the examples in the above post seem perversely chosen to have a common piston speed - to suggest what ?
the HB V8s low piston acceleration shows it's able to reciprocate much faster than 13000 rpm (given pneumatic valves etc)
that's how the series VI first peaked at 13500 rpm, then 14000 rpm
ACRO wrote: ↑
Sat May 25, 2019 8:56 pm
...a larger stroke physically helps in midrange torque but limits top end power since piston speeds vs material strenght set a limitation on this . ilmor did a trick with berrylium so it appers ( but not confirmed ) they since 1998 always ran smaller bore / bigger stroke than other top teams and had better midrange torque but thanks to pistons out of berrylium they nevertheless were able to run the same rpms and power levels like e.g ferrari . 2001 they were doomed with this concept and the prohibition of berrylium ....
well yes but ....
force is proportional to piston acceleration not to piston speed
ie safe rpm is (inversely) proportional to square root of stroke not to stroke
piston speed isn't a hard limit on engine rpm - but piston acceleration is