displaying posts 1 to 6 of 6

Author Subject: inlet cam timing?
bobdylan_55

Seasoned Pro

Location: derby

Registered: 28 Mar 2009

Posts: 1,466

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Post #1
Hi people

Just wondering if anybody has any information on timing for a standard gti6 inlet cam?

Id expect it to be about 15 BTDC and 50 ABDC?

cheers

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309 GTi6-T
Posted 28th Dec 2010 at 20:33
allanallen

Seasoned Pro

Location: Buxton

Registered: 01 May 2007

Posts: 1,399

Status: Offline

Post #2
I've asked this before and no-one seems to know. From checking a few now I'd say it's somewhere around 0.55 mm lift at TDC working with the standard timing holes. Not sure of the BTDC and ABDC though as ive only ever used the lift at tdc method when doing cam timing.

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www.bridgecraftmotorsport.co.uk

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Posted 28th Dec 2010 at 21:39
bobdylan_55

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Location: derby

Registered: 28 Mar 2009

Posts: 1,466

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Post #3
Standard specifications are 205 deg. @ 0.050" lift and 0.395" but its the opening and closing timings i need Sad

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309 GTi6-T
Posted 28th Dec 2010 at 21:40
cwspellowe

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Location: Calderbank

Registered: 19 Jul 2009

Posts: 6,496

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Post #4
considering a cheeky regrind?

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Bye bye Sundance Kid Sad
Posted 29th Dec 2010 at 17:16
bobdylan_55

Seasoned Pro

Location: derby

Registered: 28 Mar 2009

Posts: 1,466

Status: Offline

Post #5
nope, its for a uni project investigating inlet manifold design on forced induction applications. Basically could you leave the inlet valve open much much longer as you are forcing the air in?
Need the inlet timing so i can figure the compression pressures at the point that the valve closes.

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309 GTi6-T
Posted 29th Dec 2010 at 17:19
cwspellowe

Seasoned Pro

Location: Calderbank

Registered: 19 Jul 2009

Posts: 6,496

Status: Offline

Post #6
I'd assume so to a degree, PeterT's cam regrinds provide longer duration instead of higher lift. Maybe worth sending him an email?

PeterT website clickey

Some useful info on his site about the 4RS engine too Smile

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Bye bye Sundance Kid Sad
Posted 30th Dec 2010 at 02:57

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