Originally Posted by clinebarger
Originally Posted by user52165
FWIW - 3450 is a very common rpm for AC motors. But it does not have that much affect for noise. The pump rpm would depend on the pulley sizes but would be less than motor rpm. Design of pump, oil capacity, number of cylinders, mounting, insulation, etc are all a factor for noise.
Something like this helps, but is a crutch for a poor design:
https://smile.amazon.com/Pack-Anti-Vibration-Rubber-isolation/dp/B002IA0WPI/ref=sr_1_13
Every compressor I own has a 1750 rpm motor & are quiet compared to just about any 3450 rpm motor equipped compressor no matter the pulleys/configuration.
I have my Kellogg American on hockey pucks as it was walking across my smooth concrete floor, I didn't notice much sound reduction but it's not all that loud to begin with.
My ancient Mills is welded inplace up high in my small shop/garage, Granted it does have quite the reduction & lumbers along at @ 400 pump rpm.
I've been wanting to do that spray foam insulation to my garage and pole barn. How do you like it?