AC Orifice
#1
Member
Thread Starter
Join Date: Oct 2007
Location: South Jersey
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Car: 86 WS6 TransAm
Engine: LG4 4BBL
Transmission: T5WC
Axle/Gears: 327
AC Orifice
Where is the orifice tube located?
Last edited by 426 Wedge; 05-25-2015 at 04:47 PM.
#4
Supreme Member
iTrader: (1)
Join Date: Sep 2005
Posts: 26,099
Received 1,683 Likes
on
1,278 Posts
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: AC Orifice
Zackly...
Right at the evaporator.
Undo the fitting connecting the smaller line to the evap. It is a plastic thing jammed into the line going into the evap.
If you're retrofitting to R-134A, Get the Frod red/orange one. Ask for about a 96 Crown Vic one at the parts store. It happens to have an orifice size that matches the needs of a GM R-12 system filled with R-134A, better than any of the GM orifices designed for R-134A do. I have been told that the blue Frod one also works, don't know what to order to get that though, and I've never tried it so take it for what it's worth.
Right at the evaporator.
Undo the fitting connecting the smaller line to the evap. It is a plastic thing jammed into the line going into the evap.
If you're retrofitting to R-134A, Get the Frod red/orange one. Ask for about a 96 Crown Vic one at the parts store. It happens to have an orifice size that matches the needs of a GM R-12 system filled with R-134A, better than any of the GM orifices designed for R-134A do. I have been told that the blue Frod one also works, don't know what to order to get that though, and I've never tried it so take it for what it's worth.
#5
Supreme Member
iTrader: (2)
Join Date: Sep 2006
Location: Houston, TX
Posts: 2,118
Likes: 0
Received 14 Likes
on
11 Posts
Car: 1989 GTA
Engine: SuperRam 350
Transmission: Pro Built S/S TH700R4
Axle/Gears: 3.27
Re: AC Orifice
(GM) White 0.072
(Ford) Blue 0.067
Red 0.062
Orange 0.057
Green 0.052
Brown 0.047
The stock orifice in our cars was the white 72. Most people recommend going for the Ford blue 67. I would recommend the blue as a nice upgrade to pretty much anybody. As for the red 62? That really depends. If you spend a lot of time in rush hour gridlock, it's alright. If you spend most of your time on the highway, stick with the Ford blue 67.
Here's the deal with orifice sizes. The smaller the size, the better refrigerant flow you get at idle/slow traffic. But the smaller the size, the worse you get during highway speed driving. This is why a NYC cab driver would do well with a small orifice while a weekend highway cruiser in sparse traffic won't see the benefit. Running at highway speeds with the smaller orifice raises the high-side pressure and puts more drag on the compressor.
(Ford) Blue 0.067
Red 0.062
Orange 0.057
Green 0.052
Brown 0.047
The stock orifice in our cars was the white 72. Most people recommend going for the Ford blue 67. I would recommend the blue as a nice upgrade to pretty much anybody. As for the red 62? That really depends. If you spend a lot of time in rush hour gridlock, it's alright. If you spend most of your time on the highway, stick with the Ford blue 67.
Here's the deal with orifice sizes. The smaller the size, the better refrigerant flow you get at idle/slow traffic. But the smaller the size, the worse you get during highway speed driving. This is why a NYC cab driver would do well with a small orifice while a weekend highway cruiser in sparse traffic won't see the benefit. Running at highway speeds with the smaller orifice raises the high-side pressure and puts more drag on the compressor.
#6
Supreme Member
iTrader: (2)
Join Date: Jan 2005
Location: Hurst, Texas
Posts: 10,030
Received 392 Likes
on
335 Posts
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: AC Orifice
(GM) White 0.072
(Ford) Blue 0.067
Red 0.062
Orange 0.057
Green 0.052
Brown 0.047
The stock orifice in our cars was the white 72. Most people recommend going for the Ford blue 67. I would recommend the blue as a nice upgrade to pretty much anybody. As for the red 62? That really depends. If you spend a lot of time in rush hour gridlock, it's alright. If you spend most of your time on the highway, stick with the Ford blue 67.
Here's the deal with orifice sizes. The smaller the size, the better refrigerant flow you get at idle/slow traffic. But the smaller the size, the worse you get during highway speed driving. This is why a NYC cab driver would do well with a small orifice while a weekend highway cruiser in sparse traffic won't see the benefit. Running at highway speeds with the smaller orifice raises the high-side pressure and puts more drag on the compressor.
(Ford) Blue 0.067
Red 0.062
Orange 0.057
Green 0.052
Brown 0.047
The stock orifice in our cars was the white 72. Most people recommend going for the Ford blue 67. I would recommend the blue as a nice upgrade to pretty much anybody. As for the red 62? That really depends. If you spend a lot of time in rush hour gridlock, it's alright. If you spend most of your time on the highway, stick with the Ford blue 67.
Here's the deal with orifice sizes. The smaller the size, the better refrigerant flow you get at idle/slow traffic. But the smaller the size, the worse you get during highway speed driving. This is why a NYC cab driver would do well with a small orifice while a weekend highway cruiser in sparse traffic won't see the benefit. Running at highway speeds with the smaller orifice raises the high-side pressure and puts more drag on the compressor.
Thread
Thread Starter
Forum
Replies
Last Post