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> A/C on a 3.2 Conversion, Building an A/C system
McMark
post Jan 5 2015, 09:13 PM
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We're doing an A/C install on a 3.2 project car and I though ya'll might like to see how it goes.

First I made a rough mockup of the location to test fit the setup in the car. This is just a TINY bit too high. I need to move it down and outwards a bit to clear things.
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Once I had the general location I started making paper templates of the mount. It's a bit like putting together a puzzle, but instead of finding where pieces go, you just make your own as you go along. This will be made out of 1/8" plate most likely. The three circles you see will be bolts. The mount will be two pieces -- one underneath the tin and one on top. The tin will be sandwiched in between the two.
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Oh man. How do I STILL not have a CNC plasma cutter. (IMG:style_emoticons/default/headbang.gif)
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JmuRiz
post Jan 5 2015, 09:18 PM
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Very neat, a higher power engine like a 3.2 or 3.6 would have no issues with a/c.
Didn't someone modify 3.2 heat exchangers on their /6 conversion? Good heat and a/c would be a dream on a 914/6!
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McMark
post Jan 5 2015, 09:19 PM
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These are just typical 914-6 headers. This car may also be getting a gas heater system. (IMG:style_emoticons/default/happy11.gif)
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shoguneagle
post Jan 5 2015, 09:56 PM
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The 3.2 heat exchangers can be modified and used. The modification relates to having a straight shift bar from the firewall to the shift point on the transmission and putting a trough for clearance in the left heat exchanger.

I have modified my left exchanger to reflect these changes and they are working including the shifting. Not a big issue other than taking your time to set the clearances and making sure the shift rod works properly.
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Mark Henry
post Jan 5 2015, 09:58 PM
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What would be real cool, or should I say hot, is if you could reverse the AC and turn it into a heatpump. (IMG:style_emoticons/default/smile.gif)
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ConeDodger
post Jan 5 2015, 10:28 PM
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No no no! I do not want to see how it goes!
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GeorgeRud
post Jan 5 2015, 11:05 PM
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Does anyone have a picture of the factory 911 heat exchangers used on a 914? I'm trying to imagine the routing of the exhaust and warm air, but can't quite wrap my head around this.
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JStroud
post Jan 5 2015, 11:08 PM
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QUOTE(ConeDodger @ Jan 5 2015, 08:28 PM) *

No no no! I do not want to see how it goes!


(IMG:style_emoticons/default/agree.gif) I'm with Rob.....if it goes well it could eventually cost me a lot of $$ (IMG:style_emoticons/default/happy11.gif)
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JStroud
post Jan 5 2015, 11:11 PM
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Mark, with that hanging over to the side so far would this have to be installed after the engine was in the car? Seems like maybe the bracket too. Fun project.
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jeeperjohn56
post Jan 5 2015, 11:30 PM
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Mark, when you get this figured out give me a call and let me know what the cost will be. what kind of condenser are you using?would the stock one up front work? let me know when you get it worked out. John
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McMark
post Jan 6 2015, 02:08 PM
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QUOTE(JStroud @ Jan 5 2015, 09:11 PM) *

Mark, with that hanging over to the side so far would this have to be installed after the engine was in the car? Seems like maybe the bracket too. Fun project.

No, this will clear the engine shelf. I'm using the 914-6 tins as my guide. The compressor itself may have to be mounted after the engine is in, but that can be a good thing. If you have to pull the motor, it's nice to leave the AC lines unopened.

QUOTE(jeeperjohn56 @ Jan 5 2015, 09:30 PM) *

Mark, when you get this figured out give me a call and let me know what the cost will be. what kind of condenser are you using?would the stock one up front work? let me know when you get it worked out. John

The condenser is an aftermarket unit. There really isn't anything fancy about a condenser. So we find one that works with whatever space restrictions we have. Also, making it as large as possible increases efficiency.
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GeorgeRud
post Jan 6 2015, 03:11 PM
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I wonder if there is enough clearance to allow a condenser to be fitted under the engine lid (aka 911). If one would modify the lid to a 914-6GT double grill, it could allow a large condenser and allow a shorter hose run than a front trunk mounted one.

Please keep us informed.
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Cairo94507
post Jan 6 2015, 04:52 PM
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Just what I do not want to see.....the one aspect of my build on my car is that it does not have AC and here in the San Ramon Valley, it can get hot in the summer and early fall.

I am amazed with all of the hot roders out there installing custom AC units that fit into ashtrays, or so it appears, that we don't have a very compact and reliable unit to fit the 911 motored 914's - including the stock 3.2. I would love for my Six to have AC but that may bring the 914 Gods down on me.....
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Dave_Darling
post Jan 6 2015, 05:17 PM
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Mark, I recall some concern about the mounting locations for other similar setups on 911 engines in the past. Specifically that the chain housing studs may not have been up to the stress and vibration of the compressor in the long run. Do you think that the extension of the mount that goes all the way to the motor mount will take enough of the load for that to not be an issue?

--DD
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Mueller
post Jan 6 2015, 05:27 PM
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Nice mock-up Mark...if you need some billet parts CNC'd, let me know...I'll gladly do them for credit on that other motor!
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76-914
post Jan 6 2015, 05:40 PM
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If that's a rotary compressor it won't vibrate nearly as much as the older units. Hey Mark, I'm watching this thread in hopes of receiving some enlightenment. I'd really like to learn the order in which the various components are installed, hose sizes, parts compatibilities, charging the system blah, blah. I hope to add AC within 18 months to Kugel which already has a compressor. (IMG:style_emoticons/default/popcorn[1].gif)
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crawler
post Jan 6 2015, 05:59 PM
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If you guys ever get to Phoenix Arizona and need machine work. (Aerospace machine shop) give us a call. 480-926-2127
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Mueller
post Jan 6 2015, 06:18 PM
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QUOTE(crawler @ Jan 6 2015, 03:59 PM) *

If you guys ever get to Phoenix Arizona and need machine work. (Aerospace machine shop) give us a call. 480-926-2127


You don't use FedEX or the US Postal service (IMG:style_emoticons/default/smile.gif)

Nice little Mori lathe you've got!
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McMark
post Jan 6 2015, 09:30 PM
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QUOTE(Dave_Darling @ Jan 6 2015, 03:17 PM) *

Mark, I recall some concern about the mounting locations for other similar setups on 911 engines in the past. Specifically that the chain housing studs may not have been up to the stress and vibration of the compressor in the long run. Do you think that the extension of the mount that goes all the way to the motor mount will take enough of the load for that to not be an issue?

--DD

Yeah, I learned from those setups. This attaches to the motor mount, and that's it. The first three pictures in the thread are just a mockup mount. I needed to confirm the location would work without hitting the body. The real one (paper mockup) doesn't touch the chain housings, cam towers, etc. I won't know if it's rigid enough until I make it, but that's the next phase.
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TravisNeff
post Jan 7 2015, 09:12 AM
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