Forklifts are classified as vehicles with small engines. The engines of the forklift all follow the principles of internal combustion, while the many models and makes of forklift will have a different design and layout. Forklifts are made more toward producing high torque than for speed. They usually are geared to low speeds. The engine powers the forklift's drive wheels. The engine is also needed to lower and raise the forks via a series of chain pulleys. Nearly all modern forklift engines are fueled by propane since they will be utilized indoors, where gasoline and diesel engines will be unsuitable because of the exhaust they create.
A four-cylinder engine-block is normally found in a lift truck. A lot like the engine in small cars, forklift engines have cylinders that contain pistons connecting to a camshaft. The head of each and every cylinder consists of an intake hatch, an exhaust hatch and a spark plug, each of them spring-loaded and one-way.
Once the driver starts up the forklift engine, propane passes through the opened throttle-plate in a fine spray and mixes together with air that comes from the mass air intake before moving into the cylinder head intake hatches. Each one of the four pistons is staggered to rise in a precise sequence, that compresses the air and propane mixture as every piston rises to the top of the head. With timing which is very precise, the engine's battery and alternator produce an electrical current that passes through the spark plug. The fuel ignites leading to an explosion that drives the piston back down to the bottom of the cylinder, resulting in a continuous turning of the camshaft. In the cylinder, an air pressure imbalance causes the exhaust to be drawn out through the exhaust hatch as more fuel passes into the cylinder. Propane burns cleaner compared to gasoline and diesel and the exhaust is not as harmful.