Camselector Version 1.0
Camshaft selection
Tyre
12"
13"
14"
15"
16"
17"
18"
19"
155
165
175
185
195
205
215
225
235
245
255
265
285
295
80
75
70
65
60
55
50
45
40
35
30
Gear ratio
Axle ratio
Inlet valve
mm
bore
stroke
cylinders
4
5
6
8
10
12
desired powerband
idle-3500
idle-4000
1000-4500
1500-5000
2000-5500
2500-6000
3000-6500
3500-7000
4000-7500
compression ratio
7.5-8.0
8.0-8.5
8.5-9.0
9.0-9.5
9.5-10.0
10.0-10.5
10.5-11.0
11.0-11.5
Combustion chamber
Wedge / Bathtub shaped
Bowl in piston
Hemispherical
Four valve pent-roof
Car weight
500-750 kg
750-1000 kg
1000-1250 kg
1250-1500 kg
1500-1750 kg
1750-2000 kg
2000-3000 kg
Optimise in rpm band for
Torque +wider rpm band
Torque++ Power+ slightly wider band
Torque & Power
Torque+ Power++ slightly narrower band
Power & narrower rpm band
All out power & narrow rpm band
Valve drive
Pushrod
Single overhead cam
Double overhead cam
For more info on the various variables involved see
Camshaft page 2
Tuning..The basics
The exhaust
The inlet
The camshaft 1
The camshaft 2
The camshaft 3
Increasing engine capacity 1
Increasing engine capacity 2
Increasing engine capacity 3
©
briene@worldonline.nl
July 2001 camselector.html
