Because combustion takes place with each revolution of the crankshaft with a 2-stroke, this format puts out more power than a 4-stroke engine and the power has more instantaneous delivery. This are some reasons why 2-stroke engines have a long history of use on many different types of motorcycles.

A refrigerator is a reversed heat engine, where heat is pumped from a body at low temperature to a body at high temperature. Any refrigerating system is a heat pump, which extracts heat from a cold body and delivers it to a hot body. A heat engine is a system which converts Thermal energy into Mechanical Energy.

Accordingly, the overall brake thermal efficiency of the engine is a product of the combustion, thermodynamic, gas exchange, and mechanical efficiency.

• Engine Energy Losses. Summary of Losses. Fuel Energy. Combustion Efficiency. Thermodynamic Efficiency. Heat Losses.
• Efficiency from the Perspective of the Fuel.

Generally, the expansion ratio is equal to the expansion ratio in piston ported two-stroke engines. In a two-stroke the exhaust may open as much as 90 degrees before bottom dead centre, thus wasting 50% of the power stroke and drastically reducing efficiency at the expense of high power output at higher rpm.

Carbureted two-stroke engines perform significantly worse than four-stroke and direct-injection two-stroke motors at the same speed, and can use about twice as much fuel per horsepower.

The results showed that a maximum brake thermal efficiency of 47.2% can be achieved for the two-stroke BUSDIG engine with lean combustion and water injection.

Excess oil can produce a smoky exhaust, oil leaking out of the muffler, and sometimes loss of power. While not ideal, these issues can be fixed by simply replacing the fuel in the tank with properly mixed fuel. But running a two-cycle engine with too little oil can actually destroy the unit.

Without this coating, the metal components quickly heat up through the increased friction and begin shedding tiny particles and fragments as they become damaged. These fragments themselves will then cause even further degradation as they scratch and scrape between the precisely machined moving parts.

Member. 2-strokes run fine without mufflers, if your muffler pipe is an expansion chamber you might notice a low to medium power loss, but you should be fine.

around 40 hours

It’s very common to rebuild 2-Stroke engines that have been seized. Sometimes you can get away without rebuilding a seized 2-stroke engine if the damage isn’t too bad. The engine will simply stop (piston expands in the bore)… but will start again when it cools down.