Rotax RM1 Benutzerhandbuch Seite 120

6.1.2. Exhaust valve adjustment
For an engine with closed exhaust valve (performance curve 1) and open exhaust valve
(performance curve 2) there are 2 different characteristic curve results (Diagram 2). The optimum
performance characteristics of the engine is 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 lose performance and in consequence 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 loose acceleration 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 gives less performance, and you loose acceleration potential.
The engine reaches maximum performance even with the exhaust valve wrongly adjusted, but you
loose performance and thus 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 120/132
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Leistungsverlust bei falschem Schieberöffnungspunkt
Performance loss at wrong exhaust valve timing
optimaler Schieberöffnungs-
zeitpunkt / optimum valve
opening point
Schieber öffnet zu
früht / valve opens
too early
Schieber öffnet zu
spät / valve opens
Motordrehzahl [1/min.], engine revolutions [rpm]
ROTAX KART RM1
manuals search engine
Operator`s Manual RM1
too late
Leistungskurve 2
performance curve 2
Ausgabe/Edition 01/2006