# 921.166400 1HP, 2 SCFM compressor used for spray painting?

by Don
(Gettysburg, PA)

Sears model # 921.166400. It is 2 SCFM, 1HP. Is there a paint sprayer that can be used with it? I'm thinking LVLP. Any suggestions?

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Don, with this air compressor you do not have high volume. You get some volume, but not what I would determine as high.

Turn the issue around.

Find the spray painting equipment that is right for the job you want to paint, and read the specs of the paint gun. That will tell you the flow and pressure needed for that equipment.

Then, remembering that you will get about 3-4 CFM of compressed air at 90 PSI for each HP of air compressor motor size, you can do a pretty good estimate of what size of air compressor you need for the painting job.

Bill

### Comments for 921.166400 1HP, 2 SCFM compressor used for spray painting?

 Jul 12, 2013 Which compressor? by: Don Wouldn't a compressor capable of driving an HVLP sprayer (10 - 13 CFM) most likely be driven by 220V 3-phase at least? Or also likely be powered by a gas or diesel engine? Maybe at least a 5HP gas engine?_______________Compressor manufacturer's play with the CFM outputs of their compressors, some of them suggesting ridiculous compressed air outputs, far more than is capable of a 120 volt motor.So, yes, once you are into the realm of 10+ CFM of flow at 90 PSI compressor, you are moving into the 220 volt motor power supply.B.

 Jul 11, 2013 Maybe this one? by: Don I was thinking of the SPRAYIT SP-33500. It's a LVLP gravity-feed mini sprayer requiring 2.4 to 3.3 CFM at 30 psi. Looking at some web pages that talk about SCFM, ACFM, CFM, etc I did a test and some calculation. It is a 12 gallon tank (1.604 cu ft), and in one minute it attained 40 PSI on the gauge (2.721 atm). So the calculation (1.604 X 2.721) told me I can at best get 4.364 CFM. Accounting for altitude, humidity and temperature I'd say in reality it will be more like 3 actual CFM. This is within the range required by the sprayer. I am not familiar with factoring in the required 30 PSI that the volume must be delivered at. Since the specs on the compressor say it delivers 2 SCFM, I wonder if it will suffice for this sprayer. Does it sound like the kind of analysis you were suggesting? I am not doing large surfaces. I am doing bicycle and motorcycle frames and parts, using acrylic urethane primer, sealer, paint and top coat. ____________________Don, if you are painting intermittently, and don't mind waiting for the compressor to catch up when your air pressure drops too far, then it might work.Consider adding another tank. Yes, it will take longer for the compressor to fill both tanks, but then, you'll have more pre-compressed air to use on a small paint job.Mind you, with the price of smaller air compressors, adding a tank might equal the cost of getting a bigger compressor.I would try this compressor for a small, small job at home. I sure wouldn't want to be painting parts for a living with it.Good luck.Bill

## Craftsman model 919.165190 compressor blows breaker within a few seconds of operation

by Stuart Redman
(Saint Paul, MN)

Tank

Hi,
The affected tool is a Craftsman model 919.165190 25 gal. light duty, oiless compressor.

For more details, please see the pictures.

Unloaded, with the pressure line to the tank disconnected, the motor turns at 1/2 speed for a few seconds and then the breaker blows.

It is plugged into a 20A branch with 12 gauge wire that is no more than 20' from the panel. Here is what I have done for troubleshooting:

1. Tried a different circuit.
2. By-passed the pressure switch and ran current directly to the motor.
3. Tested the run and start capacitor. Had to remove a diode from the start capacitor for proper test. Both capacitors tested good.

4. Traced all visible wiring runs for a possible fault.

None of these improved the situation. Is it safe to conclude the motor is toast or is there another possibility?

Stuart
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Excellent post, particularly with the information and photos Stuart. Thanks for that.

In your shoes I'd select the motor as the likely culprit. Is it the motor toast? Possibly.

Some compressor motors have centrifugal start assist on the motor shaft inside the housing, and if yours is one and the start assist has seized, then that might account for the excessive current draw and the breaker blowing.

Certainly, I would take the motor to a rebuild shop and ask for a start and run test before tossing it, as they are getting very expensive.

I hope others with this same compressor can chime in here as well.

Cheers,

Bill

### Comments for Craftsman model 919.165190 compressor blows breaker within a few seconds of operation

 Jul 29, 2013 Follow-up by: Anonymous I checked the centrifugal switch and it moves freely and its contacts and clean.The motor repair shop wants 30.00 to test the motor. Since then I've bought a new heavy duty compressor (I wanted a better one anyway so this was a perfect excuse for an upgrade), and have little interest in spending time/money on the old one. My only thought is if I could repair it for a small amount of money, I could sell it and recoup some of the cost of the new unit.Do you have any recommendations for discarding the old compressor besides the used appliance/recycling bin at the landfill? Is there a market for the old tank and hardware?Thanks,Ed_____________I would expect that some of the parts for the old could be spare parts for the new.You could put a posting on the "compressor parts wanted" page, offering your compressor for parts for someone with the same or similar makes. Make sure you include a picture or two to help folks recognize it, indicate where in the world you are, and, put contact information in the posting so people interested can contact you directly.B.