gbowley wrote:
> Hello all,
> Hope everyone had a nice weekend!
>
> I need some clarification on dynamic engine timing for my 75 Spifire.
> This car is a little unusual in that it has the Lucas mechanical
> (points) distributor. I believe the car originally had the electronic
> Lucas distributor due to the fact that the drive resistor is still
> bolted to the air pump check valve bracket.
>
> My question is, according to the Hanes shop manual, the dynamic timing
> should be set to 2 degrees ATDC with the vacuum line connected to the
> distributor, (USA models). However later on in the manual, it says the
> vacuum line must be disconnected and plugged for a points-type
> distributor. I guess my question is what should I set the dynamic timing
> to for this car due to the fact is has a points-type distributor
> retrofitted to it.
> BTW, the car has been running at 10 degrees BTDC for the past year,
> (this is with the vacuum line connected.) I tried setting the
> distributor to the 2 degrees ATDC this weekend, but the car lacked its
> normal power :-), (if you can call it that.)
> Any suggestions, or does anybody have a different shop manual that they
> could compare?
>
> --
> Glenn E. Bowley, ABOC
> Mechanical Designer/
> CAD Systems Administrator
>
> Gerber Coburn Inc.
> 55 Gerber Rd.
> South Windsor, CT 06074-3244
> gbowley@snet.net
Glenn
My 75 Spit has the same conversion and I
have been running with the timing set at
8 degrees BTDC and a point gap of .015.
Mine does not have vacuum advance(retard)
and seems to run fine at this setting, ie. starts
fine, no pinking on acceleration and no runon
when ignition is turned off.
Hope this helps
Chris Taylor
75 Spitfire
Burlington, Ontario
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