| 摘要 |
An internal combustion engine is provided with an exhaust discharge system providing merging exhaust paths for discharging exhaust from individual cylinders into an exhaust cavity. A diverter valve is provided for selectively preventing merger of the exhaust from the individual cylinders prior to discharge, and an exhaust passage receives such diverted exhaust for discharge into the exhaust cavity. The diverter valve operates to divert exhaust at low speed operation, which provides satisfactory low speed exhaust tuning. The diverter valve is closed at high speed operation to allow the exhaust from the individual cylinders to merge prior to discharge, which provides satisfactory high speed exhaust tuning. The invention provides satisfactory exhaust tuning at both high speed and low speed operation, which heretofore had not been possible, to increase overall engine performance and power.
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