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Join Date: Feb 2000
Location: London, UK
Posts: 2,349
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40 or 46 IDA Webers on 2.8 twin-plug ?
I have a 2.8 twin-plug engine built from:
'73 2.4S case 'S' cams Mahle 92mm RSR pistons/cylinders twin-plugged 2.4 'S' heads custom-built billet distributor with Marelli twin-plug cap & rotor On the dyno the engine produced 217 bhp at the rear wheels (estimated 255 bhp at the flywheel) running on 40 IDA Webers with a twin-outlet sports exhaust. Would the engine produce significantly more power on 46 IDA's (enough to warrant the extra cost of the carbs/manifolds) ?
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Andy M&W 904 ... now gone GT-style 356C ... also gone |
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11-19-2005, 11:53 AM
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On the dyno you might see a higher peak HP number (7400 rpm or so), but overall the driveability will suffer. I wouldnt spend the money there unless you can sell the 40's to offset most the cost.
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John Dougherty Dougherty Racing Cams |
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11-19-2005, 03:40 PM
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Don't mean to steal the thread, and hopefully this is along the same lines, but John, do you have a baseline venturi size recommendation for a 3.0 with 46 mm Webers w/ tall manifolds, RSR cams, 10.2 comp., mildly ported heads, twin plug, and 1 5/8 headers and megaphones in a race only application shifted at 7500 rpm? Thanks!
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Joe 996 GT3 RSR |
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11-20-2005, 08:55 AM
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Joe, I would baseline it with 42mm venturis.
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John Dougherty Dougherty Racing Cams |
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11-20-2005, 09:16 AM
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Thanks so much, John!
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Joe 996 GT3 RSR |
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11-20-2005, 09:24 AM
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