Have been involved in some interesting reading about number of valves and the advantages/disadvantages, with some relevance to Mercedes and their use of 3 valves in the newer engines.

http://www.pistonheads.com/gassing/topic.asp?h=0&f=23&t=139948


Read the long post by 'Marquis rex' about 10 posts in (may be on page 2).

Russ

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg