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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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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