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Old 12-22-2010, 06:27 AM   #1
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smog pump removal

My smog pump is on a belt by its self. What would happen if I just removed the belt & left everything else. 454 w/carb
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Old 12-22-2010, 07:21 AM   #2
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My smog pump is on a belt by its self. What would happen if I just removed the belt & left everything else. 454 w/carb
I think we need more information as to year of the engine and what else is on it as far as emission controls. I have done that mod on quite a few Fords but none later then a mid '80's with carbs and very simple emissions equipment.

And before someone else jumps in - yes, I know that it's illegal!!!!! In some states, no big deal!!
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Old 12-22-2010, 11:05 AM   #3
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Smog pump is on 1988 454 w/carb, 31 ft. coachman classic with no c/converter.
no computer. Thanks
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Old 12-22-2010, 11:35 AM   #4
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Smog pump is on 1988 454 w/carb, 31 ft. coachman classic with no c/converter.
no computer. Thanks
This possibly makes the engine something like an '86 or '87 as the RV builders seem to drag their feet.

I would remove the pump, all of the air injection plumbing, the EGR and probably a bunch of the vacuum system. So far it's easy, but depending on the carb and the ignition system, you might have to replace them both. The carb may be a Holley, but most likely is a Quadra Jet on a GM. A Holley possibly can be built into a "no smogger" with after market parts, the other - ?? If you switch to another brand carb, then you are confronted with either an adapter or a new intake manifold The distributor can probably be rebuilt to pre emissions curves, but replacement HEI distributors are fairly inexpensive from various on line sources.

Once you get all of this done - the end results probably aren't going to make you happy after spending a fair amount of time and bucks. You performance and fuel economy will probably not have been helped - you still have that emissions camshaft, low compression heads, and an exhaust that is choking the engine. If you have to change carbs to say a Holley, it will be in the 750cfm range for a 454. The front two barrels are huge in comparison to the Quadra Jet which takes its performance from the very large rears and tiny fronts. Your volumetric efficiency - gone.

Why not consider a replacement GM crate engine - yep - expensive, but the performance will be where you are looking for it and a LOT cheaper then a new MH: https://store.gmperformanceparts.com/store/SelectProd.do?prodId=7757&redir=true&manufacturer= GM&category=Engines&name=HT502%20Truck%20Replaceme nt%20Engine%20&model=%3C!--88890534--%3E
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Old 12-22-2010, 11:58 AM   #5
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Keep the pump, leave the crate engine, spend your money on camping/traveling. How fast are you really going to drive that MH? 55-70, my '88 does that easily, with California smog.
J
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Old 12-22-2010, 12:01 PM   #6
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Keep the pump, leave the crate engine, spend your money on camping/traveling. How fast are you really going to drive that MH? 55-70, my '88 does that easily, with California smog.
J
That's NOT an answer to his question!!!
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Old 12-22-2010, 12:34 PM   #7
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Neither one of us did. A $10,000 upgrade, just leave it alone, it's not broken. Enjoy the 454 as it is. When you sell it, the smog stuff may be needed. Like if you sell it on EBAY and a CALLY buyer wins it.
J
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Old 12-22-2010, 12:43 PM   #8
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My smog pump is on a belt by its self. What would happen if I just removed the belt & left everything else. 454 w/carb
I think the simple answer to your exact question is that within not too much time the pump will seize since you are not removing anything except the belt.
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Old 12-22-2010, 01:14 PM   #9
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My smog pump is on a belt by its self. What would happen if I just removed the belt & left everything else. 454 w/carb
The AIR check valves will not have cool air running through them, so they will soon burn out and cause an exhaust leak. If the pump still works I would recommend to just leave it hooked up.
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Old 12-22-2010, 01:23 PM   #10
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if you want you can remove every thing plug manifolds whete air pipes enter as your in texas you dont get the exaust sniffed on a 1984 i left mine on even when i installed headers it cant rob thet much power
dave
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Old 12-22-2010, 04:25 PM   #11
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Thanks everyone, at this point I think I will leave the smog pump connected.
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Old 12-23-2010, 10:02 AM   #12
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The A.I.R. pump (Air Injection Reaction) was the first exhaust gas emission clean up device invented, and it removed Approx 90 % of the smog producing gases. It's first application was the 1966 model year for California.

On this MH application it will pull approx .25 to 2.0 hp. including belt loss.

If the pump dies and you can't get a replacement. You can remove the pump , management valve, check valves and injection tube. Plug the holes in exhaust manifold. No other change to the fuel system is required, as the AIR system is a after combustion clean up process.

Keeping the pump should make you emission legal!!!
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