AC hose diameter?

[wholberg]

I'm tired of searching and reading threads that don't give the answer.

What are the hose sizes for an 84-89 factory AC?

Thanks in advance.

Walt

[rfuerst911sc]

There are 3 sizes at least there is on my 83SC. I'm going by memory and they are #6,8 and 10 depending on which hose your talking about.

[Jim Sims]

Usually evaporator to compressor is no. 10 (1.0" OD); compressor to engine decklid condenser is no. 8 (.906" OD) and from deck lid condenser forward to a second condenser, to the receiver/drier to the evaporator is no. 6 (.75"). These are the standard hose OD's. Be aware I have seen various exceptions especially between the compressor and the first condenser and other irritations like a no. 8 fitting to a no. 6 barb/ferrule (a legitimate fitting but odd) on a no. 6 hose. I don't know if the factory did this or a later repair.

[griffithstech]

Assuming atypical factory air,

compressor to evaporator, #10,

compressor to deck lid cond, #8,

deck lid cond. to drier or to a front cond., #8

front cond. to drier, #6

drier to exp. valve, #6


#10, 1/2" id, 1" od

#8, 13/32" id, 29/32" od

#6, 5/16" id, 3/4" od

zzzzzzzzzzzzzzzzzzzzz

[88911coupe]

Good info...but can't help but wonder why the variances in diameter?

[DaveMcKenz]

Originally Posted by 88911coupe

Good info...but can't help but wonder why the variances in diameter?

Progression of gas to gas/liquid mix to liquid = #10 to #8 to #6. Gas taking more volume than the liquid condensed from it.
Dave

[RSTarga]

yes you want to keep it a liquid until it hits the expansion valve, and a gas until it gets to the compressor.

[88911coupe]

OH...ok, that makes sense. With that in mind, if I have, for example THREE condensers should I drop the last "leg" going into the final condenser to a #6 hose...or should they all be #8 up to the receiver/drier?

[kuehl]

All depends upon the design.
You would want 6 as soon as you have liquid.

[88911coupe]

Thanks Griff, I guess to be on the safe side you would not go to #6 is there's a chance its not in a liquid state? I have added a 12X12 condenser with a fan in the rear wheel well but the other 2 condensers are the original factory versions and determining whether or not its in a liquid state is way beyond my capability. It would also vary by ambient temps and conditions...correct?

[kuehl]

We have been running tests in my black top 87 cabriolet, 3.5 supercharged, for the past 1.5 years, using the following sequence:

1) the Rearward Kuehl serpentine Condenser mounted behind LH rear tire
2) the Duehl Kuehl serpentine Condenser mounted in front of the LH rear tire
3) the Kuehl serpentine Front Condenser in the stock front location
http://griffiths.com/product/kuehl-fender-condensers/

#6 liquid line starts at the exit of the Rearward Kuehl serpentine Condenser.

In your scenario Buck, if you have a fan on the rear fender condenser and that condenser is after your deck lid, you can go liquid line 6 on its outlet port.
Some very early 911's had just one single deck lid condenser with a #8 in and #6 out, however they had issues simply because the market (climate) they
were ending up in was not what they were designed for.