Any Ideas on Posts 10 & 12?
Are you holding the cylinder horizontal or vertical?
Are you holding the cylinder horizontal or vertical?
It's simple, the old farts that use old saws got to have something to crow about, and if the old saw aint as fast as the new saws, they boy ya better bet they got more torque. Snow was always deeper back in the day too, five miles to school uphill bothways into a head wind...
HP = (torque x RPM) / 5252
So to produce the same HP a saw turning 6,000 RPM is going to need to produce twice the torque of a saw turning 12,000 RPM.
my 'not' meant, the dwell time is related to rpm only. one rev in the same time, regardless of geometry. There is difference in piston accelerations and motions due to stroke, and the rod to crank angle is affected near the top of the stroke, but the torque is the sum of many factors. Ultimately, the expansion of hot gasses through the stroke of the piston is what defines the power and torque, and that is determined by those many factors. mixture, burn rate, type of fuel, ignition timing, swirl of the charge in the cylinder, combustion chamber shape, heat losses to piston and chamber, cam timing/port timing, compression ratio in cylinder and in crankcase, transfer port angles, shapes, etc etc.
k
uh oh..... Deja vue...
A couple of years ago there was a long and heated thread debating whether a heavier flywheel "increases" torque.... I'm with the "Not so" crowd....
OK. Thanks for helping me get this cleared up. I knew it had something to do with Torque, but was not sure exactly what. Bruce.Bruce, you are describing "torque rise", a characteristic of engines that normally operate beyond their torque peak.
my 'not' meant, the dwell time is related to rpm only. one rev in the same time, regardless of geometry. There is difference in piston accelerations and motions due to stroke, and the rod to crank angle is affected near the top of the stroke, but the torque is the sum of many factors.
k
Getting boring now. Possibly should be lumped in with oil threads.
Gary?
Bruce, you are describing "torque rise", a charachteristic of engines that normally operate beyond their torque peak.
I guess we're giving up torque for chain speed these days, but what's the difference in the engine configuration. I assume that it has much to do with the porting, but I'd like to hear more.
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