| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
10-24-2016, 12:43 PM
|
||||
|
||||
OHC with AC
I picked up a complete engine the other day, complete with PS and AC, all brackets and hosed still attached.
It's a 1 Barrel engine but has a second solenoid that only gets hit at WOT. Was that used to turn off the compressor at WOT? It was an Automatic car but I see nothing that it would do to the transmission and my car's a 1 barrel with stick. I plan to install all this but use a Vintage air system compressor and box since my car didn't have AC or PS. I'll be using a Sprint Head, cam, intake and exhaust I have as well and switch it to an M20 tranny.
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#2
10-24-2016, 05:53 PM
|
||||
|
||||
IDLE SPEED UP CONTROL
This was used to increase the idle when the air conditioning was turned on.
Having an OHC with Factory AC was a bad plan/design right out of the gate. Thus the need for this switch/solenoid. When I do use my air it's like driving with one foot on the brake  The 1966 system is 126 lbs of power robbing pumps & hoses 
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car. 
Last edited by Jeff Hamlin; 02-25-2024 at 11:00 AM. |
|
#3
10-24-2016, 09:05 PM
|
||||
|
||||
|
The switch I'm referring to looks to only activate at WOT. I'll try and snap a pic of it, right now it's still in the utility trailer. The switch is located down below the carb on some extra bracketry below where the throttle cable hooks up.
Being a one barrel engine it looks like it kicks something off. I seem to remember reading a discussion a few years back on the FGF forum that it kicked off the compressor?
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#4
10-24-2016, 09:21 PM
|
||||
|
||||
|
Some cars of the day (like my 65 Corvair with 110 HP and PowerGlide) had a switch that was activated at WOT. When activated, voltage to the A/C clutch was interrupted, causing the power it took to turn the compressor (especially at higher engine RPM) to be saved for the wheels.
__________________
My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic. |
|
#5
10-25-2016, 05:41 AM
|
||||
|
||||
|
Likely the FIREBIRD switch, Not sure if that has the same function.
I'm sure our FB folks will chime in... 
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car.
|
|
#6
10-25-2016, 05:54 AM
|
||||
|
||||
|
Looking in the FB parts book it is referred to as an Idle Stop,
And was mounted in different configurations and used on both OHC & V8.  
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car.
|
|
#7
10-25-2016, 07:59 AM
|
||||
|
||||
|
Item 45 on the 6 cyl, 1 barrel, AT schematic.
I think it' what Bill says, kicks out the AC clutch at WOT.
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#8
10-25-2016, 06:31 PM
|
||||
|
||||
|
#45 Shown/Listed as Downshift Control;
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car.
|
|
#9
10-25-2016, 08:25 PM
|
||||
|
||||
|
Dunno then, on the 68 schematic 45 points to the switch.
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#10
10-25-2016, 09:04 PM
|
|||
|
|||
|
Are you talking about the box in front of the exhaust manifold as pictured?
|
|
#11
10-26-2016, 08:32 AM
|
|||
|
|||
|
Might be the downshift switch for Firebird ST 300 2 speed. I know that the 66 A body had a switch mounted on the gas pedal bracket.
|
|
#12
10-26-2016, 08:38 AM
|
|||
|
|||
|
BTW the worst application for AC with the huge A6 compressor might have been the Vega 4 cylinder. GM had to use a low compression version of the compressor with an oversized clutch pulley and a vacuum activated clutch cut-out switch. So when engine vacuum dropped low like on hard "acceleration" no AC.
|
|
#13
10-26-2016, 11:02 AM
|
||||
|
||||
|
Quote:
 If it's for the tranny I won't need it. I'll be switching from the 3 speed manual to an M20 with a 3.08 rear posi. I plan to use a Vintage Air system, should be a lot better and lighter than the OEM.
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#14
10-30-2016, 07:08 AM
|
|||
|
|||
|
ho428...you might want to rethink the M20...2.52 first gear and 3.08's w the OHC6 will not be very good off the line...a 4 speed saginaw w 3.50 first gear would be much better and plenty strong for the OHC6
|
|
#15
10-30-2016, 01:10 PM
|
||||
|
||||
|
On my 66 Lemans with A/C it would cut out at speeds above 70MPH, other than that the system worked OK
__________________
Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
|
#16
10-31-2016, 09:07 AM
|
||||
|
||||
|
Quote:
This car is basically a cruise in, travel to a car show car. Here's the pile of parts I was able to acquire for $150 and an old Demon carb I had no use for. I'd never seen that fan before, I assume it's an OHC AC fan?
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ Last edited by ho428; 10-31-2016 at 09:51 AM. |
|
#17
10-31-2016, 10:43 AM
|
|||
|
|||
|
the 3.55's will be better but the OHC is low on torque and that's why GM didn't use the Muncie with it's 2.52 first gear and used the Saginaw with a lower first gear...good luck with which ever tranny you choose
|
|
#18
10-31-2016, 11:20 AM
|
||||
|
||||
|
I do not believe that is the original OHC-6 A/C Flex Fan, if I remember correctly. it should have a small cut out on the end of each blade, but I can't find the pictures I had from my old 66 sprint that had A/C
__________________
Jeff R 60 Jaguar Mark 2, 3.8L Automatic 67 Sprint Firebird 230 OHC-6 4-Speed A/C 78 Catlina Safari, Pontiac 400 powered 77 Astre Formula, 215 Buick V-8 T-5 73 Lemans Safari, 400 4bbl 4-speed 71 Catalina Enforcer, 455 4bbl 06 Mallet Solstice #024 LS2, Now with a Tremec 6060 6-speed! 2012 F-150 Echo Boost (My local Ford Dealer SUX!!!) 2020 Dodge Charger Scat pack (recovered) |
|
#19
10-31-2016, 12:06 PM
|
||||
|
||||
|
Quote:
__________________
https://www.facebook.com/Outlaw-Vint...7899333725868/ |
|
#20
10-31-2016, 06:34 PM
|
||||
|
||||
|
It does look to be a correct FB AC flex fan.
__________________
When I die, I want to go peacefully like my grandfather did, in his sleep. Not screaming like the passengers in his car.
|
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
