Re: [Amc-list] TBI fuel injection tuning...

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: Frank Swygert <farna@xxxxxxx>
" 
" "Lost spark" systems are typically used on motorcycles. My 1980 Suzuki
" GS1000G has two coils, two plug wires each. The cylinder with the
" compression and mixture hogs the fire, just as you surmised, and the
" one on the exhaust stroke gets a weak fire. If the carb is really out
" of adjustment, has a stuck float or something in that order, it makes
" for a great back fire though! That seldom happens, as there is rarely
" enough oxygen left in the exhaust to allow an explosion. 

those plugs must effectively be in series though.  as tom says, one
would hog the spark if they were in parallel.

if the fuel/air mix is insulating, spark voltage would climb along
with compression.  conversely, if the hot exhaust is at all conductive
spark voltage there would drop.  i don't know if either conjecture is
true, but if they are the exhaust plug would always fire first and hog
the spark if in parallel but present only a minor additional voltage
to the coil if in series.

i vaguely recall that the first dis setup for saab had only 2 coils
for 4 cylinders.

" ----------
" From: Tom Jennings <tomj@xxxxxxx>
" 
" > > That would be very wild if you went with six coils to do individual  plugs.
" > > All those coils mounted in a row.
" > > Old style oil filled look coils of course.
" > > To get two plugs per coil you'd have to go to some high tech "modern" coil, ewe, groaty...
" >   
" 
" Nahh, just splice two plug wires into one coil -- as soon as I typed 
" that, I realized that one plug will spark first (microseconds) and hog 
" all the current, then the other cyl won't fire. Better RTFM on this!
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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