![]() So he turns the idle down to like 750, and then the car stalls. ![]() ![]() that is way too fast." But he thinks he spent all this money on this timing light, it must be right. So, imagine his surprise when he hooks up this new fancy timing light to some GM car we have in the garage, and it reads at 1900. It doesn't matter how many cylinders you have, all of them must fire within two revolutions of the crankshaft. So it figures out the revolutions per minute. It knows that the crankshaft must go through a certain amount of revolutions for all the cylinders to fire. So the way it works is you hook it up to one of the spark plugs and it counts how many pulses there are in a certain amount of time. So to recap, one of the guys at our garage, years ago, bought this new timing light that had all these fancy things built into it, including a tachometer feature. Okay, time for the answer to this puzzler about timing lights. And he throws his hands in the air and says, "What is going on here?"Īnd that is the puzzler question today. He then takes it back to the first car, hooks it up, and it again says 1900 RPM. So he knows the new timing light is not broken. And another guy uses his tachometer, and it also says 900. So, he takes the tachometer to another car. So he thinks this new timing light is broken. It doesn't sound like it is that fast, but that's what it says. 1900 RPM! And he says, "This can't be right. He hooks up this brand new expensive timing light and the thing reads that the engine RMP is 1900. So, he hooks this thing up to some GM car, don't remember which one. Basically, it figures that for every two revolutions of the crankshaft, the cylinder has to spark and it tells you how fast the engine is going. And while it is doing the timing for you, it counts how many pulses there are, and then it counts how many times that happens in a minute. Among other things, this timing light had a tachometer feature. It was a great timing light, even though it was overpriced.Īnd this timing light, which was new at that time, had all these things built into it. Years ago, one of my guys at the garage bought himself a brand new snap on timing light. An automotive puzzler for you this time! Finally.
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