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#1 |
Registered Member
Join Date: Mar 2002
Location: bc canada
Posts: 48
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![]() I really dont know what a smog pump is. I have a off road h pipe. should i take the smog pump out?? do i even have one??? 89 5.0 lx hatch maf. Also, has anyone tried enlarging the hole between your stock airbox and the fender???? thanks
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now daddy ran whiskey in a big block dodge 89 5 speed LX 5.0 - off road h pipe, B&M short throw, 13* timing, blue bottle glasspacks, removed air silencer, accel super stock 8mm, bosch platinum 4's, no times |
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#2 |
Registered Member
Join Date: Jun 1999
Location: Columbia Co, PA
Posts: 303
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![]() I'm no emissions expert, but this is my understanding of a smog pump:
It basically just pumps fresh air into your exhaust pipe to help dilute the emissions that get measured on the other end. There's a couple of vacuum operated valves that have some sensors somewhere that control the amount of air pushed to the exhaust. I'm sure all the CA guys have a good handle on emissions. ![]() It won't hurt anything if you leave it hooked to your offroad pipe. You can take it off or leave it on. Be sure to take your belt off and check that it turns freely by hand. Had a buddy replacing a harmonic balancer recently and when he had the belt off, he found that his smog pump was so bound up that it could barely be turned by hand. |
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#3 |
Registered Member
Join Date: Aug 2001
Location: Huntington NY
Posts: 573
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![]() The air pump is used to keep the cats at a good operating temp (to warm them up when you start your car, they work better the hotter they get). If you have no cats (offroad pipe), you don't need it.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out! |
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#4 |
Registered Member
Join Date: Oct 2001
Location: Joosey Shore
Posts: 358
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![]() From what understand, it is the opposite. The smog pump pumps exhaust FROM the H-pipe into the motor. Somehow the fumes are supposed to do some kind of black magic and allow it to burn off un-used fuel or something.
Anyway, you don't need it.....that's all that's important
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1988 5.0 notch: Previously never modified!! ![]() SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods... |
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#5 |
Registered Member
Join Date: Jun 1999
Location: Columbia Co, PA
Posts: 303
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![]() 929
I think the EGR valve is what allows exhaust gases back into the intake. On my car the EGR vlv was connected directly to #3 header tube. |
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#6 |
Registered Member
Join Date: Aug 2001
Location: Huntington NY
Posts: 573
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![]() the air pump pumps exhaust gas from the tubes on the back of your heads down into a valve, then into a tube right before your cats on the h-pipe. Its only mission in life is to get those cats hot
The EGR valve introduces exhaust gas into the intake manifold to reduce oxides of nitrogen (NOx) by reducing peak cylinder temperature and pressure. Unfortunately, high cylinder pressure equals power.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out! Last edited by RPM427; 08-23-2002 at 10:35 AM.. |
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#7 | |
Registered Member
Join Date: Oct 2001
Location: Joosey Shore
Posts: 358
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![]() Quote:
Ah yes, as memory serves me.....you are correct.
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1988 5.0 notch: Previously never modified!! ![]() SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods... |
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#8 | |
Registered Member
Join Date: Oct 2001
Location: Joosey Shore
Posts: 358
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![]() Quote:
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1988 5.0 notch: Previously never modified!! ![]() SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods... |
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#9 |
Guest
Posts: n/a
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![]() Here's what I've always understood the smog pump to do. It pumps fresh air into the hot exhaust which adds some additional oxygen molecules to the carbon mon-oxide resulting in more carbon di-oxide.
There were smog pumps long before Cats, so I'm sure they are not for heating them up. You remove the pump, you get some more power and some more pollution...everything's a trade off. |
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#10 | |
Registered Member
Join Date: Oct 2001
Location: Joosey Shore
Posts: 358
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![]() Quote:
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1988 5.0 notch: Previously never modified!! ![]() SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods... |
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#11 | |
Junior Member
Join Date: Mar 1999
Location: Ventura, California
Posts: 8,981
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![]() Quote:
The smog pump is nothing more than an air pump. It's original purpose was to send fresh air into the exhaust to dilute the emissions, but with the advent of catalytic convertors nearly 30 years ago, their purpose changed. Their purpose is to improve the efficiency of the cats, and, as mentioned, to help them warm up faster. In fact, they play such an important role now, that if you remove the pump without removing the cats, you will clog up your exhaust. Take care, ~Chris
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