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12a port timing question

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Old 01-31-19, 02:25 PM
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12a port timing question
Does anyone know if the primary and secondary intake ports open and close at the same time?
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Old 01-31-19, 10:21 PM
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Yes
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Old 02-01-19, 09:12 AM
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Thanks. Looking into intake runner length and resonant supercharging and if they open at the same time you can get the supercharging effect with a shared throttle body per rotor where as you usually need ITBs.
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Old 02-01-19, 03:58 PM
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Opens the same if they are ported the same

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Old 02-02-19, 12:08 AM
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Mazda did that with the vdi intake on the s5

it was worth 35 hp
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