Hello everybody,
In the context of ignition I have a question. I had the engine in AEX31 rebuilt some years ago with some modifications being made. Mainly higher compression and a fast road cam. Now I’m wondering if anybody on the forum have any experience with a slightly tuned engine in regards to ignition timing.
The company that helped me with the rebuild states that the static advance should be set to 2 degrees BTDC and full advance 36 degrees. If I then look in the data supplied by the AC factory they state 12,5 degrees for a standard UMB engine and 21 degrees for the later engines with a higher compression ratio. The enormous difference makes me wonder what other people’s experiences are with this. To complicate matters even further Archibald writes in his 2-litre saloon book that an engine with a higher compression ratio should have an ideal static timing advance of 10 degrees… and full advance should be no more than 42 degrees on a tuned engine.
Obviously the advance curve of the distributor makes a big difference, as far as I can see from measuring a couple of standard Lucas DX6 distributors the full advance they gave was something like 12-14 distributor degrees which would equate to 24-28 degrees advance, on top of the static advance given as either 12,5 or 21.
So wonderful if anybody with experience of running a higher compression Weller engine could tell me and the forum something about their experiences in regards to what settings they use and how well that has worked, or not!
Thanks in advance for any input.
Regards Jonas