Quote:
Originally Posted by diesel_john
i was just toying with a prototype injection signal measuring sensor yesterday, you might need to attenuate the signal a bit with a couple Meg pot so you don't over range your A to D.
Parts: 2 used GM knock sensors, one 1/4" FPT x 1/4" FPT pipe coupling.
Tools: a drill bit the size of my injection line, a 1/4" pipe tap, hack saw or dremel.
Procedure: drill a hole in the center of the coupling, thread the coupling deeper on both ends until the knock sensors will reach in to the hole, cut one side of the coupling out until it will fit over the injection line.
Place coupling on a straight section of the injector line.
Hand tighten the knock sensors until they clamp on the injection. Wire the sensors in parallel. Attenuate signal as needed. see pic
i tapped on the bolt with a pencil and it made the analog bar on my Fluke jump, i don't think signal strength is going to be a problem.
Oh, BTW, there are two of these knock sensors threaded into the bottom of the water jacket on most injected 350 chevy's. make provisions to handle the antifreeze when you unscrew them.
|
Ok this is just ingenius. I love it.
questions and suggestions. Id love to see a scope reading off of this.. part and full throttle.. pretty please?
I suggest a junkyard for those knock sensors or just get a couple new ones from the parts house.
I seriously would drop all my current projects to try this except its a pain in the butt getting to my injector lines in my VAN. I have a custom doghouse and laptop holder all setup right in the way.