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> > > Can our UK listees confirm that late dual carb engines came with mech/vac > > > advance dists? The "R" and "T" distributors that I have are vacuum advance only, unless I'm very much mistaken. The latter was apparently used 70-72. How late is late, and how can I be sure that it's not mech/vac advance? I've never seen the "P" and "S" distributors that the late dual carb automatic cars came with, according to Jim. Certainly when you suck the vacuum can the whole breaker plate turns and stays turned. The R and T units don't actually appear to differ from each other in any way, as far as I can see, so the difference must be pretty much invisible (or I've missed something obvious). Jim, if you're interested in having a look I can send you the R distributor, which is defunct (stripped points screw hole). If you think you can rebuild it, that would be great too. Daniel Baum 1969 Type 34 automatic Email: daniel@type34.info Homepage: http://www.type34.info > > > > > Yes- well mine did- that is assuming that it is the original dist- > > >From what you say, it probably is. > > > > Has anyone noticed a difference in the vac drilling in late vs early > > carbs? > > > > I checked in my box of carb bodies and they appear to be the same- there is > > a .6mm hole in the carb body leading in behind the venturi, then running > > down a passage moulded into the venturi into the throttle plate, then out a > > square aperture on its base- below the throttle disk. But wouldn't that give > > you high vac at idle?- this doesn't seem to be the case- maybe its just at > > take off when the throttle opens a little and the engine revs causing a > > strong vac beneath the partially open throttle? The early and late all > > appear the same though the throttle disk and idle transfer drillings are > > different. I guess the vac can might have changed? > > The way it is done on the FI cars, the drilling is close to the throttle plate > in a position where it is upstream when the plate is fully closed and as it > starts to open, but when the throttle opens a bit more it is over that port and > we get a vacuum there if the air speed is high enough. If we open the throttle > all the way the whole aperture is open and the air speed across the port is > slowed down and the vacuum drops. > > It can make a LOT of difference if this port is moved just a few mm so look > closely at your parts. OTOH, didn't someone once mention that their port went > right into the venturi, which is where I was expecting it for a vac only dist? > > Is it possible that all your Solex bodies are "late" ones? > > -- > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > ------------------------------------------------------------------- > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > > >