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 HELP!!!! PULLEY SWAP

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1997 Murray
samwillis211
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samwillis211
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PostSubject: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeSun Feb 22, 2015 8:48 pm

i want to swap the pulleys on my 11hp craftsman to go at least 25mph it has two forward speeds and reverse what size pulleys should i use to accomplish my goal
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1997 Murray
Hammer
Hammer
1997 Murray

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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeMon Feb 23, 2015 10:28 am

try a 4" rear and a 5" front
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Craftsman1998
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Craftsman1998

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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeMon Feb 23, 2015 11:00 am

a 1 to 1 ratio should do so a 5 in pulley to a 5in
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LAWN MOWER MUDDER
Vice Grip
Vice Grip
LAWN MOWER MUDDER

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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeMon Feb 23, 2015 9:59 pm

I run a 4.5" on the motor to a 3" on the transaxle. With 19-20" tires and without the governor she cruises right around 25. Now when I am cranking the high rpms from my motor I could pass out my dad on his side-x-side who was doing 25.

Your gear ratio can depend on a lot of little stuff too. Like for example ,the bigger tires you run, the faster it'll go. Also if you take the governor off your engine it may speed up a little bit.

The bigger the pulley on the motor the faster it'll go, just remember that. lol
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willysjeepmb
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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeWed Feb 25, 2015 1:09 am

Right now I run dead on 20mph. I don't know what my front pulley is, but its the factory one with the trans and deck drive. I run a 3" on the rear with a 6 speed and 20" tractor supply atv tires. Also, stock clutch with stock spring plus 3 trampoline springs. With my setup I use a 86" belt.

A little advice. Don't use cast aluminum 3" pulley on the rear. The shaft part got wore out in a week, because of the belt tension. It is so loose, at a idle it sounds like a rod knocking. If you use cast aluminum pulley on the rear, go no smaller than 4", I used one for 5 months before I wanted to go faster.
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Doc Sprocket
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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeWed Feb 25, 2015 7:15 pm

Not to bring the hate or anything, but from an engineering perspective, I would not suggest a 3" rear pulley and gobs of spring tension. 3" is really too small to get an effective amount of grip under a large load without artificial enhancement, such as your trampoline springs. So what the problem is?

All that tension is creating one hell of a radial load on the engine's crankshaft bearings and the tranny input shaft bearings. Much better to use larger pullies and save the added stress.

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willysjeepmb
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PostSubject: Re: HELP!!!! PULLEY SWAP   HELP!!!! PULLEY SWAP Icon_minitimeWed Feb 25, 2015 8:10 pm

@Doc Sprocket wrote:
Not to bring the hate or anything, but from an engineering perspective, I would not suggest a 3" rear pulley and gobs of spring tension. 3" is really too small to get an effective amount of grip under a large load without artificial enhancement, such as your trampoline springs. So what the problem is?

All that tension is creating one hell of a radial load on the engine's crankshaft bearings and the tranny input shaft bearings. Much better to use larger pullies and save the added stress.

When I find a good way to build a clutch for a bigger pulley setup I'm going to shoot for a 6" to 5".
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