Timing Curve Maps - 123 Dist

Started by jedduh01, January 15, 2021, 10:04:31 AM

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jedduh01

Engine = 1275 - High compression build ( unknown exact specs)  Twin HS2's

Situation = friend /Customer has this car (its a sprite) it had a normal 123 Distributor in it... It worked until one day .. started running badly.
   Fuel is OK = ignition is suspect.

Swapped quick to test to a  normal 25D Distributor = car runs well again. Found the Drive of the 123 has broken, allowing too much slop in the rotor... =  messy timing.

   .
I have in hand for my future Turbo build a 123 Tune Distributor - in short this Dist you can plug up iva USB / or connect via bluetooth and play with the timing curves any way you want. This particular model even will retard timing based on boost signal.  In my haste .  the one I purchased will not work with my now sourced Block = A vs A+ == but this one i have WILL work for this car and situaiton.  Customer wants it = will take my 123 ready!


What I need - is a reference or advise for a recommended timing curve for a 1275 - Higher compression type engine.  ( Really as something to start me off)  I think long term will be get this setup on the rolling road for a real tune... but just something to start.


Any thoughts = ??

I found this as a possible start.

4 Deg @ 600 RPM
19 Deg @ 23-2500 RPM
32 Deg @ 4300 RPM

Can any one advise differently?

Thank you!



94touring

Curve 7 or Curve 3 both work well on a 1275.