There are two types of engines found in nearly every car and truck on the road. They used what is called four strokes reciprocating internal combustion engine which is a high horse powered type of engine. Both gas and diesel engines use this type of application. A third type called a two stroke engine, found in lower powered applications such as:
- Lawn and garden equipment
- Dirt bikes
- Jet skis
- Small outboard motors
- Radio controlled model planes
- Chain saws and jet skies
Advantages of two stroke engines
- Two stroke engines do not have valves which are easy to construct and lowers their weight
- Two stroke engines fire once every revolution while four stroke every other revolution,
- this two stroke engines lower output in horse power
- Two stroke engines can work in any position, since oil flow is not a concern with any valves to worry about.
Disadvantages of two stroke engines
- Two stroke engines do not last as long as four stroke engines; there is no lubrication system in a two stroke engine so parts wear out a lot faster.
- Two stroke oil is expensive; you would burn a gallon every 1000 miles if it were in a car
- Two stroke engines use more fuel
- Two stroke engines produce a lot of pollution, and the way the engine is designed that part of the air/fuel leaks out of the chamber through the exhaust port, which is why you see a small thin film, or sheen, of oil around any two stroke outboard motor, and this leaking oil is a real mess for the environment. This is the reason why two stroke engines are used only in application where the motor is not used very often and a fantastic power-to-weigh ratio is important.