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Ted Mooney, P.E. RET
Pine Beach, NJ

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944 engine Nikasil coated with OEM Pistons TIN Coated: is this DANGER?

I am considering purchasing a Porsche 944 rebuilt engine with Nikasil Plating of the cylinders. New Porsche OEM pistons were installed. These are Aluminum with a TIN coating. Will I have problems with scoring of the cylinder walls due to the hardness of the TIN? What type of rings should I hope were used? I assume that OEM rings were used, which I don't know what this would be from a 944 engine.

Thanks,

Robin Hood
RHCRC - Olympia, Washington, USA
2004

I haven't seen a cylinder plating line in a while. The last I saw was for tin plating though, and I don't know why that should have to change because of nickel silicon carbide plated cylinders. But in those days cylinders were plain iron and piston rings were chrome plated, and I don't know what the appropriate plating material is for rings that run against nickel silicon carbide.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

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