Coil bind
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Coil bind
Springs coil bind @1.100
I set up as follows:
Intakes install @ 1.910 = .760 lift
Ex install @1.870 =.720 lift lash .022 both sides.
Between lash and deflection I don't sweat it........
What are your experiences?
I set up as follows:
Intakes install @ 1.910 = .760 lift
Ex install @1.870 =.720 lift lash .022 both sides.
Between lash and deflection I don't sweat it........
What are your experiences?
modified wanna be
Re: Coil bind
Things have changed. Some old-tech springs would fail if run that close to coil bind. Some springs today are designed to run with the bottom coils stacking every cycle.
Jack Vines
Studebaker-Packard V8 Limited
Obsolete Engineering
Studebaker-Packard V8 Limited
Obsolete Engineering
Re: Coil bind
So you're running ~.070" coil bind clearance?
On higher end stuff, I'll usually aim for .050-.060" coil bind clearance, with lash figured in.
One thing I have noted, never trust the coil bind dimension given by the spring manufacturer. Some are off by .060" or more.
On higher end stuff, I'll usually aim for .050-.060" coil bind clearance, with lash figured in.
One thing I have noted, never trust the coil bind dimension given by the spring manufacturer. Some are off by .060" or more.
Lykins Motorsports
brent@lykinsmotorsports.com
www.lykinsmotorsports.com
www.customfordcams.com
Custom Ford Windsor, Cleveland, and FE Street/Race Engines
brent@lykinsmotorsports.com
www.lykinsmotorsports.com
www.customfordcams.com
Custom Ford Windsor, Cleveland, and FE Street/Race Engines
- needforspeed66gt
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Re: Coil bind
This.blykins wrote: ↑Mon Aug 13, 2018 2:59 pm So you're running ~.070" coil bind clearance?
On higher end stuff, I'll usually aim for .050-.060" coil bind clearance, with lash figured in.
One thing I have noted, never trust the coil bind dimension given by the spring manufacturer. Some are off by .060" or more.
Nate @steeldustmachine
Engine Machinist
Engine Machinist
Re: Coil bind
You will need to verify the coil bind height with a retainer fitted to the spring. That way you can be certain of your figures.
- af2
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Re: Coil bind
That!needforspeed66gt wrote: ↑Mon Aug 13, 2018 3:47 pmThis.blykins wrote: ↑Mon Aug 13, 2018 2:59 pm So you're running ~.070" coil bind clearance?
On higher end stuff, I'll usually aim for .050-.060" coil bind clearance, with lash figured in.
One thing I have noted, never trust the coil bind dimension given by the spring manufacturer. Some are off by .060" or more.
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Adam
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Re: Coil bind
YES ... don't rely on what the printed specs tell you. That figure is usually a nominal figure where some are actually a bit less and some are a bit more. SO, check every spring separately.
http://www.rmcompetition.com
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Specialty engine building at its finest.
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Re: Coil bind
You guys are correct. The 1.100 "claimed" was actually 1.040 on at least everything I've checked so far. Now the question to answer will be how consistent are they from batch to batch........Now I'm beginning to realize I could have set them up a little tighter.
Steel valves , 8800 RPM............
Steel valves , 8800 RPM............
modified wanna be
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Re: Coil bind
Nobody is concerned about spring stress limits, just setting the spring close to coilbind?
In some situations it might make sense to think also durability if build is not plain drag race car where failure does not matter.
In some situations it might make sense to think also durability if build is not plain drag race car where failure does not matter.
Re: Coil bind
Springs last longer if they're closer to coil bind.
Lykins Motorsports
brent@lykinsmotorsports.com
www.lykinsmotorsports.com
www.customfordcams.com
Custom Ford Windsor, Cleveland, and FE Street/Race Engines
brent@lykinsmotorsports.com
www.lykinsmotorsports.com
www.customfordcams.com
Custom Ford Windsor, Cleveland, and FE Street/Race Engines
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Re: Coil bind
Valvetrain parts in general last longer with Titanium valves, etc. lighter stuff. Mark H.
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Re: Coil bind
Not completely true.
Valve springs last longer when they are not run in continuous distress mode.
If the spring does not see distress while working, it can be run at almost any height and coil spacing.
It can help springs run on the edge of distress to get close to coil bind in order to remove a lot of surge and help damping.
http://www.rmcompetition.com
Specialty engine building at its finest.
Specialty engine building at its finest.
Re: Coil bind
All of the above and check each spring. The coil bind will vary from spring to spring sometimes.
Re: Coil bind
Because the listed compressed height of most recent design quality springs is usually ~ 0.060" from the spec coil bind height, one could be excused for assuming the resulting stress at coil bind will not cause failure or rapid load loss.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.