Piston ring end gap

[Rob25Racing]

I am building a B&S animal motor (methanol). Just wondering what the piston ring end gaps should be. Will I need to get over size rings. I purchased stock ring sets. I am being told that the end gap on stock rings is going to be to big. I have been told that .003-.004 on the top two rings is what I should have. Any info would be appreciated. Anyone know what std ring set has for end gap. Thanks for ant feed back.

 

[DirtyDan]

Clearly depends on the wear in your cylinder.... But I think most stock rings will be in the 8-12 thousands range in a fresh stock bore. Quite a ways from 0.004

Dan

 

[CarlsonMotorsports]

Bottom two rings should be just fine. Top ring needs to be tighter for sure though.
Alcohol engines like low tension rings = a little smoke ain't all bad.

--
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Brian Carlson
Carlson Racing Engines
Vector Cuts
www.CarlsonMotorsports.com
Celebrating 25 years of service to the karting industry
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bcarlson@CarlsonMotorsports.com

 

[jjchat]

Depending on the size of your bore (piston to sidewall clearance) the briggs top ring is oversized. I use to have to file quite a bit off but at some point last year I found they started coming with approx -1 to +.003 end gap already in place.

I do not see a need to use oversize rings.

 

[jjchat]

I shoot for .004-.006 in the top ring.

 

[CarlsonMotorsports]

I like my top ring tighter than that -- but you are right -- if you sort through a few new top rings, you can find one the same bore size that is a bit tighter on end gap.