5 replies to this topic

[lawn bowls]

what should the ring gap be for a boosted holden 6 is going to be 18psi.

[Big_Red]

Check with the piston manufacturer. There are basic calculations for bore size to application.

[axistr]

Three thousands of an inch .003" for every inch of bore size used to be the common gap. I generally like to see an extra one or two thousands for the top ring if subject to extra cylinder temps from boosting. As said above the piston/ring manufacturer should be able to give you good guidelines.

[EunUCh]

blog.wiseco.com/everything-you-need-to-know-about-ring-gap

Bit of a list in this article that should be a good guide to start with.

Edited by EunUCh, 12 January 2020 - 07:43 AM.

[lawn bowls]

thanks for the replys i found out for 18psi its 15 thou

[TK383]

God no, give it .020" top & .022" second.
A bit more hurts nothing, not quite enough will destroy the motor - assume worst case, motor may get hot, may get a bad batch of fuel, whatever.
I ran my turbo 308 with .028/.032" ring gaps.