wrote in message
oups.com...
I have just got my new 100 Litre (3hp) upright compressor and notice
that its only charging to 7bar.

I wondered if the gauge was inaccurate, but its got 2 and both read
almost exactly the same.. As I final test, I have a engine compression
tester which I connect and indeed its at around 7 bar.

Is there any reason why I should not adjust the 'cut off' so that it
fills to 8bar? If it has 8 bar in the tank as opposed to 7, then I
assume am going to get more air out (100 litres more), but its
obviously going to take longer to charge and will put extra pressure on
the tank and fittings.

Has it been set to 7 intentionally, or is it normal to 'fine tune' it
during its first few used?

Any info would be appreciated

Jon


Most likely your compressor was set at a cut off that is most efficient for
the design of your compressor. If I remember correctly, 1 bar is just over
14 psi. That puts your compressor at ~100 psi. That's normal for a home use
compressor. Raising the pressure to ~114 psi PROBABLY isn't dangerous, but
would add extra strain to your motor and compressor without giving you much
benefit. I certainly wouldn't try to raise the pressure any higher.
Compressed air can be very dangerous.