IAME Parilla Leopard RL - Page 35

MAN048ING33
Sprocket
ratio
Teethn°Enginesprocket
Sprocket
ratio
Teehtn°Enginesprocket
Teethn°
axlesprocket
10 11 Teethn°
axlesprocket
10 11
72 7,20 6,55 83 8,30 7,55
73 7,30 6,64 84 8,40 7,64
74 7,40 6,73 85 8,50 7,73
75 7,50 6,82 86 8,60 7,82
76 7,60 6,91 87 8,70 7,91
77 7,70 7,00 88 8,80 8,00
78 7,80 7,09 89 8,90 8,09
79 7,90 7,18 90 9,00 8,18
80 8,00 7,27 91 9,10 8,27
81 8,10 7,36 92 9,20 8,36
82 8,20 7,45
Fortheoperationlimitof16500RPM thefollowingtable(Tab.2)hasbeenprepared.
SUGGESTION:
§ During the track tests we recommend use of a tachometer recording the max
obtainedengineRPM.
§ Use sparkplug caps with a resistance of 5KΩ 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.
§ Fromtable1withZ=10as enginesprocketandZ=72ontheaxle sprocket,aratio of
7.20isfound.
§ Make a few laps on the track and, let us assume that you read 14.000 max engine
RPM.
§ Fromthetable2toachieveamaxRPMof16500RPM(operatinglimitfortheLeopard
engine)asprocketratio from8.37 and 8.60shouldbeused(havingused,duringthe
tests,asprocketratioof7.2andhavingachieved14.000RPMmax.).
§ Fromtable.1,withthesevalues, a sprocketratio of10:84 /10:86should be used or,
havingaZ=11ontheenginesprocket,aratio11:92shouldbeused.
Tab.1