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Throttle speed make a difference?

khutch

LawnSite Senior Member
Location
Atlanta, GA.
Does throttle/engine speed make much of a difference in cut?
My Exmark 36 w/b seems to be cutting well at half-throttle, gears 3-4. Does this have a dramatic effect on blade speed and/or cut?
 

KenH

LawnSite Bronze Member
Location
CT
I would definately think so. Can your belts be slipping at the higher RPM's???
 

rodfather

LawnSite Fanatic
Location
Clinton, NJ
1/2 throttle??? Why only 1/2? Of course it has an effect on blade tip speed and cut...
 

GrassFearsMe

LawnSite Senior Member
Location
Long Island, NY
full power = better cut and better for the lawn. When you cut the engine speed drops under the strain and you end up tearing the grass and leave clumps on it. try it at full throttle you'll love it.
 

sawman65

LawnSite Senior Member
when you take an engine below it's no load rpm rateing and put the blades on and cut with it it will fall below its peek in the torque curve all the engine makers tell you to run it at full throttle
john
 

lawnagent

LawnSite Senior Member
Originally posted by ZaK18
If the mowing conditions are right run it at half throttle and pocket the money you saved in gas!
If the engine is air cooled it cannot fully disipate heat by running half throttle. That is why they are designed to run full throttle. If it cannot fully disipate the heat, then you are looking at shorter engine life. A typical case of "pay a little now or alot later".
 

mbricker

LawnSite Senior Member
Location
Tontitown, AR
Run wide open. EXCEPT:

When you get on a lawn with some kind of junky sticky grass that gums up under the deck and then blows out in clumps, try mowing with about 2/3's throttle. I've also noticed sometimes I can mow a wet lawn and leave it nicer at part throttle than wide open.

But some mowers have a slower blade tip speed than others--so part throttle might not make any didfference with your particular equipment.
 
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