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Author Topic: Chambered exhaust hanger  (Read 5988 times)
fireZ
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« on: November 12, 2010, 08:26:59 AM »

Anyone have a good picture of the exhaust hanger that supports the chambered pipe just before it goes up and over the rear axle. Not sure were this hanger bolts to the car. Thanks
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1968 Z28 LA Built
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BlackoutSteve
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« Reply #1 on: November 12, 2010, 09:06:02 AM »

I would think it's the same mount location as the N10 dual exhaust hangers.



I don't think there are any other locations in that area.

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Restoring my RHD 69 Jane in Melbourne, Australia.
http://www.usmuscle.com.au/Forum/showthread.php?t=2840
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« Reply #2 on: November 12, 2010, 09:20:05 AM »

You can find the information in AIM NC8-A1 thru NC8-A3.
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Stingr69
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« Reply #3 on: November 12, 2010, 01:25:44 PM »

The GM hangar looks like this. It uses basically a large sheet metal screw attached to the bottom of the car and is clamped to the pipe on the other end.:



-Mark.
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IZRSSS
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« Reply #4 on: November 12, 2010, 01:31:06 PM »

Can anyone tell me if the chambered exhaust was an option for the L48 or was it strictly for the big block cars? Also, when was this option available during the '69 run. Its my understanding it was latter in the year...is this correct?
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mark x22
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« Reply #5 on: November 12, 2010, 01:54:43 PM »

It uses the two holes shown in BlackoutStves picture.
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Gramps69Z
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« Reply #6 on: November 12, 2010, 02:30:48 PM »

Can anyone tell me if the chambered exhaust was an option for the L48 or was it strictly for the big block cars? Also, when was this option available during the '69 run. Its my understanding it was latter in the year...is this correct?

Chambered dual exhaust was initially standard on Z28, L34, and L78, but was made optional in November 68 due to noise restrictions (also available on COPO cars), and was finally discontinued in May 69.

CRG 1969 Model ID
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Captain John Wykoff
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« Reply #7 on: November 12, 2010, 02:50:49 PM »

I read an article in MCN Muscle Car News of a L48 owned by John Miller from Indiana (this was a few years back), a hugger orange car that has the chambered exhaust. This is why I asked. Seems this exhaust can add another 25hp.

Thanks for the info John
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fireZ
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« Reply #8 on: November 12, 2010, 03:02:48 PM »

As always help as soon as I asked. Thanks guys
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1968 Z28 LA Built
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tom
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« Reply #9 on: November 12, 2010, 04:37:13 PM »

I thought I read it was actually more restrictive.
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69 X11 Z21 L14 glide
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« Reply #10 on: November 12, 2010, 05:08:58 PM »

I thought I read it was actually more restrictive.
Not sure but here's the quote from the article;

"It's one that Chevy fans have forgotten about because it doesn't have one of the 396 mill", (referring to the L48) the Hoosier State owner explained. The point must be made that this particular 350 engine makes more than the factory figure, and it's done with a factory available option. "The car carries an optional chambered exhaust system which provides for a more free-flowing exhaust and a slight increase in horsepower, probably pushing it very close to the 325-horse 396 engine."

Sure hope we can get it confirmed one way or the other here...

Thanks Tom
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fireZ
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« Reply #11 on: November 12, 2010, 06:48:58 PM »

Ok now the big problem does anyone sell just that hanger and reinforcment piece? I bought a complete set and misplaced the 2 hangers at the border when customs checked my parts.
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1968 Z28 LA Built
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Stingr69
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« Reply #12 on: November 13, 2010, 07:21:54 AM »

The chambered exhaust was not a power adder - it was/is a power robber.  I run one now but only because the car came with it originally.  Are you 100% sure you want to run it? It is LOUD and slows you down. Not a great system really.

You can buy chambered hangar kits from the usual suspects. About half of the original set was still attached to the back of my car when I got it.  D&R sold me some loose pieces to complete my system. My car did not demand NOS so "functional" pieces were used as opposed to exact reproductions. I have not seen perfect repros of those.

-Mark.
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JohnZ
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« Reply #13 on: November 13, 2010, 11:45:05 AM »

The chambered exhaust was not a power adder - it was/is a power robber.

That's correct - the same convoluted "muffler" section (patented by Walker Manufacturing) of the chambered system had a 1-7/8" diameter core pipe, and was also used on the Corvette factory sidepipes, where it cost upwards of 50hp on big-blocks compared to the stock 2-1/2" under-car exhaust system. The Camaro stock system used 2-1/4" pipes, so the chambered system on the Camaro was also more restrictive than the stock system.
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« Reply #14 on: November 13, 2010, 11:51:20 AM »

The MCN article about the chambered system was written back in '06.  I held on to it all this time thinking that one day I would consider using it.
 
