Quote Originally Posted by Ron View Post
Something don't sound right to me here??
Using your numbers, you would be decreasing the orifice diameter which would mean the refrigerant would flow through slower. That would mean longer cycle times, which would increase high side pressure. I always heard that people used VOVs on a D to lower the pressure because 134a has higher pressure than R12 (for 70°F and greater, which I know is true). Seems you would be making a bad situation worse. What am I missing?
The smaller diameter would make for higher "high side" pressures and lower "low side" pressures. But I would think it would make for shorter cycles because the low pressure switch would keep tripping. Not sure how it would effect on proformance.

I will say that it's been my experince that converting r12 to 134a just never works as good. New cars are great, but the conversions suck. That's why I'm keeping mine R12.