they will tell you the same thing wiseco told me when i sent them a set of pistons that were pretty screwed up in my engine.......poor tuning and improper piston to wall clearance and/or installation.

i think they only care to test the hardness of the forgings and how their pistons react to different heat cycles by testing the aluminum. i don't think they will tell you those pistons are a "bad batch".......hopefully they can shed some light on what happened though....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patrick4588 &raquo;</TD></TR><TR><TD CLASS="quote">
</TD></TR></TABLE>

What is the part number on the box? Did you check to see that you have the correct pistons? That seriously looks like mechanical interference/failure.

I have seen an engine slam oil squirters and it didn't do anything near that kind of damage. What crank is in the engine? What do your bearings look like? Take some pics of the bottom of the block.....area around the bottom of the sleeves/squirters.

 

yeah i have the right pistons, they sent me the wrong ones the first time and i had to send them back. i checked the numbers and got the right ones the second time. the oil squirters were fine and not touched. its a gsr crank and my bearings looked fine. ill take some pics for you when i get a chance

 

talked to cp today. they said my pistons were hitting the head. i was using a stock crank and the pistons didnt poke out of the block when it was on the engine stand. im not sure how thats possible.

 

was the crank balanced along with the pistons and rods?

 

crank was micropolished and balanced, but pistons were off the shelf cp's. same with the eagle rods.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patrick4588 &raquo;</TD></TR><TR><TD CLASS="quote">talked to cp today. they said my pistons were hitting the head. i was using a stock crank and the pistons didnt poke out of the block when it was on the engine stand. im not sure how thats possible. </TD></TR></TABLE>

Then why is the damage on the bottom....lol

Was there any damage visible on the bearings?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">

Then why is the damage on the bottom....lol

Was there any damage visible on the bearings?</TD></TR></TABLE>

The only thing that would make sence in that senario would be that there was piston to head contact on the oppisite side, causing the piston to rotate on it's axis & smashing the broken portion of the piston in the cylinder wall, but at that point you would almost have to see scaring on the cylinder wall where it broke.

very odd.

 

well since my head is aluminum, wouldnt the head have severe damage. i would think the pistons would win that battle...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">

Then why is the damage on the bottom....lol

Was there any damage visible on the bearings?</TD></TR></TABLE>

the only damage to the bearings was on one where a piece of broken piston got in there and scraped it up. other than that, no damage.

 

Take some pics of the top of the pistons and the combustion chambers on the head. Also, measure the wrist pin to bottom of the skirt height.

What was the part number on the rods? Are you sure about the crank?

Going back to my first post.....those pistons look like they hit the crank weights.

 

man i need to get a camera at my house. i never get pictures of anything because i have to drive to work and get the cameras. ugh. im not 100% sure what crank it is. i was told it was a gsr, but again, not completely sure. when the motor was on the engine stand, the pistons didnt pop out of the cylinders when i rotated it, and nothing seemed to hit or catch by any means. everything "seemed" ok. i havent looked at the head closely yet, im going to do that when i get off work tomorrow. this sucks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patrick4588 &raquo;</TD></TR><TR><TD CLASS="quote">man i need to get a camera at my house. i never get pictures of anything because i have to drive to work and get the cameras. ugh. im not 100% sure what crank it is. i was told it was a gsr, but again, not completely sure. when the motor was on the engine stand, the pistons didnt pop out of the cylinders when i rotated it, and nothing seemed to hit or catch by any means. everything "seemed" ok. i havent looked at the head closely yet, im going to do that when i get off work tomorrow. this sucks</TD></TR></TABLE>

Sorry to hear about your situation.

I have CPs and Eagles and no issues @ around 3000miles. Glad it got worked out.

 

What were you piston to wall clearances? I have never seen all 4 pistons break like that ever. It has to be a clearance issue...

 

let us know, im with the idea of the skirts hitting the counterwieghts but more info would be great...maybe some more pics!

 

how do u not know what crank you have? sorry to sound like an ******* i dont mean it that way... but how did u go abotu ordering your eagle rods without knowing what crank u have?

 

pistons can break like that if they are hitting the head, but with no pictures is a guessing game to figure anything out... those pics dont show anything.


Modified by mmuller at 12:05 AM 9/23/2008

 

zero deck, a GSR head, stock head gasket, and turbo mean the pistons will hit the head.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DonF &raquo;</TD></TR><TR><TD CLASS="quote">zero deck, a GSR head, stock head gasket, and turbo mean the pistons will hit the head.</TD></TR></TABLE>

what?

 

I believe he means with a block that has been zero decked, Pistons flush with deck surface, stock head gasket, and a closed chamber head this only leaves .027" for rod stretch which is not enough room. I dont see how turbo matters more rod type, and rpm's but yea.. I also find it hard to believe that the damage these pistons have was done by them hitting the head. Take a look at the head it would be very easy to see. If you get time you should post some more pictures as well. Crank and more pistons head etc etc

 

Turbo = more heat = more expansion of the piston in all axis.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Coreymdean &raquo;</TD></TR><TR><TD CLASS="quote">I believe he means with a block that has been zero decked, Pistons flush with deck surface, stock head gasket, and a closed chamber head this only leaves .027" for rod stretch which is not enough room. I dont see how turbo matters more rod type, and rpm's but yea.. I also find it hard to believe that the damage these pistons have was done by them hitting the head. Take a look at the head it would be very easy to see. If you get time you should post some more pictures as well. Crank and more pistons head etc etc</TD></TR></TABLE><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Phil M &raquo;</TD></TR><TR><TD CLASS="quote">Turbo = more heat = more expansion of the piston in all axis. </TD></TR></TABLE>

thanks for explaining so what could the OP have done to avoid this?

 

More piston to head clearance. You should use a thicker head gasket next time. Give that biatch 1mm or 40 thou of clearance to the head.

 

well i dont know if i believe that was the issue i would like to see some more pictures for sure

 

are all the broken piston parts on the exhaust side?