EFI Questions

[Bruce Plecan]

-----Original Message-----
From: dzorde <dzorde at geocities.com>
To: diy_efi at esl.eng.ohio-state.edu <diy_efi at esl.eng.ohio-state.edu>
Date: Sunday, January 31, 1999 8:55 AM
Subject: RE:EFI Questions

Could it be due to the compression,   yes.
I still would first try to measure the performance, and see what changing
the
timing mixture does.
Gray, is soot, soot is lack of O2.  I don't know of anything contrary to
that.
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
>