2-stroke engines produce much more power than 4-stroke.
In a 2 stroke, every second stroke of the engine is a power stroke. In a 4 stroke, every 4th stroke of the engine is a power stroke. Knowing this, a 2 stroke has double the power as a 4, in the same cc
The combustion cylcle (power stroke) forces piston down to create engine power.
if the diameter of cylinder and stroke length of an I.C. engine is greater then the power output is more.
if the diameter of cylinder and stroke length of an I.C. engine is greater then the power output is more.
if the diameter of cylinder and stroke length of an I.C. engine is greater then the power output is more.
2 stroke means it takes two strokes for a power stroke and 4 sroke takes four strokes for power stroke so in otherwise 2 strokes are way faster and more torqey
For a set amount of power, they're heavier, bigger and use more parts than a 2-stroke engine.
Most small engines are two stroke because you can get more power from a smaller engine with two stroke rather than a four stroke engine. It takes less to cool and to operate the engine.
2 Strokes make much more power per cc than 4 strokes. For example a 2 stroke 125 and a 4 stroke 250 both make about the same power 4 strokes have much more low end torque though
No but it might smoke more
A 4-stroke will run quieter and cleaner. It will rev lower. For a given engine power it'll be heavier and bigger. For a given engine power it'll use less fuel. The engine will need more parts and be more complicated 4-strokes generally have better torque at low revs. A 2-stroke will run noisier and pollute more, It will rev higher, for a given engine power it'll be smaller and lighter. For a given engine power it'll use more fuel. The engine will consist of fewer parts, and be a simpler design. 2-strokes generally have less torque at low revs but do better at high revs.
A 2-stroke engine makes power every2 cycles were a 4-stroke makes power every 4.Hence 2x power. This is absolutely INCORRECT! A two stroke engine develops it's PEAK horse power twice as fast as a four stroke for the reason given but that is it. For a given displacement a four stroke engine will ALWAYS make more torque and horsepower than a two stroke engine of equal displacement. This is due to the fact that a four stroke engine cleans the cylinder of contaminated (exhaust) air, compresses the air/fuel to a more efficient level, and draws a cleaner air/fuel mixture into the cylinder as there is no slow burning, air/fuel mixture contaminating oil mixed in the combustion charge. I have over forty years experience working on engines, and can tell you, the ONLY reason two stroke engines have lasted this long, is due to the fact that they weigh less than an equivalent horsepower four stroke engine. If they DID develop more horsepower, the four stroke would not have become the standard internal combustion engine used in transportation, generators, air compressors and the like.