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By DANIEL TINDER - 18 Years Ago
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In a previous thread I had theorized about a mechanical-stop to limit the advance on Loadomatic distributors. Turns out, someone on ePay is selling a vintage (?) Offenhauser part designer for that purpose. It screws into the diaphragm and limits travel with an adjustable stop. If your dampner/pulley were fully degreed, this might allow accurate re-curving without a SUN machine? A little trial & error twiddling of the spring posts to accelerate the curve, and you could theoretically limit the max advance with a timing light while the engine is running?
Which makes me wonder why there is always so much room for improvement from factory settings. I assume economy/smoothness/longevity?
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By DANIEL TINDER - 18 Years Ago
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Update:
I obtained one of those vintage "OFFY" adjustable advance-stop devices (actually made by OMEC). Turns out, instead of the micro-adjustment limiter I expected, the diaphragm stop-pin is SPRING LOADED! Turning the adjustment knob merely tightens the spring tension. The included instructions (for a different model/configuration) suggest removing the factory advance springs (something I won't do as it changes the entire concept, and complicates the recurve/setup process).
There does not appear to be any way to disassemble it and remove the spring. Also, no jamb nut is provided to lock it's adjustment setting.
I may test it by cranking up the initial timing until the motor run rough with light load, and then install the device with the adjustment at minimum tension, and see how it runs? It could also be used effectively by setting it to MAX tension and using a SUN/strobe machine, grind off the diaphragm-stop stem a little at a time until the proper advance limit is achieved.
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