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Rb20 Vs Rb25 Air Conditioning Compressor?

yogibear

By yogibear,
in Engines & Forced Induction

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1400r Veteran

1400r

Posted
Posted (edited)

I just kept my rb20 compressor connect to its lines but removed it from the rb20 block

this way you dont have to regas your air con

dropped in the 25 and mounted it back up

belt size may be different and your meant to hook up a extra temp sensor or something so I currently have no air con

Edited by 1400r
GTR-32U Mentor

GTR-32U

Posted
Posted

before you start fitting AC compressors look on the back if its designed for r12 or r134a gas.An R32 I imagine would be for the R12 due to its age ( correct me if I am wrong anybody ). I would be chasing up the compressor that runs R134a as you cannot buy R12 anywhere.R134a compressors run at higher pressures, Ac would still work ok I guess with the older compressor but the newer compressors work better..I am doing the same conversion right now in an AE92 corolla...bought a compressor from the 20 valve blacktop..Just shopping around now for newer condensor...good luck

Rekin Grand Master

Rekin

Posted
Posted

There are 2 different models of rb20 compressors (wouldnt have a clue how they differ)

They both are R12 gas and you'll need to convert the system to R134a if you want to regass it. (aircon mechs do this for a small price, they replace some seals or something cant remember)

R134a is not as cold as R12, so your rb20 compressor will need more effort to produce same coldness.

R33 compressor would most likely be r134a which would be more efficient than a r32 r12 compressor running on r134a gas

BHDave Grand Master

BHDave

Posted
Posted

added bonus is that the r33 compressor is smaller and lighter :cheers:

I went with the r32 compressor on mine when i converted as all the lines match up, so it's just a bolt up job. Mine was still working well at the time too so i didn't disconnect it. One less complication in the conversion.

If you go with the r33 compressor then you will need to get some custom lines made up to suit so it adds to the cost. Whether the cost of a regas and lines is less than a conversion you'll have to find out for yourself

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