Re: Ford injectors (& Question)

["Dave Zug." <dzug@delanet.com>]

So if I have this right, Let me write this in other terms...

Lets say for example a car cruising is doing 5 ms pulses at a constant 6000
rpm (for math's sake).

Its pulsing like this:

each bit is 0.5 ms: (2 crank revs = 1 cam rev =20 bits). 20 ms time is
represented (4 engine "strokes").

1111100000 1111100000 1111100000 1111100000 Left
0000011111 0000011111 0000011111 0000011111 Right
<----------10 ms--------> <---------10 ms--------->

Alternating left and right for HALF the PW time each 10 ms to complete the
full PW time within one CAM rev.

Then we go to WOT and for math's sake lets say we gain no RPM's or fueling
requirements.

Its pulsing like this:

each bit is 0.5 ms:

1111100000 1111100000 1111100000 1111100000 Left
1111100000 1111100000 1111100000 1111100000 Right
<----------10 ms--------> <---------10 ms--------->

Now to the (almost) REAL world.. Heres what WOT looks like (constant 9 ms
requirement) :

each bit is 0.5 ms:

1111111110 1111111110 1111111110 1111111110 Left
1111111110 1111111110 1111111110 1111111110 Right
<----------10 ms--------> <---------10 ms--------->

The above example has the injectors on IN UNISON for a total of (0.5 ms *
18) or 9 ms over each 10 ms (1/2 valvetrain cycle) period. the listed PW
then repeats itself for the next 10 ms with no recalculation taking place
(??) to complete the valvetrain cycle.


Do I have it right?


----- Original Message -----
From: Roger Heflin <rah@horizon.hit.net>
To: <gmecm@diy-efi.org>
Sent: Friday, August 18, 2000 2:09 AM
Subject: Re: Ford injectors (& Question)
> >
> > To the question... at 6000 RPM, it is 20 ms, not 10ms between the time
an
> > intake valve begins to open until THAT intake valve begins to open
again.
> > (100 crank rotations every second = 50 cam rotations = 50 valve cycles,
but
> > you know that) Specifically for the driver configuration on the 730 and
165,
> > someone please tell me why 10 ms is considered static. Is it that a
driver
> > is toggling between 2 banks of injectors and is only able to fire any
one
> > bank for 10 ms?  I'm sorry to NOT have this clear in my mind after years
of
> > twiddling and reading.. but I'd like it clarified one more time please
and
> > thanks.
>
> It is 10ms for a batch fire car, they fire it 2x a sequentail
> car for only 1/2 of the time.   They are (at WOT) firing both banks at
> the same time, but only for 10ms instead of 20ms. and they will fire
> twice for injector time listed in that 20ms.    Most of the batch fire
> cars seem to work this way, the seqential ones don't, and work the way
> you described.   I believe the big reason is that that is the way GM
> decided to do things.
>
>Roger

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