Re: more details sbc in place of lt1

["Bruce Plecan" <nacelp@bright.net>]

Some appls. for individual cylinder timing corrections for Knock.
Measuring differences in crank accleration rates, for matching cylinder to
knock.
Heard a rumor once that it was a lead in to a system where timing was for
peak cylinder pressure, and recovery measing accleration rates after TDC.
But that went silent a year or so ago.

Well the lenghts of signals on the lo res vary, andyou have too sync that to
crank posistion.  The PLL would be for when actually running as I see, it
sense the rpm are so erratic at cranking.
Grumpy


> >Well, with a little electrical wizardry you could do a crank hub
monitoring
> >sensor to simulate the 8 (IIRC) pulses per rev of the lo-res Opti pulse,
and
> >then some sort of black box trickery to 'create' the high-res opti pulses
> >based on those lo res pulses. Essentially what the Electromotive LT1 SDI
> >(which is no longer available) did, right Roger? Perhaps 9 holes drilled
in
> >the crank hub - 8 at every 45 degrees, adding one at an odd spot so that
> >it's "keyed", with a small magnet inside each hole, and a hall effect
sensor
> >mounted to the timing chain cover to detect them as they go by...
> Yes, this sounds like a perfect application for a Phased-Lock Poop, err
> I mean Loop (dang, when ARE those meds gonna kick in).
> What zactly WAS the public rationale for the hi-res in that system
> anyway? Did they really tout it's technical ability to speedily adapt to
> adjust cyl-to-cyl timing changes? Or was it just an engineering or
> management team gone mad?
> Garpuzzled


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