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| Need belt sizing help on my Dynamark pulley swap. | |
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CraftsMAN Member
Age : 38 Join date : 2010-06-01 Points : 5780 Posts : 364 Location : NY
| Subject: Need belt sizing help on my Dynamark pulley swap. November 7th 2011, 10:57 pm | |
| Well as you can see from my youtube videos I took the rearend out of my Dynamark and packed it full of grease and oil then replaced the 7-1/2 pulley with a 3-1/2 pulley. The motor is an 11hp briggs motor. The stock belt was 87-1/2 inches so I picked up a 83 inch belt and that was still to big. I am going to try an 81? Does anyone know how much faster I will be going? | |
| | | CraftsMAN Member
Age : 38 Join date : 2010-06-01 Points : 5780 Posts : 364 Location : NY
| | | | ferg Member
Join date : 2011-10-24 Points : 4813 Posts : 45 Location : Cheshire, England
| | | | Guest Guest
| Subject: Dynamark pulley swap need belt help November 8th 2011, 3:48 pm | |
| to find out what size belt on a pulley swap, find the differance in circumferance of the new and old pulley (dx3.14) , divide that by 2, and add or subtract depending if you are going bigger or smaller. the new belt should be about 6.28" shorter or 81.22" round that down to 81 and you should be good.
Ditto on the 2X speed increase |
| | | CraftsMAN Member
Age : 38 Join date : 2010-06-01 Points : 5780 Posts : 364 Location : NY
| Subject: Re: Need belt sizing help on my Dynamark pulley swap. November 8th 2011, 11:14 pm | |
| Yea! but bad problem... lol went and got an 83 inch belt then they did not have an 81 at Tractor Supply CO in stock so I picked up an 80.. lol that did not work. So I need to find an 81.. | |
| | | dangeroustoys56 Veteran Member
Age : 54 Join date : 2010-02-10 Points : 7069 Posts : 1726 Location : Florida, USA
| | | | Guest Guest
| Subject: Dynamark pulley swap need belt help November 9th 2011, 7:57 am | |
| Dont think the belt number ( B81) is the size, usually the size and the belt number are a few inches off. a B81 belt is actually 83"
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| | | CraftsMAN Member
Age : 38 Join date : 2010-06-01 Points : 5780 Posts : 364 Location : NY
| | | | CraftsMAN Member
Age : 38 Join date : 2010-06-01 Points : 5780 Posts : 364 Location : NY
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| | | | | Need belt sizing help on my Dynamark pulley swap. | |
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