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4 cylinder versus 8 cyclinder equal torque.?
ok this question is a little hard to explain but here goes:
lets say you have a 2 litre 8 cyclinder engine (im not an expert but bear with me.) only examples not real life
lets say each cylinder has 2 units of pressure on shaft ie 2newton meter of torque. so lets say
the torque on the shaft is 16 units 2units x 8 pistons parrallel torque.
how would you equal "that" torque on a 2 litre 4 piston. each piston would move twice further to displace the same amount. but how does that translate to torque. i know there is some formulae for this (the length of the levereage from the shaft to the force appled ... something like that. what length wouls i need to exactly equal the torque of the 8piston
anyone googd a physics or mechanics engineereing
5 Answers
- 1 decade ago
torque, in US measurements, is defined as the following:
1 foot-pound of torque is equal to the amount of energy to stop a rotating arm that exerts 1 pound of pressure at a 1 foot distance from the center line.
So, basically, what you're talking about, is this.
If you have an 8 cylinder engine that makes 100ft-lb torque, with one power pulse every 90 degrees of crankshaft rotation, then for a 4 cylinder to make the same with just one power pulse every 180 degrees of rotation, you would need to double the stroke.
- Kent HLv 61 decade ago
Since
Force (lb) = pressure (psi) x area (sq in)
increase the area of the piston
4A2 = 8A1
or
increase the pressure
torque = force x distance (offset from axis of crankshaft to piston connection)
the piston moving up and down doesn't to create torque. the piston goes around the crankshaft during this displacement. so the crankshaft could have twice the offset from the axis.
- Hank ScorpioLv 71 decade ago
Horsepower is horsepower and torque is torque...doesn't matter how many cylinders it's coming out of.
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