Randall Young wrote:
>
> 80 gallons is about 10 cubic feet, and standard pressure is about 15
> psi, so at 105 psi your tank holds about (105/15 * 10) = 70 scf, about
> 100 scf at 150 psi. So, your compressor is producing about 30 scf in
> 6.5 minutes or about 4.6 scfm.
>
> My guess is the rings and cylinder walls are shot.
>
> Randall
>
Randall,
Thanks for the arithmetic -- intuitively I knew it was too slow,
but I was looking at the figures and blanking on how to approach
the calculation. :)
Unless he has run tons of hours on it (thousand+), it might not
be the rings and bore (with the iron and oil lubed pumps, the
bore has a pretty easy job), maybe he just has a sticking valve.
Pull the head and check them before you get too serious about it.
If you have been using regular automotive motor oil in it, it
will be prone to sticking valves. You may be able to just pull
the valves, clean then up and be as good as new. Sticking valves
generally is given as the reason you should use compressor oil
instead of motor oil (I'm not saying you have been using motor
oil, though, and sticking valves is a more common problem than
bore wear on most iron/oil-lubed pumps regardless of what oil you
use).
Good luck!
doug
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