I am calling BS on that, if you look at the piston velocities of a Pratt 4360, its equivalent to a SBC at 8000+ rpms. Its not about RPM's it about piston speed.....and at 4500 foot above sea level altitude, our regular gas is only 85 octane...oh and 130-145 octane avgas burns slower than 100 low lead. Your continental or Lycoming engine with a 5" stroke has a lot of velocity and is running at 85% power for hours on end, not something that a car engine typically does. Tim

Originally Posted By Challenger 1
Aviation gas is formulated for low rpm engines at higher altitudes and does not have the BTUs race gas can produce. It sure is better than pump 93 octane that's for sure. It has very different specific gravity also that must be accounted for when tuning. [url=http://www.automotiveu.com/racevsav.htm][/url]
Anyone know what this is?

I'm turning 2300 rpm and it's almost redlined on 100LL!
http://i21.photobucket.com/albums/b260/challenger19711/After%2012-8-14/IMG_52541.jpg

Last edited by astjp2; 04/08/15 01:16 AM.
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