Topic: 1930 Elto Senior Speedster Water Pump Impeller

This topic has 10 replies, 5 voices, and was last updated 5 years, 11 months ago by Buccaneer.

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May 21, 2018 at 11:10 pm #9997
Buccaneer
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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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May 22, 2018 at 5:16 am #76541
garry-in-michigan
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Lifetime Member
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 . . . 😎
– – – – 1941 Speeditwin – – – –
May 22, 2018 at 11:53 am #76551
Buccaneer
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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.

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May 22, 2018 at 1:11 pm #76559
squierka39
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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.
May 22, 2018 at 2:58 pm #76561
Buccaneer
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quote SquierKA39:

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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May 22, 2018 at 3:01 pm #76562
pm-t2
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Canada Member - 2 Years
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.

PM T2
May 22, 2018 at 6:30 pm #76573
wbeaton
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Canada Member - 2 Years
Good question. Johnson TD/TN series and Martin both use wobble pumps in the 1940’s.

Wayne
Upper Canada Chapter

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May 23, 2018 at 3:06 am #76594
garry-in-michigan
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See number 39 – – – 😎
May 23, 2018 at 12:29 pm #76603
Buccaneer
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quote Garry in Tampa:

See number 39 – – – 😎

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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May 24, 2018 at 2:42 am #76635
garry-in-michigan
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Lifetime Member
The first Evinrudes with a rubber veined impeller were these 1948 models . . .
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