Re: Head bolts

Posted by Grub on June 13, 2007 at 14:58:10 from (71.193.244.151):

In Reply to: Head bolts posted by Farmall MD nut on June 13, 2007 at 14:40:46:

I think the biggest consideration is the tensile strength of the two materials. When you torque something, the goal is to stretch the fastener and the tensile strength of the fastener wants to pull it back together- that's where the "clamping pressure" comes from. The torque value on the F-12 be 90 ft. lbs and with the original bolt it would stretch say .030". Your replacement stainless fastener, if it has a higher tensile strength may only stretch .018" given the same torque. (Those numbers are for illustration only) Does that make sense?
Crucial also is turning all that torque from your wrench into clamping pressure. Any torque lost to friction with bad threads, paint, dry threads, etc. results in less clamping pressure (also known as preload).
How much are you going to increase the compression ratio?

Grub

Replies:

• Re: Head bolts Farmall MD nut 01:30:38 06/14/07 (0)

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