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Formulary Performance (indexed)


Variables, which determine the indexed performance


While the effective performance can be measured on the clutch, the performance index (internal performance) is achieved by calculating the internal pressure. The average internal pressure takes into consideration only the losses caused by the three preparation strokes. Other losses, e.g., through the engine control, are not considered. Thus, the performance index shows the theoretically achievable performance under ideal conditions and for this reason,is always higher than the measured performance.

Two-stroke engine

Four-stroke engine

      VH·pi ·n
Pi=
        600.000

      VH·pi·n
Pi=
      1.200.000

       Pi·600.000
VH=
        n·pi

        Pi·1.200.000
VH=
          n·pi

      Pi·600.000
pi=
        n·VH

       Pi·1.200.000
pi=
          n·VH

     Pi·600.000
n=
      pi·VH

    Pi·1.200.000
n=
        pi·VH

Check your calculation!     You need help?
Please enter numbers only in three of the four fields!
VH Total displacement mm³ cm³ dm³ (liter)
n RPM (engine) 1/min
pi Pressure
(mean ind.) 		bar
Pi Performance (indexed) kW
Engine: Two-stroke Four-stroke
Places behind the comma: 2 3 4 5


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Translator: Don Leslie - Email: lesdon@t-online.de

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