Author	Subject: inlet cam timing?
bobdylan_55 Seasoned Pro Location: derby Registered: 28 Mar 2009 Posts: 1,466 Status: Offline	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 ________________________________________ 309 GTi6-T
Posted 28th Dec 2010 at 20:33 Profile

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. ________________________________________ www.bridgecraftmotorsport.co.uk Facebook
Posted 28th Dec 2010 at 21:39 Profile

bobdylan_55 Seasoned Pro Location: derby Registered: 28 Mar 2009 Posts: 1,466 Status: Offline	Post #3 Standard specifications are 205 deg. @ 0.050" lift and 0.395" but its the opening and closing timings i need ________________________________________ 309 GTi6-T
Posted 28th Dec 2010 at 21:40 Profile

cwspellowe Seasoned Pro Location: Calderbank Registered: 19 Jul 2009 Posts: 6,496 Status: Offline	Post #4 considering a cheeky regrind? ________________________________________ Bye bye Sundance Kid
Posted 29th Dec 2010 at 17:16 Profile

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. ________________________________________ 309 GTi6-T
Posted 29th Dec 2010 at 17:19 Profile

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

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