What Does The Letter Of Engine Hood Stand?

On the Dongfeng Engine Hood, you will often see letters such as SOHC, DOHC, OHV, OHC, etc. What do they mean?

OHV refers to the overhead valve, the bottom camshaft, that is, the camshaft is arranged at the bottom of the cylinder, and the valve is arranged at the top of the cylinder.

OHC refers to the overhead camshaft, that is, the camshaft is placed on top of the cylinder.

The SOHC is a single overhead camshaft, and only one camshaft at the top of the cylinder is responsible for opening and closing the intake and exhaust valves.

The DOHC is a double overhead camshaft. The top of the cylinder has two camshafts that are responsible for opening and closing the intake and exhaust valves.

The VVT is a variable timing valve system. The intake air volume is adjusted by adjusting the valve opening, which is characterized by stable combustion, reduced fuel consumption, and improved emissions of hydrocarbons and nitrogen oxides.

The so-called valve timing is the moment when the valve is opened and closed. Theoretically, in the intake stroke, when the piston moves from the top dead center to the bottom dead center, the intake valve opens and the exhaust valve closes; in the exhaust stroke, when the piston moves from the bottom dead center to the top dead center, the intake valve Close and the exhaust valve opens.

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