Vacuum advance is only needed on cruising at partial throttle when the mixture is lean. So I agree with part of your link.
But don't agree with the rest of the article
Vacuum advance is ALWAYS ALWAYS ALWAYS connected to a ported outlet on the carbs.
And and setting your timing at say 12 deg BTDC is all well and good but what is your total advance??
When I set timing I'm looking at total advance. Yes 12 deg BTDC is a good place to start but you want to look at total advance.
Set the timing up so the car runs nice but then rev it up until about 3000rpm until the mechanical advance it maxed. That should be 32 - 35 degrees. Engines are engines and they all work the same. Our Rover engine is a GM engine after all.
If you engine is running better with the vacuum advance connected to manifold vacuum and of course it is you might have it to far retarded. Dose it ping at all? If not keep advancing the dizzy until it dose and them back it off a little.
04 L322 Vogue V8 - Work truck
07 Freelander 2 TD4 SE - The wifes
74 Leyland P76 Targa Florio - Aspen Green
91 Kawasaki GPZ900R
Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8
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