No4 Posted December 12, 2003 Share Posted December 12, 2003 I found this which for me explained octane rating very well. "An octane rating (87 vs. 89 vs 92, etc.) is a measure of a gasoline's ability to resist detonation, which manifests itself in a pinging or "knocking" noise. Higher numbers indicate that the fuel can be compressed to a higher level before detonation / knock occurs in an engine, which occurs when. As described in "Detonation, Knock, and Pre-Ignition 101", detonation / knock occurs when air and fuel that is ahead of the combustion flame front ignites before the flame front arrives." http://www.superchargersonline.com/content.asp?id=105 I was talking to a guy who used to fly the Super Constellation, DC-6, and DC-7. The 3300 bhp Pratt and Witney radials could only make that power with 150 octane rated avgas, and with 110 could only make 2750 bhp. Quote The Coconut King Link to comment Share on other sites More sharing options...
Jim Sower Posted December 18, 2003 Share Posted December 18, 2003 Yeah. I remember basic training in T-28s we had R-3350s IIRC with 2-stage blowers. We used 115-145 (purple) avgas. It was a neat airplane, but no longer does what we did since you can't get the gas any more. We ran 56" - 60" MAP on takeoff and 36" 2400 RPM on climb. Them was the good old days - when men were men and sheep lived in fear Quote ...Destiny's Plaything... Link to comment Share on other sites More sharing options...
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