EFI Questions

[dzorde]

Hi Bruce,

Its times like this I wish I had a digital camera.  Anyway, cooling temp is
84C (180F thermostat from memory).  I don't think I'm on too much advance
(8deg @1000rpm), although I have never checked what the total advance is at
max rpm.  But I do know anymore and it pings.  The greyness is close to the
light grey used in the Windows menu bars with a brown tint appearing.  I've
tried retarding the timing, which does result in the cars seeming slower to
work its ways through the revs.

But this keeps me getting back to the compression. The fact that the car
won't run properly if I reduce the fuel delivery (even though still reading
rich), could that be due to the extremely high compression ?

Dan     dzorde at soanar.com.au

-----Original Message-----
From:	Bruce Plecan [SMTP:nacelp at bright.net]
Sent:	Saturday, January 30, 1999 3:33 AM
To:	diy_efi at efi332.eng.ohio-state.edu
Subject:	Re: RE:EFI Questions


>Tried the plug cuts.  Looks nice and clean (no detonation) but I already
>know that its OK on avgas.  Plugs are a medium grey, with probably a slight
>browning of the ceramic tip (NGK BP6S plugs).  And yet the car is still
>running very rich (I think around 0.8-0.9V is rich).  So how does a plug
>look like its OK and yet all other indications are that its rich (got me
>puzzled) ?

Depending on the grayness, you might be running too much timing
too rich.  The gray is a sign of a sooty flame, meaning excess fuel,
running extra timing makes the motor seem like it's pulling better.
What for cooling temp ya running?.
Remember, I'm an ocean away and can't see you plugs, and just
trying to work off of what your reporting.
Bruce