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Tool Talk Discussion Forum

Diesel timing light adaptor

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jdemaris

04-29-2005 05:42:40




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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 if 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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Hermit

04-29-2005 19:43:55




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 Re: Diesel timing light adaptor in reply to jdemaris, 04-29-2005 05:42:40  
Why not just substitute the piezo pickup for the looped wire? The induced current from the pickup will be like the induced current from the looped wire. It may work.



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Model_T

04-29-2005 08:01:25




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 Re: Diesel timing light adaptor in reply to jdemaris, 04-29-2005 05:42:40  
This might sound like a rube goldburg contraption but bear with me. Take the the travel screw out of a pencil injector and use a short piece of 1/8 welding rod for a pushrod to open a set of points. Use chevy points with condenser attached. Hook up coil and timing light. Clamp a length of hose around injector to direct fuel to a can. I got the idea from a guy who made a balancer for model T crankshafts and flywheels using points and a timing light. Billy

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jdemaris

04-29-2005 08:10:54




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 Re: Diesel timing light adaptor in reply to Model_T, 04-29-2005 08:01:25  
Sounds like it might work, but there must be an easier way. The units for sale use a Piezo pickup, but I'm sure about the details on how it all works. You just temporarily clamp the pickup over the injector line, and it senses the pulse, and hooks to a regular timing light. I don't want to spend $300 though.



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