<VV> Re: <> Re: re; egr's

[JVHRoberts at aol.com]

Given the nature of these systems, and the fact that Corvair engines  weren't 
inherently designed to be 'smog motors', adding EGR is a headache not  worth 
getting into. There would be little improvement in emissions, and it would  
only add cost, complexity, and probably hurt performance. 
You'd do FAR better adding a catalyst, if clean air is your thing. And  those 
things are probably easier to install!
 
In a message dated 6/23/2005 1:44:17 A.M. Eastern Standard Time,  
s10birdman1966 at yahoo.com writes:

I may  have mis-understood the statement..the GM's and chrys FWD's I'm 
familiar with  use a control solenoid to control vaccum to the egr valve,enabling it 
under  certain conditions;;i've had to replace a few,because they failed to 
close  (like at low/idle speeds),causing the engine to run lousy...these 
systems  could be plumbed to a Corvair engine,but I'm not sure the electronic 
controls  would be easy enough to make it worth-while...besides,this kind of talk is 
 sure to get the 'purists' rattling their sabres...TZ

Jim Burkhard  <burkhard at rochester.rr.com> wrote:  
There  are lots on the market (most all of them nowadays, actually), that
aren't  diaphragm operated like the old "backpressure valves". Most use
linear  stepper motors, but a few use rotary torque motors. In general
though,  John is right. They apply EGR for part load (to reduce NOx and
improve  mpg) and make it go away at full load so as not to hurt  volumetric
efficiency (and thus full load torque).

Jim  Burkhard