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The Honda CBX Engine By: MAE 388 Design Team 5 A.Kerner, T.Doehner, J.Doyle, N.Karas

The Honda CBX Engine By: MAE 388 Design Team 5 A.Kerner, T.Doehner, J.Doyle, N.Karas Model Year: 1979. Key Advantages. Double-overhead cams power 24 valves which feed the motor through constant velocity carburetors

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The Honda CBX Engine By: MAE 388 Design Team 5 A.Kerner, T.Doehner, J.Doyle, N.Karas

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  1. The Honda CBX Engine By: MAE 388 Design Team 5 A.Kerner, T.Doehner, J.Doyle, N.Karas Model Year: 1979

  2. Key Advantages • Double-overhead cams power 24 valves which feed the motor through constant velocity carburetors • Only two inches wider than the four cylinder Honda CB750 it replaced, boasting a 5-speed gearbox and svelte clutch • Produces 105 HP (76.6 kW) at 9,000 rpm. For a 500 lb bike, the power generation is rather remarkable • If today’s sports cars possess a 10:1 weight-to-HP ratio, then the Honda CBX has a 5:1 weight-to-HP ratio; for 27 year-old technology, this is quite impressive • First motorcycle engine to boast six cylinder inline configuration, which allows for the bike frame’s size to be smaller as opposed to having a V-6 cylinder configuration • 6-cylinder configuration allows for a higher top end speed, horsepower and smoothness than previous inline configurations

  3. Key Disadvantages • Too many moving parts • Extremely expensive to maintain and is rather heavy • Carburetors were very hard to maintain properly

  4. Key Features • There are two individual gears located in the engine’s top center which govern the air intake/exhaust ports:

  5. Piston Firing Order • The firing sequence for the pistons is: 1,5,3,6,2,4 which leads to maximum power generation per stroke:

  6. Valve Train • The Honda CBX valve train is very unique in that it guides valves that can be opened/closed dynamically, thus maximizing power output and fuel consumption based on operating conditions

  7. Overall Engine Setup

  8. Disassembly of Engine Setup

  9. Future Improvements & Considerations • Overall weight reduction, which would directly lead to a more optimal weight-to-HP ratio • Provide more engine torque by reducing the carburettor size • Electronic ignition

  10. References • www.honda.com • www.bikez.com • www.cbxworld.com • www.chuckhawks.com

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