Rotax RM 1 Benutzerhandbuch Seite 123

6.1.2. Exhaust valve adjustment
For the engine with closed exhaust valve (performance curve 1) and open exhaust valve
(performance curve 2) there are 2 different characteristic curves (Diagram 2). The optimum
performance characteristics of the engine are achieved when the opening timing of the exhaust
valve is at the intersection of the 2 performance curves.
The diagram depicts the situation for better understanding.
With wrongly adjusted exhaust valve you renounce of performance and in consequence of
acceleration potential (Diagram 2 – gray resp. hatched zone).
If the exhaust valve opens too soon, the engine acts as per performance curve 2 (for open exhaust
valve) which gives less performance at this r.p.m. range, and you renounce of performance
potential.
If the exhaust valve opens too late, the engine acts as per performance curve 1 (for closed exhaust
valve) which at this r.p.m. range already gives less performance, and you renounce of performance
potential.
The engine reaches its maximum performance also with exhaust valve wrongly adjusted, but you
renounce of some of the performance and in consequence acceleration potential.
Motorleistung [kW],
performance of engine [kW]
26
24
22
20
18
16
14
12
Leistungskurve 1
10
performance curve 1
8
6
4
2
0
Diagram 2
Seite/page 123/132
Operator`s Manual RM1
Leistungsverlust bei falschem Schieberöffnungspunkt
Performance loss at wrong exhaust valve timing
optimaler Schieberöffnungs-
zeitpunkt / optimum valve
opening point
Schieber öffnet zu
früh / valve opens
too early
Schieber öffnet zu
spät / valve opens
too late
Motordrehzahl [1/min.], engine revolutions [rpm]
ROTAX KART RM1
Leistungskurve 2
performance curve 2
Ausgabe/Edition 05/2003