Yeah, there are some monster diesel engines. I did a little research and found that the straight six diesels in the busses at the U of I are ~ 350 hp/1000+ lb-ft.
You do the math.
Torque = HP * 5252 / RPM.The engine also weighs probably 200lbs.. they weren't exactly efficient back then.
Well, if you want to get real picky it's power so it's a rate of energy but for the purposes of ATOT I don't think we'll ever get past dividing things into power and force, so I'll stick with my statement.
No. it is not because deisel is slow burning.
Deisel needs a lot of compression to burn. That means you need a 'thin' piston with a high stroke (a wide piston with a short stroke wouldnt 'do' as the deisel needs to be in a small concentration in order to burn). Since the high stroke has so much further to 'travel' compared to a petrol engine's relative wide piston and short stroke, thats why they cannot rev very high.
The high torque level is directly related to the long stroke - it means more mechanical advantage.
This is very similar to a low revving V8 (numbers of cylinders or capacity have nothing to do with it, just giving it a name) compared to a high revving 1600cc. Just a deisel has an even bigger difference.
Deisel needs a lot of compression to burn. That means you need a 'thin' piston with a high stroke (a wide piston with a short stroke wouldnt 'do' as the deisel needs to be in a small concentration in order to burn). Since the high stroke has so much further to 'travel' compared to a petrol engine's relative wide piston and short stroke, thats why they cannot rev very high.
The high torque level is directly related to the long stroke - it means more mechanical advantage.
This is very similar to a low revving V8 (numbers of cylinders or capacity have nothing to do with it, just giving it a name) compared to a high revving 1600cc. Just a deisel has an even bigger difference.
They can, but thats nothing to do with it - its all relational.
In most cases the bore/stroke ratio of a deisel remains the same - small bore compared to high stroke - thats why most deisels cant reve very high.
In most cases the bore/stroke ratio of a deisel remains the same - small bore compared to high stroke - thats why most deisels cant reve very high.
I'm sorry but I just don't agree that there is an inherent need for long stoke diesels. Large "industrial type" engines, whether gas or diesel, have an incentive to be long stroke. The don't need to operate at high speed but they do need to operate at maximum output for long periods of time with great reliability. In a tractor, for instance you want to run it constantly at full power and expect a 10 or 20 year span between overhauls. So you design and govern it to operate at a torque peak of, say, 2200 rpm. Back on the farm we had diesel and gas tractors and they both had similar long stroke designs.
To have a large displacement in these engines, you need a long stroke. If you make the bore large, the piston becomes so heavy you can't get any engine speed out of it at all.
On the other hand, automotive diesels operate at higher speeds, have a lighter weight design since they don't operate at constant maximum output. These engines tend to have square bores like gasoline engines. For example, the latest Mercedes diesel V8 has 86mm bore and 86mm stroke. I recently saw a planned Dodge diesel for SUVs and it's dimensions were 94mm x 100mm.
To have a large displacement in these engines, you need a long stroke. If you make the bore large, the piston becomes so heavy you can't get any engine speed out of it at all.
On the other hand, automotive diesels operate at higher speeds, have a lighter weight design since they don't operate at constant maximum output. These engines tend to have square bores like gasoline engines. For example, the latest Mercedes diesel V8 has 86mm bore and 86mm stroke. I recently saw a planned Dodge diesel for SUVs and it's dimensions were 94mm x 100mm.
It's true that a diesel doesen't have to have a long stroke.. It's really dependant on the combustion chamber design.
But since a diesel's compression ratio is usually around 18:1 or greater.. the easiest way to do that is with a long stroke, and of course that inhibits maximum RPM.
torque is why i spin my tires gunning it from 1200rpm and why mr honda has to rev to 6k or higher to do the same
When accelerating, torque is what puts you in your seat.. so yes, it is important for that.
Torque is a measure of the rotational force of a shaft.
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