Air Compressor flow rates question

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Bob's right. The flow rate of air from the compressor into the tyre is a function of the differential pressure between the compressor output and the pressure within the tyre. This flow is further affected by the restriction of the tyre valve and other restrictions in the flow path. The valve does not limit the air flow to a particular value but it does reduce the flow much as a resistance in an electrical circuit.

As Bob says, you may have a compressor capable of attaining a high pressure but not capable of delivering a decent volume. By the same token, it is futile if a compressor is capable of high flow volume but not being able to maintain sufficient pressure to deliver air into the tyre.

The published pressure and flow figures from the compressor manufacturers/retailers can give false impressions of the capabilities of their products. They usually quote 'maximum output pressure' and 'free-air delivery rate' neither of which provide adequate information of their compressor's practical performance in inflating a tyre at the operating pressure of typically 30 to 50 psi. The real test is how long the compressor will take to inflate a tyre up to operating pressure. Some reviews have tested using that as the comparative criteria, which gives a realistic assessment of the performance.

I do often wonder just what gauges are used in these compressor tests. Pressure is pretty easy to measure but air flow does require somewhat more complex instruments to achieve a reasonably accurate determination. I suspect that they may simply compute the theoretical air flow by multiplying the piston displacement by the shaft revolutions, or even worse just pulling a suitable figure out of the air. (Tell 'em what they want to hear!)

But to address your actual question..... removing the valve core would always improve the air flow just as it does in deflation, but probably without as much benefit. In both deflation and inflation the flow rate will progressively decrease as the process proceeds. However, with a decent compressor, the differential pressure can be maintained at a higher value than when deflating so the flow is also better maintained and it may not be worth the trouble of valve core removal when inflating. Better to purchase a compressor which is capable in the first place.

Its about time.
Trying to inflate 4 tyres from 10 to 16 psi up to road pressure
Takes time
Arb twin comp rules
The old style arb comp was slow as

But the boss compressor had the flow rates for many years
Untill arb did the new one and then doubled them up as a twin pack
Uses some decent battery amps but i have never ever melted a fuse holder compared to the old style ?