Can't Get Enough
Join Date: Jun 2003
Location: Fredericksburg, VA
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Re: Air Tube & Cat. Conv.
On my '82 Scrambler ( had [img]images/graemlins/censor.gif[/img] CA emissions), the air tube on my cat was hooked up to the air pump in the engine compartment.
I was told the fresh air pumped into the cat. permitted the cat. to convert the more harmful emissions into the less harmful emissions (CO2, etc.). I understood the fresh air permitted/aided the catlysts to do their job (more efficiently).
Whether I was told 'right' or not, I do not know for a fact - no chemical engineer here!
When my smog/air pump 'disappeared' (w/ the associated hoses and tubes), the cat's air tube stem was pinched closed and then bent over to prevent exhaust gases from coming out under the driver's seat. In addition to saving a couple of ponies from turning the air/smog pump, this also effectively stopped the backfiring when letting off the accelerator.