I have a method of assessing comparative firing voltage. Purchase an NE2 Neon lamp from radio shack or other. It is the size of a dash light bulb with two wire leads out the bottom. Attach a stranded 20ga insulated wire to both leads. Make one about 20" and the other long enough to go to a spark plug wire from the operator"s platform or driver"s seat. Wrap the spark plug wire with 15 turns of the 20gauge wire and tape in place with black electrical tape. Leave the end free!
Ground the other lead to the chassis.
At night, or in a dark building (with appropriate venting) run the engine. An put it through load variation. The neon light will dim and brighten as firing voltage changes.
Best of luck, and interesting (I am willing to be wrong) but not yet, I have seen too many spark lines on the scope. Jim
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let’s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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