Hi again,
The dizzy has just one vacuum line attachment, i'm pretty sure this is a multi advance / retard. This doesn't move the timing marks at all when i disconnect or connect it at idle. Lotus notes states 22 crank degrees vacuum, but is that advance or retard? Funny thing is, that 22 degrees would account for the 20 odd degrees of advance that i'm seeing, so maybe that is the answer. Should I see vacuum retard of 20 degrres which I'm not getting at idle?
Slowly increasing the revs puts more advance into the window reading, so the auto advance weights in the dizzy are working, smoothe and even with increase in revs, so dizzy appears working good. Haven't checked the vacuum operation yet tonight as I need more hands, one to hld the light, one to increase the revs and one to disconnect and connect the vac tube. I'll try to get to that tomorrow.
Thanks for your inputs Hilly and 910esprit, I did think of checking TDC by feeling a piston rise / fall but again need more hands.
I'll post again when more info available.
There can't be anything major at fault since the engine runs nice under load, even if it does show 30 degrees advance in the window.
It can't actually be 30 degrees advanced because it runs good, but why is it showing 30 degrees.
Hot from the garage,
I have zero vacuum from the Thermal Ignition Control Valve, which means I'm missing out on 20 degrees of advance at idle, consequently it will run good at 30 degrees setting because it would be at that anyway if I had the vacuum.
One thermal ignition control valve should cure the fault, plus reset to dynamic 10 degrees with vacuum disconnected, then when i reconnect, hey presto 30 degrees at idle.
Why didn't I think of that.
Thanks again Hilly and 910Esprit, you jogged me into it. Fantastic stuff.
I'll let you know the final outcome.
Cheers for now.