Date registered: Dec 1998
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Re: Why do most Mercedes have 3 valves per cylinder?
Yes, it is two intake and one exhaust. This has only been around in the last few years. I think it was 98 or 99. Before that is was DOHC 4V. Now it is SOHC 3V. The 3 valves make room for two spark plugs per cylinder. They say that the two plugs give better and more complete combustion (better emissions and mileage), the three valves and one cam/cyl bank offer less valve train complication, size and weight. I'm sure there are more little tidbits, but I think that is te gist of it.