ARP head bolt tool????

[jdub]

dont know where you are getting your info , but i am right. do a little experiment. with a good torque wrench tighten a bolt to 100 ft-lb with a 12 " extension, then check it with the same setting on the same wrench without the extension. you will have to tighten it up at least a 1/8 of a turn to reach the same torque. i got my information in multiple places including machinist school. it is called torsional deflection. ever seen tire torque sticks.. this is how they work.

You are confusing torsional deflection (the angular deflection of a torsion shaft) with the amount of force (torque) applied at the bolt.

Torsional deflection of solid shaft can be expressed as:

θ = 32 L T / (G π D4) where:

θ = angular shaft deflection (radians)
L = length of shaft (mm, in)
G = modulus of rigidity (Mpa, psi)

Torque is a measure of rotational force, or how hard something is being twisted - torque as used on a bolt or nut is a circular force measured at the head of the torque wrench, center-line on the socket. An extension is simply an extension of the center-line, so there is little effect on the measurement. Force causes the deflection, not the other way around (deflection causing a change in force applied). Torsional deflection will induce a small measurement error, but it is less than 1% of the desired value on an extension greater than 12".

Sorry, but I'm getting my "info" from how it actually works, supported by the math - your "experience" does not trump the physics...I could care less what you think you were taught. Sounds like to me a case of the student (you) not understanding the subject matter

 

[VooDoo]

I know that I had to use a craftsman deep-well, shallow-wall 14mm on my studs. Are the bolt's different from the studs? AND I STILL HAD TO HAVE THE CAMS OUT!

 

[CyFi6]

ever seen tire torque sticks.. this is how they work.

Only reason torque sticks work is because of the hammering effect of impact guns, a torque stick on a breaker bar or ratchet would be useless. (they are pretty useless on impact guns as well, but thats besides the point)

 

[PROJECT N00b]

Anyways, it's not like the torque setting is always what you are going to get. At the shop (engine back shop) we always put it in between the req'd torque setting, i.e. a 1/4" flange bolt on a PW -229 req's 25-36in. lb of torque we put it in the middle (30.5in. lb) because the torque wrench is off by + or - 5%.

 

[Poodles]

Toyota has specific torque specs. That torque range spec drives me nuts (damn Miata is like that)

 

[PROJECT N00b]

The only reason I know this stuff, is because we have these things called CDC's which is our upgrade training. Our CDC's have everything from the tools, to the formulas, engines and the way they work. It's a lot of stuff to learn.

 

[fixitman04]

hmm.. master tech for ford, toyota, and nissan. and a industrial maintenance mechanic/machinist. 15yrs experience in the "real world". been through plenty of upgrade training sessions myself and spent countless hours talking to factory engineers from the tool manufacturers on the tools i use every day.
you can trust your ways on your car.... but i will do it the right way on mine.

1% makes for enough of an error that i wont do it. try my little demonstration for yourself. you will find that the actual torque is less than you thought. or dont , i dont really care! im not going to continue arguing with ya, il just shake my head and leave the room. you cant teach an idiot to read by hitting him with a book!

 

[jdub]

hmm.. master tech for ford, toyota, and nissan. and a industrial maintenance mechanic/machinist. 15yrs experience in the "real world". been through plenty of upgrade training sessions myself and spent countless hours talking to factory engineers from the tool manufacturers on the tools i use every day.
you can trust your ways on your car.... but i will do it the right way on mine.

1% makes for enough of an error that i wont do it. try my little demonstration for yourself. you will find that the actual torque is less than you thought. or dont , i dont really care! im not going to continue arguing with ya, il just shake my head and leave the room. you cant teach an idiot to read by hitting him with a book!

Yeah - It's the same thing that mechanics try to make out concerning motor oil. Myth, after myth, after myth gets passed along word of mouth until somehow it becomes fact...BS just keeps building on itself. Problem is it's never backed up with any data - the "experts" always just "shake my head and leave", spouting the same old crap. Just like you did here - imagine that.

Just to point something out: 1% of 100 ft/lbs of torque is 1 ft/lb. That's much less than the calibration tolerance for the wrench itself...your statement and little test just does not match reality and demonstrates zero analytical thought. I have an excellent idea - keep hitting yourself in the head with that book till some of it sinks in. I fear though that your skull may be a touch too thick, or maybe you just need to learn how to read.

I'm done too. After all, you never should argue with a moron...they just bring you down to their level and beat you with experience.
Hence the following:

Here's your problem: You are posting misinformation in the Tech Section. I was trying to be relatively civil about correcting you, but you had to pull the "I'm right because my vast experience says so" routine. Do not post in this thread again - what you have proved is your ignorance on this subject. I will not tolerate it, and I am not kidding.

 

[mk3tattoos]

thanks for all the feed back on the matter. there was some realy good info! sometimes you have to take people with a grain of salt