On 2009-03-28, Todd Rich wrote:
Ignoramus2902 wrote:
(snip)
20 HP, wow.

Yeah. I bought a lot more compressor than I really need, though it
is nice to know that I'm not going to run out of air for pretty much
anything I can think of doing... With 20HP though, I could kick out
69 CFM @ 175psi.

That's an insane amount. My sandblaster needs only 15 CFM. So I think
that my 340's ability to pump about 24 CFM, works fine for my
needs. Although, overnight I started having second thoughts about
swapping it for this 390.

The trouble is that the motor nameplate on my 390 that I have in my
pickup truck, has been completely erased due to unknown reasons
(likely reckless cleaning). So I can only be guessing what is the
horsepower of that motor. (I will ask our Quincy dealer)

Good luck. I'd assume at least 15hp though.

Your compressor is of similar vintage to the one in my garage (mdl
340).

This 390 is Revision 15 made in 1968. 3 years before I was born.

Hmm, I guess that means mine is 3 revisions earlier. I know I had a hard
time getting the right parts for the unloader.

Which parts?

(If I looked at the right pictures, your 390 has an unloader for
when it is running at pressure...I think that is a fixed, not
variable, pressure setting on it.) Mine was an older version that
what was shown in the manual.

I think that a pressure setting is not really the prerogative of the
unloader? That it should be an electrical or pneumatic valve that
actuates the unloader based on pressure?

Where did you get the info on what revisions were made when?


I am on very friendly terms with our local Quincy dealer, who knows
everything and gets all my orders.

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