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)

Motor    Power    Inlet System    Exhaust System     Friction and Drag

Restoration Process     Photo Gallery    Joep Koortekaas Page

 

POWER

Original situation

Power

67

hp

Piston speed

17.9

m/s

@ engine speed

8500

rpm

Pme

9.6

barg

Bore

61

mm

Stroke

63

mm

After tuning

Pme

12

barg

Power (crankshaft)

95.8

hp

Power (rear wheel)

81.4

hp

Specific power

128.0

hp/l

Power per cm2 piston area

0.81

hp

Power per kg

0.42

hp/kg

wpeE.jpg (37808 bytes)

wpeF.jpg (17386 bytes)

 

rpm

4000

5000

6000

7000

8000

9000

10000

11000

Piston speed

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

Inertia

1,337

856

594

437

334

264

214

177

Pulsation

553

440

365

311

271

240

215

195

Exhaust length

L for q=6

1267

1013

844

724

633

563

507

461

Calculation of piston speed, inlet length and exhaust length

 

Motor    Power    Inlet System    Exhaust System     Friction and Drag

Restoration Process

Photo Gallery

Joep Koortekaas Page

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Copyright: Murray Barnard/Joep Kortekaas - 1999