It shows the motion of the camshaft on top of the engine and how the valves interact with the pistons. This little animation is an outstanding DOHC engine diagram. It’s a real-world technology that’s important to understand, especially if you’re buying an engine. So, DOHC isn’t just an advertising gimmick. The end result is that modern DOHC engines typically achieve greater efficiency, better economy and also make more power than Single Overhead Camshaft (SOHC) motors or their pushrod predecessors. Using two camshafts to actuate the rotation of the valves allows engine builders to control the intake and exhaust valves separately, instead of other arrangements with only one camshaft that lack that precision.īy taking control of the exhaust and intake valves independently, this arrangement offers engineers greater control over the fuel consumption of the engine and the exhaust flow created by combustion. The energy created by combustion in the cylinders yields the power that turns the wheels and drives the car, as well as hot exhaust gasses that must escape the cylinders and flow out of the car.Īccordingly, engines have a series of valves that control the flow of the intake and exhaust. Motors have an engine block, housing the cylinders where internal combustion happens.Ī mix of fuel and air feeds that process, and combustion occurs when a spark ignites the mixtures. We have to talk about some engine basics to understand what that means. You first have to know that DOHC stands for Dual Overhead Camshaft. But what does it mean when you notice the DOHC emblem or insignia on a vehicle or when listed on the spec sheet for a particular engine? DOHC Engine Advantages and DisadvantagesĬarmakers use combinations of letters to denote their unique models, advanced systems like Electronic Stability Control (ESC), and sometimes even the name of their company.
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