Piston question, pros come in please.
Piston question, pros come in please. I had a problem recently and I wanted to know from a pro what would cause a Forged Piston to basically melt?
All on the intake side, pistons put in and ran the car for over 5k miles and had been tuned on a dyno. Put down good power but then started to burn oil excessively eventually leading to the car barely running.
Now on all the pistons there melted and melted so badly that you could see the ring and the gap from the piston to the wall.
What would cause this problem?
1. bad tune and running lean or detonating
2. excessive oil consumption?
Any and all help is appreciated.
All on the intake side, pistons put in and ran the car for over 5k miles and had been tuned on a dyno. Put down good power but then started to burn oil excessively eventually leading to the car barely running.
Now on all the pistons there melted and melted so badly that you could see the ring and the gap from the piston to the wall.
What would cause this problem?
1. bad tune and running lean or detonating
2. excessive oil consumption?
Any and all help is appreciated.
they do it on the intake side because when they cut the slash cuts that is the thinnest part of the piston. Forged pistons will melt easily with detonation. ask me how i know lol what material are they 4032 or 2618?
Last edited by Blacknite; Jan 29, 2010 at 08:45 PM. Reason: added link
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Get someone to download your tune to lap top. Bet the timing is to high. Send the picks to LMR!!!!! Worm Boy and Joe should be able to diagnois your problem. That's what three of mine looked like 45 miles from there shop. After the wonderful tune with 27 degrees of timing on a turbo car. But it was just our misfortune I was told. About a $5000.00 dollar misfortune. Tried to get some help on at least a block. Guess we're just a small fish in the sea. No real response. My take me a year but my revenge will come. Do your home work on the tuner, some of them are cocky and think they have some top secret knowlege. After you get to checking there are alot better ones out there.
Tuner stated it wasnt his fault and it was the fault of the piston installer. I dont see how installing the pistons correctly would cause any problems. Tuner would not pay for new pistons or help out in any way. The new builder will help out and take care of everything.
Get someone to download your tune to lap top. Bet the timing is to high. Send the picks to LMR!!!!! Worm Boy and Joe should be able to diagnois your problem. That's what three of mine looked like 45 miles from there shop. After the wonderful tune with 27 degrees of timing on a turbo car. But it was just our misfortune I was told. About a $5000.00 dollar misfortune. Tried to get some help on at least a block. Guess we're just a small fish in the sea. No real response. My take me a year but my revenge will come. Do your home work on the tuner, some of them are cocky and think they have some top secret knowlege. After you get to checking there are alot better ones out there.
Tuner tried making excuses all day long.But neglected to mention that was his first cobalt SS tune.Before it started blowing oil by the rings after the 255 FWHP dyno he couldnt even get it to idle without surging.Customer was very unhappy.
The pictures look a lot like a bad tune, like the pistons basically overheated and melted down the ringlands, causing the oiling issues. The damage in the last two pics around the valve reliefs are tell tale signs. Typically, detonation will show large clean spots, or even small indentions where the charge literally exploded over the face of the piston, which seems to be evident in the last two pics.
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Lets get real here....alot of things could cause this. IF you are not running a wide band how do you know your fuel pressure wasn't low and you were running lean!
Stop trying to blame everyone for your poor setup.
If you had the proper tools in the car to run on the edge this would NOt have happened.
The pistons got hot and melted, no brainer there dood. Either it was BANGING and knocking from too much timing or running lean from not enough fuel.
Either one is a no brainer, you don't stay in it while the engine is knocking and pinging unless you want to replace pistons everytime you run.
Geez this thread is just redicules!
Hey look i melted my pistons with a torch...what do you think caused it?
Stop trying to blame everyone for your poor setup.
If you had the proper tools in the car to run on the edge this would NOt have happened.
The pistons got hot and melted, no brainer there dood. Either it was BANGING and knocking from too much timing or running lean from not enough fuel.
Either one is a no brainer, you don't stay in it while the engine is knocking and pinging unless you want to replace pistons everytime you run.
Geez this thread is just redicules!
Hey look i melted my pistons with a torch...what do you think caused it?
Could you give us a little more info on why it had to be rebuilt and how you rebuilt it?
Lets get real here....alot of things could cause this. IF you are not running a wide band how do you know your fuel pressure wasn't low and you were running lean!
Stop trying to blame everyone for your poor setup.
If you had the proper tools in the car to run on the edge this would NOt have happened.
The pistons got hot and melted, no brainer there dood. Either it was BANGING and knocking from too much timing or running lean from not enough fuel.
Either one is a no brainer, you don't stay in it while the engine is knocking and pinging unless you want to replace pistons everytime you run.
Geez this thread is just redicules!
Hey look i melted my pistons with a torch...what do you think caused it?
Stop trying to blame everyone for your poor setup.
If you had the proper tools in the car to run on the edge this would NOt have happened.
The pistons got hot and melted, no brainer there dood. Either it was BANGING and knocking from too much timing or running lean from not enough fuel.
Either one is a no brainer, you don't stay in it while the engine is knocking and pinging unless you want to replace pistons everytime you run.
Geez this thread is just redicules!
Hey look i melted my pistons with a torch...what do you think caused it?
Wow your not very smart. The car had plenty of fuel, larger pump and larger injectors so dont give me that **** of not enough fuel. Car was DYNO TUNED with a WIDEBAND and all this happend after that, car was supposed to be fully dialed in but it wasnt. Obviously.
He knows how to build motors been doing it for over 17 years and his personal car puts down 969hp and 932tq on his tune and has ran trouble free for over 2 years. I dont doubt his building abilities as there are 3 other cars here that he built at the same power level.
Same tuner tuned it and we upped the boost, car damaged stock pistons. All he did was install the forged pistons and new rings in the motor, made sure everything was checked out so there were no other problems.
He knows how to build motors been doing it for over 17 years and his personal car puts down 969hp and 932tq on his tune and has ran trouble free for over 2 years. I dont doubt his building abilities as there are 3 other cars here that he built at the same power level.
He knows how to build motors been doing it for over 17 years and his personal car puts down 969hp and 932tq on his tune and has ran trouble free for over 2 years. I dont doubt his building abilities as there are 3 other cars here that he built at the same power level.
Is it true the oiling problem was prior to the pistons burning up, and that the oiling issue even caused a catalytic converter to clog up?
I don't know this guy, and how long he has been building engines doesn't really mean much. I'm not saying he screwed up and is an idiot, but I'm not saying he didn't or isn't either.