Forgged pistons?
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This is a discussion on Forgged pistons? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I have a 2011 wrx with 51000 miles and this is the second time of failed ring land and cracked ...

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    Forgged pistons?

    I have a 2011 wrx with 51000 miles and this is the second time of failed ring land and cracked piston. What could be the cause and would forged pistons fix the problem? Mods are Cobb catted dp, cobb sf intake, Cobb ebcs, and turbo smart bov

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    The Jedi Ninja TownLine500's Avatar
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    Is your BOV recerculating?
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    Is it tuned?
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    The bov does not recirculate and no I don't launch or flat foot shift. The car is tuned by drunkmann tuning.

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    Village Idiot McBill's Avatar
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    Have you ever data logged to see if there was any knock events? If you rebuilt this time with forged internals I'm sure that would help. However, if you've blown two rindlands in 51k miles then I would suspect the problem is elsewhere.... such as the tune.

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    What makes you think the motor has "failed?"
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    I know the motor has failed because I went for 20 psi to only about 7 and after ther car cools and I crank it up it smokes

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    Village Idiot McBill's Avatar
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    Have you tested cylinder compression?
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    We're trying to do a compression test but the car fires up everytime. How could I keep the car from firing so I can get a accurate reading on the test

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    Village Idiot McBill's Avatar
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    You need to shut down the fuel system. You do this by pulling out the fuel pump relay. Don't forget to hold the gas pedal to the floor when performing the compression test. While doing this you should probably have all four spark plugs removed.
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    zax
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    Quote Originally Posted by Daltonp45 View Post
    I know the motor has failed because I went for 20 psi to only about 7 and after ther car cools and I crank it up it smokes
    That is NOT an appropriate diagnostic. Please take the car to a professional.
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    We did the test and cylinder 4 was only making 60psi and all the others were 120 and 130

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