Min. injector off time

[Ward Williamson]

Bruce,
  Well here's the deal,  When your engine temp get's to 215 or so and
you cooling fan turns on, have you ever measured the current draw on
fan startup? 35 amps or so, atleast mine does.  Then once it get's up
to speed it only draw's 15 amp. right?  Same as an injector. With more
avail. current their won't be as much voltage drop on inj. opening,
which in turn will make it open faster.  This is kinda hard to explain
so if you want more just ask.  Thanks
  
  Ward





---bruce plecan <nacelp at bright.net> wrote:
>
> ref Ward Williamsom:
> 
> Another trick is to run peak and hold driver's with a saturated
> switch injector,.........
> 
> How does that work?.  A peak and hold driver allows four amps
> to flow, and then drops off to one, or so I've been told.  A
> saturated injector has a resistance of 12-18 ohms, so it will
> never "pass" four amps.  At 12V, a 12 ohm injector will pass
> 1 amp,  Well some EEs will disagree, but cording to the ohms
> law I know that sounds right.
>   With some schematics I seen there is a resistor on the ground
> side of the device that grounds the injector on the peak+holds
> to monitor the current, at least that's my assumption.  In which
> case that would be a current limiter on the saturated injector,
> which would slow it down if anything.  Any EE who has this
> figured out, I'd like to hear it....
> Bruce      On the issue of Cone shaped hats and mice not
>                getting cancer we need to know if it is cause or
>                effect.  There may be an up side to wearing them
>                after all....
> 

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