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

[tom zimmermann]

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

> -----Original Message-----
> From: virtualvairs-bounces at corvair.org 
> [mailto:virtualvairs-bounces at corvair.org] On Behalf Of 
> JVHRoberts at aol.com
> Sent: Wednesday, June 22, 2005 4:10 PM
> To: s10birdman1966 at yahoo.com
> Cc: virtualvairs at corvair.org
> Subject: Re: re; egr's
> 
> 
> 
> All the ones I have seen need vacuum to open, and seat when 
> it's not there, 
> as in WOT operation. The idea of an EGR is to reduce peak 
> combustion chamber 
> temps during the lion's share of an engine's operation, which 
> is cruise. 
> 
> In a message dated 6/22/2005 8:17:22 A.M. Eastern Standard Time, 
> s10birdman1966 at yahoo.com writes:
> 
> ...No,J,egr valves work/open ABOVE say,2,000 rpm,and only 
> after the motors' 
> up to temp,that's when a motors more likely to detonate/ping
> 
> 
> 
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