07-07-2012, 04:33 PM
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
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Engine capacity in combination with cam/heads/compression etc determines venturi size.
Throttle butterfly size should be 20% larger than venturi.
In the ideal world, the inlet tract should be the size of the inlet valve.
The venturi is then about 85% of the barrel size, the valve throat is also about 85% of the valve diameter.
The 58s would allow a venturi of about 46-47mm, if your engine needs this much.
I've seen quad 58 DCOEs with 47mm venturis on a 427 race engine.
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Gary
Gold Certified Holden Technician
Last edited by Gaz64; 07-07-2012 at 04:36 PM..
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