Posted by Bob M on March 13, 2008 at 10:12:04 from (151.190.254.108):
In Reply to: 12 valves? posted by Dan-IA on March 13, 2008 at 07:21:36:
No wierd gimmick. As pointed out below some current production Ford engines use a 3 valve head.
It's not exactly a new idea either. Back in the 70's the Honda CVCC engines used a 3 valve/cylinder setup. As I recall it had 2 different-sized intake valves. The larger ome admitted a relatively lean main mixture; the other admitted a small volume of a richer mixture. I presume this was done to reduce emissions.
And going back to the late the 1930's the IHC "gas start" diesels also employed a 3 valve arrangement. However on these engines a smaller 3rd valve was used only during starting to open up spark plug chamber and to lower the compression ratio.
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