Quote:
Originally Posted by Tom Vaught
Key Point.......... I retired 5 years ago.
............I measured Swirl & Tumble and a lot of other things in my Research job.
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Has it been that long?...!!!
Let's assume PMD totally researched Intake/Runner/valve/chamber/piston Shapes and got the IDEAL design in the EARLY 60s. Just assume. Balanced mixture distro/HP/ acceleration/ and winning. Lets assume the optimal total Advance was 34 Degrees.
Later on, Closed Chamber went to open chamber, and boom: 34 degrees Total ADV was re-attained.
Fuels have changed, yet the optimal kernel chemisry remains a aero-mechanical effort.
Then any MIXTURE improvements (shapes/swirl/atomizations) would yield a leaner carb JET for best performance. Also the Total Advance would go down due to optimixed kernel chemistry.
I run 32 degrees for best results. Wonder if anybody has best results <32*.