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

[Jim Burkhard]

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: <VV> 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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