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Old 06-28-1999, 12:46 PM
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I know this probably came up before but I was wondering if someone could describe the real + and - of SOHC vs DOHC. I've heard that SOHC because they use rocker arms aren't as good as DOHC. I didn't understand at all.
Why would mercedes go to SOHC?

Old 06-28-1999, 08:35 PM
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Join Date: Mar 1999
Location: Atlanta, Georgia, USA
Posts: 1,342
The SOHC valvetrain of the M103 generation engines and the SOHC valvetrain of the new twin-plug/3-vavle are totally different. The new engine has 3 valves per cyl. Two intake and one exhaust. They use the extra room to add a second spark plug. The twin-plug ignition gives a much cleaner burn than the older engine families. This means better "power-per-gallon" and less emissions. All the new engines have a trick intake that helps the torque characteristics immensely. I answered a similar question in regarding new vs old in another forum. The latest SOHC engines don't quite make the power of the previous DOHC engines but they do weigh less so there is a positive power-to-weight improvement. Give article a look and if you have any more questions please post or email me.

Hope this helps...Lee

Old 06-28-1999, 08:37 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The engine mechanics are easier to build on the SOHC engine But the fuel managment system is more complex. So a cheaper engine w/expensive computer.


Old 06-29-1999, 12:04 PM
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Thank you very much for your input. I was wondering if you could go to
and also explain in more detail. This is a current discussion over there.

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