1. Two-stroke vs. Four-stroke Engine
These are the two main types of IC engines based on their working cycle.
| Two-stroke Engine | Four-stroke Engine | |
|---|---|---|
| Power Stroke | One power stroke for every 1 revolution of the crankshaft. | One power stroke for every 2 revolutions of the crankshaft. |
| Efficiency | Lower fuel efficiency due to incomplete combustion. | Higher efficiency with complete combustion. |
| Power Output | Higher power-to-weight ratio; more power in a short time. | Lower power-to-weight ratio but smoother operation. |
| Durability | Wears out faster due to more frequent power strokes. | Longer lifespan with less wear and tear. |
| Fuel Consumption | Consumes more fuel and sometimes requires oil mixing. | Consumes less fuel and no oil mixing needed. |
| Applications | Motorcycles, chainsaws, outboard motors, etc. | Cars, trucks, generators, etc. |
| Maintenance | Higher maintenance due to faster wear. | Requires less frequent maintenance. |
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