Difference

SOHC stands for Single Overhead Camshaft. That means that there is only one camshaft per header. Inline engines will contain one camshaft. V-type and/or flat will contain 2 camshafts. For a SOHC engine there are usually 2 valves per cylinder but there can be more with the addition of cams for each valve.

DOHC stands for Double Overhead Camshaft. Now there are 2 camshafts per header. So in an inline there are 2 camshafts because there is only one header, but there is 4 in a V-type or flat engine. These DOHC engines usually have 4 valves. One camshaft for the exhaust valves and the other for the intake valves.

Advantages to having a DOHC engine over a SOHC is that the engine has twice as many intake and exhaust valves as a SOHC motor. This makes the engine run cooler and more smoothly, quietly, and efficiently. But the downfall is that DOHC engines cost more for repairs. To ensure against expensive engine repairs, make sure you change your engine's timing belt about every 60,000 miles.

http://www.angelfire.com/hiphop3/ppddaiddddyy/SOHC.html

This little was gotten from a website out of my curiosity. Auto guru Lets hear from u base on Nigeria mentality about this engines.

santakris: Difference

SOHC stands for Single Overhead Camshaft. That means that there is only one camshaft per header. Inline engines will contain one camshaft. V-type and/or flat will contain 2 camshafts. For a SOHC engine there are usually 2 valves per cylinder but there can be more with the addition of cams for each valve.

DOHC stands for Double Overhead Camshaft. Now there are 2 camshafts per header. So in an inline there are 2 camshafts because there is only one header, but there is 4 in a V-type or flat engine. These DOHC engines usually have 4 valves. One camshaft for the exhaust valves and the other for the intake valves.

Advantages to having a DOHC engine over a SOHC is that the engine has twice as many intake and exhaust valves as a SOHC motor. This makes the engine run cooler and more smoothly, quietly, and efficiently. But the downfall is that DOHC engines cost more for repairs. To ensure against expensive engine repairs, make sure you change your engine's timing belt about every 60,000 miles.

http://www.angelfire.com/hiphop3/ppddaiddddyy/SOHC.html

This little was gotten from a website out of my curiosity. Auto guru Lets hear from u base on Nigeria mentality about this engines.

Good job.

Most automakers use timing chain. All Nissans and Infiniti use timing chains and it does not need to be changed. All their engines are DOHC.
U can get a lot of horsepower from a DOHC engine than a SOHC engine. E.G 94 Nissan maxima VG30e is a SOHC engine and displaces 160HP. Same displacement engine in a 2001 maxima VQ30DE displace 222hp. There are more tunings involved but u get the picture