Xref: 127.0.0.1 aus.gardens:23742


"Han Chung" wrote in message
om...
len gardener wrote in message
. ..

Hi Len - I just had a question about torque.

it will come down to the torque that one or the other engine may
develop at a certain rev' range, put simply the more torque for less
revs will be the ideal. on your size lawn you may not notice a whole
lot of difference but then if money is no option go for the bigger
horsepower.

The two engines I'm looking at a

http://www.honda-engines.com/gcv160.htm
http://www.honda-engines.com/gcv190.htm

The GCV160 has 7.6 lbf ft of maximum torque at 2500 rpm. The GCV190
has 8.1 lbf ft of torque at the same rpm. What does this all mean?

If you can picture a car with one person driving along, then it comes to a
hill. As it heads up that hill it will slow down if you keep the accelerator
in the same spot. To keep up speed you need to feed on more accelerator.
Now same scenario, but the car is fully loaded, luggage and 5 people. The
car will struggle a lot more up hill, needing a lot more throttle to keep up
speed.
THis is due to Torque, and a car with more torque will struggle less.
WIth a mower you may hit long grass and the revs die down. A higher torque
engine will not die down as much. Engine capacity and or crank/flywheel
weight can make the torque difference.
Really for a house lawn that is kept tidy then for the average mower it
wouldn't make much difference.
And as for the revs at 2500rpm that is where the peak torque (figures given)
are reached. This is usually (or always I think) less revs than the engines
full revs, and unless you have a tachometer attached to the mower you won't
know the revs.
i.e. The mower mentioned is at 2000rpm and you hit long grass, the revs die.
Bringing the revs up to 2500rpm and it will cut at it's peak torque. If the
grass is that long that revs can't hit 2500rpm, then that would be where a
higher torque engine would be needed.
Anways, that's all as a general rule.
good luck
Cheers,

Han.