efi555

[ARTHUR OKUN]

You wrote: 
>
>In December we had a small thread going on 555 based efi systems.
>This looked like a fun project so I rigged one up on the bench. There
>wasn't alot of detail in the thread so I'm guessing here; I presume
>the 555 was used as a pulse width modulator.
>
>In any event I configured my test as a pwm setup. The signals look 
just grand.
>They seem to do everything right, my compliments to whomever thought 
this up.
>I want to go ahead and try this on something but I have one nagging 
thought.......
>
>Is there a way to safeguard against run-away? It seems to me that a 
vacuum
>leak in the intake system could send the engine into orbit, the only 
limiting
>factor would seem to be the amount of fuel getting passed the throttle 
plates.
>
>Anyone have any thoughts??
>
>
>Dan
>
how about another 555   used    as   an   rev   limiter   sensing   
ignition coil primary pulses