How to Check Compressor CFM

In this video we figured out the CFM at 160 psi but the tank is rated at 100 psi. did anybody figure it out? at 100 psi it took roughly about 5.18 minutes put that in the equation and it works out to about 11.56cfm at 100 psi which is 1 cfm off which isn't too bad for a compressor that is 10 years old. So if you want to check your CFM on your compressor you can do that following these steps.

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[MySonMarlon]

If it has 9.7 CFM at 160 PSI then i could be right what the BIG Label on the Tank says. 12.5 CFM at 100 PSI . At 40 Psi it has arround 15 to 17 CFM.

[doublebulbing]

This info came at the right time.... I look forward to trying this soon with two different compressors on the same tank to see which one I should be using

[Reloadeez]

Ingersoll Rand uses (Gallons x 0.536 x PSIG / Seconds) In your case 60 x 0.536 x 160 = 5, 145.60 now divide that by the 570 seconds to fill = 9.02 cfm at 160psi. To ballpark a 160 psi cfm to 100 psi cfm you can do (160 x (cfm - 1) /100) so in you case 160 x 8.02=1283, 1283 divided by 100 gives you 12.83 cfm at 100 psi.

[YotaMan]

Fuck Yeahhhh. Just checked my “new” compressor I got off an old neighbor guy. If this equation is somewhat accurate my compressor is the BEAST I thought it was!! 80 gallon filled to 125psi in 2:30 seconds. Woah. That’s over 30 cfm... It’s a Speedaire 7.5hp with a big ass dual pump. 40amp circuit. RAD!!

[MystikalDawn]

Looks identical to mine but mines a porter cable. Not sure what mines rated for though.

[multirole]

I know this is a dumb question., but are you measuring free air delivery or displacement volume here.

[FredFlintstone]

Do the test stopping at 100 psi. Im speculating that the higher the pressure in the tank, the longer it takes to fill the last amt of air.

[txsviking]

Good thing to know. Things like bead blast cabinets can easily out run a compressor that's low cfm.

[amanwithhiscigaretteandcof]

THANK YOU !!!
now i know how to calculate it.
👍

[SteveRobReviews]

Marketing works. The cfm traveling own a hose in different diameters must all be different as well. I have some air tools that show a cfm rating and I think their way off as well.

[quintinadossantos]

The CFM's written on the tank are really the SCFMs, right?
Los CFM's escritos en el tanque, en realidad son los SCFMs ¿correcto?

[kazykamakaze]

For a relatively new design compressor it runs pretty slow. My 70 year old pump runs at 12-13cfm and fills a 200 Liter tank at just 5mins at 125psi cut out. Maybe service your compressors valves/rings? This helped my old air compressor get a new swing at life. My broomwade compressor runs a 1400rpm 3hp old styled higgs motor and the pump is a big 'fu**-off heavy cast iron chunk, but even though it's very heavy it makes significantly less noise than the newer multistage compressors, can stand next to the compressor and talk normally with my bud without having to raise my voice.

[will]

Cool video. Good idea. Worth doing when u first get a unit to compare in the future to check on issues. Not criticizing in anyway but don't you think what you calculated here is more like the average CFM of this unit between atmospheric and 160 psi and not really CFM at 100 psi

[bohaggin]

using 1/4 inch high flow fittings on my air tools and lines made my tools wake the fuck up. (still using 3/8" hose) milton V or the cheapy aluminum husky brand work well.

[Graveltrucking]

You always could have a bicycle pump it would give you some exercise, may take a while to fill a 60 gal tank. The only time you need CFM if your sandblasting. For your use in the garage that compressor does all you need.

[greggkuzila]

I need a beer after all that s*** by the way I found my 67 Firebird brakes

[WCGwkf]

Hold up... where the hell did they trick anyone? The pump is rated to constantly put out that much air at that regulated pressure. If you had a tool, or collection of tools that used a total of 12.5 cfm, and operated at a regulated 100psi, the compressor would supply those tools continuously. You get a result of 9.5 at 160psi and somehow that's a bad thing? What tools run at 160 psi? Most tools are under 100 do idk what the problem is here.

[gato]

THE REAL QUESTION IS HOW MANY CFMS AT 90 IS IT ACTUALLY PUMPING SO THAT WE CAN COMPARE WITH THE 12.5 AT 90PSI TO SEE HOW MUCH HAS IT DECREASED WITH USAGE. cAN YOU TIME IT AT 90 PSI?

[jamesrogan]

For screw air compressors you times the kw by 5 and for piston compressors you times it by 6 that’s how you find the cfm

[ProbeGT]

100 psi is an accurate mesure because most tools run on 90-100 psi so if you want to know if the pump can sustain the tool, it os a good way. Also it seems to be a kind of "standard" manufacturers use, mostly 90 psi.