Tuning O2sensor Knock Sensor Engine Damage

[Espen Hilde]

I think more oktan means less power,if you raise the ignition advance to
compensate for slower burning,it will result in more negative back pressure
on piston top.
Longer combustion prosess,results in more heat transfered to cooling system
If you raise the compression and use same advance as before with avgas
then I belive the engine will develop more power.(It will depend on how
high advance that is needed.)Maybe it is possible to decide what octan to
use
from total advance?

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> From: Squash <mpc at genevaonline.com>
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: Tuning  O2sensor Knock Sensor Engine Damage
> Date: 10. februar 1998 22:23
> 
> > This sounds suspect. My street car (10.4:1 compression) detonates
> > just a touch at WOT on 93 octane. If what you are saying is true, I
> > would loose torque (and therefore power) if I ran AVGAS.
> > 
> > I don't believe this for a second, what's your source for this
> > information?. Who's R&D?
> 
> I think what he means is that peak efficiency for that octane of gas. 
> Higher octane fuel is slower burning, and will take more ignition
> advance.  More advance, more power.  With higher octane fuel, that point
> of detonation usually goes up.  That leaves a little more room for
> ignition advance.  
> -- 
> Andy Quaas