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104730 Posts in 12247 Topics by 4719 Members
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871  Camaro Research Group Discussion / Decoding/Numbers / Re: VIN number matching trim tag on: December 08, 2005, 12:35:20 PM
Seems like I recal a previous post on the old forum which discussed this in some detail.  I I recall, the post stated that if a logistical or actual production problem occurred with the body after Fisher began building it, depending on how sever the issue was, the body would remain on the Fisher side of the fence until the problem was fixed - resulting in a more than standard variance between body build and final assembly build dates.
872  Camaro Research Group Discussion / Originality / 1969 Camaro Chevelle Chambered Ex GM Factory Bulletin on: November 30, 2005, 04:12:57 PM
Currently on eBay, item #Item number: 4594028327; is

"1969 Camaro Chevelle Chambered Ex GM Factory Bulletin

One 1969 Chevrolet Dealer Service Technical Bulletin covering the Chambered Exhaust System on 1969 Chevelle and Camaro SS. Covers the discontiuation of the chambered exhaust system on the Camaro and Chevelle, the interum design, and later replacement systems used. This bulletin could be very valuable in explaining differences on the way cars were equipped from the factory. 5 pages include part numbers, descriptions, and illustraions. Tech bulletin printed April 15, 1969."

Pictures are included.  If the CRG database doesn't have all of the chambered exhaust info. it might need, this might be worth acquiring.

rich69rs Smiley
873  Camaro Research Group Discussion / Maintenance / Re: '68 396 timing suggestions? on: October 30, 2005, 12:46:04 PM
John:

Thank you very much for the info and the very insightful and helpful article.  I'm going to begin the process of coverting both my '66 Chevelle and the '69RS over to full manifold vaccuum.

Richard

rich69rs
1969 RS Coupe
LF7
874  Camaro Research Group Discussion / Maintenance / Re: '68 396 timing suggestions? on: October 28, 2005, 07:08:29 PM
I've been restling with the pros and cons of changing from the original carbureted ported vs direct manifold source for the vacuum advance for awhile now.  Haven't made any changes yet - still trying to appreciate all of the potential engineering implications. 

JohnZ, am I thinking clearly with the following???

Let's say that I go ahead and convert over to manifold vacuum as the source for the vacuum canister.  And then we go out on the highway and are cruising at 75 mph @ 3000 rpm.  For the specs you referenced in your previous post, centrifugal advance is all in.  We have initial (static) timing of 10-12 degrees, centrifugal advance of 20-24 degrees which would give us 30 - 36 degrees advance so far.  Iif I'm cruising, throttle partially openend, relatively high manifold vacuum, there is the potential for another 12-15 degrees of vacuum advance (depending on how much vacuum is required to fully stroke the vacuum canister) or 46-49 degrees of total advance. 

Not knowing any better, to me this seems a little too much total advance.  Do you have a suggestion for desirable total advance for the situation when you would be cruising at highway speed and you would have a combination of initial, centrifugal and at least some (if not all) the vacuum advance?

Clearly manifold vacuum to the distributor helps with idle and lower rpm ranges.  I don't want to create an uh-oh (detonation) at highway speeds.

Thanks

Richard
69RS Base Coupe
LF7
875  Camaro Research Group Discussion / General Discussion / Re: New CRG Research Report Released on Emissions/Smog equipment on: October 26, 2005, 06:36:16 PM
Nice article, however since I have a base 327 with Powerglide, from my perspective, it would have been nice to see more on the '69 CCS / Thermac system. 

From what I've seen (and from what is shown in the 69 Assembly Manual, CCS/Thermac only applied to auto trans cars.

For example, if you look in the front section of the AIM, you won't see the Thermac system even shown.  One has to go to one of the auto trans sections in the RPO section of the AIM (M35 for example) to see the drawings that show the Thermac and associated hardware. 

One additional item relating to Thermac was the differences in the RH exhaust manifold.  For the manual transmission, the "typical" log style manifold was utilized.  However, for the auto trans applications, the RH exhaust manifold had the "heat stove" as an integral part of the assembly.  From there, a seperate stove pipe connected the exhaust manifold to the air cleaner.  It is not clear in the AIM where the vacuum connection from the Thermac was routed.  I assume to a port on the carb, but another possibility would have been directly to the manifold vacuum port at the back of the intake manifold.

Anyone know for sure?

Richard
1969 RS Coupe
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