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processhead
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Post subject: Ignition Timing Light Question Posted: Feb Thu 01, 2018 7:15 pm |
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Joined: Jul Tue 15, 2008 6:13 pm Posts: 8965 Location: Gretna, Nebraska
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I picked up an old Sears timing light recently now that I find myself working on more engine ignition systems.
It is the typical gun-like unit that connects to +12 and the vehicle ground.
The pickup wire coming from the gun has a heavy single conductor lead with a Mueller clip on the end. I assume this is not an inductive pickup, and is for connecting directly to the number 1 plug wire.
If my assumptions are correct, this would seem to be an impractical way to connect to an ignition wire on a vehicle with have a boot on the end connectors?
Was there supposed to be an adapter that allowed you to connect the timing light to the ignition wire?
_________________ http://www.vintagerestorationservices.com Paul ...... how hard can it be?
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easyrider8
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Post subject: Re: Ignition Timing Light Question Posted: Feb Thu 01, 2018 7:32 pm |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 10748 Location: Mpls, Minnesota
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Looks like this and clips on the spark plug. Attachment:
T1.jpg [ 53.62 KiB | Viewed 1737 times ]
Dave
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Notimetolooz
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Post subject: Re: Ignition Timing Light Question Posted: Feb Thu 01, 2018 8:27 pm |
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Joined: May Thu 14, 2015 4:15 pm Posts: 3002 Location: Dallas, TX
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Yeah, modern engines usually require the inductive pickup. In fact I think that some don't even intend you to connect to the spark voltage. The timing is monitored via the primary (solid state) signal.
_________________ Tim It's not the Destination, It's the Journey.
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processhead
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Post subject: Re: Ignition Timing Light Question Posted: Feb Thu 01, 2018 8:53 pm |
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Joined: Jul Tue 15, 2008 6:13 pm Posts: 8965 Location: Gretna, Nebraska
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easyrider8 wrote: Looks like this and clips on the spark plug. Attachment: T1.jpg Dave Ezactly. Except mine is missing the springy thingy. But it should be pretty easy to make something like that. 
_________________ http://www.vintagerestorationservices.com Paul ...... how hard can it be?
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Barry H Bennett
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Post subject: Re: Ignition Timing Light Question Posted: Feb Thu 01, 2018 10:04 pm |
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Joined: Nov Wed 30, 2016 7:35 pm Posts: 9748 Location: Sunbury, Ohio 43074
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Mine uses an inductive pickup, and it's rather old. Yours must be a lot older.
I never had one of them thar 'springy thingies" ... I want one
_________________ Preserving the hist. of electronics, one boat anchor at a time! :) https://www.bbtvtestequipment.com
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Notimetolooz
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Post subject: Re: Ignition Timing Light Question Posted: Feb Fri 02, 2018 3:14 am |
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Joined: May Thu 14, 2015 4:15 pm Posts: 3002 Location: Dallas, TX
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I had one like that at one time. You stick one end of the spring into the sparkplug connector, the other end of the spring that is larger in diameter, you slip over the plug terminal. Then you just attach the clip to the spring. It doesn't work too well on engines with recessed sparkplugs.
_________________ Tim It's not the Destination, It's the Journey.
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processhead
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Post subject: Re: Ignition Timing Light Question Posted: Feb Fri 02, 2018 3:59 am |
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Joined: Jul Tue 15, 2008 6:13 pm Posts: 8965 Location: Gretna, Nebraska
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Notimetolooz wrote: I had one like that at one time. You stick one end of the spring into the sparkplug connector, the other end of the spring that is larger in diameter, you slip over the plug terminal. Then you just attach the clip to the spring. It doesn't work too well on engines with recessed sparkplugs. That gives me an idea. I may rig up an adapter with a old plug wire so it can reach those recessed plugs.
_________________ http://www.vintagerestorationservices.com Paul ...... how hard can it be?
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easyrider8
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Post subject: Re: Ignition Timing Light Question Posted: Feb Fri 02, 2018 4:42 am |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 10748 Location: Mpls, Minnesota
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Or you can make a adapter and put it in the distributor which may be easier than a sparkplug.
