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Author Topic: Temporary or Permanent Exhaust Repair?  (Read 5366 times)

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Offline ammachine390

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Re: Temporary or Permanent Exhaust Repair?
« Reply #15 on: January 17, 2012, 02:59:03 PM »
Before Cats, it still would have been used to burn the excess fuel in the exhaust. Since carbureted cars tended to run rich, there would be lots of hydrocarbons in the exhaust, that the AIR system would burn to prevent unburned hydrocarbons from entering the atmosphere.

http://en.wikipedia.org/wiki/Secondary_air_injection
Dan
1981 AMC Concord DL 258 Auto

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Offline carnuck

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Re: Temporary or Permanent Exhaust Repair?
« Reply #16 on: January 17, 2012, 03:09:24 PM »
That was the claim back in the day.   :bs: :bs: :bs:
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

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Offline 68AMXGOPAC

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Re: Temporary or Permanent Exhaust Repair?
« Reply #17 on: January 17, 2012, 04:44:01 PM »
I stand corrected  ;D I always thought they just forced air in there to dilute the emissions...but it makes sense....Now I dont feel so bad leaving the pump on my car  ;D
Before cats, that's exactly what the AIR system did. We did testing way back in the late '70s that proved the AIR system was hokum without a cat to feed. It thinned out the emissions so cars passed the sniff test, but they wasted more fuel doing so. You can eliminate the AIR rubbish if you get the correct anerobic aftermarket cat (Random Technologies used to sell them with a diagram that allowed even snotty CARB inspectors pass them)
I think I would second that, because my 73 Javalin/AMX had the pump and had all those little tubes to each exhaust manifold runner, and no Cat.
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Offline BenM

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Re: Temporary or Permanent Exhaust Repair?
« Reply #18 on: January 29, 2012, 10:55:33 PM »
These guys have a bunch of the emissions parts you need if you need to pass tests. AMC used similar systems across the lineup.
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Offline jspeez13

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Re: Temporary or Permanent Exhaust Repair?
« Reply #19 on: June 14, 2012, 06:29:49 PM »
so is it safe to say that if you have the pulse ait system with the tubes running to the cat you can eliminate it if you get the right cat?  if so, what do you do with the remaining air pump parts?  should you keep the air pump connected to the exhaust manifold injection side? 

Offline carnuck

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Re: Temporary or Permanent Exhaust Repair?
« Reply #20 on: June 15, 2012, 02:35:03 AM »
I stand corrected  ;D I always thought they just forced air in there to dilute the emissions...but it makes sense....Now I dont feel so bad leaving the pump on my car  ;D
Before cats, that's exactly what the AIR system did. We did testing way back in the late '70s that proved the AIR system was hokum without a cat to feed. It thinned out the emissions so cars passed the sniff test, but they wasted more fuel doing so. You can eliminate the AIR rubbish if you get the correct anerobic aftermarket cat (Random Technologies used to sell them with a diagram that allowed even snotty CARB inspectors pass them)
I think I would second that, because my 73 Javalin/AMX had the pump and had all those little tubes to each exhaust manifold runner, and no Cat.

Modern non-areobic (means it doesn't need and shouldn't have air pumped in) high flow cat, like the CA certified http://randomtechnology.com ones run cleaner, leaner with less back pressure and no loss of power due to AIR pump seizing up. (25 HP and higher loss as they start to seize from age. On my E150 van the motor stalled at 60 mph and I had to cut the belt to be able to drive it. Felt like a race car afterwards by comparision!)
FOR SALE
'87 Comanche 4.0L AW4/NP242 3.73 gears, lifted 5" on near new 33" tires $3500 obo
'82 Eagle Wagon (Brown Betty) 4.2L/727/NP229 and soon 8.25 rear axle and non-vacuum 3.08 front to match. 235/75/15 tires. It's down to minor body work (someone creamed my driver's door but I have another in good shape) almost rust free and interior work (seats are worn and carpet torn). $2000 but about to go up due to more work being done.

Pics of my other for sale stuff http://tinyurl.com/jimsclads

 

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