| jtserenityln | -- 11-18-2012 @ 6:14 PM |
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Is there an EZ procedure for finding/setting timing(4deg.btdc)for a Mallory Electronic Ignition on a 1935 stock 21 stud engine. (On old brittish motorcycles We use a fixture/plunger that screws into a spark plug hole- tdc is found by engine rotation then on second engine rotation stop at desired degrees on plunger.)has anyone ever seen one of these for a flathead? Any & all input is appreciated....***JT***
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| supereal | -- 11-19-2012 @ 10:37 AM |
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In the stock distributor drive, there is a builtin initial advance of four degrees. Without a degree wheel, it is nearly impossible to determine the amount of advance, as the crank pulley is not marked. You can determine TDC by removing the spark plug from the #1 cylinder (the front one on the passenger side) and turning the engine while holding you finger over the plug hole to be sure you are on the conpression stroke. When the piston is at the top, you are at TDC. At that point you can mark the crank pulley to match a pointer made from wire and attached to the timing gear cover. Then, back the crankshaft against the normal rotation, and make another mark where you believe four degrees probably would be. That is your target. Once you get the engine running, a timing light will tell you where you are, and you can experiment with the advance setting. Over the years, we have dealt with electronic ignitions on old flatheads, and found they are seldom an improvement over the stock setup. The relatively uncontrolled voltage level appears to confound those units, which are also usually heat sensitive.
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| Stroker | -- 11-19-2012 @ 1:05 PM |
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Regarding the use of a screw-in TDC finder, the spark plug location on a Flathead is such that the plunger on the tool will hit the block deck area between the valves, rather than the top of the piston. You can find TDC with a piece of bent welding rod, but isn't the most accurate method.
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