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post #1 of 8 Old 04-28-2015, 09:57 PM Thread Starter
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Lil help

Ok so i have a new motor for my project...i need a new double pulley for the shaft..The old shaft is 3/4 and new motor is 1'. The dimensions of the new motor are 1' shaft, 2-3/4 long, 1/4 keyway. Anyone know or have a rough idea of what kind of pulley i need? Just a 1' double pulley or are there more variables? Thanks.
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post #2 of 8 Old 04-28-2015, 10:14 PM
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The new one has to have the same outside diameter as the old one. That's the important thing.
Also the belt grooves have to be the same width.


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post #3 of 8 Old 04-28-2015, 11:57 PM
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Quote:
Originally Posted by SNOWJOB1125 View Post
Ok so i have a new motor for my project...i need a new double pulley for the shaft..The old shaft is 3/4 and new motor is 1'. The dimensions of the new motor are 1' shaft, 2-3/4 long, 1/4 keyway. Anyone know or have a rough idea of what kind of pulley i need? Just a 1' double pulley or are there more variables? Thanks.
The distance between the V groves has to be exactly the same and when the motor is install, they have to be properly aligned with the transmission and auger pulleys.
For the transmission belt I would use a pulley with the exact outside diameter as the one from the old engine (so that the ground speed will remain the same).
For the auger belt I would do some calculations to get a impeller tip speed of 4000 - 4500 ft/min. (IMHO at this speed you will have the best performance of the impeller).

I found this at another forum:

Tip velocity is calculated:
impeller diameter inches / 12 = impeller dia ft X 3.14 = impeller circumference ft X impeller rpm = tip velocity ft/min.

If you are calculating the other way for needed rpm for a desired velocity with a known impeller diameter then first find the circumference of the impeller in feet:

diameter inch/12 = diameter ft (d below)
pi x d = circumference in feet
velocity/circumference = rpm

Say you have a 20" dia impeller you want to run at 4200ft/min

20"/12 = 1.67' x 3.14 = 5.24' circumference, then:
4200/5.24 = 801.5 rpm needed

Some may now see that their 20" impeller (a fairly common size impeller) straight driven from a 540 pto will be running at 2824ft/min tip velocity...somewhat shy of what others recommend (4000 - 5000ft/min) to throw snow REALLY far.


BTW Willl, the post you quote is sometime back in the development of this project. I have since discovered I have a 14" impeller not the 12". I'm now looking at a 2:1 540 rpm pto increaser to get impeller to 1080 rpm to get 3956ft/min.

14/12 = 1.167 x 3.14 = 3.66 x 1080 = 3956ft/min


When you find the desired rpm then you can do the calculation for the needed diameter of the outer engine pulley (for the auger belt).

I hope it makes sense.

By the way there is a Toro Powershif 28" with this engine upgrade on CL, it may be helpful to contact him for any tips if needed.

Toro snow thrower 16 HORSEPOWER
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post #4 of 8 Old 04-29-2015, 04:51 AM
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You don't need a double pulley. You can use 2 single pulleys often, plus it gives you a bit more flexibility.

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post #5 of 8 Old 04-29-2015, 06:51 AM
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Originally Posted by Shryp View Post
You don't need a double pulley. You can use 2 single pulleys often, plus it gives you a bit more flexibility.
+1 on that.
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post #6 of 8 Old 04-29-2015, 11:22 AM
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What specifically is the make and model of your "project" ?

If you're replacing the engine with a similar horsepower it's best to stick with a same size (diameter) pulley but if you're going bigger than you can use some of that extra power to put a slightly bigger pulley on.

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post #7 of 8 Old 04-29-2015, 11:40 AM
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I am thinking that his project is the NOMA 12hp33" from the previous thread ("Ok so step one is complete...i managed to score a pretty decent shape NOMA 33' 12hp").
4 extra HP, therefore my suggestion on a possibly larger impeller belt pulley based on impeller tip speed calculation results (for engine shaft).
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post #8 of 8 Old 04-29-2015, 06:50 PM Thread Starter
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Yes thats the snowblower im putting it on...im gonna start ripping it apart this friday...i never even thought to use 2 pulleys...awesome..dont know why i didnt think of it...i texted that guy with the toro and he lucked out and had a 1' pulley stock on his..so he used the original
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