Continuous RPM vs. Intermittent in a piston engine.
This is a question relating to piston engines in a car but have seen a similar phrase in a POH.
In the Manual 6800rpm is stated as the maximum continuous but allows up to 7200 intermittent (does not specify time though).
Why is this? I understand it to mean that heat dissipation is the reason as the reciprocal parts should be able to spin all day long at those rpm's, otherwise they'd fail anyway above 6800 (either that or bearing pickup would occur).
FYI it's a 2 litre 16v 4cyl. 86mm x 86mm.
It's just a curiosity question
Shaft