Posted by Destroked 450 on May 06, 2018 at 07:50:26 from (173.242.142.14):
In Reply to: Air Compressors posted by farmallboy15 on May 04, 2018 at 18:16:58:
You can't go wrong with one of those compressors
The 325 is rated for 3-5 hp with max cfm of 18.6 @ 175 psi
The 340 is rated for 5-10 hp with max cfm of 29.6 @ 175 psi
7 1/5 hp model will probably be in the 23 cfm neighborhood.
My 325 compressor is big, the pump alone weighs 295 lbs
The 340 is a monster with the pump weighing 480 lbs
Both are pressure lubed and rebuildable just like a engine will over sized pistons and under sized bearing available.
The unloader allows the pump to start easily and doesn't start pumping air until oil pressure is established.
That's a good deal on the 340 but it probably has a 3 phase motor and 7 1/2 hp single phase motors are hard to find used, a new one will set you back around $650-800.
5 hp motor is rated at 28 amps, uses 10 gauge wire and a 50 amp breaker.
7 1/2 motor is rated at 40 amps, uses 8 gauge wire and a 70 amp breaker
Looks like the 7 1/2 hp compressor is going to use a good bit more electricity.
Unless you really need the extra air I'd stay with a 5 hp model
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