Chambered exhaust hanger

[william]

Chambered is not a performance exhaust system. Many years ago Bill Porterfield dyno'd a ZL-1 engine in varous states of tune but through the stock chambered system. For the last run they pulled it off; picked up 80 hp.

http://www.camaros.org/copo.shtml

[IZRSSS]

Why was the chambered exhaust originally developed? Was it being passed off as a HP booster or has this misnomer developed on its own based on preception rather than facts?

Thanks for the link William

[JohnZ]

Why was the chambered exhaust originally developed? Was it being passed off as a HP booster or has this misnomer developed on its own based on preception rather than facts?

The chambered exhaust system was a Sales & Marketing idea, not an Engineering idea, just like the sidepipes on Corvettes.

[Steve Shauger]

Why was the chambered exhaust originally developed? Was it being passed off as a HP booster or has this misnomer developed on its own based on preception rather than facts?

The chambered exhaust system was a Sales & Marketing idea, not an Engineering idea, just like the sidepipes on Corvettes.

I actually have a Gardner chambered system I had on my Black Z for a month. I replaced it with a Gardner transverse system because I am not particularly fond of the sound. Its been stored away for 5 years...I guess I should sell it. I think chambered sound a bit better on a big block, but certainly not a performer.

[IZRSSS]

Well that pretty much blows that system out of the water.  What are your thoughts on a Gardner Exhaust System?

Thanks John and Steve.

[Steve Shauger]

Why was the chambered exhaust originally developed? Was it being passed off as a HP booster or has this misnomer developed on its own based on preception rather than facts?

The chambered exhaust system was a Sales & Marketing idea, not an Engineering idea, just like the sidepipes on Corvettes.

This baffles me regarding power loss using the chambered system. You would have thought some testing would have been done to validate the efficiency of the system prior making it standard on all their HP model. In actuality Chevrolet choked the life/performance out of these cars with this system. A ZL1 does have a lot  more flow due to its displacement and compression, so it would be effected the most by the system. 

[JohnZ]

This baffles me regarding power loss using the chambered system. You would have thought some testing would have been done to validate the efficiency of the system prior making it standard on all their HP model.

It wasn't about efficiency - it was all about the sound, as it was on Chevelles and Corvettes. Spoilers and stripes didn't make cars go any faster either, but they sold cars and the options made money; don't confuse Marketing with Engineering.

[x77-69z28]

IZRSSS, gradner is the best exhaust system if you are looking for originality. if you go to their website, they tell you flat out if you are looking for more performance, go elsewhere. if you want originality, they are it!

[IZRSSS]

  !!! Any idea on the cost for an L48?

[Steve Shauger]

I paid $1180 plus tax in 2004.

[tmodel66]

I have a couple options to choose from when I finally order. The guy said between $1700 to 2 grand.

[IZRSSS]

Thanks Steve & Dan! Not bad for a factory look-a-like and performance to boot!

[BULLITT65]

John,
 I figured since Mark Donahue used them on his 69 Camaro in the trans am series, that the spoilers were engineering at work to make the car more efficient on the track, right?

[lynnbilodeau]

Back on exhaust systems, particularly hangers.
I have all my original hangers.
The screws removed from the side hangers are 1/4 sheet metal screws.  Is this correct?
AIM shows 1/4 self tapping, but doesn't id whether it is a machine thread or a sheet metal thread.

Thanks again to all you guys who know.

[lynnbilodeau]

Gary pulled his originals and they are self tapping machine thread 1/4 inch.