21
MAN-88 – UK
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Use spark plug caps with a resistance of 5K
Ω
to avoid eventual interferences
between the engine ignition and the tachometer and/or telemetry.
The following example should clarify the procedure for the optimization of the sprocket.
Assume to use the engine with Z=10 teeth engine sprocket and that during the preliminary
track tests a Z=72 teeth axle sprocket has been used.
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From table 1 with Z=10 as engine sprocket and Z=72 on the axle sprocket, a ratio of 7.20 is
found.
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Make a few laps on the track and, let us assume that you read 11.000 max engine RPM.
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From the table 2 to achieve a max RPM of 12.500 RPM (operating limit for the Gazelle
engine) a sprocket ratio from 8.08 and 8.31should be used (having used, during the tests,
a sprocket ratio of 7.2 and having achieved 11.000 RPM max.)
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From table.1 , with these values, a sprocket ratio of 10:81 / 10:83 should be used or, having
a Z=11 on the engine sprocket, a ratio 11:90 should be used.
Sprocket ratio to achieve max. 12.500 RPM
Sprocket ratio used during test
Engine max.
RPM during
tests
