Coil Bind
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Coil Bind

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    21 Daytona Outlaw's Avatar
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    Default Coil Bind

    can someone tell me the correct way to check for coil bind
    on valve springs?

    BBC roller cam, solid roller lifters, 1.7 ratio rockers
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    steelcomp was here
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    Quote Originally Posted by Outlaw View Post
    can someone tell me the correct way to check for coil bind
    on valve springs?

    BBC roller cam, solid roller lifters, 1.7 ratio rockers
    The best way is on a spring checker or in a vise. Put a retainer on the spring and compress it until it won't go any further. If you're running dual springs, make sure the inner spring is there. When compressed, measure the stack. That's your coil bind dimension. You can subtract that from your net lift and installed height and get your clearance. If the engine is assembled, you can just run the valve to max lift, and if you can see daylight through the coils, you're good.
    OK...maybe that's oversimplifying things, but seriously, you can check between the coils with a feeler gauge. If you know the specs for the spring, and you can measure the lift, you can do it mathematically, but measuring it is best.
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    the engine is assembled, and no daylight between the coils
    whats the next step? should this have been checked mathematically
    by the engine builder? does this mean I have the incorrect springs for the cam?
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    Quote Originally Posted by Outlaw View Post
    the engine is assembled, and no daylight between the coils
    whats the next step? should this have been checked mathematically
    by the engine builder? does this mean I have the incorrect springs for the cam?
    It could be as simple as not enough installed height, but this sort of opens a can of worms.
    I'd ask about valve lash, but at this point, even if you don't have any, it's not going to be enough to help.
    What kind of info can you give? Spring part no? Lift, rocker ratio, installed height, spring specs, anything else?
    If God is your co-pilot, change seats!
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    steelcomp was here
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    By the way, you probably already know, but STOP WHERE YOU ARE! Don't continue rolling the engine over, and surely don't run it, or you can damge things.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.
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    Installed height minus full bind height is the max spring travel. That number needs to be at least .060 (some say.050, we like a bit more) greater than the max lift of the valve.
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    steelcomp was here
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    Coil bind is pretty basic. If overlooked, a lot of other problems can get blamed, when all along, coil bind was the culprit. Broken parts, unnecessary dmage, and blaming others for an unnecessary mistake. Let's try and avoid that if we can.
    Last edited by scott foxwell; 09-02-2008 at 07:54 PM.
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    Quote Originally Posted by Outlaw View Post
    the engine is assembled, and no daylight between the coils
    whats the next step? should this have been checked mathematically
    by the engine builder? does this mean I have the incorrect springs for the cam?

    Its very possible that to make what ever spring pressure you needed, the spring had to be shimmed too much which took away some of your travel. Then you would need a stronger spring or longer spring to start with
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    not my engine, I was contacted for advice. I will try and get more info.
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    Quote Originally Posted by Outlaw View Post
    not my engine, I was contacted for advice. I will try and get more info.
    Maybe it's the wrong retainer?
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.
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    Quote Originally Posted by Outlaw View Post
    can someone tell me the correct way to check for coil bind
    on valve springs?

    BBC roller cam, solid roller lifters, 1.7 ratio rockers
    During pre-assembly of the heads coil bind needs to be checked.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW
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    I was told the more space between the coils, the longer the springs will last. I've got .800 lift and I can use a ruler to measure mine. These were set up by Brodix in 03. No problems yet.

    Tim
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    Quote Originally Posted by cstraub View Post
    During pre-assembly of the heads coil bind needs to be checked.
    ONe would expect that even the most novice engine buider would know to check for coil bind, especially if he was having valve train problems.
    If God is your co-pilot, change seats!
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    Quote Originally Posted by River Rat 005 View Post
    I was told the more space between the coils, the longer the springs will last. I've got .800 lift and I can use a ruler to measure mine. These were set up by Brodix in 03. No problems yet.

    Tim
    Springs should be set up to run as close to coil bind as possible, as close as .030" in some cases. Not recommending that but .060-.080 is good. The further from coil bind they are, the more oscillation and instability there is in the spring, which can lead to spring fatigue and/or failure.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.
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