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Bruce,
This is what I came up with on a v8 tbi setup
(such as '747):
3475 rpm @ 11.6 msec inj pulse.
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3475rpm / 60 = 57.91 rev's per sec
1 / 57.91 = 0.01726 sec's per rev, or 17.2 milli-sec per rev
v8 = 4 spk's per rev, tbi alternates, so 2 inj cycles
for each injector per rev.
17.26 / 2 = 8.62 milli-secs between inj cycles.
11.6 / 8.62 = 134% duty cycle.
For a v6, it's 3 sprk's per cycle. For alternate inj firings
per sprk (or bank fired on every other sprk):
3 / 2 = 1.5 inject cycles per rev.
17.26 / 1.5 = 11.5 milli-secs between inj cycles.
11.6 / 11.5 = 100% duty cycle.
Corrections welcome. . .
BobR.
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