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Old 09-08-2002, 07:44 PM
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Post Piston Ring Spacing

Where can I find info on proper spacing piston rings for 350.

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Old 09-08-2002, 10:55 PM
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You want a dimension between ring grooves? What is the ring thickness? Steel(moly) or cast iron? You need a deck height for the top ring also?

Need more info.

Are you considering an ultrathin ring like 2mm thick?
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Old 09-09-2002, 06:28 AM
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Am assuming that you are referring to the spacing of the gaps, when installing the rings? This is usually specified in repair manuals, but it is pretty simple and straight-forward. Top groove ring gap should be situated about 30 to 45 degrees away from the pin hole, 2nd groove should be 180 degrees (opposite from) the top groove. Oil ring rails should be 90 degrees from the pin and 180 degrees from each other. The oil ring expander can be placed just about anywhere, however the point where the expancer comes together should be away from the rail gaps. Hope this helps.
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Old 09-09-2002, 06:34 AM
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If you are spec'ing custom pistons and are referring to the spacing between the ring grooves, then you will need to provide more information. Hypereutectic pistons absorb much more heat in the crown, than cast and forged pieces do. Therefore the top groove is a little further down on that type of piston. Unless you are building a stroker or a long rod engine, best bet is to go with the piston manufacturer's standard spacing.
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Old 09-09-2002, 06:38 AM
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Sorry if I wasn't complete on what I was looking for.

Yes the spacing of the gaps is what I need.

Thanks engineguy thats the info I was looking for I have a manual that shows spacing for an in-line 6 chev. and wasn't sure if it would be different.
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