[Spawn.Qc]

This is very interesting discussion and I love it.

So is it me or we can say that some aspect of impeller speed play for us, other against us? As for the gap, it reduce efficiency while not really helping much... so this brings a question.
Why aren’t they any tighter? It’s really not crazy precise manufacturing involved right?

Also, high impeller rpm doesn’t not necessarily equal high speed for snow, speed is also determined by the radius of the impeller which is slightly increased by impeller mods...

Oh, torque converter do create heat as fluid is moved and pressurized by the vanes.. the only difference is that the friction happen between oil particles instead of clutch surface material...

Thx
Stephan


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[Shovel]

This is very interesting discussion and I love it.

So is it me or we can say that some aspect of impeller speed play for us, other against us? As for the gap, it reduce efficiency while not really helping much... so this brings a question.
Why aren’t they any tighter? It’s really not crazy precise manufacturing involved right?

Also, high impeller rpm doesn’t not necessarily equal high speed for snow, speed is also determined by the radius of the impeller which is slightly increased by impeller mods...

Oh, torque converter do create heat as fluid is moved and pressurized by the vanes.. the only difference is that the friction happen between oil particles instead of clutch surface material...

Thx
Stephan


Envoyé de mon iPhone en utilisant Tapatalk

More impeller speed if you have power to spare.. if not then it will actually be counter productive (as long as you are not over working the impeller itself.
Then impeller mod on some of the machines makes a significant difference in getting the snow out... On the Honda's.. there isn't as much benefit and a person may not have the need to try.. The MTD based models have huge gaps and seem to gain alot from the mod.
I didn't even try mine(MTD based) out without the mod.. It got the mod before it saw the snow..as I know we get slushy conditions here.
As far as why some of the cheaper machines have large gaps?
Will still work if the impeller housing is egg shaped.
Less apt to freeze in place at the bottom.
Save a little money on production costs.
They just don't care ..and expect most people won't anything about the gap anyway..Just my guess


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[Tony P.]

So is it me or we can say that some aspect of impeller speed play for us, other against us? As for the gap, it reduce efficiency while not really helping much... so this brings a question.
Why aren’t they any tighter? It’s really not crazy precise manufacturing involved right?

Sheet metal is an inexpensive and fairly easy material to work with provided some variability is allowable. Snow blower impeller housings are built to varying tolerances in part because getting sheet metal to precise specs and perfect roundness is difficult and building a machine that maintains that shape complicates things further. Impellers have small but significant lateral play during installation which compounds the variability in the housing. The placement of carriage bolt heads in the housing of some models makes some gap necessary.

The frustrating thing in all this to me is that adding rubber paddles is a fairly inexpensive fix.

 

[Spawn.Qc]

More impeller speed if you have power to spare.. if not then it will actually be counter productive (as long as you are not over working the impeller itself.
Then impeller mod on some of the machines makes a significant difference in getting the snow out... On the Honda's.. there isn't as much benefit and a person may not have the need to try.. The MTD based models have huge gaps and seem to gain alot from the mod.
I didn't even try mine(MTD based) out without the mod.. It got the mod before it saw the snow..as I know we get slushy conditions here.
As far as why some of the cheaper machines have large gaps?
Will still work if the impeller housing is egg shaped.
Less apt to freeze in place at the bottom.
Save a little money on production costs.
They just don't care ..and expect most people won't anything about the gap anyway..Just my guess


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Valid point!


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[tabora]

As someone much smarter than me (@drmerdp, see thread https://www.snowblowerforum.com/for...nda-snowblowers/148607-why-dont-other-brands-require-rejetting.html#post1660267) postulated, it's all about what happens at the boundary layer between the high velocity snow and the low velocity snow close to the wall of the impeller chamber.

If you've ever worked with aerodynamic shapes in a wind tunnel, you know what happens when boundary layers interact... This wind tunnel video graphically shows the boundary layer (in this case air) slowing down, which causes friction and disrupts the airflow, messing with what you're trying to accomplish in the wind tunnel. Their solution was to add high-velocity air flow below the boundary layer to re-accelerate the boundary layer; in snowblowers we are adding the "impeller kit" wipers that accelerate the boundary layer snow and eliminate the low-velocity snow from the chute flow, reducing and usually eliminating the tendency to stick and clog in the chute.

I am about to install one of @drmerdp's stainless steel & 3-ply belt impeller kits, and am confident that my currently near-perfect, non-clogging HSS1332 performance will only improve. While I have the chute off, I'm also planning to cut a few extra teeth on either side of the chute base to increase the rotation as @ThumperACC did: https://www.snowblowerforum.com/forum/honda-snowblowers/137913-hss928-chute-rotation-mod.html

 

[squid3083]

In my mod, a small gap that varies was left to have little to no friction with the housing, and it is throwing like a beast.

I don't recall having a snow thrower shoot far away and high like that.

When I feel like working on it at -10c I will finish adding a small pad on the inside left of the impeller, should help a bit more lol.