Large rpm drop

yellow rose said

I hope your CR is that high. I'm also a bit leery of using a claimed number for valve notch volume. I've never measure them where they weren't at least 2 CC's bigger than advertised.

Click to expand...

That's interesting info, YR.... Curious: Is that from measuring the actual eyebrows or some total volume and assuming the difference is in the eyebrows? I measured some eyebrows but not on a KB or Icon. And I always add in 1 cc anyway for the volume down by the top of the piston. If Charles piston eyebrows are 2 cc larger (than the 5 cc published number), then he should be right around 10.5 for SCR... so still pretty good.

(FWIW... I assumed 110LSA and 106 ICL in my DCR number.... just because they are pretty common factory grind numbers.)