Why cars motor is on the front and not on the back of the car?
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Cabin space and power efficiency.
Most cars are front wheel drive due to ease of driving, so putting the engine at the front essentially bundles up the drivetrain in a one neat package.
If you had the engine on the back, you’d need to connect the engine to the front wheels, which means a long driveshaft has to go through the length of the car.
This reduces interior space and causes loss of power due to friction, etc.
Having the engine on the front also has cooling advantages, as you simply need a big radiator on the front and short coolant pipes.
If you had the engine on the middle or the rear, you’d either need long piping or have to place the radiators on the sides/back, which affects ease of maintenance and interior & cargo space.
Mid or rear engine layout is used in sports cars or racing cars, because it allows you to centralize the mass to the center of the car, improving handling and providing aerodynamic benefits (can have low & sleek front end, more room for aero elements that manipulate the air and generate downforce, etc.)
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