7747 spark control questions.

[Bruce Plecan]

There was another devise similiar in concept for measuring torque.
Used two sensors, and measured the crankshaft *twist* and then the torque
could be calculated
Bruce


> All this talk about "actual" delivered spark advance timing, sparks (sorry
> about the pun) me to relay the following and ask a simple question in
> return..........
>
> Buried in my file cabinet  (upstairs, far from the wine cellar and
> computer),  I have a flyer and an article that described what I thought
was
> an ingenious instrument at the time.  All of this is probably 7-9 years
old.
> This instrument would measure the actual spark advance of an engine, based
> upon the location of a magnet positioned circumferentially on the harmonic
> balancer, and displayed that value as a simple two digit signed read-out
on
> a round faced red LED.  A driver could either focus on the LED numbers as
> they happened, or data log things for post analysis.
>
> By the time I got around to inquiring about it, the inventor/manufacturer
> had plunged into seriously bad health.  I had a chance to speak to him
> briefly about it over the phone, but when I called back a couple of weeks
> later to order one I was informed that he had passed away and that the
> product would no longer be produced/sold.
>
> I know it's dirt simple to use a PC based O-Scope to do the same (I have
one
> here that I use), or even a DAQ system, **BUT**, I think it would be
really
> cool to have a dedicated spark advance "gage" mounted in the cockpit so as
> to be able to read/observe where SA is really at without having to drag
out
> the laptop each time.  Is this something that a DIY'er could reproduce,
> and/or does anyone have a lead as to where this thing may have left-off?
> Thought it was a neat idea at the time for CAL'ing and diagnosing, that's
> all.  If it was available today, I'd probably order two or three..........
>
>
> Walt.
>
> If anyone's interested, I can dig-up the flyer, as well as the guy's name.
>
>
>
>
>
> >
> > > > 0 degrees as per the timing decal. If Bias warm is 10 deg. Bias
> > > > cold is 20 deg (I think). Winbin table for 50 Kpa @ 600 rpm is 29.88
> deg
> > > > whereas
> > > > Tunercat is 20.1 degrees BTDC. (Using an ARJT as an example).
> > > > Winbin adds 10 deg or includes the bias--TC doesn't add it-- so
what's
> > the
> > > > actual "engine" measured timing value at 50Kpa and 600 RPM ?
> >
> > Winbin is showing the actual amount of timing in the table which the
bias
> is
> > subtracted from.
> > TC subtracts the bias from the main table so what you see is what the
dist
> > will put out assuming what your dist is set to matches the intial timing
> set
> > in the prom in this case 0. In the above case, 29.88 is what is actually
> in
> > the main table with out accounting for the bias, 20.1 is what the
"actual"
> > timing will be set to and includes the bias.
> >
> > Kevin R
> >
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from gmecm, send "unsubscribe gmecm" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org