What has more Torque???
- Thread starter johnk
- Start date
- Views: 2591
RalphVa
Super Member
- Joined
- Dec 19, 2003
- Messages
- 7,901
- Location
- Charlottesville, VA, USA
- Tractor
- JD 2025R, previously Gravely 5650 & JD 4010 & JD 1025R
Torque has nothing to do with the # of cylinders. Diesel will have a bunch more torque than gas, and a longer stroke engine will have more torque than a short stroke one.
Ralph
Ralph
RalphVa
Super Member
- Joined
- Dec 19, 2003
- Messages
- 7,901
- Location
- Charlottesville, VA, USA
- Tractor
- JD 2025R, previously Gravely 5650 & JD 4010 & JD 1025R
Torque has nothing to do with the # of cylinders. Diesel will have a bunch more torque than gas, and a longer stroke engine will have more torque than a short stroke one.
Ralph
Ralph
whodat90
Silver Member
The only thing that matters is what rpm you're measuring the torque at. If they both make 10HP@10RPM, they both have 5,250 ft/lbs of torque. If they have the same displacement, then the longer stroke of the 2cyl is offset by the larger number of power pulses per rotation of the three cylinder. It's really a question of torque curves rather than absolute torque, and that's something that can really only be determined by looking at dyno charts of both engines.
whodat90
Silver Member
The only thing that matters is what rpm you're measuring the torque at. If they both make 10HP@10RPM, they both have 5,250 ft/lbs of torque. If they have the same displacement, then the longer stroke of the 2cyl is offset by the larger number of power pulses per rotation of the three cylinder. It's really a question of torque curves rather than absolute torque, and that's something that can really only be determined by looking at dyno charts of both engines.
Farmwithjunk
Super Member
</font><font color="blue" class="small">( The only thing that matters is what rpm you're measuring the torque at. If they both make 10HP@10RPM, they both have 5,250 ft/lbs of torque. If they have the same displacement, then the longer stroke of the 2cyl is offset by the larger number of power pulses per rotation of the three cylinder. It's really a question of torque curves rather than absolute torque, and that's something that can really only be determined by looking at dyno charts of both engines.
)</font>
Best comment so far on the subject!
Back in the early 60's, Ford quit using a 4 cylinder, and replaced it with a 3 cylinder in several tractor models. Power, specifically torque increased dramatically. That was always credited to the reduction of cylinders, and increase in stroke. While those facts made a significant difference, you need to look at fuel delivery systems, cam and valve train redesign, increased mass of the flywheel and crankshaft, and better piston design. There is no "magic formula" to increase torque. As stated in my first post in this thread, # of cylinders CAN have an effect on torque, but on its own, is not always the answer. Rotating mass is more likely to effect torque #s. (i.e. a 200 cu. in engine with a 75 lb crankshaft will more than likely have more torque than a 200 cu. in. engine with a 50 lb. crank, but not as a "hard and fast rule".[ Assuming BOTH operate at the same RPM's.])
)</font>
Best comment so far on the subject!
Back in the early 60's, Ford quit using a 4 cylinder, and replaced it with a 3 cylinder in several tractor models. Power, specifically torque increased dramatically. That was always credited to the reduction of cylinders, and increase in stroke. While those facts made a significant difference, you need to look at fuel delivery systems, cam and valve train redesign, increased mass of the flywheel and crankshaft, and better piston design. There is no "magic formula" to increase torque. As stated in my first post in this thread, # of cylinders CAN have an effect on torque, but on its own, is not always the answer. Rotating mass is more likely to effect torque #s. (i.e. a 200 cu. in engine with a 75 lb crankshaft will more than likely have more torque than a 200 cu. in. engine with a 50 lb. crank, but not as a "hard and fast rule".[ Assuming BOTH operate at the same RPM's.])
Farmwithjunk
Super Member
</font><font color="blue" class="small">( The only thing that matters is what rpm you're measuring the torque at. If they both make 10HP@10RPM, they both have 5,250 ft/lbs of torque. If they have the same displacement, then the longer stroke of the 2cyl is offset by the larger number of power pulses per rotation of the three cylinder. It's really a question of torque curves rather than absolute torque, and that's something that can really only be determined by looking at dyno charts of both engines.
)</font>
Best comment so far on the subject!
Back in the early 60's, Ford quit using a 4 cylinder, and replaced it with a 3 cylinder in several tractor models. Power, specifically torque increased dramatically. That was always credited to the reduction of cylinders, and increase in stroke. While those facts made a significant difference, you need to look at fuel delivery systems, cam and valve train redesign, increased mass of the flywheel and crankshaft, and better piston design. There is no "magic formula" to increase torque. As stated in my first post in this thread, # of cylinders CAN have an effect on torque, but on its own, is not always the answer. Rotating mass is more likely to effect torque #s. (i.e. a 200 cu. in engine with a 75 lb crankshaft will more than likely have more torque than a 200 cu. in. engine with a 50 lb. crank, but not as a "hard and fast rule".[ Assuming BOTH operate at the same RPM's.])
)</font>
Best comment so far on the subject!
Back in the early 60's, Ford quit using a 4 cylinder, and replaced it with a 3 cylinder in several tractor models. Power, specifically torque increased dramatically. That was always credited to the reduction of cylinders, and increase in stroke. While those facts made a significant difference, you need to look at fuel delivery systems, cam and valve train redesign, increased mass of the flywheel and crankshaft, and better piston design. There is no "magic formula" to increase torque. As stated in my first post in this thread, # of cylinders CAN have an effect on torque, but on its own, is not always the answer. Rotating mass is more likely to effect torque #s. (i.e. a 200 cu. in engine with a 75 lb crankshaft will more than likely have more torque than a 200 cu. in. engine with a 50 lb. crank, but not as a "hard and fast rule".[ Assuming BOTH operate at the same RPM's.])
