Rotax 125 MAX DD2 Einbauhinweise Und Betriebsanleitung Seite 83

Motorleistung [kW],
performance of engine [kW]
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Note:
If the r.p.m. range from 9.200 to 12.200 r.p.m. is not sufficient due to a particular track shape
(extremely long straight) the maximum engine speed of 13.600 r.p.m. should be aimed for.
Note:
The acceleration potential between 9.200 and 12.200 r.p.m. is essentially higher than between
12.200 and 13.600 r.p.m. Therefore it does not always make sense to use this r.p.m. range (high
top speed on a straight) and to leave the acceleration potential of the lower r.p.m. range (out of
sharp corners) unused.
This should only be a hint. The optimum choice can only be found at exact knowledge of the race
track.
For an approach or optimization of the reduction gear ratio the Charts 2 and 3 should be helpful.
The optimization procedure for the reduction gear ratio for a new race track is explained step by
step by the following example:
Now you must decide on the following criteria whether a shorter or longer gear ratio is necessary:
Seite/page 83/100
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Operating Instructions 125 MAX DD2
großes Beschleunigungspotential
high acceleration potential
Motordrehzahl [1/min.], engine revolutions [rpm]
Diagram 2
The maximum speed is limited at 13.800 r.p.m. by an electronic r.p.m. limiter.
A basic requirement for the full use of the speed range between 12.200 to 13.600
r.p.m. is optimized carburetor jetting (see chapter 4.1. Carburetor calibration).
Start with the standard gear ratio (35/62, equivalent to 12/90 at 1
nd
2 gear).
manuals search engine
Leistungskurve,
performance graph
Kurve des Fahrwiderstandes,
graph of driving resistance
st
gear and 14/79 at
Ausgabe/edition 01/2006