Do you know the difference between marine engines and car engines?

‌1. Different compression ratios:

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

2. Different crankshaft speeds:

Gasoline engines are generally 5000r/m, and diesel engines are 3000r/m;

Gasoline engines have lower power, smoother operation, and lower noise than diesel engines; they are lighter and smaller in size; the distance between the journal and the bearing is smaller (generally, gasoline engines are 0.05mm, and 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, diesel engines have much lower HC and CO emissions, generally only a few tenths of that of gasoline engines. Diesel engines also have comparable NOX emissions, but diesel engine particulate emissions are approximately 30 to 80 times that of gasoline engines.