Alan 71

Hi Stan,
My original solenoid is in the Northern Carroll County Land Fill waiting to be found in a few thousand years.
I bought a service replacement quite a few years ago.
Here's a close-up of the picture on the instruction sheet that came in the box for that solenoid, and a couple more of the solenoid itself.
Are you looking for a detail in particular?
I continue to be curious about the configuration of the delay relay used during 71 production... there seems to be at least 2. Working reversing and delay relays are interesting to find.
I'll send you an update on the dealer.
Regards,
Alan





Terry M. pointed out that the end of the vacuum pipe is sized to slip into the nylon nipple on the solenoid.... and it does.

Rowdy Rat

Thanks for the photos Alan.

Yes... In particular, I am interested in the label at the moment. My original looks to be a lot like the one in Jerry's photos. The NOS one is exactly like yours. The reproduction is similar to the service part, but still a bit different. I plan to make an accurate repro label, but I need to be absolutely sure that what I am using is correct. My current sample size is one... I'd like a few more before committing the resources to this project.

I can tell you that the original Holley stuff is getting tough to find. I have an original, an NOS, and a reproduction. They are all different to varying degrees.

Thanks again Alan!

Regards,

Stan

Alan 71

Hi Stan,
The labels are a bit of a mystery to me. There are so many versions.
I may have related to you that when I bought the solenoid I presently have there was a label on the solenoid, an extra label was in the box, and the picture on the instruction sheet showed a solenoid with a label... all 3 were different.
If I can contribute to the label effort in any way... info (label size, font style, and size), labor, or financial, I'd like to. I'm not really happy with what's on my solenoid now, (please don't ask why), and would love to have a better reproduction.
I'm also including this label from a car at Wildwood... I think it's a nice example of the horizontal version.
Again, if I can help this effort I'd like to.
Regards,
Alan

71SoCal

I love this forum! Just do a search, and someone else has already thought about it!
A few weeks ago, I started thinking again about the CEC/Idle Solenoid on my 1971 350/270 a/c 4-spd car.
When I run the a/c on my car, the rpm’s drop by about 300, and the car can barely idle. I started thinking that I could correct that by adding the solenoid into my car and it would bump the rpm when the a/c turns on (I don’t have a solenoid installed right now).
I did a bunch of research and learned that the CEC system won’t solve this problem. I love the idea of making my car correct and restoring the CEC system to original condition, but how do I make my car operate correctly when the a/c is turned on?
Is a 300 rpm drop with the a/c turned on a normal thing, or should I be looking somewhere else for the problem?

Alan 71

Hi 71,
I don't think you're the first person to have this situation.
Here's a discussion about what you describe. It's taken from the NCRS archives and is written by someone with far greater understanding about a/c than I.
???
Regards,
Alan

The Chasis Service Manual's theory of operation text regarding the CEC system 'hints' at a different curb idle setting for A/C equipped cars, but the tune-up sticker on the Corvette and service text does NOT document one. The CSM says:

"To prevent dieseling on air conditioned vehicles with automatic transmission, which is caused by the LARGER throttle angle required when setting idle with the air conditioning on...."

Then, they go on to describe the special relay set that engages the A6 compressor, regardless of cockpit control setting on engine shut down. This is reinforced in the 1971 CEC Dealer Training Program Booklet. There, they single out Chevelle, Nova and Corvette vehicles equipped with AC (regardless of manual vs. automatic transmission) to describe the companion smart relay set.

"I 'think' you have to bump curb idle above factory indicated specs on a 1971 AC equipped Corvette to prevent stalling during idle. And, the degree you have to 'boost' curb idle is tricky. It depends on the drag coefficient of your compressor (do you have the real McCoy small displacement A6 or do you have a generic passenger car compressor installed?). Also, if you bump curb idle TOO much, you'll 'tickle' the low end of the factory stock distributor's vac advance engagement.... This can be a devil to diagnose!" Jack Humprey.