ignition timing

[Fortyfiver]

Hi All
Just set timing to 12 degrees, the mechanical advance takes it to 20 with the vacuum pipe disconnected then the vacuum advance takes it to about where 28 would be, does that sound about right
Alan

[Wheelz]

Hi All
Just set timing to 12 degrees, the mechanical advance takes it to 20 with the vacuum pipe disconnected then the vacuum advance takes it to about where 28 would be, does that sound about right
Alan

Advance varies depending on which dizzy you have. The figures are in the ROM, and the model is marked on the side of the casing eg 41525 is usual Mk2 UK, 41336 is the usual Mk1 UK model.

[trunt]

As. Chris says, all in the ROM under ”engine tuning data” at the front but the mechanical advance looks a bit low even for a mk2 (which maxes out at 12-16. So 24 to 28)

you will need the 77 Version of ROM for the Mk2

[MikeParker]

Hi All
Just set timing to 12 degrees, the mechanical advance takes it to 20 with the vacuum pipe disconnected then the vacuum advance takes it to about where 28 would be, does that sound about right
Alan

Definitely sounds like too little speed advance. Also many of us run our Stags at a static timing of 14-16 degrees which can reduce time on choke and improve responsiveness. Just listen out for pinking in case there is excessive timing jitter. Top down driving, window down, with a concrete crash barrier on the drivers side is a good way of getting good audio feedback from the engine. Not easy to arrange unless you live near the A3 or the like!

[Fortyfiver]

Thanks for the advice, when I checked it with the timing light it was at 16 so put it back to 12, will probably put it back then
Alan

[flying farmer]

What I have found is the distributor springs tend to stretch and wear a fraction.

Combine this with the spindle not getting lubricated properly over the years and the distributor doesn't return to its non advanced position.

The mechanical stop on the advance mechanism is usually stamped 7 degrees or 13 degrees. This is distributor degrees so actual crankshaft advance is 14 degrees or 26 degrees if the distributor is working properly, in addition to the static timing. Total would therefore be about 26 degrees mechanical advance on a MK2

Neil