Standard ignition advance curves

[curtacrankndaddy]

I've been studying automotive ignition for some time and one of my projects is compiling a database of old Lucas Distributors (yea, I know...). I recently acquired a few original catalogues that have good data to include in the database so I'm spending a few hours updating

http://www.planet.eon.net/~chichm/tech/lucas.pdf

One piece of information in the source is "E.C.M. Curve Number" but no reference as to what this is. I have data from another source (Tuning Lucas Ignition Systems, Speedsport Motorbooks) which has advance curve data, but no reference to an ECM curve. In compiling the data it appears that ECM curves are standard ignition advance curves and it's very likely that there was some publication that listed the data.

Can anyone tell me:

*what ECM stands for,
*is there an ECM curve reference book,
*where I might find such a book?

Marcel Chichak

http://www.starchak.ca

http://www.TDCperformance.ca

http://www.shell-4000-rally.org

 

[EngJW]

It could be an internal engineering document at Lucas. At our place we have lots of curves- cam lift tables, engine performance, heat rejections, and so on. The lab or engineering department assigns a number and then files it away. They are usually not published.

 

[NormPeterson]

Engine Control Module

What years do the ECM curves apply to? Assuming that they are EFI ignition lookup tables vs both RPM and load might explain why the Speedsport Motorbooks reference provides no information.

Norm

 

[curtacrankndaddy]

Nah, wrong end of the century. The data I'm looking for is from 1939 onward! It's the modern use of "ECM" that's blocking all my searches.

Marcel Chichak

http://www.starchak.ca

http://www.TDCperformance.ca

http://www.shell-4000-rally.org

 

[carnage1]

E eccentric
C centrifical
M mechanical
advance?

refering to the rotating weight and spring setups?
That is my best swag, i think c and m are right but I don't know about E is there a common word for vaccume used in england that could be the E?