Thank you for the clarification on the muffler and PF condenser.
Can you suggest where to go to find an idler for my application ?
The other numbers on the compressor are: CNKJ08 and 10979627.

I’ll try to tension the belt to the 100 psi. I’m in a number of car groups that use Sanden compressors and haven’t found any with belt tension near that high. In my original post I mentioned using a muffler or a cross flow condenser. Wouldn’t either one of those reduce the pulsation in the system an...

The Sanden compressor number is 5H14. Thx.

There are two groves. The OD of the pulley is 5.2”

When I restored my 77 T/A the A/C was converted to 134a. A 5H14 Sanden compressor was installed along with a new factory condenser. The system was flushed, a new O/T installed, 8 hour vacuum pulled and it held before charging. Pressures at 2000 rpm were 225 and 25. Ambient was around 75F. Discharge ...