Quote:
Originally Posted by cawimmer430  3-valve technology allowed the catalytic converter to reach its optimum operating efficiency temperature 12 seconds earlier than in a 4-valve design, hence less emissions. That's the reason MB went with 3-valve technology. The addittion of twin spark plugs per combustion chamber had the added benefit of a cleaner combustion yielding more torque and decreasing fuel consumption. 
I got this information from one of my many Mercedes-Benz Bibles at home.  |
True that the goal was for emission purpose. (and nice diagram by the way...is there a English version of the book?)
Just that when I drive with the 3.2 litre "3-valver", it feels more like a Japanese engine, sans the Saxonic feel.