Mike Mc

I'm trying to put A/C in my Power Wagon. It has a first gen diesel with the A/C compressor.

In effort to match the condensor with the A/C compressor I need to know how many cubic inches the pump puts out per revolution.

Thanks,
Mike

Buddy Stewert

I would match the one from the truck you got the engine from.

Mike Mc

Thanks for the reply Buddy, I'm in the process of making the old power wagon an extended cab so the A/C needs to work at peak to keep the large cab cool.

I've been doing lots of reading about A/C units and it appears the condensor is the most important part of the unit. With 2 decades of improvements there switching to thin flat tube style condensors so more area to cool the refridgerant. While the round tube cond. only the gas touching the outer part of the tube is getting cooled to liquid. While the gas in the middle of the tube is not being cooled and turned back to liquid.

Since this is going to be a pain in the edit to put A/C in it I want to do the best job I can. So thats why I need to find out the cubic inches per revolution the pump puts out so I can get the matching condensor.

Anybody?

TRENDZ

You might just want to work your answer out with a different formula... (how much space do I have/ how big of a condenser will fit in that space) You cant hurt your a/c performance by going to big.

SORTIE

I don't know the answer to your question but that is one cool project you are undertaking

love those old Power Wagons and have always wondered why they were gassers

maybe368

Because gas was 32 cents a gallon ...Mark I know that diesel was also cheaper, but, I had a MB 230d in the early 90s and it was hard to find diesel in town. I had to go out to the truck stops...

patdaly

Believe it is a Sanden?

If so, you can get detailed info by contacting them.

http://www.sanden.com/index.php?id=AAUYOIFBS

Also, some specifics here:

http://www.heco.net/maincat/compressors.pdf

Mike Mc

Trendz, I got lots of room up front for a condensor but not much room under the dash for the unit since the engine sits 9" back into the cab. The helpful link Patdaly posted says the condensor needs to match the pump. I'll measure my pump to find out which one I have then get the correct size condensor. Thanks Pat!!!

Sortie, thanks for the positve reply! This is my 3rd time rebuilding this old truck. The 1rst time I did a 50/50 job. 2nd time I did a pretty good job. Now this time I'm trying to do a great job so I don't have to do it again.

Jim Lane

Sanden's are easy to decipher,

Sanden SD709 =
SD (Sanden Wobble Plate Piston Type Compressor)
7 (7 Cylinders)
09 (approximate Cubic Inches per revolution)

More accurately,
9.5 cubic inch
154.5 cc displacement

From all of the many trips I have taken down the information superhighway I have yet to find much techinical data on the old C-171 compressor but I have been told the C171 compressor is.

170cc displacement.

Nothing says you have to have the condenser in front of the radiator or in front of the truck for that matter, I have built my own shroud and added electric condensing fans to a modified condenser and stuck it in the rear of a vehicle.

You can stick a remote condenser anywhere.

http://www.nostalgicairparts.com/air...-shroud-33.php

Download this PDF file, I have had this for a few years and starting around page-6 there is a lot of of good information and guidelines to build a system and live by.

Download these files and keep them in a folder named Useful AC Information

http://www.sanden.com/originals/imag...uide_Rev.2.pdf

Also 7.3 Pressure or Pumping Test on page-14 is a good test I use to check for a weak or failing compressor.

I also use this chart for determining the correct amount of oil to add to a new compressor.

http://www.rtitech.com/downloads/New...Compressor.pdf

The correct amount of oil is very important.

Jim

Mike Mc

Jim, I've gone through all the helpful info you posted. Lots of good stuff. Thanks for taking the time to post it!

Since most like pictures of this old truck here are a couple more.

SORTIE

keep the pics coming, Mike!

that is one Mean Machine with the CTD in it, and I bet you can actually hear your tunes over its roar with that speaker setup!

the nicest, most knowledgeable comments I get on my 1st gen are at big-rig truck stops...

Mike Mc

Sortie, I hope to keep this truck till I die. The woman is not to happy about my way of thinking. But I tell her we paid $45,000 for our 4x4 Duramax and I ain't going to keep buying new trucks that I can't work on. This my way of looking at it, "Keep it simple stupid"

With the old power wagon having F-350 cross over steering and hydro booster along with 4 wheel disc brakes. It drives strait and has good brakes.

Best of all it's got a CTD with 7.3 F-350 cooling system so it has no heating issues when towing on hot summer days.

maybe368

Cool rig What dies the pto run?...Mark

SORTIE

Mike, women are NEVER happy with what we're spending on our rigs

that's why I buy mine a new SUV every few years, so I can compare the payment on the note to my maintenance/improvement costs

fortunately my daughter loves my rig so I don't care what wifey and her daughters think of it

whereswaldo250

Mike MC, I remember reading your build a while ago, what year is it again? Hope to do something like this in the future.