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07-05-2007, 02:47 PM
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FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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i want to put the cam back in my i6 now and i'm a bit unsure of how the stock valve springs will handle it.
i measured up the cam and it has 480 thou lift at the valve ,both intake and exhaust.according to my hanes manual an xr6 hp should have around 478 thou lift at the valve on the intake side and 455 on the exhaust a standard au cam roughly 444 intake and 475 ex. so i'm thinking the valve springs will handle the lift alright.my question is how much effect dose the duration of a cam have on the valve springs? i have no way of trying to measure the duration on this cam.but to look at side by side with a standard cam ,you can see by the lobes it has a lot more duration than a standard au cam.
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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07-05-2007, 02:53 PM
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What Wheelspin?
Join Date: May 2005
Location: Victoria
Posts: 2,378
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standards will handle it fine.
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2016 FGX XR8 (KPM StreetFighter Kit 455rwkw) 2003 BA Xr6 Turbo (Atomic Long, DTM auto, Nizpro stage2 kit, eaton truetrac, E85, HeadsexTuned) |
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07-05-2007, 06:17 PM
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#3 | ||
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...
Join Date: Apr 2005
Location: Geelong
Posts: 1,407
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No one on here can say there alright cos if your car has done a lot of kays theres a good chance they are not the best!! Who knows what condition your motors in.
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07-05-2007, 07:20 PM
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#4 | ||
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FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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its a wreckers donk thats done 66k
i was more interested in how much duration on the cam effects the load on the valve springs . i'm confident the springs will handle the lift ,but duration?
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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07-05-2007, 10:38 PM
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#5 | ||
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Back on the road
Join Date: Dec 2004
Location: Wollongong, NSW
Posts: 3,205
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You've got the right idea. Its not about the duration so much as the max rate at which the lobe accelerates and then decelerates the valve (and the rest of the valvetrain...rocker etc...)
Given the head is otherwise std, best bet would be to take the recommendation of the cam grinder. Too little valve spring pressure is a very bad thing.
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------------------------------------------------------------------------- AU XR8 Ute 13.90 @ 100mph - http://www.aufalcon.com/xr8ute 5L Windsor, GT40X heads, Crane 2030, Pacey 4-1s, Lukey 3", 3.91:1, auto. Tuned by me w/Quarterhorse and BinaryEditor. Coming Soon: Ported lower intake, Tickford "Premium" Brakes, and a good wash. |
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08-05-2007, 09:18 AM
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#6 | ||
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___________
Join Date: Jan 2005
Posts: 611
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I am running the following cam in my car with standard springs on an AU S1 forte, the car has seen 5800rpm without a worry.
CROW 2232526 IN.20/66 EX.70/16 265 265 197 197 .476" .454" 900 3500 High Torque cam to suit. AU series 1. Not for VCT or XR6 |
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08-05-2007, 01:11 PM
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#7 | ||
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FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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thanks for the input guys.i think i will put it in and see how it go's
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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08-05-2007, 02:24 PM
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#8 | ||
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___________
Join Date: Jan 2005
Posts: 611
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What cam do you want to put in? its non standard cam right?
If so be carefull and maybe crank the engine over by hand before you start it, to check for clearences. |
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08-05-2007, 07:10 PM
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#9 | |||
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FF.Com.Au Hardcore
Join Date: Apr 2006
Posts: 784
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Quote:
better to safe then sorry
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au2 s i6 5 spd , au series 1 xr6 hp motor, cam advanced 5*,jmm cai ,topgun leads,pacey 4480's,3 inch cat,lukey 2 1/2 sports zorst and 3.89 lsd,standard ecu. current best,14.939 @ 93.17. |
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09-05-2007, 03:51 AM
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#10 | ||
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Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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The standard valve springs will take 510 lift leaving 40 thou clearance to coil bind.However they seem to run 520 thou lift on many cars and I have heard no problems
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Stingray Car Security ph 0414445444 Single din radio fascias for fg to fgx fords Australia wide . FG 1 2 and 3 gauge holder in stock now! https://stingraycar.com.au/shop/ Site Sponsor See Sponsor Stingray Car Security 😍👌✌ AU wagon 6 14.241@96.75 1/4 mile sold.Octane fg xr6 turbo!! 12.312 112.21 mph home tune f6 injectors gone ..now in nitro fgxr6t ready to go again 
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i6 valve srings ????
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