Stud Girdle

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02-20-2017, 09:27 AM

#61

adk61

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Quote:

Originally Posted by adk61

I have Jomar girdles for that application...[ATTACH=CONFIG]564874[/ATTACH][ATTACH=CONFIG]564875[/ATTACH] they sell for 329.00 per set and come complete with polylocks as seen

these are designed to fit the narrow rockers...

02-20-2017, 10:59 AM

#62

getrdunn

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Quote:

Originally Posted by ezstriper

I do not, but the fit perfect on std GM iron heads(running now) and used a set on std Darts a while back, both worked fine, now the adjuster nuts wont work on crane gold rockers without grinding, or getting thinner wall ones.

Kinda sucks I had two sets of crane golds ready to go. I've gotta look into those rockers rookie was talking about. I kinda figured I might have some issues with the crane rockers and girdle fitment unless I used crane girdles.

02-27-2017, 07:03 PM

#63

F-2 Speedy

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These guys make nice stuff

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02-27-2017, 08:56 PM

#64

Full Force

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They sure do...!! very nice product..
[ATTACH=CONFIG]565140[/ATTACH][ATTACH=CONFIG]565141[/ATTACH]

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02-01-2019, 10:41 AM

#65

Mohavvalley

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Quote:

Originally Posted by MILD THUNDER

something to consider. When ordering a set of girdles, make sure to ask what size base the included polylocks have. Some are .550, some are .600. You want them to match the rockers you are running. If you order a set that comes with .550 locks, and need .600 locks, the locks themselves are kinda pricey.

MT can you elaborate on this more, what exactly are we measuring to verify this?

When running these you put the regular poly locks on then the extended poly locks that go through the girdle go on top OR the extended poly locks replace the original poly locks?

02-01-2019, 11:09 AM

#66

F-2 Speedy

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Quote:

Originally Posted by Mohavvalley

most if not all girdle sets come with the long poly locks, ( two different lengths for intake and exhaust ) discard the old ones

Last edited by F-2 Speedy; 02-01-2019 at 11:11 AM.

07-11-2019, 10:50 AM

#67

NautiSouth

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Quote:

Originally Posted by ezstriper

this is one I have used twice, and as far as when needed, after talking to Bob M. at length I thinking starting at a 500hp would not be a bad idea..

http://www.ebay.com/itm/PROFORM-Big-...FXroAR&vxp=mtr

Horsepower is a poor metric to use to decide whether or not you need a stud girdle. Valvetrain loads are not a strong function of horsepower. The better metric to use would be RPM, modulated by how "aggressive" the cam profiles are. I should come up with my own recommendation and share it with the board. I'll need to do some analysis for that.

07-11-2019, 11:16 AM

#68

adk61

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many variables here, cam profile, length of valve/pushrod/geometry... the farther off the pedestal the rocker sits, the more deflection the stud sees at rpm, sometimes this is just where it needs to be for the working mechanism to be "happy" thus it becomes fundamental for the use of a girdle, or better yet a shaft rocker system if budget allows.
just my $.002

07-11-2019, 11:25 AM

#69

MILD THUNDER

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I measured deflection of the stud , just rolling the engine over by hand against spring pressure, it was eye opening. Now imagine the exhaust valve, that not only has to overcome spring pressure, but also has to overcome extremely high cylinder pressure to open.

07-11-2019, 02:39 PM

#70

NautiSouth

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Quote:

Originally Posted by adk61

I totally agree that a shaft rocker system is the way to go, But someone should quantify just how much better it is versus a stud girdle. Maybe I could perform that FEA one day to see how effective stud girdles are, then follow that up with a dynamic analysis of its effect on valve motion. It sure would be interesting.

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