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I'm still getting worse than expected MPG despite new pistons cylinders and
valves, and I think its due to my ignition timing. The car has been running
ok but I checked the timing again anyway. I've heard Jim say that the vac
advance shouldn't come into effect when the car is stationary- only when
cruising at partial throttle. Well mine definately does come into play as
soon as I rev the engine and it shoots up. If I keep revving, the advance
goes up to 40+ deg! (I put a paint mark on at about 35) With the hose
disconnected it maxes out at my mark.
So I really don't understand whats wrong. The carbs are now the original
ones and have been re-built, but the same has happened with 2 other pairs of
carbs. If the balance were slightly out, could that cause a too strong vac
signal? (I checked the balance and on my synchro-tester it seems very good).
I checked and the arm on the vac can has number 507 stamped on it- does
anyone know if this is the right can for a late ('73) european spec dual
carb engine? If its not, does anyone have one?
I disconnected the vac and ran the car on a longish run this weekend and it
ran better than before. Timing is stock 7.5 deg adv at idle and otherwise
the dizzy is in very good health. Any ideas?
TIA
Mark Seaton
'73 Fasty London
Motion Systems Technology Ltd. (Mo-Sys)
Unit B211 Faircharm Trading Estate
Creekside
Deptford
London
SE8 3DX
T(0)20 8694 2076
F(0)20 8694 7918
WWW.MO-SYS.COM
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