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Location: Central Florida
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Thoughts on this carb jetting configuration
3.2L short stroke
9.8:1 CR 98mm P&Cs Early SC Heads - single plug Elgin S cams (similar to GE60s) Electromotive HPX ignition 1 5/8" Headers and Sport Exhaust Weber 46 IDA carbs 38mm Venturi 60 Idle jets 160 Main Jets F7 Emulsion tubes 160 Air correction How does the carb configuration sound?
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Qarl |
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08-05-2003, 08:51 PM
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Karl,
Those venturis are sized for a power peak at almost 6900 rpm ... sounds a bit high for GE-60 cams!
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-05-2003, 10:33 PM
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The Elgin Modified S Cams (similar to GE60) should produce peak HP between 6800 and 6900 RPM. So shouldn't this be right?
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Qarl |
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08-06-2003, 04:33 AM
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Is this a race engine? If not, the fundamental problem is the big carbs. Go with 40's for street use.
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08-06-2003, 09:31 AM
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Karl,
Big problem with that chart is that it is, or seems to be, for a 2.0 engine [6800 rpm power peak for 'S' cams -- only valid for the '69 production engine] ... The power peak with 'S' cams dropped to 6200 rpm for the RS 3.0 engine, and would drop to perhaps 6000 - 6100 rpm in a 3.2 engine! GE-60 and your Elgin grind would see similar drops in a 3.2. I think you ought to go back to Elgin and ask what the power peak rpm should be for your setup. I think 35 mm venturis would be closer to matching your cams.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-06-2003, 09:46 AM
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Both... Street car some... Racing yes...
Based on displacment and cams it's right on the cusp of 40s and 46s... Plus, I already have the 46s.
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Qarl |
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08-06-2003, 09:47 AM
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YOu may want to fax PMO.
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08-06-2003, 10:21 AM
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Thanks everyone!
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Qarl |
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08-06-2003, 11:13 AM
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