<VV> Head milling, Increasing "Squish"

[Matt Nall]

What is done:

the  area between the  "Step"  in "closed chamber" heads [ 95/110, etc.]  is 
moved closer to the Piston top...approx. 0.045"  minimum by  removing some 
of the  head gasket register..typical for increasing Compression ratio....

THEN  the  heads  "pocket"  is enlarged [ ground out] to get the  Volume 
back to original.......now you can run regular..usually...

Mark,  your "dieseling" on shutdown has nothing to do with this process..... 
may be due to HOW  your heads were done....they left sharp edges..which 
become hotspots....which, like carbon deposits, causes dieseling at 
shutdown?

BUT  your idle mixtures may be too lean..your idle speed too high.....your 
timing retarded....all the "Normal causes on a normal engine"

Note:  GM  did it!! you could add " idle fuel cutoff solinoids" that STOPS 
ALL  fuel when the ignition is turned off...

I've seen it done where the solinoid is used as the Idle Mixture 
Needle...just takes solinoids with a shaft that is long enough...and I do 
not remember where they got them.

Matt Nall
All Vairs!.
http://members.aol.com/patiomatt
Lots of Corvair Technical info!

----- Original Message ----- 
From: "Mark Corbin" <airvair at earthlink.net>
To: <corvairduval at cox.net>; <bars84crx at hotmail.com>; 
<virtualvairs at corvair.org>
Sent: Wednesday, September 12, 2007 1:24 PM
Subject: <VV> Head milling, was: PG Turbos??


> FYI, tried that on one of my cars. STILL can't use regular gas without
> encountering MUCHOS GRANDIS dieseling upon shutdown.