I thought there was one that had some suggestions about the RPM a compressor should turn. Flywheel/sheave on the compressor is 14″ diameter. Where could I get one of these without paying an arm and a leg.
These parts and processes seem simple enough, but compressor specifications can get complicated. Rating the cfm and horsepower of a compressor can be done using multiple methods. The most commonly misunderstood compressor rating is cfm.
The pounds per square inch depicts the air compressor’s amount of pressure, while cubic feet per minute indicates the volume of air supplied by the air compressor. Our topic mainly focuses on what rpm should an air compressor pump run, but we have added more on the hacking tricks to boost your air compressor speed. Maintaining a cool air intake will save your air compressor time and energy, as compressing cool air is easier than compressing warm air.
“If you go with the 3450rpm motor b384 it will be 230-volt single phase. Make sure you have a 25 amp breaker and your pulley size would be 2.75 inches that will set your compressor rpm at 791 or 2.90 inches with that motor will set your compressor speed to 835rpm which you should be ok.” “The 5 hp rated at 15 amp is really only a 3hp motor and that’s the reason they hang spl=special, the sticker shows 5 hp but when you look at the amps it is only a 3hp motor which is most commonly found in home use/ big box store compressors. Now the 3 hp rated at 22 amp is a stronger motor which would be the b384 motor which has the 7/8 shaft and is also used in the home use they will state it can be a 4.5, a 5 hp, 5.5, and a 6.5 hp motor we call them a 4.92 horsepower motor they are shy a few amps for a true 5 hp and whoever uses them states spl= on them, as well on the tags the tanks will display 6.5 horsepower but the motors never will show the horsepower if that makes sense.” If you have any questions regarding air compressor motor pulley sizing, please leave a comment below, with a photo if applicable, so that someone can help you!
07-26-2011, 07:24 AM #11 I also ran into a problem going the other way, bought a new 7-10HP rated pump and tried slowing it down to run off of a 5HP motor, didn’t work, the centrifugal unloader was not turning fast enough to let the compressor load, ended up having to go shopping for that 10HP single phase motor sooner than planned. 07-26-2011, 11:01 AM #12 Seems to me that the build quality of the compressor has to be a major factor to consider before deciding whether it is safe to run close to 100% or higher. 07-26-2011, 12:38 PM #13 seems to me that the build quality of the compressor has to be a major factor to consider before deciding whether it is safe to run close to 100% or higher.
If you must buy a 3450 rpm motor, you will probably need to cut those pulley sizes in half to maintain proper pump rpm. Whatever you do, don’t buy a fake 5hp motor like the kind you see on many cheap “Cheater” 5hp compressors. Good 5hp single phase motors aren’t cheap, so be aware of that fact when looking for one.
best rpm for air compressor Related Question:
What RPM should an air compressor run at?
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.
What CFM is best for a air compressor?
Air tools made for general use with portable air compressors typically require 0 to 5 cubic feet per minute (cfm) at 70 to 90 pounds per square inch (psi), whereas with larger tools connected to stationary systems, the requirements usually exceed 10 cfm at 100 to 120 psi.
Is higher CFM better air compressor?
A compressor with a higher CFM rating can deliver more air and is better suited for heavier applications, such as operating air wrenches and framing nail guns.
What is a good horsepower for an air compressor?
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.
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.
What PSI should I set my air compressor?
Most air tools require between 70 and 90 PSI. Any light-to-medium-duty air compressor can easily handle 90 PSI, but you always want the compressor to supply more flow than needed. Pro Tip: Always respect a PSI rating. If you don’t supply enough air volume, the tool won’t operate correctly.
How much CFM do I need?
How do you calculate CFM for a range hood? Determine the volume of your kitchen. Multiply that number by 15, the standard number of times a range hood should exchange all the air in your kitchen per hour. Divide that number by 60 to get the minimum cubic feet per minute for your hood.
What size air compressor do I need for my garage?
For your home garage, a compressor size in the 2.6-gallon to 20-gallon range should do nicely. Sizing your compressor really depends on the type and number of air tools you intend to use.
Is 4.5 SCFM good?
Even the smallest compressor can provide 60 and 90 PSI of pressure needed to run an air tool (check the tool’s manual for specific recommendations). However, most tools require a great volume of air to run at peak performance: Anywhere from 4 to 5 SCFM up to 15 to 20 SCFM or more.
Does tank size matter air compressor?
Tank size matters—sometimes The compressors we chose have tanks ranging from 1 to 6 gallons. A larger tank holds more air and will allow you to use more air before the pressure drops and the motor kicks on to refill the tank. That might let you avoid stopping work while the compressor refills the tank.
Is a 6 gallon air compressor good for air tools?
Tools that require only quick bursts of air, like pneumatic brad nail guns and finish nail guns, drain the air tank much more slowly. For these tasks, 2- to 6-gallon tanks are sufficient.
Is 150 psi air compressor good?
You’d only need maximums beyond 150 PSI for jobs such as automotive repairs and industrial purposes. Air compressors that do not reach a max of 90 PSI will struggle to power pneumatic tools. But they do a great job inflating sports equipment, bicycle tires, and car tires.4 days ago
Does air compressor HP matter?
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 many horsepower is a CFM?
If you know how much horsepower your motor makes, you can estimate its air flow in cubic feet per minute (CFM). For example, a 1,600 cc motor in a good state of tune requires about 54 cubic feet per minute to make 78 horsepower.
Does a smaller pulley spin faster?
Pulleys of Different or Same Size If a smaller pulley turns a larger one, the larger one will turn slower, but with more power available at the shaft. If a bigger pulley turns a smaller one, the smaller one will turn much faster than the bigger one but with less power available at the shaft.
