These distributors are, pretty well, bullet proof. Good Bosch quality.
The BIM024 provides for a high energy ignition.
It uses the MEC 717/718 coil.
The benefits are:-
- x3 spark energy compared to standard coils (points, Aldon, etc.).
- optimum dwell across the rev range (BIM024 controls coil saturation).
- BIM024 control minimises coil overheating (less heat = more energy to the plugs).
- coil power (via coil -ve) is disengaged if ignition is On but engine is not running.
Only down side is that the advance curve is "fixed" via the internal weights and springs (i.e. not programmable).
The advance curve is for leaded fuel but is easy to get setup for unleaded fuel and the cam (I use Performance Ignition Services here in Aust).
This type of dizzy is my preferred option and I rate it much higher that all else except maybe the 123ignition unit.
The only advantage of the 123ignition unit is its programmability on initial setup. The downside of the 123ignition unit is that it is not high energy.
BTW... this setup (Bosch dizzy with BIM024) was used in Australian Falcons from around the late 70s through to when EFI was introduced.