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dual vac advance on a 73.


flyingfool

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as your 73 isn't engineered for that--and the vacuum retard was emissions related anyway and didn't do anything for the car's performance.

cheers

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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Guest Anonymous

+1 on Mikes advice. and don't plug the retard side either. It needs to be open so it doesn't block the advance side from 'advancing.'

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Guest Anonymous

Thought it about it a bit more. Consider this. When you set the dist on the smogged car you set it with the retard activated. 0 deg. TDC is then in a retarded position many degrees (8-10 deg I think). From that position, the shop manual requires 51 deg of advance from the dist under load conditions. If you use that vacuum advance without the retard side, your total advance is less. And the position of the distributor when at 0 TDC will be different.

Make sure that your engine doesnt require 51 degrees of advance and that you can position the dist with advance installed at the 0 TDC position.

If those requirements are met it should work.

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I'm with Geezer, don't use the dual vac. You should be able to find a good used correct vacuum advance one for less headache than fussing with the dual vac unit...

Tom Jones

BMW mechanic for over 25 years, BMWCCA since 1984
66 BMW16oo stored, 67 1600-2 lifelong project, 2 more 67-8 1600s, 86 528e 5sp 585k, 91 318i
Mom&Dad's, 65 1800TiSA, 70 2800, 72 2002Tii 2760007 orig owners, 15 Z4 N20

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i think i follow you with that...but as the whole engine timing business is still a bit fogy for me, ill just take that as its complicated haha.

and for finding a good used one. well, thats why i was asking. i havnt and theres this one really close to my GFs house...

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