Chambered Exhaust vs. Standard Exhaust

[Mike McKown]

Walker

Now that I think about this, I believe Walker was Chevrolet's source for the side pipes. But I think they independently developed and marketed them before Corvette usage.

[John H.]

Re: Popping through exhaust with chambered pipes?

"Popping" on overrun can also be caused by an exhaust leak (allowing air into the system), or by a failed diverter valve diaphragm on an A.I.R. system (allows pump output into manifolds on overrun, which a functioning valve diverts out through the valve's "muffler" on overrun instead). Can also be caused/aggravated by lean idle mixture (throttle plates are closed on overrun, so the idle circuit is feeding mixture under very high vacuum) or by retarded idle timing (inadequate vacuum advance).

[Mike McKown]

Very well stated John *NM*

[Roger Legge]

Re: Chambered Exhaust vs. Standard Exhaust

In addition to being offered on a Camaro, I believe it was also offered on the '69 Chevelle.

Roger

[Roger Legge]

Re: Popping through exhaust with chambered pipes?

I have read that a defective valve in the AIR system can possibly cause a popping sound in the exhaust, but I can't claim this to be 100% true.

Roger

[John H.]

Re: Popping through exhaust with chambered pipes?

Roger -

Correct - see my post below - the diverter valve is designed so that when the rubber diaphragm fails, the valve defaults to the open position, dumping pump output to the manifolds full-time.