Todays date is 12/21/2024
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Intake Runner Length Calculator
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The Intake Length is from the back of the valve face to the opening of the plenum.
Grumpy Jenkins said 30 years ago (for V8) that developing a plenum volume on a dyno will trip
you up every time. The best place to start is to get a good figure, then reduce the volume
slowly until you get a slight power loss. The next-to-last (before the loss) volume -10% is
what to run on the car.
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Larger the engine and higher operating range the larger the plenum and runner volume can be.
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In general if the runner area and length is good but the motor continues to pick up with larger plenum than used elsewhere you need more carburetor.
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If you have no or minimal power loss when the volume goes below 1 cylinder the carb is probably too big.
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