Plastic impellers... - Snowblower Forum : Snow Blower Forums
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post #1 of 124 Old 01-28-2018, 09:25 AM Thread Starter
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Plastic impellers...

And I thought the stamped sheet metal auger sections were bad enough, and just when you thought things couldn't get any worse, this happens.

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post #2 of 124 Old 01-28-2018, 09:39 AM
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What's wrong with a plastic impeller?
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post #3 of 124 Old 01-28-2018, 09:46 AM
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If you try to throw a chunk of ice at -20 degrees, you will see plastic coming out of your chute. Just my guess though.
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post #4 of 124 Old 01-28-2018, 09:54 AM
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Plastic composites have come a long way, from aerospace to auto manufacturing, manufacturers choose plastic over metal due to space/weight/shape constraints and prefer it over metal.

In this case however the choice was made to cut cost, so no bueno.

Beside being brittle than metal I wouldnt want a plastic impeller just because of the lack of momentum/torque compared to a metal one.
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post #5 of 124 Old 01-28-2018, 09:55 AM
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Quote:
Originally Posted by RIT333 View Post
If you try to throw a chunk of ice at -20 degrees, you will see plastic coming out of your chute. Just my guess though.
Has this ever happened? Is it a wide spread problem? What kind of plastic is it? Is there an epidemic of exploding impellers? Has it ever happened even once?
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post #6 of 124 Old 01-28-2018, 09:57 AM
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A good % of the machines that I work-on have at least 1 impeller vane that nailed something... hard enough to distort.

I would be interested to see the outcome of a plastic impeller encountering whatever bent this vane from an old-school Toro.


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post #7 of 124 Old 01-28-2018, 10:00 AM
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Originally Posted by JnC View Post
Plastic composites have come a long way, from aerospace to auto manufacturing, manufacturers choose plastic over metal due to space/weight/shape constraints and prefer it over metal.

In this case however the choice was made to cut cost, so no bueno.

Beside being brittle than metal I wouldnt want a plastic impeller just because of the lack of momentum/torque compared to a metal one.
Actually, plastics can be, and in this case I bet it is, more expensive to manufacture than metal.

And to your point, plastics can be shaped to be more effective than their metal counterparts.
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post #8 of 124 Old 01-28-2018, 10:02 AM
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A good % of the machines that I work-on have at least 1 impeller vane that nailed something... hard enough to distort.

I would be interested to see the outcome of a plastic impeller encountering whatever bent this vane from an old-school Toro.
Depends on what the plastic is. There's lots of different kinds of plastic. What tends to kill plastics is SUN, UV RAYS. that's plastics mortal enemy. Makes them brittle.
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post #9 of 124 Old 01-28-2018, 10:12 AM
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Depends on what the plastic is. There's lots of different kinds of plastic. What tends to kill plastics is SUN, UV RAYS. that's plastics mortal enemy. Makes them brittle.
The metal on those vanes requires a forge to reshape. Mapp and a sledge hammer wouldn't even nudge it.

On the otherhand, perhaps if my '89 toro 824 had a plastic impeller to vaporize, I wouldn't have had reweld the entire auger housing to correct the torsional twist.

before


during


correction:


after


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post #10 of 124 Old 01-28-2018, 10:20 AM
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I have No Problem with Plastic For Certain Applications, But I Don't Want it on My Snowblower. Period.
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