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914World.com _ 914World Garage _ Curious... factory -6 carb specs

Posted by: Scott Schroeder Dec 30 2009, 06:27 PM

Hi All -
Being that Porsche sold cars in all 50 states, shouldnt there be a factory listing for the different carb settings/jet sizes for the 911? Obviously the cars that were sent to different altitudes had to be set up with different jetting. Has anyone ever heard or seen any sort of technical bulletin?

Scott S

Posted by: Al Meredith Dec 30 2009, 07:12 PM

Check in Anderson's book, he discusses the origional factory jetting (smog) and the recommended jets.

Posted by: Gint Dec 30 2009, 07:13 PM

I have a copy you can borrow Scott.

Posted by: jmill Dec 30 2009, 09:43 PM

Does this work?

Attached image(s)

Posted by: GeorgeRud Dec 30 2009, 11:20 PM

The top line of the chart (2.0 liter with L cams) looks quite right, though I don't have the spec book handy.

I know that the original venturis are the 27mm ones, a common upgrade was to enlarge to the 30mm ones on the 40 IDA carbs (along with larger jets).

I don't believe that Porsche specified different jet specifications for higher altitudes, though I'm sure most owners living there had to change their jets to compensate for the lower oxygen levels.

Posted by: brant Dec 31 2009, 12:12 AM

Scott,

want to borrow an innovate?

ha....
Told you my little 2.0 jetting wouldn't work for you
were using:
34vents
170mains
another 50 units of 2ndary enrichment (IDS)
and about 220airs
55idles

I just bought 35vents and 180/190 mains for the new 2.1 that is getting built.

Posted by: Scott Schroeder Dec 31 2009, 04:08 PM

Ha! Holy cow Brant!

Brant, who do you order your jets from?

Thanks for the chart Jmill.

Mr Gint - I would love to borrow that book. I think I will also call PMO, as I will be using their spacers between the head and the intake manifold - I am sure that will alter things too.

Happy New Year

Posted by: campbellcj Jan 1 2010, 02:17 AM

PMO has jets and many other parts.