[Diy_efi] The Hunt effect

[dh at busb.com]

Does not change significantly with regard to octane (less than 5%) changes
very significantly with throttle position > 500%.

Don't remember the original post but an engine at WOT has minimum timing and
maximum fuel for a given RPM.  That is to say, the fuel delivery depends on
the RPM and the loop is open.

dh
----- Original Message ----- 
From: "Adam Wade" <espresso_doppio at yahoo.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, October 06, 2005 1:48 AM
Subject: RE: [Diy_efi] The Hunt effect


> --- John Gross <jogross3 at hotmail.com> wrote:
>
> > the flame front speed does NOT change with higher
> > octane,
>
> Does in pump gas, due to all the other restrictions
> that must be met.  Race gas?  Big difference.
>
> > if the engine has a high enough CR that it cannot
> > attain MBT timing on lower octane, you would find a
> > power increase with higher octane from the simple
> > fact that the ECU can put full ignition timing in
> > the motor.  This would be found ONLY under WOT
> > conditions, not part throttle.
>
> How so?  Unless the ignition system does not advance
> the spark to try and achieve MBT under part-throttle
> conditions, there would be an effect at any throttle opening.
>
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>
>
>
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