I want to increase my compressor pressure from 145 psi to 200 psi?
by rajesh saklani
I want to increse my compressor pressure from 145psi to 200psi 60hp – 238cfm – 145psi
Rajesh, if the air compressor is not built to produce 200 PSI, then it won’t do it. If you try to ajdust the cut out pressure to a higher level, you are at risk of damaging the compressor, or possibly yourself, if the components in the compressor air circuit are not built for that pressure.
Check the specs on your air compressor to see what pressure it is rated for. If that pressure is not high enough for your needs, you need another air compressor!
Does 2 hp compressor equal 8 cfm?
by Clive Haylock
(Sacramento, Ca, USA)
Hello I have been reading through your site trying to find information that will help me purchase the right air compressor.. from reading your info I think that I might understand it but i just want some clarification..
I am buying an air ratchet that requires 5.5 scfm@ 90psi… you stated that the rule of thumb is 4 cfm@ 90 psi for every hp.. so it does that mean if i buy a 2hp compressor should i assume that it will provide me 8cfm@90psi per the rule of thumb? for example i have seen some compressors with the specs on the unit that states 3.5 scmf@ 90psi and 5.0 scfm@ 40psi and this has a motor with 1.5hp…inclosing, is there a calculation difference between scfm and cfm, i didn’t see it in your postings..
Hello Clive. Glad to see that you’ve been reading the info on the site. That’s gratifying.
Yes, the rule of thumb is that you will get about 4 CFM of compressed air for every HP of electric motor.
I also say in many places that this rule applies to compressors over 10 HP. Why? Because they will typically be powered by at least 220 Volts or more.
The compressor converts electrical energy into stored energy. That conversion process uses the electricity that’s coming from the plug. In the typical DIY shop, that plug will have 110 Volts.
There isn’t enough available energy in a 110 Volt energy supply to produce the compressed air capacity of 4 CFM per 1HP. If you were running 220, you would get that, approximately.
How to increase cfm of compressor
I’ve got a small 1.5HP, 6 gal, 2.5 CFM pancake Husky air compressor. That’s below the specs for most nailers. Could adding another 5-gal tank almost double it’s CFM?
Nope, adding another tank will just give you that much more pre-compressed air, and that means that you will be able to nail longer before having to stop and wait for the compressor to catch up.
It also means that it will take longer for the compressor to come back up to cut out pressure level.
You can’t increase CFM from a compressor without increasing the motor and/or the pump size.
What you can do is dial down the pressure on your regulator to the lowest pressure level your tool will work at. This will make your air charge last longer before the compressor has to restart to bring the pressure back up.
How do I get more pressure to fill truck tire to 120 psi?
(Waltham, Quebec, Canada)
I have recently purchased a new compressor.
Twin piston, oil base. It is suppose to develop 125psi at max.
I am typing to fill truck tires that require 120psi, but it wont go past 80 psi. The output gauge is set to 110 psi, and won’t go any higher. The tank gauge is showing 130psi, so in theory I should be able to get these tires inflated to at least 110psi. Why can’t I get more than 80psi in these tires?
Larry, “It is supposed to develop 125psi at max.”, in my opinion, the output figures of air compressor suppliers are similar to those of the mileage claims for the car manufacturers. It just ain’t so!
You are, with your reputed 125 PSI compressor output, trying to fill a tire that needs 120 PSI. It may not be possible. Not only are you pushing the envelope for the air compressor (like driving your car with the pedal to the floor all the time) but you may also have issues with the accuracy of your air gauges. The cheapo kind installed on low cost air compressors might have an accuracy of +/- 2-5 PSI from what you see on the gauge.
Now, you say that the “The output gauge is set to 110 psi,” and won’t go higher. I take this to mean that your air regulator is set for 110 PSI, and regardless of how you try to adjust it, you can’t get the gauge reading to go up past 110 PSI, even though the tank gauge shows 130 PSI?
That is strange. First, that your air compressor is rated for 125 PSI, and you are seeing 130 PSI on the tank gauge. That may be the gauge inaccuracy I wrote about earlier, yet it does speak well that your air compressor can deliver the output it promises.
