Quote:
Originally Posted by lumberjim
Why does my hemi have two plugs per cylinder?
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Part of making a 70 Hp/liter engine involved the swirling of fuel inside a cylinder. So that an ignited flame did not slam directly down on the piston. But instead swirled down. This even scoured and burned condensing fuel from cylinder sidewalls.
A best way to accomplish this used four valves per cylinder. Another technique was to trigger an ignition with multiple plugs. A technique also implemented in Wankels. Some designs would even stagger when plugs fired.
None of that is relevant to his spark plug inspection.