Thanks for the clarification John & Mark
« Last Edit: November 13, 2010, 12:56:01 PM by IZRSSS » Logged
william
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« Reply #15 on: November 13, 2010, 12:53:24 PM »

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
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« Reply #16 on: November 13, 2010, 01:06:24 PM »

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
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JohnZ
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« Reply #17 on: November 14, 2010, 04:14:46 PM »

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.
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paceme
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« Reply #18 on: November 14, 2010, 05:06:34 PM »

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.
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Steve Shauger
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« Reply #19 on: November 14, 2010, 05:54:23 PM »

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

Thanks John and Steve.
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paceme
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« Reply #20 on: November 15, 2010, 09:11:07 AM »

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. 
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Steve Shauger
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JohnZ
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« Reply #21 on: November 15, 2010, 11:27:44 AM »

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.
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'69 Z/28
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« Reply #22 on: November 15, 2010, 04:11:14 PM »

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!
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69 x77 burnished brown, 711 int 05A bought in 78
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« Reply #23 on: November 15, 2010, 06:07:48 PM »

 Grin Cheesy Wink!!! Any idea on the cost for an L48?
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paceme
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« Reply #24 on: November 15, 2010, 10:31:39 PM »

I paid $1180 plus tax in 2004.
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Steve Shauger
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tmodel66
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« Reply #25 on: November 15, 2010, 10:38:25 PM »

I have a couple options to choose from when I finally order. The guy said between $1700 to 2 grand.
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Daniel  
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« Reply #26 on: November 15, 2010, 11:11:30 PM »

Thanks Steve & Dan! Not bad for a factory look-a-like and performance to boot!
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BULLITT65
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« Reply #27 on: July 25, 2012, 04:43:50 PM »

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?
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
lynnbilodeau
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« Reply #28 on: March 17, 2013, 08:56:13 AM »

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.
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lynnbilodeau
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« Reply #29 on: March 20, 2013, 05:44:29 PM »

Gary pulled his originals and they are self tapping machine thread 1/4 inch.
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firstgenaddict
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« Reply #30 on: November 13, 2014, 08:31:59 PM »

Unless they have changed them in the last few years, Gardners rear hangers are not correct (The arched rubber spacer is not in the hanger).  Eric did tell me that it would cost an extra $50 to make the hanger correct... I stated that equated to a few percent of the system cost and since I was paying near 2k $50 wasn't going to push me not to buy... I wished they consulted the hobby before the decision was made to scrimp on the hanger.









Over the axle hanger retainers reproduction and original.



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James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
BULLITT65
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« Reply #31 on: November 14, 2014, 12:37:48 PM »

Seems like my bracket may be different with a rubber strap as well.  Was this a chambered only part?
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
Stingr69
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« Reply #32 on: November 14, 2014, 06:58:00 PM »

$2000 and you still have to PAY MORE to get a tiny piece of rubber added to make the hangar right?!?!?! 
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firstgenaddict
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« Reply #33 on: November 17, 2014, 10:15:20 AM »

There is a difference between the optional system vs the earlier system rear drivers hanger (at least in the assembly manual) 
The rear drivers hanger on the early system was different, the later system has the same part number as the N10.
The overaxle hangers are different for Chambered vs N10 throughout the entire run as the N10 hangers are much longer, the chambered utilizes only one bolt with a retainer and the N10 uses a 2 bolt attachment.
The rear crossover chambered pipes had 2 welded straps on them and are bolted together on the early system, the bolt nut and washer were deleted in mid January. (original exhausts would need to be studied to determine if and when the change fell upon the assembly line.)

quote author=Stingr69 link=topic=7308.msg108269#msg108269 date=1416009480]
$2000 and you still have to PAY MORE to get a tiny piece of rubber added to make the hangar right?!?!?!  
[/quote]

oh no it wasn't even offered as an option...


When I questioned Eric Gardner about the difference he knew it and merely stated it would cost an extra $50 for them to make them correct. I stammered in disbelief as I couldn't even fathom eliminating a part to save $50 ESPECIALLY given the articles I had read regarding Gardner's adherence to correctness.

It was at this point I basically gave up on anything reproduction being correct regardless of the price.


What I disliked the most is that I offered to send him my originals so he could copy them or take it apart to use my white strap, I asked if he needed anything in order to ensure everything was correct as I really wanted the white sidewall strap replaced with like. He stated they originally made them with white and or black and they received complaints about the white strapped hangers so they stopped however he thought there were some white straps still around and he would try to put it in my hanger.
He told me that they knew how the originals were made and theirs were exact copies, he never mentioned the wedged rubber omission.

Whether intentional or not the pictures on their website were not of a high enough resolution to see that the wedge is missing.
« Last Edit: November 17, 2014, 10:36:44 AM by firstgenaddict » Logged

James
Collectin' Camaro's since "Only Rednecks drove them"
 
Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
https://picasaweb.google.com/112392262205377424364/1969_Z28_Restoration
BULLITT65
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« Reply #34 on: November 17, 2014, 11:33:17 AM »

I have also talked with Eric about some of the finer details on his system. I think initially when it came out it was considered a high level reproduction, mostly because a lot of reproduction stuff in general was (is) crap. But over the years Trim* parts and other items have become more and more refined, while his exhaust system seems to have stayed the same. It is still a nice system from what I have seen but, little things like these clamps as well the muffler clamps on the resonator set up and the over the axle hangers could have been reviewed by him and made to be correct. From what I researched a few years ago there wasn't another company that was going to swoop in and eclipse his system, but I think you always want to try to improve your own product right?
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1969 garnet red Z/28 46k mile unrestored X77
Looking for 3192477 (front) spiral shocks 3192851 (rear) please
Looking for an original LOF soft ray windshield
Looking for original Delco side post negative battery cable part # 6297651AV
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