> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Jens M. Guessregen
> Sent: 16 February 2011 14:41
> To: 'Microcontroller discussion list - Public.'
> Subject: RE: [PIC] RPM measurement question
>=20
> "You can also "sanity-check" your data, knowing that the engine can't
> instantly change its speed by a large amount."
>=20
> Maybe this engine cannot, but others can.

If you are looking at the period between consecutive spark events, then
you shouldn't see a dramatic delta even in very high revving/low inertia
engines i.e. the engine isn't going to halve or double it's speed
between one spark and the next.

Regards

Mike

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