblock...is that reasonable...the numbers were 336whp @ 262tq before kabooM!

 

Is 70ft lbs a little less than what is recommended by ARP? I forgot what it was. All I know is, I torqued to 80ft lbs on mine.

It sucks, stock sleeves are a crapshoot, you win some you lose some.

 

the instruction i had said 65ft lb.... bullshit LOL

 

stock sleeves are a lottery...mines lasted 6 months of abuse on a bonestock gsr block...one day got gas and next day boom...cracked same cylinder as you..

 

"the headgasket blew...cylinder got filled with water/antifreeze when piston came up it pushed the water/antifreeze up it cracked the sleeve"...<~ What do you think guys?

 

i dont think thats its that. too much timing, detonation

 

Just wondering, but what exactly does cracking a sleeve sound like while driving? Im hoping to never experience that obviously and i shouldnt ever after im sleeved, just more curious just how epic it is

 

hydrolocking a motor bends/snaps rods. Doesnt crack sleeves. also if coolant got in there where did it all go? would have been some remnants of coolant. the a/f may have been alright but the timing could have been high.

 

As the guy above said, it's a crap shoot. These cars are not new and probably saw a lot of abuse by previous owners. I had my gsr piston and rod motor (9:1) at 17 psi for a whole year of happiness , one night it gave out on me. I think this has happened to a lot of people. As to the why, I don't know that there is always someone to blame.


With regards to the tuner, I think you would have heard good things about him to let him near your motor, right? Sometimes it is just the luck of the draw!

 

Its always easy to just point the finger at a shop or tuner these days isnt it. What you need to realize that even if it wasnt the tuners fault, this motor probably wouldve went goodbye anyways.

You want something bulletproof? Sleeve your motor this time around and bring it back, or to someone reputable.

Other questions are,

did you compression test this motor?
what kind of fuel were you using?
how old was the fuel?

 

Please tell me where im pointing fingers at the tuner? Im not pointing any fingers....

compression was 225 in all 4 cylinders, 93 octane and the fuel was fresh from the pump....

 

i will be checking out the maps as soon as my datalogging cable comes in

 

have a nice day

 

ive seen gsr cracks sleeves, and i mean completly demolish and shatter them. and they were bonestock

 

Maybe this block had suffered quite a lot of det in the past when it was NA causing the sleeves to fatigue ? ?

 

At only 300whp cracking a sleeve is a tuner issue

 

Not true what so ever. What i mentioned above is one possibility. If he'd had seen enough det at 300whp to crack a liner then i'm pretty sure they'd be tell tail signs on the pistons/plugs.

 

Post up some pics of the plugs, that should tell alittle about the tune.

 

X2... Post up timing map

 

take out that piston and look for broken ring lands to see if detonation was a culprit

 

It may not be the tuners fault, hard to say at this point. If his theory is correct, you'd generally see a bunch of coolant pooled on top of the piston when you took the head off. If it was coolant that got in there around a leaky headgasket, the rod for that cylinder should also be bent. Take a close look at the top of that piston and see if it looks like it was sand blasted, especially around the edges of the piston, towards the cracked area. There should be some evidence of detonation there. How do all your plugs look? a good clear picture of those can tell a lot about the tune as well.