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Username Post: 1972 A/C equipped Z-28s        (Topic#346113)
wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-20-17 08:54 AM - Post#2700704    

I usually ask this about once a year or so, but it's been way longer this time around.
Anyone here have one of the very rare factory A/C equipped 1972 Z/28s??
They made 286 '72 Corvettes with A/C equipped LT-1s. not sure they made that many Z/28s... Have seen no documented number.....Anyone??

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 




models916 
Valued Contributor
Posts: 4785

Age: 68
Loc: Addison, IL
Reg: 05-28-10
07-25-17 06:21 AM - Post#2701337    
    In response to wagonmaster

Friend of mine bought one new. Was auto and air. GM allowed this because the z motor was hydraulic lifter.



 
wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
07-26-17 03:28 PM - Post#2701560    
    In response to models916

"GM allowed this because the z motor was hydraulic lifter."

Actually the 1972 models were the last of the solid lifter 350 LT-1s. The 1973 units were hydraulic, the hi-po unit being the L-82.. If he had hydraulics it wasn't a 1972. You could get a turbo 400 auto with the Z-28 for the first time in '72....


Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
Ray1999Z71 
Forum Newbie
Posts: 54
Ray1999Z71
Loc: Taylorsville KY
Reg: 04-11-17
10-18-17 09:13 AM - Post#2711249    
    In response to wagonmaster

Not a Z-28, but my base 72' has air....why do you ask about this? You looking to buy a Z with air? I'd just add a Vintage AC unit to a Z and call it done.

Dad always said "It'll be aight!"


Edited by Ray1999Z71 on 10-18-17 09:13 AM. Reason for edit: No reason given.

 
wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
10-18-17 06:37 PM - Post#2711298    
    In response to Ray1999Z71

No, I ask this question every year or so. The 1972 Z-28 had, near the end of the model year, an approved option for A/C. Solid lifter high performance engines had not had this since 1965. I am talking about a factory A/C equipped Z-28. They are very rare. Same with Corvettes with the LT1 engine in 1972, but I have seen several of these and sold one, new in 1972.
Thanks for your response.

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
427SS65 
"15th Year" Platinum Supporting Member & Moderator
Posts: 14663
427SS65
Age: 73
Loc: St. Louis, MO
Reg: 12-11-03
10-18-17 10:30 PM - Post#2711327    
    In response to wagonmaster

Hey Joe, did those compressors use a larger diameter pulley to slow down the action or were they a different design?

Tom 65-70 Full Size Team Moderator

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wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
10-23-17 12:59 PM - Post#2711839    
    In response to 427SS65

It's been a while since I've seen one, but my recollection is that they were the very same as the regular 350/4 bbl. The 1972s were very low compression and even with solid lifters they weren't exactly killers from the factory....

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
elcamino 
Dedicated Member
Posts: 5403
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
10-29-17 05:58 PM - Post#2712615    
    In response to wagonmaster

Reason for no A/C on solid lifter engines: Solid lifter engines turn high RPM’s. The A/C compressor and condenser cannot handle the high rpm’s.

Mike
2017 GMC Sierra Denali Ultimate 6.2L(420hp)/8-sp Z95
2018 Polaris RZR S 900 EPS


 
427SS65 
"15th Year" Platinum Supporting Member & Moderator
Posts: 14663
427SS65
Age: 73
Loc: St. Louis, MO
Reg: 12-11-03
10-29-17 11:38 PM - Post#2712657    
    In response to elcamino



Tom 65-70 Full Size Team Moderator

View My Photos Here

65 Impala SS Tahitian Turquoise


 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-07-18 08:09 PM - Post#2742292    
    In response to wagonmaster

  • wagonmaster Said:
You could get a turbo 400 auto with the Z-28 for the first time in '72....



The TH400 was available in the Z-28 from '70 to '74.

NYH1.


'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
08-11-18 02:29 PM - Post#2742746    
    In response to NYH1

I have been told that by 72, all of that was gone and you could get AC on any engine.



 
wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
08-18-18 07:16 AM - Post#2743480    
    In response to Mercedes

The turbo 400 statement is correct. but the a/c equipped LT-1 engines were very late 1972 production options in the Corvette and Z-28. Not available all year.

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-19-18 04:16 PM - Post#2743631    
    In response to wagonmaster

How times have changed. Now every car comes pretty much standard with A/C. Camaro's, Challenger's, Mustang's, Corvette's ect. no matter how they're setup. Having A/C is nice though for sure.

NYH1.

'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
08-20-18 01:52 AM - Post#2743685    
    In response to NYH1

I did a study in college and showed production of cars equipped with AC.

You could see the sharp rise in AC equipped cars starting with the 1973 model year. From there, it increased almost exponentially.

This phenomenon pretty much goes along with the old saying that once you have it you can't live without it.

Today's engines have revving capability beyond that of years ago. The computer turns off the AC if needed based upon speed.



