400 to 451 stroker questions

The gas pressure is only a factor on the firing stroke.
Talk to any of the ring piston/ ring manufactures, and they'll tell you that the radial tension is of significant value.


Who’s arguing? Only YOU. I don’t call it “significant” unless you are comparing a 5/64 ring to a .8 mm ring.

Most ring drag is when the piston is coming up the bore on compression and until cylinder pressure decays below some point I can’t think of right now.

Run a thin ring. And a 1/16 ring isn’t thin.