Smog pump, Cools heads? (engine rebuilders advice)
05-11-2008, 11:09 PM
#1
3rd Gear Member
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Join Date: May 2007
Location: Kansas
Posts: 766
Smog pump, Cools heads? (engine rebuilders advice)
As some of you know, I had the engine rebuilt in my mustang. I'm working on getting it all back in and what not. When I got it, the smog pump was locked up and they had a shorter belt bypassing it. The guy that rebuild my engine said I should get the smog pump hooked back up as it cools the heads. A lot of you on here have smop pump emliminators, or it seems like it. Do I really need it? Will it affect the heads? Will it be ok to have no smog pump? Or should I replace it for the heads sake?
05-12-2008, 12:58 AM
#3
5th Gear Member
Join Date: Jul 2003
Location: United States
Posts: 3,451
RE: Smog pump, Cools heads? (engine rebuilders advice)
Cools the heads off for what...? Smog pumps are ment to push air into the exhaust to help burn unburned fuel. If anything I would assume it would actually make the heads heat up more. In any case I bypassed mine with no problems & still none. You could fix it or remove for weight savings.
05-12-2008, 09:09 AM
#4
2nd Gear Member
Join Date: Sep 2006
Location: ca
Posts: 215
RE: Smog pump, Cools heads? (engine rebuilders advice)
hahaha wow i never heard that one before maybe your mechanic thinks that way cuz its called an"airpump" but no my friend just bypass it and take off all that emissions crap off your engine bay would look alot cleaner
05-12-2008, 01:17 PM
#5
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Join Date: Jan 2007
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Posts: 1,108
RE: Smog pump, Cools heads? (engine rebuilders advice)
That isn't a totally unfounded statement, but he's a bit off. The combustion temp has more to do with the EGR function than the AIR pump. But, on 5.0's the two are directly correlated.
http://en.wikipedia.org/wiki/Egr
I've also heard that eliminating the AIR pump can cause fuel mixture problems because of the lack of expected gases in the system. I'm sure there are guys on here that deal with emissions controls on a professional level that can explain all of that in more detail (or accuracy).
With that being said, I've never had a problem with my car with the AIR pump deleted and the stock EGR left alone. In fact, mine gets freakishly good gas mileage for a 5.0.
Exhaust gas recirculation (EGR) is a NOx emissions reduction technique used in most gasoline and diesel engines. EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Intermixing the incoming air with recirculated exhaust gas dilutes the mix with inert gas, lowering the adiabatic flame temperature and (in diesel engines) reducing the amount of excess oxygen. The exhaust gas also increases the specific heat capacity of the mix lowering the peak combustion temperature. Because NOx formation progresses much faster at high temperatures, EGR serves to limit the generation of NOx. NOx is primarily formed when a mix of nitrogen and oxygen is subjected to high temperatures.
I've also heard that eliminating the AIR pump can cause fuel mixture problems because of the lack of expected gases in the system. I'm sure there are guys on here that deal with emissions controls on a professional level that can explain all of that in more detail (or accuracy).
With that being said, I've never had a problem with my car with the AIR pump deleted and the stock EGR left alone. In fact, mine gets freakishly good gas mileage for a 5.0.
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