EGR-pro and con?
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Junior User
Joined: Oct 2015
Posts: 69
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EGR-pro and con?
I have read mention that the EGR actually can help fuel economy. It also would seem to help warm up the engine in cold weather. On the flip side of the coin, EGR is not known for boosting power output due to higher charge temps and introducing a non volatile mixture to the combustion chambers. Does anyone have any interesting insights concerning the advantages and disadvantages of EGR use? Particularly with a non computerized vehicle.
Fleet Mechanic
Joined: Nov 2002
Posts: 1,643
Likes: 69
If it came factory supplied I would use it. But I don't go out of my way to use it on my hot rods. The factory fuel and spark curves are optimized for EGR, using the factory intake and exhaust systems.
EGR is not functioning when the engine is running at WOT
EGR is not functioning when the engine is running at WOT
Fleet Mechanic
Joined: Jun 2010
Posts: 1,251
Likes: 8
From: North Carolina
Hi there!
Pros of EGR:
1) Allows one to run more timing advance without pinging
2) Makes engine run a bit cooler
3) Is compliant with Federal law
4) Reduces NOx emissions/less pollution
Cons of EGR:
1) If the valve fails in closed position, it doesn't work and you might not even know it failed
2) If the valve fails in an open position, engine idle quality is badly affected
3) Function requires proper regulation so valve opens only when engine rpms are relatively high
4) It takes up a small amount of space near the engine
Pros of EGR:
1) Allows one to run more timing advance without pinging
2) Makes engine run a bit cooler
3) Is compliant with Federal law
4) Reduces NOx emissions/less pollution
Cons of EGR:
1) If the valve fails in closed position, it doesn't work and you might not even know it failed
2) If the valve fails in an open position, engine idle quality is badly affected
3) Function requires proper regulation so valve opens only when engine rpms are relatively high
4) It takes up a small amount of space near the engine
Elder User
Joined: Sep 2014
Posts: 862
Likes: 7
From: like subarctic, brrr man!
When are they supposed to open and close?
I put a DIY efi on mine, and want to hook up the EGR but don't know when it should be open or closed...
And for that matter, I'm going to be adding a Catalytic Converter to this truck of mine which started without one... Trying to go for a Enviro-green truck
Fleet Mechanic
Joined: Nov 2002
Posts: 1,643
Likes: 69
An EGR valve is load-modulated, i.e. exhaust backpressure modulated. You have to have sufficient load on the engine to make it function. The higher the load, the more EGR gas gets delivered. In addition, it does not function at idle and it also cuts out at wide open throttle. Various methods are used to control it depending on the year, carbed or EFI.
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