Paul Stewart wrote:
>
> Have just run the engine for the first time (914). All seems well with
> exception of rotax tacho. Advancing throttle from 'rough running' to
> just smooth, the tacho jumps from <2000rpm to 4000rpm - numbers which
> I just don't believe. Anyone got any thoughts?
>
> Unfortunately the rest of our engine instruments are a BMA EFIS1 which
> doesn't easily support an alternative tacho for the rotax.
the calibration seems to varie with the gap of the sense coil, I once
set clearance to the book, (912) above 4000 the reading was full scale.
Not good those Rotax tachos, we used a Grand Rapids EMI which was perfect.
Graham
|