What Causes this Piston Damage?
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What Causes this Piston Damage? What do you think is the cause of this piston damage?.
Diamond 2618 forged pistons. NA application. Tuned with 12.8 AFR.
Note; Only pistons # 5 and 7 got damaged. Others were fine. Spark plugs tips were broken and melted.
Diamond 2618 forged pistons. NA application. Tuned with 12.8 AFR.
Note; Only pistons # 5 and 7 got damaged. Others were fine. Spark plugs tips were broken and melted.
Last edited by Denali08; Apr 5, 2010 at 02:57 PM.
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It was running fine for 6-months with same tune. I doubt it is detonation.
I am suspecting a failed injectors on those two damaged pistons or fuel pump.
I am running stock fuel pump and 42# FMS injectors (green top).
I am suspecting a failed injectors on those two damaged pistons or fuel pump.
I am running stock fuel pump and 42# FMS injectors (green top).
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they overheated for some reason, might be fuel injectors screens are dirty or if the timing ignition setting are a little off same thing could happen. Thats why GM's stock tune is rich so this can't happen too easily. You realize at WOT this can happen in an instant, every cylinder is different. Some run much colder than others.
If your tune is on the edge of being lean or too much timing, Its asking for this kind of thing. Even fuel flow etc can cause this if you are always on the edge with the tune.
If your tune is on the edge of being lean or too much timing, Its asking for this kind of thing. Even fuel flow etc can cause this if you are always on the edge with the tune.
Last edited by HotSilverBird; Apr 5, 2010 at 11:05 AM.
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FormerVendor
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From: Houston, Tx.
Detonation and then some damage from the pieces going from cylinder to cylinder through the manifold. Those must be Lunati or something made by Wiseco because no regular Wisecos look like that piston?
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Well, if it is detonation, my tuner is confident it's not the tune.
Could it be failed injectors causing detonation. This is what my tuner is telling
I wasn't driving when it happened. It was a friend driving it.
Could it be failed injectors causing detonation. This is what my tuner is telling
I wasn't driving when it happened. It was a friend driving it.
Looks like the cylinders got a lean air/fuel mixture and drove the combustion temps sky high as witnessed by the obvious melting of the electrodes and pistons. Detonation came in as a result and broke the top of the piston above the top ring. As stated by others, injectors, fuel pressure, etc would be the obvious places to look, if the tune was verified. Any way to verify injector pulse in the computer history?
OP: My guess is that the fuel pump is going south on you. My tune was fine for a while, then I started having to add fuel to the tune every couple months. The stock pump was replaced with a racetronix and even the original tune was way rich. I highly recommend you upgrade the fuel pump before running another engine in the car.
I was trying to determine if it may be a shadow, but it looks like there is excessive clearance there.
OP: My guess is that the fuel pump is going south on you. My tune was fine for a while, then I started having to add fuel to the tune every couple months. The stock pump was replaced with a racetronix and even the original tune was way rich. I highly recommend you upgrade the fuel pump before running another engine in the car.
OP: My guess is that the fuel pump is going south on you. My tune was fine for a while, then I started having to add fuel to the tune every couple months. The stock pump was replaced with a racetronix and even the original tune was way rich. I highly recommend you upgrade the fuel pump before running another engine in the car.
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I was trying to determine if it may be a shadow, but it looks like there is excessive clearance there.
OP: My guess is that the fuel pump is going south on you. My tune was fine for a while, then I started having to add fuel to the tune every couple months. The stock pump was replaced with a racetronix and even the original tune was way rich. I highly recommend you upgrade the fuel pump before running another engine in the car.
OP: My guess is that the fuel pump is going south on you. My tune was fine for a while, then I started having to add fuel to the tune every couple months. The stock pump was replaced with a racetronix and even the original tune was way rich. I highly recommend you upgrade the fuel pump before running another engine in the car.
I agree with fuel pump and I have Holly 255 lph fuel pump ready to install with rebuild. Will check the injectors, too, and retune the PCM.
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I had the same mess from a "FRIEND" driving my car. took number 7 piston out, fuel filter was a little dirty and he ran it WOT too long and BAM!
Good luck, change your pistons, get a new tuner, and move on........
