Temporary or Permanent Exhaust Repair?

[ammachine390]

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

[carnuck]

That was the claim back in the day.   

[68AMXGOPAC]

I stand corrected  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 

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.

[BenM]

These guys have a bunch of the emissions parts you need if you need to pass tests. AMC used similar systems across the lineup.

[jspeez13]

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? 

[carnuck]

I stand corrected   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  

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!)