'80SC with 3.6 transplant AC problem, need advice

uwanna · 08-26-2009, 06:34 AM

17yrs ago, I put a 964 3.6 motor into my '80SC. Everything has been just ducky since then, and the added power makes the old SC a whole lot of fun to drive.
My only problem now is with the air conditioner system. When I did the 3.6 upgrade, I spliced the 3.6 AC compressor hoses to the old SC AC hoses, with correct AC splicing "stuff". The hose "routing" was horrible, but the best I could do at the time. Everything worked very well, with the exception of slow leakdown of the precious R12, which has become quite expensive! Don't want to convert to R134, as R12 is more efficient, plus I still have a 27lbs left in a 30lb can!
I now would like to upgrade to new "barrier hoses", and install new and upgraded drier, evaporator, fan, etc, along with "rerouting" the hoses. My problem is with the 3.6 AC compressor.
The connectors to the compressor are integral to the hoses, and install with a bolt. I need to find a way to adapt to some sort of fitting to make things work.
In the pics you will see my car with the original hose fittings, and a pic I found somewhere on this site, with some sort of adapter fittings. Anyone know how this was done? Have not taken the hose fittings off of the 3.6 compressor, so I don't know if the orifices are "threaded" or not. I would think not, because I'm sure they are an "O ring" type seal. By the way, did the SC cars use O ring type sealing throughout the system or compression type fittings?
Any help and advice greatly appreciated.
Grant

fred cook · fred cook's Garage

Grant,

If you can remove the hoses, you should be able to cut off the "crimp" that holds the fitting to the hose, replace with barrier hose and new "crimps". Your local NAPA store probably has a crimping tool to make hydraulic hoses. It will work just as well for the AC hoses. If you buy the hose from the NAPA store, they might even do the crimping for free. This way you can make the hoses as long (or short) as you wish.

Good luck with your project!!

PS I am originally from Marietta, Ga. myself!

uwanna · 08-26-2009, 09:10 AM

The main thing I want to accomplish besides replacing old hoses with "barrier type" is to reroute the hoses. Instead if making a "left turn" coming out of the compressor, I want to orient them more to the right like in the lower pic, to get away from interference with the motor. Would sure like to figure out how the adapters were done in the lower pics!

uwanna · 08-26-2009, 05:38 PM

Any ideas guys?

80-911SC · 80-911SC's Garage

they llok the same only clocked about 20 deg off from yours

uwanna · 08-27-2009, 05:40 AM

Here's closeup pics of my hose connection dilemma! The stock ones just bolt on, but someone somehow modified the others with brass hardware to allow more flexibility. I need the hoses to exit the compressor at about 12 or 1 o'clock, instead of 9 o'clock like the stock ones do now. Any ideas how this mod was done?

Jim Sims · 08-27-2009, 08:14 AM

I suspect your compressor blocks/fittings are sealed with o-rings to the compressor flange. The modification you wish to emulate may have had the compressor flange tapped to attach the brass colored adapter fittings (not a trivial operation - the compressor likely has to come off the car); also new hose ends were added. If you are planning on also replacing all the hoses you should consider using reduced barrier hose. The fluid conveying internal diameters are the same as standard barrier hose but the outside diameters are about 40% less for more compact and flexible hose runs. Using a hydraulic/fuel hose crimping rig is not recommended for A/C hose fittings as the dies are not the correct size and can over crimp the fittings, cutting the barrier layer and promoting leakage at the fittings. If I was trying to solve your problem I would look through Doc's Blocks catalog for a solution and then contact them with your problem. They make adapters for these types of situations. The link is below.

http://www.docsblocks.com/products.asp?cat=14

uwanna · 10:51 AM

Quote:

Originally Posted by Jim Sims

I suspect your compressor blocks/fittings are sealed with o-rings to the compressor flange. The modification you wish to emulate may have had the compressor flange tapped to attach the brass colored adapter fittings (not a trivial operation - the compressor likely has to come off the car); also new hose ends were added. If you are planning on also replacing all the hoses you should consider using reduced barrier hose. The fluid conveying internal diameters are the same as standard barrier hose but the outside diameters are about 40% less for more compact and flexible hose runs. Using a hydraulic/fuel hose crimping rig is not recommended for A/C hose fittings as the dies are not the correct size and can over crimp the fittings, cutting the barrier layer and promoting leakage at the fittings. If I was trying to solve your problem I would look through Doc's Blocks catalog for a solution and then contact them with your problem. They make adapters for these types of situations. The link is below.

http://www.docsblocks.com/products.asp?cat=14

Jim,
I suspect you are right on the o-ring sealing of the original fittings. Won't know for sure till I take it apart! Removing the compressor is no problem, just need to find out a way to thread the housing to enable a good compression type fitting seal. The main reason in trying to do this fix is to allow use of the reduced diameter barrier hoses, as you suggested. Thanks for your input
Grant

UPDATE: Jim,
Went to Docs Blocks, and they look like they have the type of fittings I need! Just have to figure out which Denso compressor fitting I need.
Thanks a million for the tip. Ain't this forum marvelous!!

UPDATE #2: Jim,
Have ordered the adapter parts from Docs Blocks! The 964 compressor is a Denso 10PA15C type compressor, and is used on many Toyotas ect.
The only difference is the output block assys. Have seen this unit remanned for sale on Ebay as cheap a $100 for a Toyota, same compressor for a 964 is $175. That old "Porsche Premium Tax". They both come without the output block, you use your old one.

http://www.docsblocks.com/proddetail.asp?prod=AA1109

Once again, your info was a life saver!!

uwanna · 08-27-2009, 10:49 AM

Many KUDOS to Jim Sims for his suggestions on my dilemma!
This forum is the cat's meow!

uwanna · 08-28-2009, 06:25 PM

Just a bump for all you 3.6 transplant guys you like AC