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A 1996 Kawasaki ZX-6R motorcycle has been converted from a four-carburetor intake and non-load sensitive ignition to a programmable electronic fuel injection system for performance enhancement. Throttle response and power delivery are greatly affected by proper fuel and spark management. Quick throttle response and smooth power delivery are particularly important in motorcycle road-racing applications. In order to achieve this a programmable engine management system is necessary. Due to turbulent air flow phenomena the fuel requirements of an engine can oscillate throughout the engine speed range. These airflow efficiencies are dependant upon many items including intake size and shape, camshaft design, exhaust design, surface roughness of the intake and exhaust ports, etc. In order to achieve proper air/fuel ratios, relative to rider demand, the current setup is not optimal.

A prototype engine intake design incorporating a required 20-millimeter restrictor is currently being evaluated for the 2001 Formula SAE competition. The engine is a 600 Honda CBR F4 four stroke. This carbureted stock engine was converted to fuel injection, requiring complete intake redesign. The primary difference from the stock intake design is the use of dual plenums, which prevents charging losses due to overlapping intake valve events. The throttle body and venturi design have also been improved. Preliminary test results are presented to validate design calculations and indicate potential for improvements.