Road Racing FIM Superbike & Supersport World Championships
Road Racing FIM Superbike & Supersport World Championships
Road Racing FIM Superbike & Supersport World Championships
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2.11.5 The RPM depends upon the mean piston speed corresponding to<br />
the stroke of the engine.<br />
The RPM will be given by the relationship:<br />
N =<br />
30,000 x cm<br />
l<br />
in which: N = prescribed RPM of engine<br />
cm = fixed mean piston speed in m/s<br />
l = stroke in mm<br />
2.11.6 Noise control<br />
Due to the similarity of the piston stroke in different engine configurations within the<br />
capacity classes, the noise test will be conducted at a fixed RPM. For reference<br />
only, the mean piston speed at which the noise test is conducted is calculated at<br />
11 m/sec.<br />
2 cylinders 3 cylinders 4 cylinders<br />
600cc 5,500 RPM 6,500 RPM 7,000 RPM<br />
750cc 5,500 RPM 6,000 RPM 7,000 RPM<br />
over 750cc 5,000 RPM 5,000 RPM 5,500 RPM<br />
2.11.7 The maximum sound level for engines with more than one cylinder<br />
will be measured on each exhaust end.<br />
2.11.8 A motorcycle which does not comply with the maximum sound limits<br />
may be presented several times at pre-race control.<br />
2.11.9 The surrounding sound must not exceed 90 dB/A within a 5 metres<br />
radius from the power source during tests.<br />
2.11.10 Apparatus for noise control must be to international standard IEC<br />
651, Type 1.<br />
The sound level meter must be equipped with a calibrator for control and<br />
adjustment of the meter during periods of use.<br />
2.11.11 The “slow response” setting must always be used.<br />
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