Saturday, Jun 13, 2020 at 19:58
You will never find any portable or workshop compressor that produces a genuine 200 psi - and if you did, why would you want that kind of incredible pressure?
Workshop air compressors normally operate at 110-120 psi, air
tools work satisfactorily at 90 psi, even the heaviest loaded truck tyres only take 115 psi maximum.
You should not use air dusters at over 60 psi or you risk bodily damage.
The important part of air compressors is ensuring their claims of actual Air Output, actually meet Free Air Delivery (FAD) measurements.
FAD is the measured level of air output (in CFM or litres/min) - as compared to "calculated air output" based on the air compressor cylinders, measured displacement.
Measured displacement is not the FAD capacity of the air compressor, FAD is usually around 50-60% of the measured displacement.
Then there are other factors involved, such as Duty Cycle (the length of time you can run the compressor before it needs to be shut down and allowed to cool) .
Air compressors generate enormous heat, and many have inadequate cooling - of both motor and compressor unit. Oil-less models are the worst for this.
The amount you pay for the compressor is generally a good guide to the output and reliability of the unit.
Buy anything under $120 and you will only get a very basic unit that will have low output, low duty cycle and a relatively short life. You will need to spend $250 or more to get a quality unit.
The better 4WD portable 12V compressors have good quality rubber mountings on a solid base, have an air output that meets their claims, and have a good length duty cycle - and preferably, a remote switch.
No point in buying a compressor that needs to be shut down every 5 mins because it needs to cool down.
There's some good units in the link below, just select the best you can afford.
Superior Engineering
Cheers, Ron.
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