The engine is the most important part of any motorized BOV. It will weigh heavily on the power, range, reliability, and many other factors of your vehicle's performance.
- Horizontally Opposed -
- Straight -
As a general rule, with many exceptions, larger engines have more horsepower and inferior fuel efficiency while smaller engines have superior fuel efficiency and less power.
- 1 and 2 Cylinder engines are typically used by small vehicles such as motorcycles and dirt bikes.
- 3 Cylinder engines are fairly rare and usually only used by very small cars and some utility equipment such as tractors.
- 4 Cylinder engines are very common in cars and other light vehicles, they offer a compromise between power and efficiency with a bias toward efficiency.
- 6 Cylinder engines are common in cars and other light vehicles, they offer a compromise between power and efficiency with a bias toward power.
- 8 Cylinder engines are typically used by Trucks and large SUVs. They generally have superior power, but inferior efficiency.
- Gasoline is generally more commonly used by light vehicles, it generally yields superior acceleration and a lower cost per gallon, but has inferior efficiency and engines that use it require more frequent maintenance.
- Diesel is usually used by heavy and industrial vehicles as well as many trucks and SUVs. These usually cost more to purchase, but save money on fuel costs and maintenance.
Turbo/Super/Ram Air Chargers
All air chargers work based on the concept that a higher quantity of oxygen allows an engine to operate more efficiently and with more power. They provide greater oxygen through more efficent intake or by compressing intake air prior to injection into the engine.
- Turbos use pressure from exhaust gases to compress air prior to injection. They are very efficient as they add minimal load to the engine. They also tend to perform better at higher RPMs, but are less effective at low RPMs.
- Super Chargers use power taken directly from the crankshaft to compress air prior to injection. They have a significant advantage at lower RPMs, providing more power during acceleration, but they become less effective at higher speeds.
- Ram Air Chargers use the forward motion of the vehicle to "scoop" or force more air into the engine's intake. They are less effective than other charges, but they are also far simpler and more reliable.