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Old 03-02-2010, 09:39 AM
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Help-how to overdrive a roots blown engine?

Does any one out there have any experience with the changes that need to be made to overdrive a blown BBC motor? Are there any basic rules of thumb as to drive ratios and jet size increases? My engine runs great 5% under driven but I would like to swap some pulley's and go 5 to 11% over without damaging something. The car is a drag car so I can't test it on the street . Any help would be greatly appreciated.

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Old 03-02-2010, 10:50 AM
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Cubic inches? Static compression ratio? Blower type? Screw type? Roots type? 6-71 Small bore? 6-71 Large bore? 8-71? 10-71? 14-71? Fuel used? Carburetion used?

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Old 03-02-2010, 01:02 PM
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It is 458 cu. in., 9:1 static CR, roots 8-71 ,on 110 race fuel with twin 4150 850's and factory jetting.
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