| 摘要 |
<p>An intake and exhaust system that uses two intake valves (14) and one exhaust valve (16) for each engine combustion chamber (12) spaced around the cylinder centerline in the cylinder head (10). One or more spark plugs (18) or other ignition devices are provided in the head (10) on the cylinder centerline and/or between pairs of adjacent valves. Preferably, the ratio of exhaust valve diameter to intake valve diameter is from about 0.95:1 to 1:1.2. A substantially hemispheric depression may be provided for each valve (14, 16). Squish areas are preferably provided around the periphery of combustion chamber (12).</p> |