You have an air line to your tire chuck? Try this. Put a connect on an air gauge, and plug that air gauge onto the air line. If it, too, sees 110 PSI, then that is all your regulator is allowing through, and that may mean a bum regulator, if it is, indeed, rated for handling up to 130+ PSI.
Perhaps you might post a comment here with results?
How to increase compressor cfm?
I currently have a compressor with 3.2HP motor running at 1040 rpm producing 11.2 cfm @ 90psi. If I install a 5HP motor running @ 3240 rpm will it produce more cfm? If so what would be the max rpm I could do?
Howdy Mack. Nice to hear from you.
If the mechanical ability of your compressor can handle the higher RPM, then yes, in theory, you could get more CFM out of it.
However, I’d be willing to bet that by up-sizing the motor, you’ll destroy the compressor mechanically in fairly short order. They are designed and built to handle the motor that comes with them.
Good luck in your experiment.
COMPRESSOR HP / and compressor flow
what would be motor rating of a compressor capable to deliver 25 cfm at 12 psi
I keep looking, but I have not found a formula that will allow me to convert the flow of a compressor at 90 PSI to the flow of that same compressor at 12 PSI, or any other number.
All I can tell you is that you should get around 4 CFM of compressed air flow at around 90 PSI for each HP of compressor motor.
What that same flow would be at 12 PSI, I can’t figure out. It would be higher, but how much… anyone out there know?
2 compressors – plumb them together to increase flow?
This sounds simple, but you know how that goes. If I want 12ish cfm can I just use (2) 6ish cfm compressors and some kind of Y connector to supply a sandblaster?
Victor, having two compressors supplying your application will increase the available flow, but whether or not you will get a true 12ish CFM or not remains to be seen.
If it were me I would have the two compressors feeding into one tank using the “Y” you spoke of, but upstream from the “Y” in the line from each compressor, you would need to put a one way valve so that air can only flow downstream to the tank, and not back into the adjoining compressor tank.
Then I would plumb the line from the tank to my sandblaster or other air tool.
I want more cfm
i have 2 extra compressors sitting in a corner of my garage, and i want to get more CFM…
my current compressor is a 3 HP, 18 gal
i want to run about 8 cfm @40 psi
do I still need check valves if I have output regulators on all 3 compressors set to the same psi, tee’d up, then run through my 3/4 NPT filter-regulator-oiler, and use the regulator on that to control working pressure? i use about 30 feet of 3/8 air hose on a reel…
if it works, i plan to put valves on all 3 so i can just run 1 or 2 and not have it charging all 3.
i am restoring old snowblowers, and find that i use air alot.
another issue is that i have had couplers freeze up in the winter, is there anything i can do to prevent this, I.E., put an ice-melting fluid in the oiler?
Joe… what, you have cold weather in Minnesota? Who’d have thought. 🙂
Bone dry air won’t freeze couplers, valves, cylinders, or air tools.
Some folks run anti-freeze through the air lines using an in-line lubricator. Not my thing.
Read the pages on air preparation or air treatment for solutions to drying air so that there is no water in the compressed air stream to freeze.
As to the air flow question, why not read Add A Tank and Add A Compressor, both linked from the site map. I hope I have explained the process fully. If, after reading, I’ve left any holes in info, post a comment here with the question.
Is it possible to create a higher CFM rating on an air compressor?
I have an air compressor with a rating of 4.1 CFM @ 90 PSI. I need an air compressor at 5.4 CFM @ 90 PSI. Is there a way that I can make this compressor give me the CRM that I need or should I go buy a new compressor?
The output of an air compressor is predicated on the pump size and the motor capacity. The designers balance these two and then take into account the most important factor… cost.
So, they decided that they would build an air compressor with 4.1 CFM @ 90 PSI to fit their particular niche and cost formula.
You could tamper with the pressure switch settings to increase the cut out pressure level. You could, also, destroy the compressor motor by overloading it in so doing.
Sorry Jay, you need to really think about how much air you need for now and the future, and then get a new air compressor with even more capacity than that. Folks almost always used more compressed air capacity than they have.
New comment? New question? Please add it here along with photos to help others help you with your compressor and equipment problem!