134a what size orifice

[hatzie]

Originally Posted by chris989

It is what I used when i swapped from 12 to 134. I only went white fixed because I had it on the shelf and that is what is called for.

I am using a Sanden SD7,, With the fixed i could not get decent temps.. My motor runs around 2,000 or less in town.

Chris

The white GM orifice is 0.072
That's just fine for hydrocarbon R290 and R12.

You need a slightly smaller orifice for R134a and HFC152.
As I said the Ford blue is 0.067 and it seems to do the job.