The power any
engine produces is directly related to the amount of air–fuel mixture ignited
in the cylinder. Increasing displacement is a common method of increasing
engine power.
Turbo charging and supercharging also increase engine power, but these increase engine cost as well.
Adding more than two valves per cylinder permits more gas to flow into and out with greater velocity without excessive valve duration.
The maximum amount of gas moving through the opening area of a valve depends on the distance around the valve and the degree to which it lifts open.
More total area under is possible when two
smaller valves, rather than one larger valve,
are used at the same valve lift. Smaller
valves allow smooth low-speed operation.
Turbo charging and supercharging also increase engine power, but these increase engine cost as well.
Adding more than two valves per cylinder permits more gas to flow into and out with greater velocity without excessive valve duration.
The maximum amount of gas moving through the opening area of a valve depends on the distance around the valve and the degree to which it lifts open.
More total area under is possible when two
smaller valves, rather than one larger valve,
are used at the same valve lift. Smaller
valves allow smooth low-speed operation.
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