In addition to the common automobile engine, the marine engine is also one of the important loading tools. Marine engines are generally used in large ships. The speed of this engine is generally slow, but the power can still remain strong. Diesel engines or turbines are common.

What is a marine engine

What is the difference between the application of marine engine and vehicle engine?

Large marine engines are generally low-speed two-stroke engines and can burn heavy oil. Marine engines generally use piston diesel engines. Huge diesel engines generally use two-stroke engines. The crankshaft rotates twice to do work once, which is similar to that of motorcycles. The cylinder diameter of large marine engines is close to one meter and can reach tens of thousands of horsepower. The larger ones are about 100000 horsepower and weigh thousands of tons.

Introduction to marine diesel engine

Marine diesel engine has high thermal efficiency, good economy, easy starting and great adaptability to all kinds of ships. It has been used as ship propulsion power soon after its advent. By the 1950s, diesel engines almost completely replaced steam engines in newly built ships. Marine diesel engines are generally divided into high-speed, medium speed and low-speed diesel engines.

Difference between marine and vehicle

General marine engines belong to the category of low-speed engines. The engine speed is generally below 800rpm (except for special speedboats), because the marine engine needs to be matched with the propeller, and the propeller speed is about 600-800rpm. Considering the matching efficiency value, too high engine speed is not beneficial.

Car engines are more general. General commercial vehicles (heavy trucks) and construction machinery vehicles are mainly diesel engines, mostly six cylinder four stroke compression ignition. Passenger cars (cars, etc.) are generally gasoline engines (except special off-road vehicles), which need to be ignited by spark plugs. The engine structure varies with different displacement.

The speed of marine engine is kept low because it should match the speed of propeller. Among marine engines, diesel engines are more common. After all, the fuel technology is more mature, and the promotion of turbines still needs some technical space. In addition, the structure and principle of marine engine are similar to that of automobile engine.