do i run race fuel?

[vbanshee]

so i have a motor with stock jugs just bored to 65mm i run 19cc domes on my pro design cool head. am i supposed to run race gas? if so what octane?

[J-Madd]

Depends on your elevation; but most likely yes. At least 100 octane, maybe more. Do a compression test.

[bansheesrtoys]

u shouldn't have to with 19cc but it will give u better thottle response.

[jasons]

he rides Glamis so its about sea level. the NOSS website says with 19cc domes compression should be approx 183 psi i would run avgas 100ll.

[TNTS355]

I think anything above 160psi should be running race.

[06specialedition]

I think anything above 160psi should be running race.

 

X2. 160-170 is about the max I would go without race fuel

[firebanshee]

I think 20cc domes @ sea level is pushing it for race fuel.imo

[AKheathen]

i think 20cc domes asl ran awesome on 90 oct. actually......but stock timing...

[shoopie]

i have the same thing, 19cc domes in a pro design head. i have 180psi in each cylinder. i run at sea level and i have been running VP c12 rase gas. its around 108 octane.

Edited November 18, 2010 by shoopie

[Darthwall]

without compresion test you never know 160 comp and below run 92 but 165 and above start mixing 110 and 92 atleast

[AKheathen]

without compresion test you never know 160 comp and below run 92 but 165 and above start mixing 110 and 92 atleast

actually...if you really want to know, you need to figure out what kind of dynamic compression, and other variables........93 can start to detonate anywhere between 140psi and 190psi, really.....

[midlifecrisis]

Im at about 200' and run 92 no problem.