chambered exhaust relative performance? - Chevelle Tech
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post #1 of 8 (permalink) Old Jul 5th, 19, 11:20 PM Thread Starter
Dan
 
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chambered exhaust relative performance?

Hi all - my apologies if this has been asked and answered, I did search for it.

I have a 69 L78, it was born in the short chambered exhaust period. The exhaust system on it is destroyed, but has stock exhaust manifolds.

So as I am planning a new system I would like to install the chambered but wonder what the relative power loss(?) I might suffer. I assume today's systems outperform 1969 chambereds.

A side question is - is there any vendor out there who makes headers that accept chambered systems?

Thanks in advance!

Dan
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post #2 of 8 (permalink) Old Jul 6th, 19, 1:55 AM
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Jon N.
 
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Re: chambered exhaust relative performance?

A 2 1/2 inch mandrel bent system with Magnaflows and a X pipe will give you 50 to 100 more horsepower than the original chambered system, and be quieter at the same time. Win, win.

Jon N.

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post #3 of 8 (permalink) Old Jul 6th, 19, 10:00 AM
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Bill
 
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Re: chambered exhaust relative performance?

Quote:
Originally Posted by dyno jonn View Post
A 2 1/2 inch mandrel bent system with Magnaflows and a X pipe will give you 50 to 100 more horsepower than the original chambered system, and be quieter at the same time. Win, win.
Really?

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post #4 of 8 (permalink) Old Jul 6th, 19, 12:37 PM
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Jon N.
 
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Re: chambered exhaust relative performance?

Quote:
Originally Posted by 69SS454 View Post
Really?
Here's a test. They are using Dynomax instead of Magnaflows.

pontiacstreetperformance.com/exhaust tests

They don't test chambered, but I have 69 L88 Corvette F.A.S.T. racing friends that have gone from chambered sidepipes to dynomax/magnaflow underneath systems with unbelievably impressive results.

Jon N.

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post #5 of 8 (permalink) Old Jul 6th, 19, 1:20 PM
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jerry
 
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Re: chambered exhaust relative performance?

While the chambered design is very restrictive, it's performance is directly relative to the power level. If you have a bone stock L78 using cast manifolds, the cork is already there. If you're running a modified L78 geared towards mid-range torque and bigger tube headers, a chambered exhaust will be a much bigger cork. You have to look at this in an honest context.
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post #6 of 8 (permalink) Old Jul 7th, 19, 11:26 PM Thread Starter
Dan
 
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Thanks to all! So might one conclude that the chambered system offered for a short window has been easily surpassed by 50 years of technology.
As I am new owner and reside in a regulation-overrun state, I am currently unaware what the powers that be will allow me to run and pass our ... difficult inspectiin standards.
Thus, I asked about chambered as I suspect the car came with that. I believe factory stock setups are always permitted.
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post #7 of 8 (permalink) Old Jul 15th, 19, 8:40 PM
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Lawrence
 
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Re: chambered exhaust relative performance?

So your State makes you do an inspection on a 50 year old car?
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post #8 of 8 (permalink) Old Jul 15th, 19, 11:31 PM
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Lance
 
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Re: chambered exhaust relative performance?

FWIW..remember that chambered exhaust was a standard pipe size that had "crimps" in it every so many inches, noisy BUT had LESS flow than the same size pipe without the "crimps". Louder but potentially slower due to the exhaust restriction induced by crimping (restricting) the pipe I.D. down.
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