12a port timing question

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Jan 31, 2019 | 02:25 PM

twmarler

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From: texas

12a port timing question

Does anyone know if the primary and secondary intake ports open and close at the same time?

Last edited by twmarler; Feb 1, 2019 at 09:10 AM.

Jan 31, 2019 | 10:21 PM

84stock

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Yes

Feb 1, 2019 | 09:12 AM

twmarler

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From: texas

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.

Feb 1, 2019 | 03:58 PM

84stock

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Opens the same if they are ported the same

Feb 2, 2019 | 12:08 AM

84stock

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Mazda did that with the vdi intake on the s5

it was worth 35 hp

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