Diameter of the SHO Sheave 2 Grooves Pulley - Snowblower Forum : Snow Blower Forums
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post #1 of 12 Old 03-21-2020, 08:18 PM Thread Starter
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Diameter of the SHO Sheave 2 Grooves Pulley

Is it really 2.75" diameter? Is anyone on here with that pulley can confirm?
The one that I have is 2.5". The Internet seemed to mix it up a lot. They would say that it is the SHO sheave and 2.75" diameter, but when I counted the pixels, it was only 2.5".

Last edited by dman2; 03-21-2020 at 08:25 PM.
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post #2 of 12 Old 03-21-2020, 08:55 PM
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Yep, just measured my D28SHO and the drive pulley is 2.75".

Ariens Deluxe 28 SHO

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post #3 of 12 Old 03-21-2020, 09:07 PM Thread Starter
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Originally Posted by Cold1 View Post
Yep, just measured my D28SHO and the drive pulley is 2.75".
Thank you so much for that. You got your hand dirty to measure it for me.
Knowing its true diameter, I'm now confident to order it.

Thank you, again. You are awesome.
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post #4 of 12 Old 03-21-2020, 09:14 PM Thread Starter
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For the next person, I want to say that the SHO pulley has the words SHO and PRO stamped on it. The other one has the same ID number, but only 2.5" diameter. They like to mix them up.
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post #5 of 12 Old 03-21-2020, 09:19 PM
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Quote:
Originally Posted by dman2 View Post
Thank you so much for that. You got your hand dirty to measure it for me.
Knowing its true diameter, I'm now confident to order it.

Thank you, again. You are awesome.
No problem, only took a couple of minutes.

Ariens Deluxe 28 SHO

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post #6 of 12 Old 03-23-2020, 02:54 PM
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Unless you have a tight belt length tolerance, I don't think that little difference will matter much. There probably is enough play in the belt adjustment, to take care of that.
Sid

'66 Sears/Murray 26"
'71 Jakobson 17 SnowBlitz
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post #7 of 12 Old 03-23-2020, 09:43 PM Thread Starter
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With a large impeller, that little pulley different does make a different. It is like the impeller mod, but better. It is how the Deluxe SHO and Pro got the higher output. They throw farther, too. I can see the different.

Where I live, the most we would get is 12", so engine size is not going to be a problem for me. Plus, the flat head Tecumseh has more displacement. They seem to maintain rpm better than the newer ones.

Some Hondas have less hp and torque, but faster impeller speed. I'm not too crazy for throwing distance, but I would like to see more out of my snowblower.

My only concern is the belt length. Hopefully, I will not need new belts. I will do some research beforehand.

Last edited by dman2; 03-23-2020 at 09:57 PM.
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post #8 of 12 Old 03-24-2020, 06:47 AM Thread Starter
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It is very likely that I will need new belts for that.

My belts were 39.5" in length. Last time I checked, they had a tight tolerance. So, finding an extra 0.5" out of them is going to be hard.

The SHO models uses 41.5" belts, but I think their crankshafts sit higher.
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post #9 of 12 Old Yesterday, 05:32 PM Thread Starter
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I have the new SHO sheave pulley with me right here.

It turned out that my snowblower was already equipped with the SHO sheave pulley 2.75", just like I first thought.
It is a ST824E, or Deluxe 24 (one of the first models in the 921 series), so it had that 2.75" pulley vs. the 2.5" pulley on the newer deluxe models.
The auger pulley is the same 8.5"

It should have 1080-1100 impeller rpm at 3500 engine rpm.

Some members on here confused me with their numbers, so that messed up my calculations and measurements.
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post #10 of 12 Old Today, 11:12 AM
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Quote:
Originally Posted by dman2 View Post
I have the new SHO sheave pulley with me right here.

It turned out that my snowblower was already equipped with the SHO sheave pulley 2.75", just like I first thought.
It is a ST824E, or Deluxe 24 (one of the first models in the 921 series), so it had that 2.75" pulley vs. the 2.5" pulley on the newer deluxe models.
The auger pulley is the same 8.5"

It should have 1080-1100 impeller rpm at 3500 engine rpm.

Some members on here confused me with their numbers, so that messed up my calculations and measurements.
My machine when new had engine rpm of 3,450 and turned the impeller at 1,040 rpm. I moved the governor spring to the outer hole on the governor arm which increased engine rpm to 3,700 and impeller speed to 1,110 rpm.

The Ariens spec for 1083 rpm for the impeller requires engine rpm of 3,600.

The Pro models turn the impeller at the same speed as the Platinum due to the same engine speed (3,600 rpm), engine pulley diameter (2.75"), impeller pulley diameter (8.5"), and impeller diameter (14"). It is not clear where Ariens get their 1,112 impeller rpm from unless the engine rpm is 3,700 rpm. Owners who have checked the engine rpm seem to confirm 3,600 rpm though.

Engine rpm will vary a little from "stock" 3,600 rpm due to the fixed end of the governor spring being a bent engine cooling cover. Seems a lot of users are reporting 3,500 approx for the stock engine. Stock is 3,600 rpm with plus or minus 100 rpm, so stock engine can run 3,500 to 3,700 rpm and be technically within spec.

2015 Ariens Platinum 30 SHO - model 921040
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