Quote:
Originally Posted by layback40
Having the 2 signals you could probably calculate a type of centane number.
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You most certainly could get a type of real world working cetane number.
It would probably be quite a good indication for low engine rpms as the delay in transmission time of ignition from the cylinder to pre-chamber (in an OM61X engine) would probably be (at a guess) small in comparison with the time between the delivery pulse and the ignition pulse (as pictured in my wildly imaginative sketch above!). At higher engine speeds your transmission time will get closer to the distance in time between the pulses - also you're gonna need to pretty nice transducers...
I'm not sure if it would provide a realistic relationship with the cetane number on the can (so to speak) as the OM617 isn't a standardised test engine
(Further reading for those who are interested =>
Cetane number - Wikipedia, the free encyclopedia)