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HOME > CONSUMER PRODUCT INFO > GUIDE TO LOW EMISSION ENGINES >
Homeowners Guide
To Low Emission Engines
Engine Designs
Overhead Valve vs. Side Valve
Overhead valve design benefits
- runs cooler
- burns cleaner
- more fuel efficient
- low emissions
Single valve design benefits
- lower cost
Twin Cylinder vs. Single Cylinder Engine Design
Twin cylinder
The movement of the two pistons provides natural total counter-balancing. Vibration levels are reduced to a minimum, thereby increasing operator comfort and extending equipment life.Single cylinder
The action of one piston works in the opposite direction of an internal counterweight to minimize vibration.
A Word About Two-Cycle And Four-Cycle Gasoline Engines
Throughout this guide, you will find references to four-cycle and two-cycle engines. Four-cycle engines operate by creating combustion from gasoline fed into the carburetion system where the fuel mixture is ignited by a spark plug to power the engine's pistons.
On a four-cycle engine, oil is stored in a separate chamber to provide lubrication to moving parts.
Two-cycle oil is specially formulated to be pre-mixed and stored in the gas can before being added to the equipment's fuel tank. Also, remember that using a non-spill container can be environmentally helpful. Two-cycle oil is available from outdoor power equipment dealers, and the lawn and garden sections of discount chains, home centers and hardware stores.
