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2026. 6. 30. 작업

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what is difference between DOHC and SOHC?

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For those who don't know, SOHC and DOHC refer to the following: SOHC - Single Over Head Cam DOHC - Double Over Head Cam A cam refers to a "cam shaft" or the thing which goes bump in the night. The cam has a "bump" or "hump" in it which actuates the valves which allows air into and exhaust out of the cylinder of the engine at the correct time so the engine will run correctly. As for the configurations themselves, in SOHC configurations, the camshaft is placed on top of the head. Here is an example: The wheel at the right of the picture is what the cam belt rides on. This wheel is attached to the cam itself. The cam, then actuates the rocker arms which you can see are pointing to either side of the head. This is an example of a 3-valve per cylinder head (2-intake and 1-exhaust per cylinder). The 2-valve per cylinder is a much mor prevalent configuration. Here is an example of a DOHC: In this example, you can see there are two separate cam shafts riding atop the head. For DOHC heads, the