Belt length change - Page 4 - Snowblower Forum : Snow Blower Forums
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post #31 of 35 Old 04-21-2018, 08:16 AM Thread Starter
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Originally Posted by Shaw351 View Post
Thanks for your research into that pulley. I think the Ariens impeller shaft has a flat machined into the pulley end for a drive boss that is then bolted to the pulley. I will take it apart today and see exactly how it is constructed.

Thanks for your help.

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post #32 of 35 Old 04-21-2018, 11:02 AM
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Hey Town....

Thinking about your project, how about taking a 1-inch diameter round stock Drilling and tapping the center to the same thread pitch as the crankshaft threaded hole. Then make an extension adapter to the length you need , assemble it with red Loctite on the threads. Then when you have it tightened as much as you can you will carefully take a cutting wheel and make a slot for a full-length key to go between crankshaft and new adapter and pulley.
I think this should work without any issues and make your project easier.
You could also take a 1-inch diameter round stock and drill a hole through the center, then have a keyway cut onto it, and then have a long Bolt through this new piece and bolt into your crankshaft. This would make it longer and be able to allow the pulley to slide on it. But machining would have to be perfect as it will be turning 3600 rpms. Just another idea to make the crankshaft longer.

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post #33 of 35 Old 04-21-2018, 06:03 PM Thread Starter
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Quote:
Originally Posted by Shaw351 View Post
Hey Town....

Thinking about your project, how about taking a 1-inch diameter round stock Drilling and tapping the center to the same thread pitch as the crankshaft threaded hole. Then make an extension adapter to the length you need , assemble it with red Loctite on the threads. Then when you have it tightened as much as you can you will carefully take a cutting wheel and make a slot for a full-length key to go between crankshaft and new adapter and pulley.
I think this should work without any issues and make your project easier.
You could also take a 1-inch diameter round stock and drill a hole through the center, then have a keyway cut onto it, and then have a long Bolt through this new piece and bolt into your crankshaft. This would make it longer and be able to allow the pulley to slide on it. But machining would have to be perfect as it will be turning 3600 rpms. Just another idea to make the crankshaft longer.
Thanks Shaw351 for that ingenious approach. I will take a look at doing that.

I took my machine apart today and was surprised to find the driven pulley for the auger is actually 8.5" and not 9" as I previously measured while the machine was together. Using pulley outside diameter that should give an impeller speed of 1197 rpm, but I only measure 1100 or so. It appears that you really need to use the pulley ratio diameter for a half inch belt which sits about 1/8" below the pulley diameter. So when I reduce the two pulleys to 2.5" and 8.25" the impeller speed reduces to 1120 rpm which is about what I measured.

So now my focus is on your above proposed solution of extending crank shaft length and attaching the 3.05" engine pulley to give a corrected impeller speed of 1255 rpm. I can probably use the stock belt with some adjustment to the idler pulley location.

Thanks very much for your ideas.

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post #34 of 35 Old 04-22-2018, 05:43 PM Thread Starter
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Here are some pics of the Platinum impeller driven pulley assembly:







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Name:	Ariens Impeller driven pulley 8.5 dia.jpg
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Name:	Ariens Impeller shaft & drive boss.jpg
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post #35 of 35 Old 09-04-2019, 06:25 PM Thread Starter
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Just an update on fitting a dual belt pulley to my SHO. I bought a 2AK32x1 pulley and had a machine shop lengthen it to fit the SHO. Installed it today and it runs well with stock belts. Engine rpm is 3,925 and with the 3.25 engine pulley drives the impeller at 1,447 rpm. No vibration either.

Post #50 in this thread gives some pics: https://www.snowblowerforum.com/foru...des-fan-5.html

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