Engine Size: 5.7
Refrigerant Type: R134a
Country of Origin: United States
I building a "hybrid" system. I'm using a compressor (and engine) from a 2001 Camaro in a Mazda RX7. I'll be using the Mazda evaporator/expansion valve, and universal condenser/drier. Does anyone have any input to help me decide how much oil to put into this system. I'll be using R134a and flushing out the mazda evaporator. The factory specs for the two systems are:
3.4 to 4.7oz Mineral oil
The camaro definitely has much more oil per volume of refrigerant than the mazda (about twice as much). I'm guessing the compressor dictates the amount of oil for the most part. Since the hybrid system will most likely take less refrigerant than the camaro I think I should also put in less oil than the 9oz. Should I make a guess at the amount of refrigerant it will take and keep the same proportion of oil that's spec'd for the camaro?
The V-7 has an oil sump. Most of the system's oil stays in there instead of moving around with the refrigerant like the non-sump Denso system would. So I'd say stick with a full 9 oz of oil.
Do not try to flush thru an expansion valve, disconnect it from the evaporator to flush the evaporator.
How big is your aftermarket condenser in relation to the stock RX-7 condenser? Is it a parallel flow unit like the stock condenser? If if is the same size and type then I would suggest you put in just a hair under 2 cans and see what the pressures look like, and what the performance is like, then adjust up or down.
When you have it up and running, let us know how it performs versus the stock setup. The stock system in my '94 is on the weak side, IMHO.
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