Well, this cylinder head houses the cams that operate the valves. These are the cylindrical rods with a varied number of lobes at different angles. Usually, it is the crankshaft that drives the cams. Now, what are valves you may ask?
Detailed Fact: In a 2 valve per cylinder setup, the Intake is bigger than the exhaust port. Again in a 4 valve head, the intake ports are bigger than the exhaust ports. So, these cams operate the opening and the closing of the valves depending upon the stroke of the engine. This goes even deeper but not getting into the detail, there can be just one cam or at times 2, depending upon the design.
As the name suggests, SOHC is a single cam that controls the opening and closing of the valves. Usually, a single-cam can operate either 2 or at max 3 valves efficiently sometimes 4 valves can also be operated via a single-cam but the values are quite restricted. Well, DOHC is short for dual overhead cam and the is one of the advanced and prominent cam mechanism used in the engines.
These two cams are capable of operating 4 valves per head with ease by offering a wide range of customisations. The 5th Gen Honda City comes with dual overhead cams. Sure, both of them have some major points up their sleeves. I have given your blog link on my blog. This site uses Akismet to reduce spam. Learn how your comment data is processed. A DOHC, four valves per cylinder configuration allows better airflow at high engine speeds, resulting in better top end power. DOHC engines also allow the spark plug to be placed right in the middle of the combustion chamber which in turn promotes efficient combustion.
The disadvantage of such a setup is more weight, higher costs and also the fact that driving two camshafts requires more components. To sum it up, a 4 Valve per cylinder SOHC engine with a lighter valvetrain mass would have better performance characteristics at the lower end of the powerband.
However, at higher engine speeds, a DOHC setup with its higher valvetrain mass and as many valves per cylinder will develop higher peak torque and horsepower. You can also check out our extensive blog on disc brakes for deeper insights. Home Media Blog Blog.
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A SOHC engine contains much lesser parts, which will make it more reliable. DOHC engine is much more efficient, and you will get more power output from the engine. A DOHC engine will therefore also have better fuel consumption because of the efficiency.
The SOHC engine is a good engine type, but it depends on what you are looking for. If you are looking for a reliable engine, the SOHC is a good engine for you. If you are looking for performance and good fuel consumption, DOHC is a better choice. The easiest way is to check the specifications of your car repair manual or something similar. You can often also check the width of the engine cylinder. If it is wide, there are probably two camshafts, and if it is too narrow to contain two camshafts — you have a SOHC engine.
Ask any car question in our new community! Magnus is the owner and main author of MechanicBase. He has been working as a mechanic for over 10 years, and the majority of them specialized in advanced diagnostics and troubleshooting. Certified Automotive Diagnostic Technician. With Dohc you're eitther expecting a total engine rebuild or a new engine. Which is faster? I want to replace my Mercedes engine with its successor OM My reason being I want more speed n less noise.
Very helpful keep up with passing on your knowledge it forsure gets us people getting what we need to know to be successful and correctly provide descriptions of how it all operates as simple as it gets.
No amount of "thank yous" could ever mean how truly grateful i am for pages like this and people that care enough to make it a little easier for beginner mechanics and gear heads or just simply getting another take from 1 to another experienced car enthusiast. SOHC engine. DOHC engine.
Fuel Efficiency.
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