914-6 air conditioning, Advice on compressor choise |
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914-6 air conditioning, Advice on compressor choise |
turboman |
Jul 3 2012, 07:56 AM
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#1
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Newbie Group: Members Posts: 6 Joined: 22-June 12 From: Montoison France Member No.: 14,589 Region Association: France |
Hi, I am in the process to install an original 914 VPC system in my 914-6.
Like all my projects, I work on a budget. First I bought all the parts about 5 years ago, then I refurbished all parts, (professional cleaning, expansion valve) installed the condenser in the front trunk as designed, temporary installed the evaporator console under the dash, and start the preparation process for the compressor installation. I want the installation to be as close as possible to a factory one. For me, is not an option a compressor under the engine, a serpentine belt or similar. I prefer to work extra time, and reach a perfect end product. I used a double pulley from a 74 911, in order to install the pulley and have space for the dual belts, I have to shave a bit the original engine support and the engine cover (see photo). I fit a 2.2 or 2.4 bracket. So far no problems, the end result looks very nice Now I need to choose the compressor. The York is out of question, due to size and efficiency. My options are a Sanden, a Denso or a Panasonic. Any one fitted with a one groove pulley Not being familiar with the air conditioner compressors, and the way you need to calculate cooling capacity vs cabin volume, I would like to ask help form all of you. 1. Which compressor will suit my needs the best? 2. Which compressor is the smallest one? 3. The best compromise? I will keep all of you posted of the progress on the installation and the need or not of a firewall modification. Thanks Francisco Attached thumbnail(s) Attached image(s) |
Larry.Hubby |
Jul 3 2012, 09:47 PM
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#2
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Member who doesn't post much, but has a long time in 914s Group: Members Posts: 186 Joined: 24-November 04 From: Palo Alto, CA Member No.: 3,172 Region Association: Northern California |
I used a Sanden 505 compressor because it was the smallest unit I could find at the time I was looking, although I didn't look at the Nipondensos. Here's the way I solved the firewall interference problem:
As you can see, I used a jackshaft to offset the belt drive toward the rear enough to clear the compressor, which had to be mounted as high as in the stock location. The Sanden 505 is short enough that there is room to do this. The clearance in the car is tight, but the compressor clears the firewall without requiring the latter to be cut: I've seen several other 914-6 AC installations that use some sort of jackshaft arrangement similar to this one. I too considered an electric compressor, which would be attractive because it could be mounted almost anywhere. The one in the Prius (at least the one in the early Prius) ran on 12V even, but it draws 100A! That's a lot more than the maximum output of my alternator, so you'd be discharging the battery steadily when running the AC. |
rgalla9146 |
Jul 4 2012, 12:16 PM
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#3
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Advanced Member Group: Members Posts: 4,564 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None |
I used a Sanden 505 compressor because it was the smallest unit I could find at the time I was looking, although I didn't look at the Nipondensos. Here's the way I solved the firewall interference problem: As you can see, I used a jackshaft to offset the belt drive toward the rear enough to clear the compressor, which had to be mounted as high as in the stock location. The Sanden 505 is short enough that there is room to do this. The clearance in the car is tight, but the compressor clears the firewall without requiring the latter to be cut: I've seen several other 914-6 AC installations that use some sort of jackshaft arrangement similar to this one. I too considered an electric compressor, which would be attractive because it could be mounted almost anywhere. The one in the Prius (at least the one in the early Prius) ran on 12V even, but it draws 100A! That's a lot more than the maximum output of my alternator, so you'd be discharging the battery steadily when running the AC. Is the other accessory drive PS or an air pump ? How effective is your AC installation ? Are you using other components as found in 4 cyl. installations ? |
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