The first run was with a 36 tooth rear sprocket at 7,000 rpm and 146 mph. The second run was with a 38 tooth rear at 7,170 rpm and 142 mph. The rev limiter is set at 8,400 rpm and it pulls right up to the limiter on the dyno. It did not do that on the salt. The sensation was like it had a rev limiter set for a much lower rpm. Something was holding it back. 7,170 rpm was all it could do.
The average piston speed at 7,170 rpm is 3,120 fps, the maximum piston speed is 5,030 fps, and the maximum piston acceleration is 83,600 feet per second squared. All too low to cause ring flutter under normal circumstances.
A problem I have is the mixture going rich at high rpm. It is noticeable with non-oxygenated leaded and more of a problem with the heavily oxygenated unleaded. Normally, a bigger air main jet would fix it. I am already using the biggest air main jets for FCRs, a pair of #200s. One project for this year is figuring out a cure for this.
Would the mixture going rich at high rpm cause the oil discoloration?