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josjay


Joined: Feb 22, 2011
Points: 19

what size pulleys
Original Message   Feb 23, 2011 4:18 pm
what size pulley should iput on 305cc engine there is a 51/2'' pulley on blower .it is a 36' cut blower for a lawn mower but i am modifying to go on atv .its a single stage so i want to get most power i can out of it.any help would be appreciated thanks..
Replies: 32 - 41 of 41Next page of topicsPreviousAllView as Outline
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: what size pulleys
Reply #32   Mar 13, 2011 4:15 pm
A two stage would work. But you'd have the same sort of problem.  A 10hp engine would not be big enough to run a 36" 2 stage blower.
Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: what size pulleys
Reply #33   Mar 13, 2011 8:53 pm
ralphfr wrote:
As a single stage blower owner and being extremely jealous of all of you knowledgeable 2 stage owners I read all of these threads with great interest. I was thinking about the issue of impeller and auger housing clearance and thought about the possibility of using something like a roll-on truck bed liner like dupli-color bed armor or something similar. Enough coats would probably help with the auger clearance while protecting the housing at the same time. Good idea or bad?


Is your auger adjustable? Some large single stage blowers have a means of adjusting the auger clearance. Check your manual if you can't tell by looking, or even the parts manual. It makes a HUGE difference.

Who the hell let all the morning people run things?
ralphfr


Location: Long Island, NY
Joined: Jan 22, 2011
Points: 40

Re: what size pulleys
Reply #34   Mar 15, 2011 6:23 pm
JRTREBOR - Makes sense. I had a feeling the texture might be an issue. Initially I thought this was just an impeller issue until I read a post earlier in this thread alluding to auger clearance as an issue. Thanks.

BILL_H - Not an issue for my Toro SS as the housing is plastic and the auger is rubber and wears with use but thanks for the suggestion.
This message was modified Mar 15, 2011 by ralphfr
josjay


Joined: Feb 22, 2011
Points: 19

Re: what size pulleys
Reply #35   Mar 16, 2011 7:26 am
checked my rpm on engine today it is at 3640 rpm.would it be safe to turn it up,iread on here someone had turned up to 4500 with no problem.
borat


Joined: Nov 10, 2007
Points: 2692

Re: what size pulleys
Reply #36   Mar 16, 2011 11:31 am
Most OPE four stroke engines are designed to run at 3600 rpm.  You could spin it at 4500 but who knows what effects it will have?   I have no reservations spinning up two cycle engines.  Not sure I'd want to be spinning an OPE four stroke engine too high.   Go-cart racers do it all the time but they also rebuild their engines every so often. 
aa335


Joined: Nov 29, 2008
Points: 2434

Re: what size pulleys
Reply #37   Mar 16, 2011 11:57 am
I had 4 stroke Honda 160cc engine running above 4000 RPM and it didn't feel right.  The noise was quite loud with the existing muffler.  The vibration was unbearable without some kind of isolation engine mounts from the chassis.
jrtrebor


Location: Michigan - 3 hours north of Chicago on the lake
Joined: Feb 10, 2010
Points: 539

Re: what size pulleys
Reply #38   Mar 16, 2011 7:01 pm
Increasing the RPM isn't really going to accomplish much.  On OPE engines an increase in RPM at the high end won't do anything to increase the torque. It fact it will probably drop, the higher you rev the
engine.  So the auger may spin faster, until you put a snow load on them. There is no short cut to take if your you don't have enough HP to run a blower.  And that is the problem you have. 
A 10HP engine simply isn't large enough to power a 36" blower. 

If there was a way around that problem with gearing someone would already be doing it.  Blower augers (single stage) and blower impellers
(2 stage)  need the right mixture of power and RPM to operate well.
borat


Joined: Nov 10, 2007
Points: 2692

Re: what size pulleys
Reply #39   Mar 16, 2011 8:15 pm
There is no replacement for displacement when it comes to torque.
Bill_H


Location: Maine
Joined: Jan 12, 2008
Points: 354

Re: what size pulleys
Reply #40   Mar 16, 2011 8:36 pm
borat wrote:
There is no replacement for displacement when it comes to torque.


Reminds me of an old hot rodder's saying "There's no substitute for cubic horsepower" :)

Who the hell let all the morning people run things?
josjay


Joined: Feb 22, 2011
Points: 19

Re: what size pulleys
Reply #41   Mar 17, 2011 7:45 pm
ok good to know for sure  tks for all the info you guys were a great help.
Replies: 32 - 41 of 41Next page of topicsPreviousAllView as Outline
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