Electronic Ignition, WHAT TO USE Options

[BarberDave]

(IMG:style_emoticons/default/smilie_pokal.gif)
o.k., I have a newly rebuilt dizzy for my F,I, conversion. the only trouble is it still has points. I have Petroix (sp) in the one i have on my 914 with a carb now. QUES. is which electronic ignition to buy ?What is your experience?
Dave (IMG:style_emoticons/default/smilie_flagge6.gif)

[ArtechnikA]

Will the TACH work with the CRANE or do you need some sort of an adaptor????????

here's where it gets a little confusing, especially when "The" Crane is used. i'll start at the beginning.

if you're just using the Crane optical points replacement module, it 'looks' - electrically - just like points. if your existing tach is connected to the points, you should be able to connect it to the output (white wire) of the Crane optical points replacement module and it'll work fine.

but since we're nominally talking about electronic ignitions, i'm guessing you mean the HI-6 spark box. (Crane has other spark boxes i looked at before deciding i 'needed' the HI-6...) just like the MSD, the HI-6 has a "Tach Output" signal. if your existing tach can run with this signal (some can, some can't) you're in good shape.

you -may- require an adapter to make the stock tach work with that signal - basically, the points opening and closing in a conventional Kettering "battery/points/condensor/coil" ignition switch a LOT of current and generates a BIG signal the tach likes to see - keeps it from being jittery around electrical noise... the "adapters" are basically just loading coils that simulate the big current drawn by a points setup. they're not expensive.

alternatively - you can do what i did, and plug in an AutoMeter tach with a shift light - fits right in. you could use a tach from a newer-model 911 and lie to the box about how many cylinders you've got, then adjust the revlimit switch for a lower value (2/3, i believe).