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How to go faster?

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Scott Nelson

06-21-2003 19:24:37




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I have a craftsman 21hp riding mower that I would like to increase the wheel speed on but I'm having dificulties finding that info. I'm not looking to go 35mph but just increase the factory speed maybe 3-10 mph if it's possible without damaging the trans. I've have heard it might be as easy as reversing the engine pully with the tranny pully.
Any help would be apreciated.
Scott




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buickanddeere

06-22-2003 19:58:03




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 Re: How to go faster? in reply to Scott Nelson, 06-21-2003 19:24:37  
Better to increase the size of the driver pulley than reducing the size of the driven pulley. Less chance of slippage/bearing wear without having to over-tighten the belt.



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Scott

06-26-2003 16:24:52




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 Re: Re: How to go faster? in reply to buickanddeere, 06-22-2003 19:58:03  
Well I got it done, it wasn't as bad as I figured.
I droped the size of the tranny pully from a 9" to a 6" and changed the drive belt and I was off. It seemed to increase my speed about 3-5 mph which was all i was looking for.

Thanks everybody for the help. Scott



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Don LC

06-22-2003 15:55:02




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 Re: How to go faster? in reply to Scott Nelson, 06-21-2003 19:24:37  
Larger diameter wheels and tires will increase the speed in all the gears.....but would cut your power somewat...OK for driving around,but no good for cutting grass-----blade speed would stay the same.....try an inch smaller pully on the engine or the out put of the trans.....



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Scott Nelson

06-22-2003 19:10:52




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 Re: Re: How to go faster? in reply to Don LC, 06-22-2003 15:55:02  
We have a store out here called tractor supply that has all kinds of goodies that I will be going to tomorrow. Being it's a craftsman mower I'm not sure what to expect. I took the gearbox pully off today and it apears to be an 8" pully. I will try to find a smaller one.

Thanks
Scott



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Frank (n.mi.)

06-22-2003 05:37:41




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 Re: How to go faster? in reply to Scott Nelson, 06-21-2003 19:24:37  
I've got an old wheel hores that the previous owner upsized the wheels on. Don't know what he was looking to acheive but when you put in third gear now it really hauls!



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JOHN BOSSLER

06-21-2003 22:52:58




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 Re: How to go faster? in reply to Scott Nelson, 06-21-2003 19:24:37  
Scott,
Yes increasing you speed is easy, but you will decrease your power by doing so. If speed is increased too much the power loss will be noticable. You can increase the speed by replacing the driven pulley (the one on the transmission) with a smaller diameter pulley. Or by replacing the drive pulley (the one on the engine) with a larger diameter pulley. Remember by decreasing or increasing the size of a pulley or sprocket on any shaft changes the leverage on the shaft. it is like putting a pipe on a ratchet to loosen a bolt. The longer the pipe makes it easier to loosen the bolt. But if you were the bolt trying to hold the ratchet up, with a pipe on it, it would get harder to hold up, the longer the pipe was. Basicly the longer the pipe or diameter of the pulley changes the torgue on the shaft. this is why it will decrease your power if you increase your speed. hope this makes sense to you. John

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Scott Nelson

06-22-2003 00:32:53




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 Re: Re: How to go faster? in reply to JOHN BOSSLER, 06-21-2003 22:52:58  
Thanks Guys. My biggest complaint is in reverse gear, it is rediculous how slow it is. the primary reason for the change is when I plow snow. like I said I don't want a tremendous change just a little. Do you have any sugestions as to where I can purchase the required parts?


Thanks again
Scott



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Rod (NH)

06-21-2003 20:28:50




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 Re: How to go faster? in reply to Scott Nelson, 06-21-2003 19:24:37  
Hi Scott,

I'd be cautious about swapping the pulleys around. You might overdo it that way. The ratio of shaft speeds for pulley drives is the same as the inverse ratio of the pulley diameters. For instance, if the drive pulley is two inches in diameter and the driven pulley is six inches in diameter, the speed of the driven shaft is 1/3 that of the driving shaft. Simply swapping the pulleys in such an arrangement would make the driven shaft turn three times the driving shaft for a whopping 900% increase! (assuming you don't stall the motor in the process). I don't know the relative values involved but I would approach it by thinking about either a little larger drive pulley or a little smaller driven pulley. In either case, a different belt would be required.

Good luck, and if you damage anything don't call me or Sears :o).

third party image Rod

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