IAME Parilla Leopard TaG Series - Choice of the Best Sprocket Ratio

MAN048ING32
An excessively cold spark plug shows the
symptoms,listedaside.
ATTENTION:
Always use a colder than standard
sparkplugwithhotclimates.
§ Insulatorendandelectrodescoveredwithblack
shadysoot.
§ Ignitiondifficulties.
§ Note:awetoroilyelectrodecouldalsomean
anexcessivelyrichmixture.
COMPARISONTABLEBASEDON
THETHERMALDEGREE
HOT
BOSCH NGK CHAMPION
WO8CS BR9EG N54R
WO7CS BR10EG N52R
WO6CS BR11EG
COLD
16 CHOICEOFTHEBESTSPROCKETRATIO
Thelife of an enginedependsupon many factors but most of all uponthe speed at
whichtheengineisoperated.Ifanengineisnormallyoperatedatspeedshigherthan
what recommended by the manufacturer, the wears and stress of the various
components(conrods,rollercages,bearingsetc.)willbesuchastodrasticallyreduce
thelifeoftheengineitself.Itisthereforeextremelyimportantthattheuserrespectsthe
operatinglimitsimposedbythemanufacturer.
The operating limit for the Leopard engine is 17000 RPM and the RPM limiter is
calibratedatthisvalue.
ATTENTION:
Never exceed the above limit. No obligation of IAME exists in case the above
limitisexceed.
Incasetheuserwishestooptimizeonthetrackthesprocketratioinordertoachieve
the best possible performance, without abusing the engine, follow the under shown
recommendations.
Theenginesaresuppliedwitha10or11teethsprocket(pitch:7.775mm).
Table 1 shows the various ratios between the sprocket on the axle and the engine
sprocketgiventhedifferentaxlesprockets.