Adjustment knobs coupled with a tachometer allow for more precise timing measurement at different RPMs.Adjustment knobs that allow for the timing to be read at different RPMs are available on some models.It should be able to read both two-cycle and four-cycle engines. The standard timing lights come with a xenon light tube that is able to read timing when the vehicle engine is at idle. Knowing this allows adjustments to be made via manipulation of the distributor cap to make the spark plugs fire before or after the piston has reached the top dead center, depending on the malfunction or issue that needs to be fixed. By aiming this strobe light in the proper place, usually the crankshaft pulley, you will be able to read the degree markings on it, which are indicative of where the crankshaft is in its rotation and the respective pistons. Inductive timing lights, when connected properly to the car's engine and battery, detect the electricity every time the plug fires, and every time the plug fires, the timing light shoots a beam of light. The light is powered by the vehicle it is being used to test. The light can be a stroboscope that may use a simple neon lamp or a xenon strobe lamp that provides brighter light and better use in daylight or in shop lighting. Timing lights are diagnostic tools used to observe ignition timing in vehicles with distributors and are available as self-contained units or as a part of a more comprehensive engine analytical tool. You are not doing this.See Your Car's Diagnostics More Clearly With Automotive Timing Lights It can be handy and quick to dial in the advance per the underhood spec on your light and go. if you are doing a dozen tuneups a day on a variety of vehicles. The tuning you are doing is very simple, but the wrong tools can make it very complicated. If you can find one under a $100 they do lot but you really want all the leads and pickups and the manual. Garage sales for $3 maybe? I have a Fluke 88 with a tach function. if you lack one on the dash a cheap tach/dwell meter works. You need the tach to check your max advance RPM and your idle RPM. You have a tach on the dash, no? It works. Don't need anything else-including a manual for it. I've been using a Sunpro/actron CP7504 forever. Rather than dicking with it, ditch it on craigslist (like everybody else) and just get an ordinary, good, timing light. All the computerized stuff gets you nothing but a more difficult tool to use and one with a lot more things to go wrong. I avoid their stuff for a number of reasons-only buy it when I have to.Īside from a possible stiffy from having something labeled "snap-on" (but they didn't make it), i would say the thing is a bad idea. They lack some things when it comes to a being a good company to buy from. Snap on isn't providing a manual for download. The replacement part for what looked like the more likely problem point (the leads) is $155. a whole lot of people looking for manuals and a number of people having problems. Figure since the S marks 6 degrees prior to TDC (or after, I forget) then maybe the advance on the light needs to be set there? Does this sound right? Can this type of timing light be used on an airhead?Ĭlick to expand.I looked around a bit for manuals for that. If I change the advance the S moves up and down. Problem is, without really knowing how this particular timing light works, I am not sure if the readings I get are good or even interpretable. If I set advance to 6, the S lines up in the center of the hole and at ~3000 RPM the Z lines up in the center of the hole. With the light set at 0 advance, the timing marks are unreadable. I have a snap-on computerized timing light (MT 1261A) with tach/advance functions (I don't have the timing light manual, so I basically have no idea what I'm doing - I can at least get it hooked up and the light comes on).Īt idle (~1050 RPM) the light reads about 2100 RPM (twice what it should be). Right now, I am checking the dynamic timing. I am taking care of a few maintenance items as I gradually get familiar with the machine.
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