Do I need smog pump?
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Mountain Pass
Joined: Oct 2017
Posts: 231
Likes: 16
From: Bismarck ND
Do I need smog pump?
1993 F250 460 5 speed.
I've read countless posts saying that removing the air injection pump won't affect engine operation, but that is not my question. I'm wondering why newer vehicles don't use air injection to help their cats? I don't want to pollute more than necessary (I realize the irony in driving a big block!), but I would really like to get some of that junk out of the engine bay. Are new cats designed to work efficiently without air injection? I plan on going with a high flow cat when I get my exhaust put together, so hoping I can get rid of the smog pump.
Thanks.
- Joe
I've read countless posts saying that removing the air injection pump won't affect engine operation, but that is not my question. I'm wondering why newer vehicles don't use air injection to help their cats? I don't want to pollute more than necessary (I realize the irony in driving a big block!), but I would really like to get some of that junk out of the engine bay. Are new cats designed to work efficiently without air injection? I plan on going with a high flow cat when I get my exhaust put together, so hoping I can get rid of the smog pump.
Thanks.
- Joe
Freshman User
Joined: Mar 2012
Posts: 47
Likes: 0
From: Oregon
My understanding is that it has to do with the improvements in catalytic converter design and overall emissions/combustion control over the years.
Tuned
Joined: Apr 2007
Posts: 372
Likes: 14
From: Central Minnesota
Newer generation engines have totally redesigned heads/combustion chambers that are much more efficient. Our ol push rod V-8s are 50s and 60s designs and the typical wedge shaped chamber cannot burn efficiently for emission purposes. The smog pump simply blows on the hot exhaust gasses, like blowing on a glowing match, getting a bit more burn out of them. The whole system is external from the engine, plumbed on top of the engine (not integral). I removed mine from my 460 to see the engine, I can actually change plugs on the right bank etc. Took the mounting bracket off, cut off and cleaned up the area where the pump mounted and plugged the heads that the gulp valves came out of. Love it. I live rural, my truck is never in city traffic, where it's inefficient. I've got a pump here off a 97 460 with 60K on it you can have for the postage if you need one.
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
Modern 3-way converters do not need the extra oxygen to light off quicker when cold like the old ones did.
As long as you do not have to pass a visual inspection removing the air injection system will work fine with your new converter.
As long as you do not have to pass a visual inspection removing the air injection system will work fine with your new converter.
Thread Starter
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Mountain Pass
Joined: Oct 2017
Posts: 231
Likes: 16
From: Bismarck ND
Can you please explain what a 3-way converter is? I haven't heard that term before. Another question: will my exhaust without an air pump and with a modern converter pollute more or less than the factory 1993 system? I'm trying to maximize power and efficiency while still minimizing pollution.
Thanks.
- Joe
Fleet Owner
Joined: Oct 2005
Posts: 20,785
Likes: 1,751
From: Kentucky
https://www.explainthatstuff.com/cat...onverters.html
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