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Old 05-18-2010, 09:13 AM
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AC and crank pulley

I have a 78 Monte Carlo 383 small block daily driver. The AC has been converted to R134. Since then, I have replaced the compressor twice. One mechanic thinks my crank pulley is too big. It's a 3 grove (long neck water pump) 7 and 5/8 inch pulley. I think the original 305 small block is 6.6 inches. Do I have to swap out the pulley? Is anyone running a 383 small block with AC and the larger pulley? Any advice much appreciated.

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Old 05-18-2010, 03:51 PM
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What failed on the compressor and how was it converted.
All rotational parts are designed to work in a certain rpm range. You have changed the rpm range quite a bit with that larger pulley.
I have also seen many r134 conversions done wrong, wrong oil, wrong orifice etc.
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Old 05-18-2010, 05:17 PM
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I don't know exactly what elements of the compressor failed except to say that it seized up on the highway with a howl. I pulled over and cut the AC belt off.
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