[TR] egr valve

[Jim Muller]

On 9 Dec 2007 at 4:27, john doe wrote:

> does the egr valve have any real purpose or can it be blancked off

That depends on how well the rest of your emissions control system 
works.  Those systems had to manage a tradeoff between unburned 
hydrocarbons, CO, and NOx.  IIRC, running lean would reduce CO, but 
NOx would go up.  EGR was intended to reduce combustion temperatures 
to lower NOx.  A pump also dumped air into the exhaust to help the 
catalyst take care of any unburned HC's.  If the rest of your 
emission system still works as intended you should leave the EGR in 
place.  On the other hand, there's no point running it if it doesn't 
work.  Maybe you can test the exhaust with it and without it, see 
what difference it makes, then decide.

Just my opinion.  I'm sure others will be able to provide more 
insight.  I value clean air.


-- 
Jim Muller
jimmuller at rcn.com
'80 Spitfire, '70 GT6+