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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
Yup. Optimal mechanical dizzy would be both boost- and vaccum-sensitive. But it's mechanical tolerances would probably creep trough wear so it's probably safest just to install a programmable ignition module and map the advance vs. MAP curve any way you like it, leaving dizzy just for distribution purpose.

Sometimes, even programmable ignition must be paired with some sort of mechanical advance if uzing mechanical dizzy. Attempt to run pre-programmed advance on locked distributor can result in spark walking out of rotor tolerances. Rotor can only distribute spark if spark is in the ballpark of curved piece of metal doing the actual distribution. So sometimes, you have to use mechanicals just to align the rotor good enough to do the actual distribution.

The cheapest way to solve Alan's is probably MSII and Ford EDIS module/coilpack. It costs peanuts and you can leave the fueling part unused until time is ripe to go full EFI. Also, expanding to twin-plug means just bying extra EDIS/coilpack combo.
Thank you for your time,
Old 06-23-2008, 03:58 PM
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