dougmeyer
Needs a job
moderated
Posts: 2713
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posted November 08, 2009 07:20 PM
Rocket,
What Tim is referring to is the fact that when you properly load a bolt or stud, you stretch it and the elasticity of the bolt is what keeps the parts clamped together. If the load trying to pull them apart is less than the clamping load of the bolt's stretch (as is should be), the bolt isn't effected. The stretching load caused by the dynamics of the piston reversing direction is, or always should be, less than that load, so it matters not.
And I didn't say it was greater, I just said the "work" the bolts are doing is more critical than the downward compressive load on the rod.
D,
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
  
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tcchin
Zone Head
Posts: 867
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posted November 08, 2009 07:35 PM
Sorry, Doug - it appears as though I mis-read your post. I completely skipped over the "other thread on this topic" bit and directly linked what you were saying about rods to what you were saying about cyclic loading and fatigue. My bad.
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entropy
Moderator
Posts: 8671
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posted November 08, 2009 10:57 PM
quote:
ent can you get jim to give you a bigger valve pocket to get your 102/102? that i think would loose less compression than lifting the head up with thicker gasket to try some time.
i don't mess with thicker gaskets bc i like the squish right where it is, i.e. real close to .030".
So to get more PTV, gotta either make deeper pockets in the pistons, or sink the seats.
i've done experiments on both methods and both have issues with my set up, so i'm staying with the 104/105 i am running now.
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