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Jeff Alton's Avatar
 
Join Date: Jan 2003
Location: Langley,B.C.
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Carb size question??

Just curious about carb size.... 3.4, 10.5, twin plug, 1 5/8 headers, ge40ish cams..... How much power am I giving up using 40's instead of 46's?? Car is dual purpose street/track so drivability is important too. Or are the 40's just way too small??

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Old 02-08-2006, 09:16 PM
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Jeff:

A 3.2 or 3.4 needs 46mm carbs. The venturi's can be sized for how you drive the car and what you like,.....
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Steve Weiner
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Old 02-08-2006, 10:34 PM
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If you want to shift past 6500 rpms, I would say 40's are too small.
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John Dougherty
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Old 02-08-2006, 10:34 PM
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Very well then! 46's it is then!

Cheers
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997 S 4.0, Cayman S 3.8, Boxster 2.7, Boxster S race car, 996, 955 Cayenne TT, 958 Cayenne TT
Old 02-08-2006, 10:52 PM
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Henry Schmidt's Avatar
 
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I agree with all the preceding posters. One thing to remember is that you can change the butterflies on you 40 to 44 or 46 and end up with what you need at a reasonable price.
When choosing a carburetor for track use it's important to remember that Porsche never used a 40mm carburetor on anything larger than a 2.0 and that engine used a 46 with 42 mm venturies.
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Old 02-09-2006, 05:14 AM
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