Cosworth V8 at 20,000rpm

F1 engine at 20,000rpm. Now against the rules as the limit is 19,000rpm.

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Ford Sierra Cosworth RS500 -
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Renault 3.0L V10 at 20,000 RPM
Renault 3.0L V10 between 16,000 and 20,000 RPM (Renault 2.4L V8 at 20,000 RPM Some say its a V10 but I can only count 8 injectors...)

Overhead Cam at 14K RPM
This video shows an operational cutaway of a BMW S1000RR — a 193HP superbike — bumping against its 14,200RPM redline. A cam and valvetrain at 118 cycles per second is an amazing sight (and sound)

Valvespring at 7000 RPM
Nascar engine from 7 years ago. 7000rpm with a .700 cam lift.