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Hi all,

I am new to the forum but had mainly GT4's before. I have bought myself a rev2 3sgte engine with the intention of rebuilding to put in a new mr2 shell.

Anyhow I have been stripping the engine down and I could see oil in one of the exhaust ports. I then got to the pistons and found the attached image

Any thoughts on what could cause this 20200214_205235.jpg 20200214_205235.jpg ?
 

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I do not see any other damage, which would indicate detonation issue. I would guess that the piston material had inclusions in the aluminum substrate in that area. Davew
 

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I would have to agree on the detonation. That is a lot more then a small section of piston top ring land. Now you need to determine if the cause is fuel distribution or timing. Any tell tale signs in the cylinder head or other cylinders. Davew
 
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