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Title: coil bind Post by: henk on March 25, 2012, 19:38:05 pm hallo,
the heads and rockers went on my engine today,but it seems like it has coil bind. what is the best way to solve this probleme from coil bind? whitout changing the cam off course. the cam is an FK-10 and the rockers are 1.4 scats can i do some modification on the heads or so to solve this? henk!!! Title: Re: coil bind Post by: Bruce on March 25, 2012, 19:45:18 pm Longer valves.
Bore the pockets for the springs deeper. Shorten the springs. Taller retainers. Title: Re: coil bind Post by: tezer on March 25, 2012, 19:52:21 pm what brand springs you have?
i had to get cb vw650 to fix my coil bind problem! Title: Re: coil bind Post by: Chris bugster on March 26, 2012, 13:23:59 pm Yes indeed, Mr Tezer is correct. A set of Scat 1.4s I have lifts close to 1.5 and with an FK10 I had I ended up with almost .600 lift, which is far too much for the dual spring setup found on most performance heads and so one option is to use the CB 650 springs or those from JPM.
Title: Re: coil bind Post by: henk on March 28, 2012, 09:46:47 am ok thanks guys,
it seems indeed that it would work with the CB 650 springs. i'm also gonna have to machine the titanium retainers a bit down as these are touching the valve guides. don't think this wil be a probleme,only have to shave of 3mm? henk!!! Title: Re: coil bind Post by: ibg on March 28, 2012, 13:38:30 pm Machine the valve guides not the retainers. A couple of mm off a guide is nothing, 2 mm off a retainer is lots. you run the risk of the retainer pulling through. :o
Title: Re: coil bind Post by: Big Power on March 29, 2012, 16:05:07 pm You really need to install some "checking" springs and find out what your total lift is. You then need to check your installed height. The vw 650 spring with a retainer that has a .100 outer spring step will coil bind at .850. You need at least .050 before coil bind.
Title: Re: coil bind Post by: Udo on March 29, 2012, 17:36:14 pm I would also change to the CB springs and different rockers. Scats have different ratio in one set. From 1,3-1,5 . But it sounds like you have to grind the spring seat too. Watch for breaking through in the intake port
Udo Title: Re: coil bind Post by: henk on March 30, 2012, 09:58:40 am ok guys,
thanks for all the info. i orderd the CB650 springs and see if this will solve the probleme. also gonna machine down the valve guides instead of machining the retainers. let you know how it goes. henk!!! Title: Re: coil bind Post by: Udo on March 30, 2012, 17:45:56 pm order the retainer with the springs ... That should give you more room
Udo Title: Re: coil bind Post by: henk on April 06, 2012, 21:00:19 pm ok,springs are in and the valve guides are trimmed down 2mm.
everything clears now and i have no coil bind anymore. it really starts to look like an engine now. :) henk!!! Title: Re: coil bind Post by: Fiatdude on April 07, 2012, 00:05:23 am No it doesn't -- at least until a turbo is installed ;D ;D ;D
Title: Re: coil bind Post by: TexasTom on April 07, 2012, 00:35:09 am No it doesn't -- at least until a turbo is installed ;D ;D ;D When you put those on all you can see is the hairdrier or tubing ... blocks the view of simplistic beauty. Looks Great, Henk! TxT Title: Re: coil bind Post by: henk on April 08, 2012, 11:45:40 am thanks,
had a LOT of help ont it from a friend(Steve) with that engine. henk!!! Title: Re: coil bind Post by: Fiatdude on April 09, 2012, 02:17:45 am No it doesn't -- at least until a turbo is installed ;D ;D ;D blocks the view of simplistic beauty.Looks Great, Henk! TxT Com'on how does all this block the beauty ::) ::) ;D ;D (http://i586.photobucket.com/albums/ss306/Fiatdude/2011-5-31.jpg) But it does look great Henk Title: Re: coil bind Post by: Jim Ratto on April 09, 2012, 05:04:43 am ok,springs are in and the valve guides are trimmed down 2mm. Nice lookingeverything clears now and i have no coil bind anymore. it really starts to look like an engine now. :) henk!!! what travel do you have between full lift and coil bind now? Title: Re: coil bind Post by: Fasterbrit on April 09, 2012, 10:12:29 am Great turbo install 8)
Your air filter will be picking up a lot of heat though; reducing your intercooler's efficiency somewhat. Some extra hp to be had by a simple relocation ;) Title: Re: coil bind Post by: m.o.t on April 09, 2012, 12:50:11 pm Quote what travel do you have between full lift and coil bind now? aprox. 1,8mm... steve |