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40 IDA's on 911 s
Does anybody know a good starting set up?
2.7 JE pistons single plugs 9.8:1, E cam , 1.75" headers with single muffler Just checked the headers as it seemed to be causing some consternation, they are 1.5" 
Last edited by sgibson58; 07-01-2007 at 06:57 AM.. |
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06-29-2007, 06:06 AM
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Steve, Just for this test, I'd recommend you dump the Webers and
get yourself an old Holley 4 barrel off an old Camaro! ;>) |
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06-29-2007, 06:19 AM
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34mm venturi
140 main 180 air corrector 60 Idle F3 Emulsion tube Hope that helps get you started.
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Jon |
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06-29-2007, 07:02 AM
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be sure you can always get high test gas.
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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06-29-2007, 08:13 AM
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1.75" headers are way too large for a street-driven 911 with a 2.7 on Solex or 'E' cams. You will lose a lot of bottom-end torque and mid-range responsiveness!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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06-29-2007, 11:22 AM
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06-29-2007, 08:47 PM
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Does anybody have more info on that carb set up?? curious??
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HAWAIIPCAR 75 911 S |
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06-30-2007, 11:15 PM
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size venturi to engine pump max rpm. Weber has a formula which i can't find.
60 idles at 2 turns is rich for my 8.5:1 engine. 135 mains is slightly rich for it also adjust acceleration circuit flow last. adjust as lean as possible use two flow meters to synchronize the pair use a muffler w/a balance tube i use NGK BPR5ES. Seems most around here use BP5ES do upgrades. Fuel bowl vents, etc Webers can be a pia to adjust w/correct exhaust pipes. Warren is completely correct. Why look for unnecessary and of no benefit problemic large exhaust tubes?
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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07-01-2007, 12:50 AM
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 Not sure this helps
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Du must schwein haben '67 901/05 rebuilt 2.2 Bultaco Metralla 62 "XDina" '68 BMW R69S |
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07-01-2007, 05:31 PM
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SGibson, I see the headers are really 1 1/2" (you editited the first post).
Early-S-Man, does this change any of the recommendations for the carb set-up: 2.7, E cams, 9.8:1, single plugs: 34 Chokes 140 Mains 180 Air Jets 55 Idle F1 Emulsions with Tall Secondaries? BT1211....now that is a hot rod.... 
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07-02-2007, 11:52 AM
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Quote:
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07-02-2007, 12:01 PM
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Boy I would love to have a choke on my carburator. I wonder how that runs. I would assume its got tons of low end which is what I love about my solex cams and I would love some more! If only the old Dr. Porsche had installed some chokes then you wouldn't have to pump the pedal so much to start the car and then the bushings wouldn't wear out in the Webers so much and then the cars would be on the road more rather than sitting waiting for carburator maching which would lead to better sales for him and the people who needed more air flow could have taken the chokes off. But seriously, who cares about the restriction of some tiny chokes!? The only Porsche design flaw I know of.
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07-02-2007, 12:26 PM
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discussed before -- not sure what you should search on
it works worse than the 6 tube setup that we use (surprised that the Germans do things better than the US hotrods???) you can think about it this way - shouldn't each cylinder get its own tube? why should it be forced to share?
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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07-02-2007, 01:34 PM
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