Kellog American 335TV Compressor

[johnyquest69]

Decided to start a new subject because of string of info. Looking at this chart, is it possible to run a 3hp motor with a 5.5" pulley? It appears it may run to high of an rpm for this size motor. Opinions please! TIA!

http://www.aircompeq.com/ka.htm

 

[Den N Ms]

Johnny,Maybe this calculator will help you out on your Quest!lol
(sorry but I just couldn't help it about the pun)
Calculator

 

[Hobo,NC]

Mine came new with a 3HP motor and a 3 1/2" pulley it was a chugger and for the most part good enoufh for the average guy. I am not advarage and want air rat now with no interruptions so used a 5 HP and I think a 5.4" pulley. It will get'er done but running it faster makes for lots of water

Water never was a issue when I spun it slower

 

[3000OH]

From this 335 info on the KA site, I infer about 1 hp for every 100 additional pump rpm...see that pump HP ranges from 3-8 and pump RPM is 400-
1000. If that inference is correct, then 3 HP might take you to 450-500-ish pump RPM. This also hinges on what your cut-out pressure is. If
you need, you can find calculators online that will take your motor RPM, motor pulley size, and pump pulley size and give you pump RPM.

FWIW, remember that pump life is inverse to speed. High pump RPMs give high output but @ cost of pump life (and noise level). Low RPM (1725)
motors are more expensive per HP than same HP motors turning @ 2x RPM. That's prob a big reason the big-box store compressors use 'em...faster
cheaper motors spinning pumps @ high RPM give impressive CFM ratings. But they live fast, die young.
KA 335

 

[3000OH]

At one time, I had found a KA chart that showed HP/pump RPM/CFM traces. Just looked for it, no luck. KA has such info, maybe customer help line could steer you to it.

 

[johnyquest69]

Thanks for all the advice! Any kind of special pressure switch I should look for when purchasing?

 

[3000OH]

One to handle correct voltage & amperage of motor, also your desired cutout PSI (though that's usually adjustable within some limits).
Might also see about an unloader valve connection, if there is one (the 335 is a 2-stage, so should have one unless it's been messed with). Take a look at Surplus Center site for some ideas.

 

[johnyquest69]

I know the compressor has a unloader valve, just not sure it works. I saw some of the pressure switches had unloader valves. I know my switch would be connected to tank, but does the unloader valve on switch connect to compressor by other means? Looking a little online, it appears I could use just a switch with a 3hp motor without having to have a "mag starter" I think it was?

 

[Hobo,NC]

(quoted from post at 16:11:38 03/15/17) I know the compressor has a unloader valve, just not sure it works. I saw some of the pressure switches had unloader valves. I know my switch would be connected to tank, but does the unloader valve on switch connect to compressor by other means? Looking a little online, it appears I could use just a switch with a 3hp motor without having to have a "mag starter" I think it was?

Unloader is built into the compressor are mine is.

Switch

 

[Dusty MI]

Check the amp rating at the voltage you intend to run your air compressor. Then be sure that the pressure switch is rated at 25%
more than the motor draws.

Dusty