Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[skippy49]

Does anyone know the valve seat pressure with the springs that come stock with the CVO heads?  The particular bike I'm interested in, if it makes a difference, is the 03 SERK. I'm thinking of switching to a different cam that suggests 160# seat pressure but I don't know what the stock setup is.  Also what is the maximum lift allowed with the stock springs, if anyone's measured?
Thanks for any help.
Hopefully I'll get into this yet this week.
Steve

[kng103]

Does anyone know the valve seat pressure with the springs that come stock with the CVO heads?

[electraglidese]

I was told by my local dealer that our cvo valve springs will handle .575 lift. If you haven't looked at Bob Woods cams check out his web site and look at the TW5g a real torq monster. Plus some of the guys on these forums claim the TW5g Gear Drive is not as noisy, more torq than HP on dynos.

[skippy49]

I hadn't looked at that cam, but I have read several places that woods cams are noisy.  What's the opinion about the noise?  I may call Bob anyway and see what he says.
   I'd still like to know the stock spring seat pressure if anyone knows.  If not I'll give the moco a call as suggested.

It'd be nice to use a bolt in cam-sure would save me some work, but I don't think I can wait until Zippers comes out with their new 575, due to my work schedule.  There's just too many cam choices out there-everytime I think I get it narrowed down, someone gives me another one to look at-and then the new one looks good! [smiley=nixweiss.gif]

[HUBBARD]

Yeah, 'er 'uh, skippy49,
  I think your stock valve seat pressure is between 100 & 120 #.  I may not be exactly right, but I'm close.  Later--HUBBARD  

[SPIDERMAN]

Hubbard
             In a perfect world isn't the seat pressure a factor of the cam profile ? I mean you wouldn't want 120lbs on a .650 lift nor would you want 180lbs on a 530 lift - - - correct ?

Big B

[grc]

Does anyone know the valve seat pressure with the springs that come stock with the CVO heads?

[skippy49]

The parts manual for my 03 SERK list the springs as #18272-00, but I can't find that # anywhere, that's why I was wondering if anyone knew what they were.  I may call the dealer and see if they know what spring it is.
   I'm guessing that the #18273-00 is the same as the spring I have, only it includes the upper and lower collars and keepers, whereas my number is only the springs themselves and the collars and keepers have separate part numbers in the book.  Don't know for sure, but I'd bet on it.
Steve

[HUBBARD]

Hubbard
             In a perfect world isn't the seat pressure a factor of the cam profile ? I mean you wouldn't want 120lbs on a .650 lift nor would you want 180lbs on a 530 lift - - - correct ?

Big B

Yeah, 'er 'uh, shippy49,
  That's exactly right.  For example, Ol' Maudie has RedShift 647 Gear Drive Cams.  .647 Lift, .264 Duration.  Valve Seat Pressure on mine is 200 lbs.  Later--HUBBARD  

[skippy49]

Yeah, 'er 'uh, shippy49,
  That's exactly right.  For example, Ol' Maudie has RedShift 647 Gear Drive Cams.  .647 Lift, .264 Duration.  Valve Seat Pressure on mine is 200 lbs.  Later--HUBBARD  

Valve seat pressure is measured at an installed height.  Specific springs have a specific seat pressure at a specific installed height.  I'm just trying to find out what is the seat pressure at the installed height of the stock springs in a CVO 103.  If the springs are the ones that I think they are in the SE catalog, then I know the seat pressure and installed height.  It doesn't necessarily mean that I'm going to use them with the cam I use.  But it will help determine if they can be used with a different cam that has specific requirements for springs.
  I'm guessing they are the same as the set in the catalog with the 18273#, but I may call the dealer to see if they know for sure, and they probably don't.

[HUBBARD]

Valve seat pressure is measured at an installed height.

[skippy49]

I'll try him tomorrow and see what he says.

[HUBBARD]

I'll try him tomorrow and see what he says.

Yeah, 'er 'uh, skippy49,
  Did you get up with Neal?  Please advise.  Later--HUBBARD

[skippy49]

Hubbard:
   I talked to Neil today and he wasn't sure about the springs on our heads.  He said that most of the harley springs were actually less than what Harley advertised them at and, most likely, the springs in our heads would test out at around 100-120#.
   I'm going to see if my local machine shop can measure seat pressure and get them checked.  If they can't, I'll just put some new ones in.
Steve

[syclone]

100-120 lbs closed at installed height would really be a surprize (not that low).