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28-10-2006, 02:58 PM
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Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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I just thought people may be intersted to know that the AU valve springs sit at an installed height of 41mm and when fully compressed to hard coil bind they are 27mm.The difference is 14mm according to my calculations.This means that the biggest cam to hit coil bind will be 551 inch lift.
Seeing that it gets solid coil bind at 551 lift then how big a cam can they handle safely? 540,530,520,510 500 lift?
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28-10-2006, 03:06 PM
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You can't stop the signal
Join Date: Nov 2005
Location: Behind a computer at work
Posts: 1,624
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Interesting stats and a good peice of info. make sure you take into account the rocker ratio as well
Cheers
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28-10-2006, 03:13 PM
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Smile
Join Date: Dec 2004
Location: Merrylands Sydney
Posts: 8,541
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I did.The rocker ratio on au's is 1.81. The coil bind was done in a vice.Installed height is from 2 reference manuals. I am thinking the dev 4 would like some stiffer springs or I may also supersize my cam.
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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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28-10-2006, 03:48 PM
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TL40 Wagon?
Join Date: Dec 2004
Location: Sydney
Posts: 2,377
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If we are talking valve lift and we are the stock AU springs will handle up to 530-540 lift but they will get float at high revs. Most modded cams will want to have springs with a higher seated pressure and pressure at full lift than stock and still avoid coil bind. Most mild cams with 480 lift will run with stock valve springs ok. when you get to 510 and above its worth revisiting more for the harder ramps these cams use to open up quick and seat fast.
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Coil bind in au six engine.
Linear Mode
