Two stroke
Four stroke
Typically a two-stroke is air cooled, while a four-stroke is water cooled, so the water cooling adds these additional items:
By putting only gasoline in a two stroke engine you can destroy it. A two stroke engine requires oil to be mixed into the gasoline to keep the moving parts lubricated. When you do not have that oil there it will not lubricate correctly and therefore scar and break the moving parts on the inside.
the 2 stroke has more rpm than 4 stroke because it has less moving parts and the cycles are faster because there is only 2 and in the 4 stroke there is 4
A two-stroke engine is an internal combustion engine that completes the process cycle in one revolution of the crankshaft (an up stroke and a down stroke of the piston, compared to twice that number for a four-stroke engine). This is accomplished by using the beginning of the compression stroke and the end of the combustion stroke to perform simultaneously the intake and exhaust (or scavenging) functions. In this way, two-stroke engines often provide strikingly high specific power, at least in a narrow range of rotational speeds. The functions of some or all of the valves required by a four-stroke engine are usually served in a two-stroke engine by ports that are opened and closed by the motion of the pistons, greatly reducing the number of moving parts.
An internal combustion engine typically has several moving parts, including the pistons, crankshaft, camshaft, connecting rods, and valves. The total number of moving parts can vary significantly depending on the engine design and configuration, but a standard four-stroke engine may have around 20 to 30 individual moving components. This count can increase with more complex designs, such as those with turbochargers or multiple camshafts.
The engine will overheat & seize due to lack of oil. A 2 stroke needs a fuel oil mix to lubricate it's moving parts.
Two-stroke engines usually do not have an internal lubrication system; the moving parts are lubricated by a small flow of lubricating oil which enters the combustion chamber pre-mixed with the fuel. This oil is usually not completely burned during the power stroke, and therefore a portion of it clings to the cylinder walls, passes into the crankcase, and eventually reaches all moving parts of the engine.
Yes, two stroke (or Two cycle) engines have oil that is mixed into the fuel to lubricate the motor's moving parts. Where as, in a 4 stroke engine the oil is separate from the fuel. When the fuel oil mix is burned in a two cycle engine more pollution is given off.
Have you noticed there is no place to put oil in your 2 cycle engine? Inside your engine there are several moving parts used to convert gasoline to rotary motion. Without oil these parts will create a great deal of friction and heat causing permanent failure in minutes at best. Beating the engine with a sledge hammer will do not more damage than running an engine without oil. The oil for these moving parts in a 2 cycle engine is provided by the mist of gasoline and oil that is routed around the moving parts before it is burned in the engine.
To reduce friction by providing lubrication to the moving parts.
For a set amount of power, they're heavier, bigger and use more parts than a 2-stroke engine.
The Wankel engine operates on a rotary design, using a triangular rotor that moves in an epitrochoidal path within a housing, resulting in continuous rotation and fewer moving parts compared to a traditional 4-stroke engine. In contrast, a 4-stroke engine relies on a linear reciprocating motion of pistons, completing four distinct strokes (intake, compression, power, exhaust) in two revolutions of the crankshaft. This fundamental difference in design leads to variations in efficiency, power delivery, and size, with the Wankel engine often being more compact and smoother in operation. However, it typically has lower thermal efficiency and higher emissions compared to conventional piston engines.
The number of non-moving parts in an engine can vary significantly depending on the engine type and design. Generally, non-moving parts include components such as the engine block, cylinder head, intake and exhaust manifolds, oil pan, and various gaskets and seals. In a typical internal combustion engine, there can be dozens of non-moving parts, but the exact count will depend on the engine's complexity and configuration.