So I read that you need higher than 87 (octane of regular gas in va) once you get higher than 12.5CR, which is roughly 180 PSI. (SteveW I think that was you)
anybody have any sort of chart that displays roughly as your CR goes up your octane needs do as well.
I milled some heads yesterday. We had a bike up to 210psi yesterday, but definately started pinging with the 87 that was already in there.
So basically I want to know whatever it is; for example higher than 180psi you need 89; higher than 210 you need 93 etc.