Engine Repair

This article discusses two types of engines: the Miller-cycle engine and the diesel engine.

Miller-cycle engine

The Miller-cycle engine is a modified version of the four-stroke-cycle engine that uses a supercharger to force air into the engine, creating more power.

• The compression stroke is shorter than that of a conventional engine because the intake valve stays open longer and delays compression.
• Pressure from the supercharger prevents the air/fuel mixture from flowing out the intake valve opening.
• The effect of these changes in the four-stroke cycle is a reduction in the power required to run the engine.

Diesel engine

German engineer Rudulf Diesel had a dream of building an engine that was more efficient than the conventional gasoline engine. He invented the diesel engine and patented it in 1892.

• Diesel engines use a different method of igniting the fuel. They take in air, compress the air, and then use the heat of the compressed air to ignite the fuel. They do not use spark plugs.
• Diesel engines have higher compression ratios than gasoline engines.
• Diesel engines produce more torque than gasoline engines.