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post #1 of (permalink) Old 06-07-2003, 09:50 AM Thread Starter
 
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EGR Valve blocked off. Problem?

Well,
I got my intake with my weber from Sarge.
Still not running right, but its not because of the Carb or intake.

My ignition timing changed on me. ??

But while I was tracking dowm why, I noticed that the pacesetter headers I have block of the EGR inlet from the exhaust. I noticed the thorley headers have a small pipe that feeds back into the head. I do NOT have that.

Am I correct in assuming this is where the EGR gets its exhaust. ?

And how important is this to the correct running? Could this be the reason my exhaust temps are skyrocketing when I get the timimg straightend out. I THINK I saw one of the header pipes actually turn red. I turned it off ASAP.

I am running a 272 cam and nothing else much besides the weber.

Thanks
Alex
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post #2 of (permalink) Old 06-07-2003, 01:35 PM Thread Starter
 
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Re: EGR Valve blocked off. Problem?

Anyone? I was hoping to get her on the road this weekend.

Alex
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post #3 of (permalink) Old 06-07-2003, 02:11 PM
 
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Re: EGR Valve blocked off. Problem?

If your egr is blocked off on the intake it shouldnt matter...I run a DT header and yes it has a small tube running to the hole in the head that goes to the egr but if your egr is blocked off it shouldnt matter if your header has the tube or not....If your exhaust is running hot,be sure the carb is not running too lean.
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post #4 of (permalink) Old 06-07-2003, 02:27 PM Thread Starter
 
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Re: EGR Valve blocked off. Problem?

I dont think Sarge blocked off my EGR. Is this going to run me into trouble.

I know the EGR helps keep combustion chamber temps down.

Alex
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post #5 of (permalink) Old 06-07-2003, 02:41 PM
 
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Re: EGR Valve blocked off. Problem?

Might be a better question for Sarge....he set mine up for me too....see what he thinks about it.
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post #6 of (permalink) Old 06-07-2003, 02:49 PM
 
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Re: EGR Valve blocked off. Problem?

Short answer - No, the EGR is not a factor in your problem. Look elswhere. For a bit of schoolin' read on:

The EGR introduces "dead air"
(air not charged with alot of oxygen and what should be zero fuel since it is now officially exhaust)
from your exhaust manifold into the intake manifold.

What this does is:
1. Cause your engine to run cooler since you are not giving the cylinder the entire shot of air and fuel.
(This causes a dramatic drop in certain emmissions but at the cost of...)
2. Loss of power.
(It effectively makes your engine smaller since the cylinder size can not be completely utilized due to the "dead air" introduced into the cylinders.)

When the throttle is open more than a little, the EGR valve begins to introduce the "dead air". Personaly, I think that is crap. Because if I am not getting the power I desire at half open throttle, I open the throttle more until I do. In other words, I am burning the exact same amount of fuel to achieve the desired performance. F- the smog nazzis.
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