No Vac. advance on my distributor... what gives?

I have a 1978 911-SC (euro).
The breakerless distributor
has no vaccum advance on it,
but my shop manuals say it
should. Is it the wrong
distributor, or is it just
because it's a euro car?

By the way; The reason I'm wondering is lately my car seems to sputter a little when getting on the throttle,
(only below 3000 RPM). I read a posting from someone with similar problems on their 1977 911 who said after replacing all of the CIS components the final cause ended up being a faulty vacuum line to the vacuum advance on their distrubutor. My car's disrubutor has no vacuum advance unit on it... really.

Leon - my car is also a Euro '78SC. It also has no vacuum line connected to the distributor. These cars run mechanical advance. I'm not sure why your shop manual states otherwise. Run the Bosch numbers off your distributor. This should tell you the application which in turn gives you the advance curve.

The vacuum diaphram as applied to 911 distributors in the '70's was strictly to apply 10 degrees of RETARD at idle, strictly for smog rules compliance!!! The 'major' centrifugal advance curve was still in effect over the operating portion of the rev range, above idle, that is!

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Warren Hall
1973 911S Targa

So is timing set @ 5-Degrees BTDC
at 900 RPM?

So is timing set at 5 Degrees @ 900 RPM