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Username Post: Valve spring bind        (Topic#359588)
sting199 
Newbie
Posts: 22

Reg: 12-12-19
01-25-20 12:26 PM - Post#2785148    

Firstly,,,got to say the help in this site has been super. THANKS EVERYONE!!!! Got a set of heads with upgraded springs (duel) and trying to figure max lift on the springs, to upgrade the cam (naturally). Got the coil bind about at .675, at room temp. Now, some Ebayers only leave .050 from max lift to coil bind. I am not keen on this, would like at least .100, and not sure how much more for heat expansion. What would be a safe max lift for these springs? Thanks!



 


Shepherd 
Frequent Contributor
Posts: 1967

Loc: Lake George, NY
Reg: 11-11-15
01-25-20 01:55 PM - Post#2785150    
    In response to sting199

.060 is the industry safe margin, also watch out for clearance from the top of the valve guide to the bottom of the retainer. Of course if you push it to valve float, that could cause problems.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17447
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
01-25-20 02:00 PM - Post#2785151    
    In response to sting199

read the linked info, and sub links, for a great deal ,more related info

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...






IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 01-31-20 06:54 AM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 1967

Loc: Lake George, NY
Reg: 11-11-15
01-25-20 02:23 PM - Post#2785152    
    In response to grumpyvette

Usual thorough stuff from the "Grump".



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1223
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
01-25-20 05:14 PM - Post#2785168    
    In response to Shepherd

What is the shortest answer to this issue?


VC56S 2 door Sedan, 39 Years



 
Rick_L 
Member #409
Posts: 27685
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-25-20 06:55 PM - Post#2785174    
    In response to Bad56Sedan

Look at the charts/diagrams above.



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1223
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
01-30-20 04:25 PM - Post#2785481    
    In response to Rick_L

I guess I just don't see it.
My password at grumpy's sight don't work,
That's why I asked,
Thanks

VC56S 2 door Sedan, 39 Years



 
Rick_L 
Member #409
Posts: 27685
Rick_L
Loc: Katy, Tx, USA
Reg: 07-06-00
01-30-20 06:08 PM - Post#2785492    
    In response to Bad56Sedan

You don't need grumpyvette's site. The diagrams are in the posts here.



 
Shepherd 
Frequent Contributor
Posts: 1967

Loc: Lake George, NY
Reg: 11-11-15
01-30-20 06:33 PM - Post#2785494    
    In response to Bad56Sedan

What more do you need in addition to my or Grump's post?



 
Bad56Sedan 
"13th Year" Gold Supporting Member
Posts: 1223
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
01-30-20 07:44 PM - Post#2785498    
    In response to Shepherd

Unfortunately, I don't see what you would need to do to solve the issue.
I see the diagrams but, I just don't see what you would do to gain clearance between the spring coils.
I guess I'm looking for something like,
" you cut the valve guides down"
"You cut the spring seats down"
That's all, just asking

VC56S 2 door Sedan, 39 Years



Edited by Bad56Sedan on 01-30-20 07:50 PM. Reason for edit: No reason given.

 
Shepherd 
Frequent Contributor
Posts: 1967

Loc: Lake George, NY
Reg: 11-11-15
01-31-20 06:42 AM - Post#2785515    
    In response to Bad56Sedan

Correct, given a certain valve spring that is what would be required to get the required clearances.



 
grumpyvette 
Senior Chevytalk Moderator -- Performance Subject Matter Expert --
Posts: 17447
grumpyvette
Age: 72
Loc: FLORIDA USA
Reg: 03-16-01
01-31-20 06:50 AM - Post#2785516    
    In response to Shepherd

both offset retainers and offset valve locks exist that will each allow .050 added height,or clearance, but be aware added space reduces the valve spring pressure , yes its very common for a cam with increased lift to require both the valve guide and spring seats to be machined and new valve seals and valve springs and retainers to be installed

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...


http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

http://garage.grumpysperformance.com/index.php?thr...

IF YOU CAN,T SMOKE THE TIRES AT WILL,FROM A 60 MPH ROLLING START YOUR ENGINE NEEDS MORE WORK!!"!
IF YOU CAN , YOU NEED BETTER TIRES AND YOUR SUSPENSION NEEDS MORE WORK!!


Edited by grumpyvette on 01-31-20 07:16 AM. Reason for edit: No reason given.

 
65_Impala 
Very Senior Member
Posts: 4408

Reg: 12-29-02
01-31-20 07:28 AM - Post#2785519    
    In response to Bad56Sedan

No-one has pointed out that keeping a valve spring out of coil bind isn't the only criteria that determines it's suitability with a certain cam. The seat and open pressures also have to be suitable for the cam.


Bad56Sedan - What you can do depends on what the issue is. You can cut the valve guides shorter if that's causing the issue. Sometimes, cut the seats and use different springs. Sometimes different retainers as Grumpy posted. It just depends.

http://www.engineprofessional.com/articles/EPQ215_...





 


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