Extra advance at "light cruise" is a help in torque (and therefore economy). Essential a lean mixture takes longer to burn, so more advance is required.GrahamFountain wrote: ↑Fri Oct 09, 2020 12:36 pm I've got an A version done, but that has no vacuum unit, just the knurled nut replacing it with a spring inside to hold the arm with the plate on it in place. The arm being a long M3 setscrew with the head hammered flat sideways and a hole for the pin on the underside of the plate.
I didn't think not having the vacuum advance mattered, thinking it was mostly about emissions on the overrun. But some further research makes me question that assumption, and wonder about the aspect of economy when cruising at a constant speed.
Graham
It won't make any difference to WOT, but part throttle it will make the car more "driveable"