thanks for the correction here.
I do remember seeing an injector squirt with an ignition pulse.
which....since I like to test injectors by turning a distributor with my
fingers ( even another distributor ..and leave the regular one in the
engine still ) ...is easy to see.
slight turn of the dist with fingers, make an ign pulse .. ....fuel pump
triggers on...and injector/s squirt, each pulse.

S.

On 11/16/2013 5:28 PM, JRodgers wrote:
> Wow!
>
> Thanks Mark, for even more illumination on how things work in our
> mechanical beasts!
>
> This is all great stuff for those of us that don't know!
>
> John
>
> On 11/16/2013 4:24 PM, mark drillock wrote:
>> The injectors do fire in time with the engine position. All 4 injectors
>> fire once every hall pulse which happens every 180 degrees of crankshaft
>> rotation, so twice for every engine revolution. The ignition spark is by
>> definition according to engine position and the fuel injectors fire
>> based on the same triggering event that the ignition uses. Of course the
>> ECU adjusts the ignition point to optimize it. The ECU also cuts off the
>> injection pulses when conditions dictate, such as going down hill with
>> your foot off the gas, assuming your throttle position switch is
>> working.
>>
>> Mark
>>
>> Scott Daniel wrote:
>>> minor correction ...waterboxer injectors don't turn on 'every
>>> revolution' ..
>>> They are triggered continously in pulses...or in 'injector on time, in
>>> milliseconds of duration.'
>>>
>>>   - as one big 4 part injector too btw.  Called batch fire.
>>> Not sequential, not timed to engine or piston position.
>>> Somewhat crude.
>>>
>>>
>> .
>>
>