Those of you who have added A/C know that when the compressor kick in the RPM's drop to almost stall conditions. I did a search and using information from various post I consolidated and took a few pictures. This worked for me as it was a bolt on.
NOTE ** I'm running a Holley 650 Street Avenger carb that already had both holes. Your carb may or may not have these hole and you will need to drill/tap or adjust to your situation.
Parts: There are other combinations but these fit perfect
Holley universal mounting bracket 20-9
GP Sorenson Solenoid 779-1904
click on image for larger view
Then you need to run a wire (12V +) that is spliced into wire that engages compressor to solenoid.
Then a little adjustment (solenoid in/out) to get RPM set correctly.
Edelbrock also sells them through Summit Racing for standard carbs but unk if it will fit Holley? They call them Idle Compensators. $89.00 at Summit. Has a little different mounting bracket. Also, these must have a full 12 volts to work so if your alternator is only putting out 8 to 10 volts at idle, it won't work. Trust me, I know. I sent one back to find out the hard way and ended up swapping to a smaller alternator pulley to increase voltage at idle. (on my 32 coupe with 1 wire 100amp alt).
Edelbrock also sells them through Summit Racing for standard carbs but unk if it will fit Holley? They call them Idle Compensator's. $89.00 at Summit. Has a little different mounting bracket. Also, these must have a full 12 volts to work so if your alternator is only putting out 8 to 10 volts at idle, it won't work. Trust me, I know. I sent one back to find out the hard way and ended up swapping to a smaller alternator pulley to increase voltage at idle. (on my 32 coupe with 1 wire 100amp alt).
Ken, To avoid this situation why not tap into a Battery direct circuit? Either the starter or a connector at the Pos. Terminal of the battery. A 15Amp Fuse should do the trick without too much Amperage. Al W.
Those of you who have added A/C know that when the compressor kick in the RPM's drop to almost stall conditions. I did a search and using information from various post I consolidated and took a few pictures. This worked for me as it was a bolt on.
I did the same thing when I built my Grand Sport - worked great! BTW, the white nylon sleeve in the rubber bushing on the carb lever should have the flange on the inboard (carb) side; it's there to prevent the cotter pin from tearing up the rubber bushing.
I did the same thing when I built my Grand Sport - worked great! BTW, the white nylon sleeve in the rubber bushing on the carb lever should have the flange on the inboard (carb) side; it's there to prevent the cotter pin from tearing up the rubber bushing.
Thanks John I knew that but somehow installed A$$ backwards
Ken, To avoid this situation why not tap into a Battery direct circuit? Either the starter or a connector at the Pos. Terminal of the battery. A 15Amp Fuse should do the trick without too much Amperage. Al W.
the solenoid should actuate with the compressor clutch, not be energized all the time....
Bill
Edelbrock also sells them through Summit Racing for standard carbs but unk if it will fit Holley? They call them Idle Compensators. $89.00 at Summit. Has a little different mounting bracket. Also, these must have a full 12 volts to work so if your alternator is only putting out 8 to 10 volts at idle, it won't work. Trust me, I know. I sent one back to find out the hard way and ended up swapping to a smaller alternator pulley to increase voltage at idle. (on my 32 coupe with 1 wire 100amp alt).
1-wire alternators are notorious for not putting out at idle, and therefore are not a good application for a street car....
Bill
Ken, To avoid this situation why not tap into a Battery direct circuit? Either the starter or a connector at the Pos. Terminal of the battery. A 15Amp Fuse should do the trick without too much Amperage. Al W.
Was easier to swap to the smaller pulley and get 12 volts at idle. Had the pulley already (well, have a few anyway).
Has anyone seen this done on a Big Block Tri-Power car? I purchased the solenoid, a generic bracket and ran the wire when I installed my A/C (2 summers ago), but never figured a good way to mount it. If anyone has a picture of a way to mount the solenoid, I would love to see it.
Thanks, Roy
Has anyone seen this done on a Big Block Tri-Power car? I purchased the solenoid, a generic bracket and ran the wire when I installed my A/C (2 summers ago), but never figured a good way to mount it. If anyone has a picture of a way to mount the solenoid, I would love to see it.
Thanks, Roy
I did it with a piece of angle iron from Home Depot. Lots of fitting cutting fitting and more cutting but it works. Mounts to the rear drivers side stud on the center carb. This is one of those jobs that takes time and patience...lots of both are reqired. Total material investment for the bracket is about $5.00
I did it with a piece of angle iron from Home Depot. Lots of fitting cutting fitting and more cutting but it works. Mounts to the rear drivers side stud on the center carb. This is one of those jobs that takes time and patience...lots of both are reqired. Total material investment for the bracket is about $5.00
Any chance you could post a picture of your work?
Thanks, Roy
Location: Going too fast over the hill. Lots of miles. Lots of smiles. I drive a Corvette
I made my bracket from aluminum, and got a $16 solenoid from a local aouto parts store. Just hook the 12volt wire to the A-C compressor and the idle never drops.
Last edited by magicv8; 05-11-2007 at 11:31 PM.
Reason: add pic
Any chance you could post a picture of your work?
Thanks, Roy
I have never posted a picture on any board. Just had to many hassels trying. Also lazy I guess, I know I should learn but too many other things to do, like making solenoid brackets. If someone wants to post the PICS for me I can forward them to whomever volunteers to do the post. I have some high resoultion pictures that can be zoomed into for excellent detail.
I am posting these pictures for fellow forum member hpexpatriot (thanks Ray).
I was having a hard time visualizing how to install a solenoid for my 3x2 setup. Looks like a very clean job.
Roy
Glad to help. I hope some of the other guys find this useful. As you can see it is a little tight down by the accelerator pump and the fuel line into the center carb but it works so that is the real measure of the job.
For those not so close to our conversations Roy, this bracket was made starting with a simple piece of angle iron I bought at the local Home Depot. It takes some patience, a bench grinder and a Dremmel along with one of those air powered cuttoff tools and a few grinding stones for the air tool. The brackket is not something you can "rip off" in an hour or less: be real careful to get the overall shape correct before drilling any holes. Once a hole is in the wrong place it is suddenly and unchangeably time to ....."Start all over again". Ask me how I know that!!!!!!!!
Last edited by hpexpatriot; 05-14-2007 at 12:49 PM.
Would anybody happen to have a pic of a setup with an edelbrock. I'd like to do this to mine but cant figure out how to do the bracket. I 'd use the one from edelbrock but the solenoid at the parts house is only $20 so to pay an extra $69 for the bracket is lot of tooling. Thanks for any help.
Corvette Store
Solenoid for A/C
YEP! 
Also lazy I guess, I know I should learn but too many other things to do, like making solenoid brackets. If someone wants to post the PICS for me I can forward them to whomever volunteers to do the post. I have some high resoultion pictures that can be zoomed into for excellent detail.
Thanks for any help.
