Single Overhead Cam (SOHC) engines utilize a single camshaft located in the cylinder head to actuate both intake and exhaust valves. This configuration is the standard architecture for the majority of Honda D-series engines.

Operational Overview#

In an SOHC design, the camshaft is driven by the crankshaft via a timing belt or chain. As the camshaft rotates, the lobes directly actuate the valve train—typically through rocker arms—to manage the intake of air-fuel mixture and the expulsion of exhaust gases.

Note

Unlike DOHC (Double Overhead Cam) configurations, which utilize separate camshafts for intake and exhaust valves, the SOHC design prioritizes mechanical simplicity and reduced cylinder head mass.

Key Characteristics#

• Valve Actuation: A single camshaft controls both intake and exhaust cycles.
• Application: Primarily found in Honda D-series engines.
• Maintenance: Generally offers easier access for timing belt service and valve clearance adjustments compared to DOHC variants.

Comparison#

See also: DOHC0