A big motor on a small compressor will last longer, everything else being equal, but won’t make any more air. Worn pump parts- such as the valve plate and seals-stop the pump from compressing the air and filling the tank. If the tank won’t build pressure because the pump seals or valve plate are worn, rebuild the pump using the manufacturer-approved replacement parts.
I currently have a husky 6.5 hp air compressor with a 60 gal. Use a lot of air tools for auto body repairs not daily but at least 2 days a week.
Like stated above, as long as you don’t exceed the max rpm of the compressor, it does not matter how may HP the motor is. If the new motor is slower, and larger pulley can be bought, but a larger pulley can make the motor work harder and be slower/harder to start. If the new motor is faster, a smaller pulley can be bought, but I don’t think I have seen smaller than a 2 inch pulley.
I have been doing my air compressor homework for a while. I came across a freebie air compressor that a friend gave me. Not sure how old it is, but it is an oil lubricated unit, and appears to be pretty old.
The electric motor originally on the compressor is a Dayton, 1 1/2 HP, 1750 RPM and the model number of the motor is 5K481G. I’ve added an image of the motor just below to give you some idea of the type of compressor motor we’re talking about. The logic suggests that you if you typically would get 4 CFM at 90 PSI or so from each HP of electric compressor motor, then the pump you would want would be one that would produce 6 CFM of air since you could power it with the 1 1/2 HP motor. Given that the existing motor has a 1750 RPM, when a new pump is acquired, make sure it’s sheaved correctly to give the pump the rotation it needs.
Air compressors typically have a horsepower rating between 1.5 and 6.5, though some larger, stationary air compressors can have up to 15 HP. If you are using standard electric power outlets, you’ll need an air compressor at 2 HP or less because standard AC cords require lower voltage to function. New air compressor hose First thing you’ll need to do before starting to assemble your add-on tank is to release all the air and drain any condensation from your original air compressor. You should do this after each time you use your compressor anyway to avoid rot and air compressor explosions!
There is no particular advantage to a pressure lubricated compressor over a splash lubricated compressor provided they are properly designed. Restating: to size a compressor, pick your air tool having the largest continuous demand and double it to spec a compressor suited for your shop. While it is a true two stage compressor and will deliver 175 PSI, the Sears two stage compressor, if honestly rated, would be about 2 real HP. Once the Sears two stage is drawn down to cycling it won’t quite keep up with an import 4″ air sander under load. As a side issue, I use electric sanders and avoid the whole problem of large compressors and rotary air tools with their carried over oil and water sprayed on my projects.
When looking at compressor ratings, ignore the “Hp” rating. Compressor ratings now days mean absolutely nothing. Look at the equipment you are operating and use the consumption ratings of your equipment to select your compressor or motor.
can i put a bigger pump on my air compressor Related Question:
Can you run a 3hp compressor pump with a 2hp motor?
Yes, you can run a “3 hp” pump with a 2 hp motor, but you have to run that pump at a lower speed. OR, you run the pump at a lower maximum pressure, since the power input to the pump is highest at maximum pressure.
Are air compressor pumps interchangeable?
Many of their parts can be interchangeable, such as check valves and filters. Most parts however will be specifically designed for that air compressor.
Can you run a 3hp compressor pump with a 5hp motor?
most 5hp pumps can be run at 3hp. You just gotta slow them down a bunch.
What RPM should a air compressor pump run?
Most electric motors found on compressors will operate at approximately 1,725 or 3,400 rpm. The slower rpm units generally hold more value, since they operate more quietly, generate less heat and produce less wear and tear than faster motors.
How do I choose a compressor motor?
The most critical consideration for selecting a motor in these cases is to choose one whose speed-torque curve exceeds the load torque curve. Loads from centrifugal pumps, fans, blowers, compressors with unloaders, and similar equipment tend to be variable over time.
Can an air compressor pump be rebuilt?
Rebuilding the air compressor pump restores the pump’s ability to efficiently compress air. If the tank won’t build pressure because the pump seals or valve plate are worn, rebuild the pump using the manufacturer-approved air compressor parts. Most air compressor models use a kit for rebuilding the air compressor pump.
Where is the unloader valve on an air compressor?
Where Is the Unloader Valve Located? If you own a smaller reciprocating air compressor, you’ll likely find the unloader valve mounted on or inside the pressure switch. When the switch shuts the compressor off, it actuates the valve.
What is difference between compressor and pump?
Pumps have the ability to move liquids or gases. Compressors typically only move gas due to its natural ability to be compressed. Pumps and compressors both have very high pressure rises. There are different types of compressors that move air into a chamber.
How much CFM do you need for sandblasting?
An air compressor which produces between 10CFM – 20 CFM is ideal for smaller sandblasting tasks. While a compressor which produces between 18CFM to 35 CFM is better for larger jobs where a more powerful experience is needed. While an industrial type of sandblasting needs a CFM of 50 – 100.
What is unloader valve?
An air compressor unloader valve is a device used by air compressors to release the trapped air inside the compression chamber and tank discharge line when the motor stops. This allows the motor to start up easier. In general there are two types of air compressor unloader valves, electrical and mechanical.
Does HP matter in air compressor?
HP is not as important as pressure and flow in determining if your compressor will work for you, as newer & more efficient compressors can do more with less HP! Doing more with less HP will save you energy, as well as will give you larger returns throughout the life of the compressor.
How long should it take for a 60 gallon air compressor to fill up?
It will fill within 5 minutes.
How do I know what size pulley I need for my compressor?
There are complicated formulas for determining pulley ratios but in generic, layman terms, simply divide the driven component (pump) by RPM, the driver component (motor or engine) rated by RPM to get the required ratio. In the example below, the pump RPM is 1070, for full output, while the motor is 1750 RPM.
How do you size a compressor?
The general formula used to calculate this is expressed as compressor time on/ (time on + time off) = Duty Cycle percentage. For example, if a compressor is said to use a 100% duty cycle, that would mean that the compressor provides 25 CFM and 125 PSI for 100% of the time it is in use.
What is the most efficient air motor?
The Harmonic Air Motor developed at Lawrence Livermore National Laboratory, Livermore, CA, has all these advantages of air motors, as well as more than 60% of ideal efficiency, higher low-end torque than available commercial air motors, and can be manufactured at lower cost.
