Hi Octane fuel

Thanks John,

Will have a gander.:)

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Originally Posted by Slunnie

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Yeah, i agree, ATDC sounds waaay late. I got no idea about older engines, but with a stock yamaha r6 engine in a formula SAE car, we run up to 25deg advance at WOT (on 98 octane).

Cheers!

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old Formula Ford 1600 Kent engines require around 45* ignition advance to work at WOT/5-6000RPM.
Poor spark plug placement is the culprit thanks to the flat head and bowl in piston chamber.
It can be overcome to a dgree, but only one engine builder I know ever did. I still have a set of plugs sitting on the shelf ;)

Meyer & Drake/ Offenhauser speedway midget engines, on methanol blend ( 90+%) and 14:1 to 16:1 compression ratio used around 30-35 degrees static advance with no advance/retard mechanism in the magneto.