Dave
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Jthorusen
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Post subject: Re: Ignition Timing Light Question Posted: Feb Fri 02, 2018 5:28 am |
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Joined: Nov Mon 02, 2009 7:01 am Posts: 5080 Location: Lincoln City, OR 97367
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Greetings to Paul and the Forum:
I once had an old Sears timing light similar to the one you describe. Mine had a metal case. The insulation on the trigger wire was old and leaky, and the inside of the gun where the capacitance element clipped on the outside of the flash tube wasn't insulated very well either.
After the third or forth time I got bit by the thing, it went into the trash can and I bought a more modern timing light with a plastic case and an inductive pick-up.
My best advice would be to do the same. They don't cost very much money and they are soooo much more user friendly.
Regards,
_________________ Jim T. KB6GM
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Ed in SoDak
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Post subject: Re: Ignition Timing Light Question Posted: Feb Fri 02, 2018 8:13 am |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 5496 Location: Black Hills, SD 57745
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Recap and rewire, just like an old Zenith.  I picked up an old RAC engine Tune-up kit with meter, vac/comp gauges and timing light in a pawn shop. You can tell a lot about an older engine with all the tests they illustrate. It only lacks the high-current shunt for checking battery/generator amps. I guess I got lucky, the springy thingy timing light always worked fine. But had it bit me, I probably would've drove my car over the thing, spring and all, after throwing it as far as I could down the driveway! -Ed (And then listen to the air escaping from my tire, punctured by that #^@%@^ spring!)
_________________ My life is loosely based on a true story.
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Radiosmoker
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Post subject: Re: Ignition Timing Light Question Posted: Feb Tue 06, 2018 12:39 am |
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Joined: Oct Thu 18, 2007 11:34 am Posts: 3861 Location: Port Orchard, Wa 98366
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We don't need no stinkin Strobe, we used a light bulb hooked up between the 12volts on the points and ground, when the light went out then the points were connected. we fiddled with moving the distributor till we would get the right reading off of the timing mark on the flywheel. and then a feeler gage just to make sure it worked every time. Oh and another thing I would always adjust the carburetor for maximum vacuum using the mixture screw, then set the Idle screw to 550-RPM. 
_________________ Visit our site: http://antique-radio-lab.forumotion.com/ I was smokinradios Long time ago (2004)
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Retired Radio Man
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Post subject: Re: Ignition Timing Light Question Posted: Feb Tue 06, 2018 2:25 am |
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Joined: Jun Sat 09, 2007 8:14 am Posts: 4717 Location: Melbourne, Florida
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I used to have one of those timing lights that was simply a neon tube in a plastic case. One wire to ground, the other to the pug. It worked but wasn't exactly bright, in fact you really needed to have the car in a dark place to see marks on the crank pulley. A spot of white paint helped a lot. By the way, ever work on an old Chevy 6? The timing mark was a steel ball pressed into the flywheel and you observed it through a small window that had a pointer.
I still have a "real" timing light that uses a flash tube. It's powered from the ac line.
The last car I had with a distributor was my 84 Olds.
RRM
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Ed in SoDak
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Post subject: Re: Ignition Timing Light Question Posted: Feb Tue 06, 2018 8:12 am |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 5496 Location: Black Hills, SD 57745
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When I finally had a timing light it made the process a lot easier, but I still tweaked the timing to suit my ears and feel of the engine vibration, snap in the throttle. The light gave me a better reference point than I could get by bumping the starter. My '67 MGB ran much better a little bit off the "factory" spec. I assumed that was due to valve train wear. I pretty much tuned the valve clearances and carbs the same way, with hands on the running engine.
The best part was the test drive afterwards! I kinda miss those days, but not the crawling around beneath and the vast number of sockets, extensions and wrenches I always ended up dragging out to find the one that fit!
One of the tools in the old tuneup kit that is still useful on modern cars is the vacuum gauge. More dashboards should have one. -Ed
_________________ My life is loosely based on a true story.
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[ 13 posts ] |
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