914-6 air conditioning, Advice on compressor choise Options

[turboman]

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

[ClayPerrine]

an RV / AC box on the roof!?

Wouldn't that be a sight... (IMG:style_emoticons/default/beerchug.gif)

Typical Arkansas redneck way of fixin stuff...

Use lots of duct tape.

And keep an eye on your steering wheel.

[pcar916]

And keep an eye on your steering wheel.

Hey! Don't start with me dude! (IMG:style_emoticons/default/beerchug.gif) I know exactly where my steering wheel is and as long as you and JT aren't around I generally do, with a very few senior moments notwithstanding. And I didn't date any cousins... mostly... that I know of.

The axle-powered compressor would work fine most of the time but I would never do it to a city-bound car. There are no critical failure modes I can think of with one exception. Changing belts would be an itch.

Does anyone have any numbers about how much power it takes to run some typical compressors at speed and 85F or some other milestone? To be fair I haven't looked into it yet. Just being lazy.

I know, it depends but a broad stroke is ok here. I'm thinking a system in good condition would probably such up 15-20 hp or thereabouts but that's a wag without doing any calculations. Anyone? All of my best AC contacts are commercial HVAC guys who's compressors are always run at a constant speed and with different refrigerants. My steam tables are old!!!!

I'm not factoring in any clutch-type LSD issues here. Gotta keep it general-case at first.