Bike wont go ? A simple checklist to work through

[Aitch]

Avgas is 100-120 octane petrol.

Kerosine is jet fuel.

so what's race gas?

[scumdog]

so what's race gas?

Simply avgas that has suffered minor contamination of fallen off in quality.
It has to be 100% dependable for aircraft eh!

Ya can't cough, splutter and pull to the side of the road up in the skies eh?

[James Deuce]

so what's race gas?

FIM mandated race gas is 98 Octane Pump gas with a limited amount of additives. It isn't the noxious eye melting stuff of the '80s.

Petrol is for suck/bang/blow engines that have a metered fuel/air ratio that creates a compressible mixture.

Jet's just need stuff that will burn. Kerosine is good in turbojets.

Diesel is making a comeback in aviation circles for prop aircraft too. Junkers Ju86 was a 40,000 ft recon aircraft designed in 1936 with diesel engines. Aircraft guys love diesel because it doesn't burn easily, and doesn't usually explode the way refined petroleum spirits does.

Some piston engines were running 150 octane fuel at the end of WWII. This gave liquid cooled 37 litre V12 engines like the Griffon 101 used in the Supermarine Spiteful an output of 2400HP at full boost. That's a mere 64HP/litre. Compare that to a late 80s two stroke in the RGV250 at 200HP/litre. 50HP from 250cc. Or the claimed 120HP from my 600 at the same 200HP/litre. We've learned stuff since then.

[DogBreath]

Simply avgas that has suffered minor contamination of fallen off in quality.
It has to be 100% dependable for aircraft eh!

Ya can't cough, splutter and pull to the side of the road up in the skies eh?

Once, once only