University of New Hampshire

Clean Snowmobile Challenge 2006

Overview Target market Power plant selection Drive train Power output Emission reductions Noise reductions Costs Estimated retail costs Conclusion

Target Market

Recreational enthusiasts Rider priorities

Performance Environmental considerations Noise reduction

Power Plant Selection CBR 600 F4i

Four stroke (lower emissions)

Four cylinder, liquid cooled

Throttle body fuel injection

Exhaust air injection 3-D ignition mapping High revving

Drive Train Internal gear

reductions Off crank

1.822:1 Transmission

modifications .8:1

External gear drive Final gear ratio:

1.45:1 Output shaft RPM

Jack shaft

Power Output

123 hp, 72 ft-lbs @ 8950 RPM (clutch)Horsepower vs RPM

0

20

40

60

80

100

120

140

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Shaft RPM

Hors

epow

er Horsepow er

Torque vs RPM

0

10

20

30

40

50

60

70

80

0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000

Shaft RPM

Torq

ue (f

t-lb)

Torque True

Reduced Emissions

Four stroke Low emissions California model

CBR 600 F4i with catalytic converter

Exhaust air injection Engine/exhaust system passes

2004 CARB emissions standards

Noise Reduction

Under hood sound insulation (Accumat)

Under seat exhaust Stock CBR 600 silencer, 80 dB

rating Designed specifically for motor

Fiber Frax exhaust insulation

Costs

Estimated Retail Cost

Late model chassis: ~ $4000 CBR 600 F4i motor: ~ $2000 Hardware: ~ $188 Exhaust: ~$550 Total production cost: ~ $6738

Conclusions Produced high performance machine

Fast acceleration 90+ mph top speed

Lower emissions than standard 2 stroke

Smoke free Majority of time spent integrating

motor into chassis

Questions