Re: 911/Alfa carbs

[RBoniface@domain.elided]

In a message dated 12/26/99 1:58:36 AM Eastern Standard Time, 
owner-alfa-digest@domain.elided writes:

<<  In  the late 1960s Porsche had problems with unburned hydrocarbon 
 > emissions on the 911s- turned out the sexy triple-choke carbs on the 
 > Porsche  aircooled sixes were designed for an ALFA V-6 and had a little 
 > adaptor  manifold that stretches the spacing of the carb from ALFA water-
 > cooled size to Porsche air-cooled size. So there are bends in the passages
 > on
 > the outside, and droplets of fuel would colide with the walls of the tube,
 > coalesce, grow, then fall off and go through the engine, finally
 > evaporating
 > in the exhaust stream!
 >         The elves at Porsche band-aided the problem by having the adaptor
 > tubes Teflon (tm) coated so the droplets of fuel would fall off before
 > they got too big to evaporate and combust...
 > 
 Got this from the VW bus digest. What was Alfa running V6s in back in
 the 60's? >>

I believe the carbs on the 911 were Weber triple choke 36 IDAs and it is 
doubtful that they were ever used on any Alfas of that period.  I'm pretty 
sure that they were the same units used on the Lamborghini Miura (four of 
'em).  The interesting thing is that I had heard that these carbs were 
developed for the 911, not the Miura, and that the east/west orientation on 
the Miura caused fuel starvation during high lateral g's as the carbs were 
designed to be used in north/south fashion as on the P-car.

Bob Boniface

Manager
Advanced Product Design
DaimlerChrysler

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