I've seen a never ending list of different timing spec's. Can someone please give me the correct spec please. My workshop manual is totally confusing giving a few different degree's of advance. I have just had the dizzy rebuilt.
Is there a idle spec as well as 3000rpm.
Regards Russell.

The car is
1985 V12HE lucas ignition
Australian delivered.

 

Here ya go.

HE Tune up.doc

Trimming the timing on a running V12.doc

 

[QUOTE=xj-c4.2;1239511
Is there a idle spec as well as 3000rpm.
[/QUOTE]

18 degrees at 3000 RPM is the official spec, but a very close approximation is 0 at 750 RPM. That's much easier to set.

 

Thank you. Mine is about 10 degree's at idle and 24 at 3000 but not pinging at all....but I haven't really pressed it past 4500 rpm.

 

All righty then...having read your attachments, I'm thinking mine is pretty right. about 10 degrees BTDC at idle the 24 degrees at 3000rpm seems right. A Jaguar workshop manual I have gives a range of 22 to 26 degrees at 3000 rpm.
We checked mine on a hoist, I too do not like the idea of being under the front at 3000 rpm on the ground.
Regards Russell

 

I would leave it alone, really.

Carefully remove the distributor cap, and drop some Synthetic oil down the shaft, and repeat annually, and forget the beast.

Mine no longer have timing plates, as I have no intention of messing with the timing in any other way than "drive timing", and the chances of having to remove the distributor for any reason are less than zero.

The vac capsule is the only other thing to watch, as it will toast overtime.

 

Yep got ya. Had the dizzy re-built and new vac unit. Took two day on and off dropping the dizzy back in and being happy with the timing. Such a little space to work with when adjusting a gear this way and that...

 

Been so .long since I fussed with V12s I was lost.