Why does a 2.0 liter engine use less fuel than a 4.0 liter engine?
October 30, 2009 in Other - Cars & Transportation
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Nathan L questioned:
Let’s take upon yourself that here are 2 choices of a diesel engine to place into a car. One is a 4 liter engine and the additional is a 2 liter engine. Both are often unfilled industrial engine from Cummins, John Deere, Isuzu, Kubota, Deutz, VW, etc. Both have fuel curves that are just so .34 pounds of fuel per horsepower-hour at 1800 RPMs. Why is here an benefit in the fuel efficiency of the smaller displacement engine, even even if they are rated the same to push, say, a 5000 pound pickup? (This is right, even if we assess for the added consequence of the better engine). Something does not make implication here. If both are cruising at 65 MPH and the vehicles weigh the same, shouldn’t they use just so the same amount of fuel per mile?
I realize it has more displacement. But, a 5000 lb car tender at a continuous speed requires the same horsepower to keep it tender. Say it uses 80 HP…..80 era .34 must be about 27 lbs of fuel per hour in any case of the displacement of the engine. Why in real do, does the 2.0 liter engine get better mileage?
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It has 2X the displacement. So it’s burning more air, and more air earnings more fuel is burned. Simple ample.
Hey, Gerald! Which weighs more? A pound of nails or a pound of fine hair? *laughter*
Well…. a 2.0 liter engine has a smaller bore for the pistons than a 4.0. Larger engine=more gas looked-for to go the pistons=more horsepower. A smaller engine can not push the same HP as a better engine at the same RPM. Torque is inane to be a HUGE come forth with the smaller engine as well. They may consume the amount of fuel per HP, but the better engine is inane to eccentric out more HP.
“Both have fuel curves that are just so .34 pounds of fuel per horsepower-hour at 1800 RPMs”
4ltr engine will develop a stuck-up pony potential at the agreed rpm than the 2ltr unit. I’ll place you to do the maths.
You gave a lot of factors/in rank in your question. But I feel it has to be the consequence difference. A 2 liter engine must be 2 liters lighter than a 4 liter engine. That would be like adage a 6ft 180lb woman weighs less than a 5ft 180 lb man.