1930 Elto Senior Speedster Water Pump Impeller

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Buccaneer
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1930 Elto Senior Speedster Water Pump Impeller

Postby Buccaneer » Mon May 21, 2018 7:10 pm

Is this water pump impeller on "backwards"?
Looking at the steel rotor, one would think
it would work better as a "scoop" if it were turned
over, instead of a kind of positive displacement.
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Garry in Tampa
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Garry in Tampa » Tue May 22, 2018 1:16 am

Nope - than's the way they were. Virtually unchanged on the larger outboards (Elto Fleetwin, Evinrude Sport Four, Speeditwin +) until they went to rubber impellers in the early 1950s . . . 8-)
- - - - 1941 Speeditwin - - - -
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Buccaneer
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Buccaneer » Tue May 22, 2018 7:53 am

Thanks Garry, from what I'm learning about this Speedster,
it sounds like it's water cooling system is force ram first,
then the impeller booster.

SquierKA39
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby SquierKA39 » Tue May 22, 2018 9:11 am

The impeller is more of a squishing than a scooping. Look at how the newer OMC rubber ones work. When in place they are also flexing back, not scooping.

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Buccaneer
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Buccaneer » Tue May 22, 2018 10:58 am

SquierKA39 wrote:The impeller is more of a squishing than a scooping. Look at how the newer OMC rubber ones work. When in place they are also flexing back, not scooping.


I would imagine someone found many moons ago,that the rubber impeller with contact on
all sides was more efficient than a steel impeller, with much less contact .
I don't remember learning this fact, but what brand came out with the
rubber impeller first?

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PM T2
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby PM T2 » Tue May 22, 2018 11:01 am

might have been Mercury, they were using them pre-war.

Not sure when the wobbler type of water pump went into use. I'm not too well schooled on that sort of thing.

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wbeaton
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby wbeaton » Tue May 22, 2018 2:30 pm

Good question. Johnson TD/TN series and Martin both use wobble pumps in the 1940’s.

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Garry in Tampa
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Garry in Tampa » Tue May 22, 2018 11:06 pm

See number 39 - - - 8-)
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Buccaneer
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Buccaneer » Wed May 23, 2018 8:29 am

Garry in Tampa wrote:See number 39 - - - 8-)


Thanks again to the Outboard National Archives, and chair head, Garry Spencer!
1938 it is!
I'm guessing first came the "wobbler" style rubber pump,
gotta wonder when the first, "modern style" rubber vaned
impeller came about. :)

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Garry in Tampa
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Re: 1930 Elto Senior Speedster Water Pump Impeller

Postby Garry in Tampa » Wed May 23, 2018 10:42 pm

The first Evinrudes with a rubber veined impeller were these 1948 models . . .
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