 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-20-18 12:08 PM - Post#2743765    
    In response to Mercedes

Some good points there for sure.

The new Dodge Demon (Challenger) incorporates the A/C system into the intercooler system for the supercharger. I don't know all the details on how the system works.

NYH1.

'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
08-20-18 02:16 PM - Post#2743780    
    In response to NYH1

I'll have to look into the Dodge Demon AC system. I wonder if they are piggy backing the AC condenser with the intercooler so that both are able to lose heat more efficiently?

I'm certified in auto AC so I've studied the systems over the years.

The early systems ran the compressor full time and returned any excess refrigerant to the suction line if not needed in the evaporator. The problem with that is that you have the compressor running at full capacity every time the system is on regardless of cooling demand.

The next generation of system cycled the compressor based upon the suction line pressure. You basically built up enough refrigerant in the pressure line and when the suction pressure would reach around 20 lbs/in, you kill the compressor electrically for a while until the pressure builds up to around 45 lbs/in. Then, you re-engage the compressor and so on. That method of controlling the refrigeration circuit went largely unchanged for about 25 years.

Now we have variable capacity compressors which are electronically controlled by a solenoid valve. The system is always running although very little refrigerant is moving when it is off. This greatly reduces the amount of drag on the engine as the interior of the car reaches temperature and makes the AC system very efficient to virtually no impact on power and fuel economy. These systems are also electronically controlled for temperature and do a great job.

Things have really changed!



 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-20-18 07:24 PM - Post#2743824    
    In response to Mercedes

Well at least you have a clear understanding on how A/C systems work. Me on the other hand....I know how to turn them on and off!

It was a while ago that I heard about the Demon's system. IIRC, the cool/cold refrigerant may be cycled either through the supercharger or the intake. Then ran back through the A/C system to cool it back down normally.

I think you have to choose which system you want on. Either your regular A/C system or the intercooling system.

It'll be interesting to see what you find out.

NYH1.

'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-20-18 07:25 PM - Post#2743825    
    In response to NYH1

wagonmaster, did you ever find a car?

NYH1.

'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
1983G20Van 
Super Senior Member
Posts: 3767

Loc: Bedford, Texas, USA
Reg: 11-13-02
08-21-18 11:12 AM - Post#2743893    
    In response to NYH1

  • NYH1 Said:
Well at least you have a clear understanding on how A/C systems work. Me on the other hand....I know how to turn them on and off!

It was a while ago that I heard about the Demon's system. IIRC, the cool/cold refrigerant may be cycled either through the supercharger or the intake. Then ran back through the A/C system to cool it back down normally.

I think you have to choose which system you want on. Either your regular A/C system or the intercooling system.

It'll be interesting to see what you find out.

NYH1.



The intercoolers are actually cooled by a mixture of antifreeze and water. The intercooler water loop is chilled by a/c refrigerant in a water cooler. The Mustang Cobra guys have been messing with them for years.

https://killerchiller.com/


1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals


 
Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
08-21-18 12:23 PM - Post#2743899    
    In response to 1983G20Van

That sounds like a very interesting system. I'll have to check the web sites to see the particulars of that.

I know that the late 80s and early 90s Mercedes vehicles used the suction (cold) line on the air conditioning system to cool the fuel prior to it entering the master distribution box. Unfortunately, if it leaked fuel, you had to either bypass the hose or replace it.



 
NYH1 
Contributor
Posts: 730

Loc: Central New York
Reg: 07-15-09
08-21-18 03:18 PM - Post#2743913    
    In response to 1983G20Van

  • 1983G20Van Said:
The intercoolers are actually cooled by a mixture of antifreeze and water. The intercooler water loop is chilled by a/c refrigerant in a water cooler. The Mustang Cobra guys have been messing with them for years.

https://killerchiller.com/



I knew they used the A/C system somehow. Wasn't sure exactly how.

NYH1.

'78 Camaro, mild Vortec head 385 stroker, 9.1 comp. Lunati Voodoo 262/268 hyd. ft. cam, RPM Intake, 650 AVS carb, TH350 Coan 11" 2600 stall, 8.5" 10 bolt. 3:42 posi, 1 5/8" Full length Headers, 2 1/2" Flowmaster Exhaust System.


 
Mercedes 
Contributor
Posts: 189

Reg: 07-09-18
08-22-18 10:36 AM - Post#2743997    
    In response to NYH1

I looked at the link. It appears that they are using the suction line (which is cold) to cool down the coolant, which is a good idea.





 
wagonmaster 
Senior Member
Posts: 8910
wagonmaster
Age: 70
Loc: Loganville, Ga.
Reg: 04-28-00
08-25-18 04:58 AM - Post#2744312    
    In response to NYH1

Haven't yet. I was really just checking to see if any one of our crew owned one.... Didn't make many....

Hey T @!


In Memory of Mike McVeigh- The "Mad Spring Wacker" He roams the Forums of CT forever in our hearts and minds!

http://www.picturetrail.com/wagonmaster55

Joe


 




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