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nissan z24 (old model) - diesel engine selection for a pick up truck - mojtaba

we are going to equip a pick up truck (Nissan z24-old model)with a diesel engine.there are two selection for us.a diesel engine 1.5 liter with maximum torque 200 n.m and a 2 liter engine 252 n.m.
car curb weight is 1550 kg ,gross weight 3500 kg.
current gasoline engine spec. 180 n.m and power :100 hp (just for information)
would you please help us which engine is suitable roughly?
keep in your mind that users of this car expect to load this car up to 2000 kg normally.(somehow like light truck).
we want to consider an diesel engine with two important outcome: 1)good performance and feeling in driving specially in low RPM 2)low fuel consumption

thanks in advanced
mojtaba

nissan z24 (old model) - diesel engine selection for a pick up truck - RobJP

A 1.5 will barely be able to get it up a hill, if it's got a bit of weight in it.

You'd probably find the 2.0 diesel would, in the real world, give similar or possibly even better fuel consumption, due to the higher torque, and not needing to rev the engine to death, and being able to run in a higher gear.

nissan z24 (old model) - diesel engine selection for a pick up truck - Peter.N.

The bigger engine you can fit the better, you will pay little or no penalty in fuel consumption as the engine will be working less hard and thus running on a leaner mixture.