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Diesel timing light adaptor
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Posted by jdemaris on April 29, 2005 at 05:37:17 from (209.23.30.175):
I want to build, or buy a reasonably priced pulse adaptor so I can use a conventional timing light on diesel engines with mechanical injection. So far, the one I've seen for sale is made by Ferret and sells anywhere from $200 to over $300 is you buy it under the Snap-on or OTC name. Also, when you buy it, it is specific to the precise OD of the injector line, and extra adaptors for different sizes are close to $100 each. I suspect, as is the case with most specialty tools, this thing cost about $20 to make. So, has anybody ever made their own or found a cheaper units around? I found the following suggestion for building one, but it doesn't sound like it is actually for mechanical injection: "Make a 100 turn loop of #26 magnet wire that is large enough in diameter to put around the injector solenoid (loose loop). Wrap tape around to hold the loops together. Drive the base-emitter on a 2N3055 transistor with the loop outputs. Connect your strobe trigger connection across the collector-emitter on the transistor. You might want to add a 1k, 1/4 watt potentiometer in series on the transistor base and start with it at 1k, adjusting down until it's just enough to trigger the transistor. The 2N3055 is pretty cheap and it has pretty high gain. This means it will use very little induction current from the injector to trigger it."
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