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Posted: Tue Feb 10, 2009 3:49 pm
by hambone
I have not noticed a flat spot on our '68 Beetle with a vacuum only distributor. What is the advantage for the combination vac/mech? I'd wager it has something to do with emissions and engine heat.
Posted: Tue Feb 10, 2009 5:31 pm
by Amskeptic
hambone wrote:I have not noticed a flat spot on our '68 Beetle with a vacuum only distributor. What is the advantage for the combination vac/mech? I'd wager it has something to do with emissions and engine heat.
The vacuum only distributor is much better able to time according to load. This is gentler on the engine. With the correct carburetor and a healthy engine, vacuum only is a fine bit of engineering.
John Muir was being disingenuous with his 009 penchant, as he was with anything that he did not understand.
The centrifugal advance coupled with vacuum advance gives you the best total timing support for speed and load.
Colin
Posted: Tue Feb 10, 2009 7:40 pm
by spiffy
Hammie, let me know if ya want another vac only dizzy. I picked one up at a swap not knowing it was vac only...don't have a use for it. Maybe you can keep it for your stash.
Posted: Wed Feb 11, 2009 9:17 am
by hambone
Sure I'll take it off your hands for the stash. Maybe the next camp trip whenever the hell that will be...thanks. Both my VWs have the same distributor so it will come in handy.
Posted: Mon Feb 23, 2009 5:28 pm
by justgimmecoffee
Not to hijack a thread but....
The Bosch distrib that Chitwnvw referenced
http://www.cbperformance.com/catalog.asp?ProductID=1348
is that the correct distrib for my '79 bus with FI?
the PM (previous mechanic, not Trafton's, they did a fine job) installed a non-vacuum advance dizzy; when I asked, he sez thats what VW calls for now. I don't believe him.
-Barry
Posted: Mon Feb 23, 2009 6:15 pm
by chitwnvw
You have a vac advance port might as well put it to use.