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skyking3


Joined: Nov 14, 2002
Points: 217

changing pully sizes ?
Original Message   Jan 14, 2005 6:57 pm
hi everyone,

got a question concerning pully sizing..........over on the IH CC forum theres a person that changed a tractor mounted single stage thrower pully from 3.5 inches to 2.5 inches and shows pics of the enormous difference in distances..............is this an  accepted method of improving snowthrowers in your opinion?................i was thinking ,after seeing this ,about trying this idea out on my JD tractor mounted thrower but would be concerned about damage that could happen................

any ideas or opinions ?

thanks,

bill

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jubol


Location: Dover, De
Joined: Oct 3, 2003
Points: 1558

Re: changing pully sizes ?
Reply #6   Jan 15, 2005 7:39 am
SkyKing,

          If you had a 2 stage, I had an Impeller mod that would help a great deal.

On the pulleys, I might go from a 3.5 to a 3, should help a lot.

On a blower, working in the cold temps, I do not think heat on the bearings would be a problem.

                                    Fred           

Husqvarna STE927(11.5HP) snowblower,  MTD Pro Series 18/42 Lawnmower, MTD 6.5 HP  Self Prop Lawn Mower,  Weedeater 1500 Blower, Web Gensis  2000 
skyking3


Joined: Nov 14, 2002
Points: 217

Re: changing pully sizes ?
Reply #7   Jan 15, 2005 7:42 am
thanks fred,

all my throwers are singles but i really should add a 2 stage sometime................

thanks again,bill

Dave___in___CT


Deliberate often...
...decide once...


Location: West-Central Connecticut
Joined: Sep 17, 2002
Points: 3159

Re: changing pully sizes ?
Reply #8   Jan 15, 2005 10:29 am
When we were kids...

...my cousin and I changed a pulley size and belt on our Uncle's  riding lawnmower to make it go faster...

WOW... did it !  

But... it blew up after 15 minutes...     


Taught us a lesson about messing with engineered products...

Taught my Uncle a lesson about letting his Nephews use his equipment...


Dave...

Whether you think you can or you can't... you're right.
Henry Ford

   BCS Tractor & snowblower

nibbler


Joined: Mar 5, 2004
Points: 751

Re: changing pully sizes ?
Reply #9   Jan 15, 2005 11:24 pm
I must be missing something here. If you are decreasing the size of the pulley on the engine aren't you slowing down the auger? If so then you have more power and can crunch through harder stuff but you're not going to throw it as far.

You can calculate the speed change by looking at the ratio of either the radii , diameters or circumference. Since most peole talk in terms of diameter  I'll use that.

I'm assuming we are taling about the pulley on the engine.

3" to 4" is 4/3 ~ 1.33 or about a 1/3 increase in the RPM of the auger It will throw snow farther and process snow faster but will get bogged down faster. Gas consumption might be higher as well.
Majorxlr8n


Location: Freehold NJ
Joined: Aug 6, 2003
Points: 1092

Re: changing pully sizes ?
Reply #10   Jan 16, 2005 1:30 am
I believe he would be decreasing the pulley size on the snowblower attachment, which would indeed speed it up.

Marty

robmints


Joined: May 13, 2003
Points: 4691

Re: changing pully sizes ?
Reply #11   Jan 16, 2005 10:51 am
Goldrush


The liberty of expressions sometimes are ridiculed!

Location: St-Hubert Qc. Canada
Joined: Jan 10, 2005
Points: 117

Re: changing pully sizes ?
Reply #12   Jan 16, 2005 6:28 pm
Don't ever change pulleys the machine is built like that the ratio would affect power of engine and causing damage too think of it

millwright


MIllwrights keep the world running

Location: Cape Breton Nova Scotia
Joined: Jan 14, 2003
Points: 188

Re: changing pully sizes ?
Reply #13   Jan 17, 2005 12:47 pm
Been changing pulley raitos all the time  with the single stage your auger has a reduction for the auger drum through the sprockets  formula is the same dia. or  # teeth on a sprocket  20 T  on driver  60T  on driven  raito  3:1 .But remember  increase in speed decrease in torque.

millwright.

skyking3


Joined: Nov 14, 2002
Points: 217

Re: changing pully sizes ?
Reply #14   Jan 18, 2005 7:47 am
sorry i couldn't get back before now..........................

i would be reducing the pully on the blower itself.......................

more speed would be good for powdery snow (if we ever get any )...........

no torque for the wet stuff is what i dont like...................

maybe i'll just keep it stock , it might work well enough like that.....................

thanks for the replies , they helped alot ,

bill

Replies: 6 - 14 of 14Next page of topicsPreviousAllView as Outline
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