Here's why:
* No Separate Oil Sump: 2-stroke engines don't have a dedicated oil sump or oil pump.
* Combined Fuel-Oil Mixture: The oil is pre-mixed with the gasoline and then drawn into the engine's combustion chamber.
* Lubricating Moving Parts: As the fuel-oil mixture burns, the oil vaporizes and coats the moving parts like the piston, cylinder walls, connecting rod, and bearings, reducing friction and wear.
Why is this necessary?
* High RPM and Stress: 2-stroke engines operate at higher RPMs and experience more stress than 4-stroke engines, requiring constant lubrication.
* Limited Sealing: 2-stroke engines have less effective sealing between the crankcase and the combustion chamber, allowing some oil to escape into the exhaust.
* Cooling: The oil also acts as a coolant, absorbing heat generated by the engine.
Consequences of Not Mixing Oil:
* Severe Engine Damage: Without proper lubrication, engine parts will rapidly wear down, causing excessive friction, scoring, and eventual catastrophic failure.
* Premature Engine Failure: The engine will seize up, leading to costly repairs or complete replacement.
Important Notes:
* The correct oil-to-gas ratio is crucial and varies depending on the specific engine model. Consult the owner's manual for recommended ratios.
* Using the wrong type of oil can lead to problems as well. Always use high-quality, 2-stroke engine oil designed for your specific application.
* Modern 2-stroke engines often feature separate oil injection systems that deliver oil directly to the combustion chamber, eliminating the need for pre-mixing.
