Air Pump Eliminator Kit
Postmaster
Joined: Dec 2007
Posts: 3,052
Likes: 1
From: Jacksonville FL
The smog pump pumps fresh air into the cats to help pass emissions.
I would go with the Auto specialties 025030.
Senior User
Joined: Feb 2006
Posts: 282
Likes: 0
I was afraid I was going to break it trying to get it open. Any tips?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
FTE Chapter Leader
Joined: May 2006
Posts: 11,273
Likes: 100
From: North Dakota
Nope, I had major issues keeping a belt on mine without the bypass pulley.. It worked fine with a new belt, but after 500 miles it would jump.
Senior User
Joined: Dec 2007
Posts: 348
Likes: 1
From: Lutz, FL
I can't speak for anyone else here, but I never heard that. What's the reasoning behind it?
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
I removed the air pump (very noisy) on my '92 F350 w/5.8L engine two years ago. I have been running a shorter belt since then with no issues. I also replaced the tensioner and pulley at the same time.
Senior User
Joined: Nov 2007
Posts: 435
Likes: 0
From: Los Angeles, CA
The catalytic converter starts off as cold, it cannot work effectively. When the cat is cold the AIR pump takes fresh air, pushes it through a dedicated passage in the cylinder heads, and injects it into the cat to heat it.
If the cats are not warm, the cats cannot do their chemical magic, they will not clean the exhaust, it will clog the screen shorting its life and increase back pressure in the exhaust.
The very hot air and the exhaust produce the following reactions:
2NOx → xO2 + N2
2CO + O2 → 2CO2
CxH2x+2 + [(3x+1)/2]O2 → xCO2 + (x+1)H2O
Senior User
Joined: Dec 2007
Posts: 348
Likes: 1
From: Lutz, FL
The hotter the environment, the faster a chemical reaction will take place. The catalyst (platinum) is on a screen in the cat that the exhaust passes thru.
The catalytic converter starts off as cold, it cannot work effectively. When the cat is cold the AIR pump takes fresh air, pushes it through a dedicated passage in the cylinder heads, and injects it into the cat to heat it.
If the cats are not warm, the cats cannot do their chemical magic, they will not clean the exhaust, it will clog the screen shorting its life and increase back pressure in the exhaust.
The very hot air and the exhaust produce the following reactions:
2NOx → xO2 + N2
2CO + O2 → 2CO2
CxH2x+2 + [(3x+1)/2]O2 → xCO2 + (x+1)H2O
The catalytic converter starts off as cold, it cannot work effectively. When the cat is cold the AIR pump takes fresh air, pushes it through a dedicated passage in the cylinder heads, and injects it into the cat to heat it.
If the cats are not warm, the cats cannot do their chemical magic, they will not clean the exhaust, it will clog the screen shorting its life and increase back pressure in the exhaust.
The very hot air and the exhaust produce the following reactions:
2NOx → xO2 + N2
2CO + O2 → 2CO2
CxH2x+2 + [(3x+1)/2]O2 → xCO2 + (x+1)H2O
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New User
Joined: Jan 2011
Posts: 4
Likes: 0
Thank you ross, I think that it would be easier to put a smaller belt on as well. I understand about the cats, I just rebuilt my 351 from the pan up and took all emissions off except for the EGR. Thankfully, hooker makes a header that allows you to run one. I was also able to find the belt routing and size diagrams that you were talking about. It is 84.5''
Freshman User
Joined: Jul 2008
Posts: 29
Likes: 0
From: Tuscaloosa,Al
. My truck doesn't have air pump or cats anymore.
Freshman User
Joined: Feb 2011
Posts: 32
Likes: 0
From: Pensacola, FL
The air pump feeds clean oxygen to fire off the cats and make them burn.
It's like the reason you run oxygen with your acetelyne... It allows it to burn super hot. The cats (ones that are designed to burn with an air pump) must have that oxygen to burn off soot and hydrocarbons trapped in the cat. If the air pump is disabled, the cat will clog up and cause a huge obstruction in the exhaust flow.
It might not happen right away, and performance lost will be over time, so may not be noticeable at first, but the cats will clog up, performance will suffer, and eventually the cats will be ruined and can clog to the point of serious drivability issues.
Freshman User
Joined: Feb 2011
Posts: 32
Likes: 0
From: Pensacola, FL
If the cats are gutted or removed, the air pump is doing absolutely nothing and can be removed. To have an air pump with cats gutted/gone is a total waste of the pump's reason to exist.
