HONDA CR750
Joep Kortekaas' Honda 750 CR kitted race bike
Engine Analysis
Warning: (this is quite a graphic and table intensive page to load,; but worth the wait)
Original situation |
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Power |
67 |
hp |
Piston speed |
17.9 |
m/s |
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@ engine speed |
8500 |
rpm |
Pme |
9.6 |
barg |
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Bore |
61 |
mm |
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Stroke |
63 |
mm |
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After tuning |
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Pme |
12 |
barg |
Power (crankshaft) |
95.8 |
hp |
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Power (rear wheel) |
81.4 |
hp |
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Specific power |
128.0 |
hp/l |
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Power per cm2 piston area |
0.81 |
hp |
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Power per kg |
0.42 |
hp/kg |
rpm |
4000 |
5000 |
6000 |
7000 |
8000 |
9000 |
10000 |
11000 |
Piston speed |
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Cm |
8.4 |
10.5 |
12.6 |
14.7 |
16.8 |
18.9 |
21.0 |
23.1 |
Cm.corr. |
8.3 |
10.4 |
12.4 |
14.5 |
16.6 |
18.7 |
20.7 |
22.8 |
Inlet length |
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Inertia |
1,337 |
856 |
594 |
437 |
334 |
264 |
214 |
177 |
Pulsation |
553 |
440 |
365 |
311 |
271 |
240 |
215 |
195 |
Exhaust length |
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L for q=6 |
1267 |
1013 |
844 |
724 |
633 |
563 |
507 |
461 |
Calculation of piston speed, inlet length and exhaust length |
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Motor Power Inlet System Exhaust System Friction and Drag
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Copyright: Murray Barnard/Joep Kortekaas - 1999