Basics

The Upper RPM Limit of an Engine’s Designed Operating Range
Above this Engine Damage becomes more and more likely
In Reciprocating Internal Combustion Engines challenges particularly emerge with:
- G-forces / shock in the Piston + Valve Train
- Time for Fuel Atomization / (Complete) Combustion
- Heat Rejection Capacity (Cooling may be sufficient at “normal” operating conditions, but woefully inadequate at 10x the same RPM etc)
  - Math or Computer Model means of predicting this for Radiator Sizing is something to look into
- Vibration/Resonance
To an extent “High Reving” capability, Reliability, and Cost are also tied in a bit of an Iron Triangle (re: Engine Design Tradeoffs )

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