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henk
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Joined: June 28, 2006
Posts: 40
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 Posted: Sun Mar 25, 2012 11:38 am Post subject: coil bind SOLVED now lifters failed!!!!! |
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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!!!
Last edited by henk on Wed Apr 25, 2012 1:45 pm; edited 1 time in total |
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UK Luke 72
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Location: Little Britain
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| Posted: Sun Mar 25, 2012 11:43 am Post subject: |
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| machine the spring seats or fit longer valves |
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runamoc 
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Location: 37.54N 77.18W
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| Posted: Mon Mar 26, 2012 6:48 am Post subject: Re: coil bind |
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| henk wrote: | 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!!! |
No sure, but maybe that cam isn't for use with 1.4 rockers.
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ALB
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| Posted: Mon Mar 26, 2012 9:04 am Post subject: |
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The FK10 is designed for 1.4 rockers. Don't try to machine the heads to lower the spring seat height; you'll probably cut through the little bumps in the intake ports. Are you getting coil bind or are the retainers hitting the tops of the guides? They usually have to be clearanced for dual springs and that much lift. Also, some retainers allow more lift than others.
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henk
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Joined: June 28, 2006
Posts: 40
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| Posted: Wed Mar 28, 2012 1:56 am Post subject: |
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| ALB wrote: | | The FK10 is designed for 1.4 rockers. Don't try to machine the heads to lower the spring seat height; you'll probably cut through the little bumps in the intake ports. Are you getting coil bind or are the retainers hitting the tops of the guides? They usually have to be clearanced for dual springs and that much lift. Also, some retainers allow more lift than others. |
hallo,
it looks like we have both of them coil bind and the retainers are touching the valve guides.
i'm going to change the springs that are in it now to CB650.
and also machine down the retainers 3mm so that they clear the valve guides.
henk!!! |
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yamaducci
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| Posted: Wed Mar 28, 2012 5:21 am Post subject: |
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Normally it is the valve guides that are clearanced not the retainer to solve that issue. Are you running too many shims under the springs by chance?
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henk
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Joined: June 28, 2006
Posts: 40
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| Posted: Fri Mar 30, 2012 2:03 am Post subject: |
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hallo,
ok thanks fot that.
we gonna trim down the valve guides instead.
henk!!! |
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henk
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Posts: 40
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| Posted: Fri Apr 06, 2012 1:04 pm Post subject: |
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ok,new springs are in and the valve guides are shortend 2mm.
everything seems to work well now.
henk!!! |
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henk
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Posts: 40
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| Posted: Wed Apr 25, 2012 1:49 pm Post subject: |
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after 10min. of running the engine starts to make some noise.
we checked the valve clearance and this big.
we adjust the clearence and fired it up again,same again and this time the lash cap came even uf the valve.
here is the result two lifters gone.
henk!!!
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jfats808
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| Posted: Wed Apr 25, 2012 2:01 pm Post subject: |
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At full lift did you have adequate clearance of your spring clearance? Some valves have different set hieghts when installed. That's probably where hit. Alternate cause is not enough cam to lifter clearance. Cb650 are really stiff springs too. Ouch.
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john@aircoo[email protected]
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| Posted: Wed Apr 25, 2012 4:38 pm Post subject: |
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it's very possible the lifter cracked when the retainers hit the guides before, and the failure completed after reassembly.
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mightymouse
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Location: las vegas
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| Posted: Wed Apr 25, 2012 7:08 pm Post subject: |
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^^^^ this.
Need to do it all again, check lifter head to case clearance when assembling, then assemble and check for bind and all other clearances.
Those lifter heads broke awful bad. Never seen that before. 
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Last edited by mightymouse on Thu Apr 26, 2012 2:11 pm; edited 1 time in total |
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henk
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| Posted: Thu Apr 26, 2012 1:28 am Post subject: |
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all clearences were fine when we installed the new springs.
@John,so you mean that this could be happend then just by turning it over by hand,that it had a some damadge and got destroyed when we fired it up?
henk!!! |
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Alstrup
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| Posted: Thu Apr 26, 2012 2:42 am Post subject: |
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| [email protected] wrote: | | it's very possible the lifter cracked when the retainers hit the guides before, and the failure completed after reassembly. |
Ditto that. If the lifter was damaged under trial and error, it will destroy itself fast during start up.
That is not the problem to this failiure, but you need to have 2,5 mm retainer to guide clearance and also min. 2,5 mm to coil bind. Lifter height clearance should also be at least 2 mm. I prefer 2,5 mm.
That is the "slack" it needs to have when tings are busy.
T |
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tommiebsmith
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Location: AUSTIN
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| Posted: Fri Apr 27, 2012 10:02 am Post subject: |
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Started break in with both springs in place.. got ten minutes on motor and the "good" lifters look like that??
I also read COIL BIND up top ??? was that ever addressed? other than cutting 2mm from the seat.
.539 ish with 1.4s shouldn't cause that much problems?
was addressing proper push rod length ever verified?
these are just me sitting here in Texas questions? |
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mark tucker
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| Posted: Fri Apr 27, 2012 11:16 am Post subject: |
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| my fk8 (.382 lobe lift) was over .580 lift with "1.4" rockers that checked over a 1.56 with another cam.just going by what is printed and what is thought along with a caluclator can ,will,and has killed a lot of parts.always check for your self just how much lift there realy is with all combinations&configurations. |
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Pat D
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| Posted: Fri Apr 27, 2012 12:47 pm Post subject: |
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What brand lifters are they? The newer Engle cams use the harder chilled iron cam billet. Not all lifters on the market are hard enough for these cams.
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VIN
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| Posted: Fri Apr 27, 2012 2:55 pm Post subject: |
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| Pat D wrote: | | What brand lifters are they? The newer Engle cams use the harder chilled iron cam billet. Not all lifters on the market are hard enough for these cams. |
are your lightweight racing lifters hard enough?
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stevet4
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| Posted: Sat Apr 28, 2012 2:39 am Post subject: lifters |
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Full lift @the valve 14,5mm(0.570)...... scat 1,48 rockers
Retainer to guide clearance @full lift 1.5mm(0.059)
lifter to bore clearance @ full lift 2mm(0.078)
coilbind @full lift 1.9mm(0.074)
should we get more clearance? |
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andy198712
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Location: Cornwall - UK
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| Posted: Sat Apr 28, 2012 3:48 am Post subject: |
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| VIN wrote: | | Pat D wrote: | | What brand lifters are they? The newer Engle cams use the harder chilled iron cam billet. Not all lifters on the market are hard enough for these cams. |
are your lightweight racing lifters hard enough? |
Put a guy in a tough spot!! |
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