at 140 compression what octane should i run

 

Air or liquid cooled? Timing? Alot of things go into that but you should run super or above.

 

liquid cooled banshee stock timing

 

92+

 

Generally, when you increase compression past a certain level, you need to increase the fuel octane requirement in order to combat detonation.

Detonation occurs when the cylinder pressure is high enough to ignite the end gases without the aid of the spark plug. This usually occurs in the combustion chamber end zones (near the bore edge of the dome). This ignition of the end zone gases will create a shock wave that will travel and collide with the on-coming flame front. It is this collision that will do the damage to your engine.

 

WIth 92 you can safley run up to 160. I have about 155lbs in my blasty, and run 92 fine.

 

What is your timing set at?

 

as far as i know it is stock