<VV> Dieseling !

[Brent Covey]

Dieseling is *always* the carbs too far open-

Get the idle speed down (550 or less) and it should cease. Carbon is not
able to cause the problem if you arent feeding it fuel-

Something that you might look at is why the carbs need to be so far open,
for example insufficent initial timing advance (sounds Ok in your case) or
weak idle mixtures, or other issues that weaken idle.

Shutting off Powerglides in Drive Range or stalling the engine with the
clutch a little as you turn it off in manual trans cars usually works, GM
has issues around 1972 with dieseling with some horrorshow emissions
calibrations and used to have either an idle stop solenoid snap the throttle
right tightly closed when you turned the key off, or engaged the a/c
compressor brieifly during shutdown to stall the engine.

Hope thats some help, keep working at it-
Brent Covey
Vancouver BC


----- Original Message -----
From: "Secular" <rusecular at yahoo.com>
To: <virtualvairs at corvair.org>
Sent: Saturday, September 09, 2006 6:26 PM
Subject: <VV> Dieseling !



  What causes dieseling or post ignition and how can it be tamed? - cooler
plugs, advancing/retarding the timing, or .... ?

  My 65 - 140 HP has two brand-new Holley 5200 carburetors. The car's idles
smoothly & is NOT set too high (it idles @ 700 rpm), yet I am experiencing
dieseling almost all the time when I turn off the engine.

  The timing is set at 16 BTDC.

  Could it be carbon deposits? a friend suggested Chevron TECHRON!

  Regards,


  Tony


 _______________________________________________
This message was sent by the VirtualVairs mailing list, all copyrights are
the property
of the writer, please attribute properly. For help,
mailto:vv-help at corvair.org
This list sponsored by the Corvair Society of America,
http://www.corvair.org/
Post messages to: VirtualVairs at corvair.org
Change your options: http://www.vv.corvair.org/mailman/options/virtualvairs
 _______________________________________________