Turbo Charge air temps?

[modrmk]

At what charge air temperature would one start to see detonation on pump gas? Basically, what temp. is to high on the charge temps?

 

[devilrmk]

Very complex question.

depends on octane of fuel, engine compression, head design, A/F ratio.


Better question is how much more octane is needed to keep from detonating per say every 10 degree raise in charge temps.

 

[modrmk]

OK, 91 octane, Polaris 800 Dragon with 2010 updated head and pistons, have not checked the compression though. Any ballpark #'s on the temperature?

 

[Super Dave3]

OK, 91 octane, Polaris 800 Dragon with 2010 updated head and pistons, have not checked the compression though. Any ballpark #'s on the temperature?

I would guess that anything over 150 degrees could induce some det issues. On my pump gas mini innercooler setup, I havent seen anything over 110 degrees.

 

[modrmk]

At what psi is that at? I have seen 255 deg. at 8 pounds. 9000 ft elevation.

 

[Super Dave3]

At what psi is that at? I have seen 255 deg. at 8 pounds. 9000 ft elevation.

Boost at 7.5 lbs, 7000 ft elevation.

 

[rymo84]

i have seen 255 deg. at 10psi at 10000ft, no innercooler.
thats on a long pull in deep pow. thinking about making a better cold air intake.
i think the bd box and temp sensor only goes to 255 deg.