Engine position:

Front engine

* The large mass of an engine at the front of the car gives the driver protection in the event of a head on collision.

* Engine cooling is simpler to arrange

* In addition the cornering ability of a vehicle is normally better if the weight is concentrated at the front.


Rear engine

* It increases the load on the rear driving wheels, giving them better grip of the road. Most rear-engine layouts have been confined to comparatively small cars, because the heavy engine at the rear has an adverse effect on the ‘handling’ of the car by making it ‘tail-heavy’.

* Also it takes up good deal of space that would be used on a front-engine car for carrying luggage. Most of the space vacated by the engine at the front end can be used for luggage, but this space is usually less than that available at the rear.


Central and mid-engine

* These engine situations generally apply to sports cars because the engine sitting gives a load distribution that achieves both good handling and maximum traction from the driving wheels.

These advantages, whilst of great importance for special cars, are outweighed in the case of everyday cars by the fact that the engine takes up space that would normally be occupied by passengers. The mid-engine layout shown combines the engine and transmission components in one unit. The term mid-engine is used because the engine is mounted in front of rear axle line.




Drive arrangements:


Front engine and rear-wheel drive



*Better axle load distribution

*Better road grip

*Comfort riding

*Better cooling

*Less noise (long exhaust pipe)

*Use a long engine



*Heavy (more weight)

*The passenger compartment has the propeller shaft tunnel.




Front engine and front-wheel drive



* More space in passenger compartment.

* Easy to place the fuel tank (bigger)

* More safe in the event of head on collision. (engine mass)

* Shorter car length and better passenger compartment

* Better cooling

* No problem in steering the car in a slippery road.



* The need to a power steering

* More tire wear in the front axle

* Less brake efficiency, 75% front and 25% rear.

* Less climbing ability

* Less accessibility for engine parts (maintenance)



Rear engine and rear wheel drive



* Good brake distribution on the axles

* Better climbing ability and acceleration

* Less steering effort



* More rear wheel tire wear.

* Bad cooling

* Less space for luggage

* Sensitive to the wind.

* Less safety (front fuel tank)



Four-wheel drive



* Better traction

* Less risk of wheel spin

* Minimizes the possibility of wheel lock-up when braking the car.

* More gradient ability



* Heavier

* Increase the fuel consumption

* Tires wear if driven on a paved road.