Technical > Matt Shaff's Engine Shop

Piston ring end gap.

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George:
Thanks again. I will do some checking.

dreracecar:
Save your money and dont go with the the TS

Once the standard rings heat and expand the gap closes off to almost nothing anyway.  Couple that with the piston speed during stroke and the other rings on the piston there isnt anything going past them.
 On a asperated engine where you require the piston to draw air into the cumbustion chamber, then OK, every little bit helps, But a blower fills the chamber and that extra draw (however minute) is meaningless.
 Akerly & Childs Dura-Moly ring package is the best bang for the buck

masracingtd1167:
I don'd think there is any magic in running tighter gaps . My motor is not supercharged and I run .028 and 0.30 end gaps and it always leaks down at 2 to 4 percent . On my sons big block with nitrous he runs the gaps at .040 with no issues .

George:

--- Quote from: masracingtd1167 on January 20, 2016, 11:53:03 AM ---I don'd think there is any magic in running tighter gaps . My motor is not supercharged and I run .028 and 0.30 end gaps and it always leaks down at 2 to 4 percent . On my sons big block with nitrous he runs the gaps at .040 with no issues .

--- End quote ---

My concerns are in the fact I run a filled iron block and iron heads with no coolant and looking to see what builders are setting the gaps at for this kind of build. I haven't had any issues but I'm always looking to learn something. Thanks. George

coupemerc:
I would recommend going with the ring manufacturer's recommendation as a minimum. On my deal I just multiplied the recommended gap/inch of bore by the bore diameter and rounded up to the nearest thousandth of an inch. That was the minimum number I filed to. I used zero gap C&A second rings on my old blown alcohol engine and I can't say that they made any more power but they certainly give you real low leak down numbers when hot.

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