Air Conditioning, Part 2

[john 215]

Hi,

If you are planning on fitting a modern A/C compressor then don't go bang up to date, a current compressor effectively run constantly, they are then controlled by Pulse Width Modulated Signal from the engine control unit to govern how much ' pumping ' they do, so under acceleration they are almost turned off, on cruise etc they do just enough to keep the desired temperature constant, its all about emission's now a days.

As far as using old pipes then the valves will need changing or adapting as old gas R12 uses screw on filling pipes and 134a uses a snap on type.

ALWAYS fit a new unopened receiver / drier, the silicone gel inside become clogged with moisture out of the atmosphere in 24 hours, once in there it can not be removed and so is trash.Internal moisture is the enemy of a A/C system. It clogs component's, degrades oil and will combine with refrigerant to produce an acid to corrode your system from the inside out. I always pull a vacuum for at least 1/2 hour before charging, when you vacuum the system it lowers waters boiling point, so allowing it to be sucked out as steam from pipes etc.

Cheers John


LIVE LIFE A QUARTER OF A MILE AT A TIME!

1976 Speke FHC Beauty Now with an overdrive conversion

1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!

[HDRider]

I fitted a Sanden 508 and replaced all the lines, the dryer, high/low switch, evaporator valve, and the service ports. All I kept out of the old system was the condensor, evaporator, wire harness, and the short solid line from the evap valve to the condensor.

It's a pain to replace the evap valve without removing the dash but it can be done as the pressure sensing line can be accessed through the unused speaker panel on the top of the dash with a stubby wrench. I wrapped the temp sensing line around the pressure line at the connection to the evap piping.

Edward Hamer
Petaluma CA

[sydney.wedgehead]

<blockquote id="quote"><font size="1" face="Century Gothic, Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by HDRider</i>

I fitted a Sanden 508 and replaced all the lines, the dryer, high/low switch, evaporator valve, and the service ports. All I kept out of the old system was the condensor, evaporator, wire harness, and the short solid line from the evap valve to the condensor...
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Hi Edward,

I'm curious how you mounted the Sanden 508. Did you adapt it to fit on the original TR7 (4 cylinder) mounting bracket (UKC8990)?

If so, could you please describe what this involves and post a picture?


Owen, aka:
- Marsu (570 posts, last dated 28 Nov 2011)
- omichaelshar (557 posts, last dated 17 Mar 2009)

[HDRider]

The adaptor brackets are readily available to mount the Sanden Compressor to the original Triumph mounting bracket as the York compressor was used in the early Mustangs. Just look on E-Bay, several are available. I did not bother to reuse the angle iron braket or the mount to the exhaust manifold as they seem redundent on the much smaller Sanden unit.

I did have to file the new mounts slots out a bit to get the pully alignment and added a hole to allow the original adjustment plate to fit. Other than that it was an easy swap, the original belt even fits.

The one part that I have to order special was the hose end fitting from the low side port of the compressor which has a integral service port. It needs to be a 45 degree unit but the people I got the rest of the conversion parts from only had 90 degreee ported fittings.

I also purchased a ferrel that I used to reattach the old hose end from the pressure side hose to the evaporator valve. That fitting has about 6" of metal pipe to get from the engine side of the bulkhead to the valve under the dash.

Edward Hamer
Petaluma CA

[sydney.wedgehead]

Thanks Edward.

If you have the chance I'd appreciate seeing a picture of your installation.


Owen, aka:
- Marsu (570 posts, last dated 28 Nov 2011)
- omichaelshar (557 posts, last dated 17 Mar 2009)