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Engine questions


Doug&Deb

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I’m usually on the car side of the forum since I have a 52 Coronet. I’m rebuilding my first engine which according to the number is from a 58 truck. I don’t have a manual and I’m not sure if there are any differences from the 52 manual. My question concerns piston rings. I’m wondering about the 4th ring that has the u-shaped profile. The other rings have a gap between.010-.012. The 4th ring is a much smaller gap. The 52 manual calls for.007-.015 on all rings. Before I start filing could someone please check on what the 58 truck manual says. Thanks in advance.

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Ring gap is very important in high performance engines.  With High rpm & heat, the rings expand, closes the gap & breaks the ring landings on the piston.

 

Just saying in that case, it is not the piston that failed, it is the too tight ring gap that broke the piston.

I have no idea how critical this is on our 95 hp flathead engines .....I would want to file the rings to specs if up to me.

 

My 1958 Motors auto repair manual shows  .010 for both compression & oil rings.

Edited by Los_Control
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