Best Orifice tube?
Thread Starter
Supreme Member
Joined: Apr 2008
Posts: 2,342
Likes: 24
From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Best Orifice tube?
Just got done assembling my new ac system. Right now it has the stock white Orifice tube but I have seen people talk about using an orange or blue tube.
Right now the system has not yet been charged vaccumed down so it wouldn't be a problem to swap for a different tube.
I was just wondering what if any benefits would a different type of Orifice tube provide.
Right now the system has not yet been charged vaccumed down so it wouldn't be a problem to swap for a different tube.
I was just wondering what if any benefits would a different type of Orifice tube provide.
Joined: Sep 2005
Posts: 27,879
Likes: 2,432
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Best Orifice tube?
The orifice tube sets the flow rate of the refrigerant, and thus a whole laundry list of compromises; high-speed vs low-speed cooling, head pressure vs efficiency, and so on.
The white tube is correct for R-12 in a GM R-12 system. The others give better performance with R-134A in a GM R-12 system. They simply work BETTER, all around. More suited to the evaporative properties of the different chemical.
The white tube is correct for R-12 in a GM R-12 system. The others give better performance with R-134A in a GM R-12 system. They simply work BETTER, all around. More suited to the evaporative properties of the different chemical.
Thread Starter
Supreme Member
Joined: Apr 2008
Posts: 2,342
Likes: 24
From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: Best Orifice tube?
The orifice tube sets the flow rate of the refrigerant, and thus a whole laundry list of compromises; high-speed vs low-speed cooling, head pressure vs efficiency, and so on.
The white tube is correct for R-12 in a GM R-12 system. The others give better performance with R-134A in a GM R-12 system. They simply work BETTER, all around. More suited to the evaporative properties of the different chemical.
The white tube is correct for R-12 in a GM R-12 system. The others give better performance with R-134A in a GM R-12 system. They simply work BETTER, all around. More suited to the evaporative properties of the different chemical.
Joined: Sep 2005
Posts: 27,879
Likes: 2,432
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
Re: Best Orifice tube?
I usually use the red/orange one. Fits Frod; ask for like a 96 Crown Vic.
I've been told the blue one works well also but I've never tried it. Don't know exactly what Frod it fits.
I've been told the blue one works well also but I've never tried it. Don't know exactly what Frod it fits.
Thread Starter
Supreme Member
Joined: Apr 2008
Posts: 2,342
Likes: 24
From: Dumfries, VA
Car: 1985 Z28
Engine: 334 Stroker Superram 222/230
Transmission: Full Manual 700R4 / 3k Street Edge
Axle/Gears: 3.90 Eaton, Moser, Richmond & More
Re: Best Orifice tube?
Many thanks! I still have to replace the high side schrader valve so I will swap it at the same time.
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