Can the engine of a small car drive a truck through an oversized gearbox?

The torque difference between a car engine and a heavy truck engine.

The picture above is a liberation tractor, diesel turbocharged engine, displacement liters, maximum power 407 kilowatts, maximum torque 2600 Nm, maximum torque speed of 1200-1300 rpm.

The gasoline engine is compared with Volkswagen's EA888 series gasoline turbocharged in-cylinder direct injection engine, which has a displacement of liters, a maximum power of 147 kilowatts, a maximum torque of 280 Nm, and a maximum torque speed of 1700-5000 rpm.

Now if we want to make this gasoline engine output a maximum torque of 2600 Nm, we need to install a reduction ratio reduction mechanism at the output end of the engine without considering the mechanical loss, that is, a small gear at the output end of the engine crankshaft is used to drive a large gear that is twice larger than it, and the output of the large gear is the final output of the engine. In this way, the petrol engine was transformed into an engine with a maximum output torque of 2,600 Nm.

With enough torque, this engine can easily drive the truck to the ground. But we also have to consider these two questions:

1. Vehicle speed. <>

When the engine speed of the large truck is about 1300 rpm when the truck is running normally, so the engine with the deceleration mechanism wants to get the speed of 1300 rpm at the output end, then the engine speed must reach 1300 rpm. It's clear that it can't be done. The red line speed of this gasoline engine is about 6000 rpm, and the output speed is 646 rpm after deceleration and torque.

The revs are so low that the car can't run.

2. Engine bearing capacity.

When the gasoline engine outputs maximum torque, the turbocharger is working at full load and will soon be burned red. As a result, it was hard to scrape together enough torque, but the result was that not only did the speed of the car not meet the requirements, but the engine could not withstand it for too long.

It's like Hercules and the sprint champion moving things, Hercules can move them all at once, while the sprint champion can only take a little at a time, and he has to take out the speed of the 100-meter sprint 10 times to complete the task, and the result is likely to be "die before he gets out of the school".

No, the nature of the two is different, one is high speed and high torque, and the other is low speed and high torque, so there is no way to be well compatible and naturally cannot meet the needs of the drive.

Yes, the principle is very simple, the lever principle we learned in junior high school, give me a fulcrum to pry the earth. There is a little girl in the textbook who pulls up a cow through a fulcrum and nine hanging hubs, and now the wheels can be replaced with gears.

No. The engine torque of a car is limited, regardless of the size of the gearbox, and the torque of the car cannot drive the truck.