On 15 Aug 2018 20:14:15 GMT, dpb wrote:

Depends on whether you're replacing the motor, too... or whether by
"entire" you mean the motor _and_ pump.

Of course, if you by a matched set together, they'll fit; if you by
separately, then "yes, it does matter" in that since the pump bolts to
the face of the motor, they have to be of commensurate dimensions.

Mea culpa.
Yes. I had meant the whole thing.

1. It seems if I replace the whole thing, not much matters other than the
1HP spec ...
2. But if I replace just the motor - then the 56C frame matters a lot.

Thanks for asking a clarifying question, as I was remiss in not being clear
that I meant replacing "both" the motor and the "jet pump impeller" or
whatever that heavy steel end is called.

Interestingly, the motor plate says "jet pump motor", but, as far as I can
tell, it's just a "motor", right? (the heavy steel part is the 'jet' part,
right?)

I mean, what's different about a "jet pump motor" from a "motor" when the
jet pump part is *outside* the motor anyway?

BTW, here's a video of a "jet pump" being disassembled:
https://youtu.be/Jc0ardpRFSk?t=631
where they say the pump is "stainless steel".

It should just be called a "motor" or a "pump motor" but the motor doesn't
appear to be any different for a "jet pump" than for a "regular" pump.

Q: What's different between a "jet pump motor" and a "motor"?
Looking that up.... this Popular Mechanics article explains jets a bit:
https://www.popularmechanics.com/home/how-to/a152/1275136/

Apparently, if plumbed for a "2-pipe jet assembly", it helps the well pump:
https://hips.hearstapps.com/pop.h-cdn.co/assets/cm/15/05/54c8014f42d24_-_lg_3251_2_lg.gif

So, in this case, the motor part appears to simply be just a "motor", and
not really a "jet pump motor"; it just happens to be attached to a
cast-iron assembly that can be used as a "jet", it seems.

The "jet pump" can be used to assist a deep well - but mine isn't being
used that way (apparently).

BTW, this FAQ says the motor should be sized such that the pump runs for at
least 2 minutes, where mine ran for 3 minutes from an overnight discharge.
http://www.flotecpump.com/ResidentialPage_resource_faq_jetpump.aspx

The problem they wish to avoid they call "rapid cycling", so I will listen
tomorrow if I can to a normal cycle to see how long the pump runs where I
will time it to see if it's at least 2 minutes (which I never knew mattered
until now).