Marine diesel engine parts introduce the difference between marine diesel engine and vehicle diesel engine

1. The compression ratio is different:

The compression ratio is the ratio of the gas volume in the cylinder before and after compression. The engine converts heat energy into mechanical energy by mixing air and fuel oil to drive the equipment to work. Because diesel has no knock, it can withstand a higher compression ratio than gasoline (generally, gasoline engine 8-10:1, diesel engine 16-20:1), so the efficiency is also high.

2. The crankshaft speed is different:

Gasoline engine generally 5000r/m, diesel engine 3000r/m;

Compared with diesel engines, gasoline engines have lower power, stable operation and lower noise; light weight and small size; and the distance between the journal and the bearing bush is small (generally, gasoline engines are 0.05mm, diesel engines are 0.2mm).

3. Different emissions:

Gasoline engine emissions are mainly HC, CO, and NOX, while diesel engines are mainly NOX, PM, HC, and CO.

Compared with gasoline engines, the HC and CO emissions of diesel engines are quite low, generally only a few tenths of gasoline engines. The NOX emissions of diesel engines are also comparable to gasoline engines, but the particulate emissions of diesel engines are about 30 to 80 times that of gasoline engines.