[DMCForum] Re: Angle Torque... what the hell?

["cruznmd" <racuti1@xxxxxxxxxxxx>]

I had the same initial confusion as you. I didn't "calculate"
anything. I called DMC and Warrensayz (my favorite word) torque 'em to
65 ft/lbs. Martin says 90 ft/lbs. I split the difference and went to
80. :-P

--- In DMCForum@xxxxxxxxxxxxxxx, Travis Goodwin <tgoodwin@xxxx> wrote:
> I should clarify my last question... Has anyone applied the angle
torque to
> their head bolts?
> 
> Rich, how about you?
> 
> > -----Original Message-----
> > From: Travis Goodwin [mailto:tgoodwin@xxxx]
> > Sent: Tuesday, July 22, 2003 2:01 PM
> > To: 'DMCForum@xxxxxxxxxxxxxxx'
> > Subject: RE: [DMCForum] Angle Torque... what the hell?
> > 
> > Why not just recalculate as a torque setting since it's still a
rotational
> > force? Has anyone actually done this as the manual suggests?
> > 
> > > -----Original Message-----
> > > From: timnagin [mailto:timnagin@xxxx]
> > > Sent: Tuesday, July 22, 2003 11:37 AM
> > > To: DMCForum@xxxxxxxxxxxxxxx
> > > Subject: RE: [DMCForum] Angle Torque... what the hell?
> > >
> > > This had me curious as well, so I found a few different
explanations...
> > >
> > > "This method, also known as turn of the nut method, was
introduced for
> > > manual assembly shortly after the second World War when a certain
> > > tightening
> > > angle was specified. The method has been applied for use with power
> > > wrenches, the bolt being tightened to a predetermined angle
beyond the
> > > elastic range and results in a small variation in the preload
due, in
> > > part,
> > > to the yield stress tolerance. The main disadvantages of this
method lie
> > > in
> > > the necessity for precise, and, if possible, experimental
determination
> > of
> > > the angle; also the fastener can only sustain a limited number of
> > > re-applications before it fails."
> > >
> > > http://www.boltscience.com/pages/tighten.htm
> > >
> > >
> > > "Sometimes when using old head bolts, and when using metal to
aluminum
> > > composite heads, etc., automotive manuals call for torque angle.
This
> > > simply
> > > means that after correctly torquing the head bolts to 85 ft.
lbs. (in
> > your
> > > case), turn the bolt another one eighth of a turn, as in 360 degrees
> > would
> > > be a complete circle.
> > >
> > > With today's more precise engineering practices, measurements in
> > > automotive
> > > components have become more critical. Exact clearance and torque
> > > specifications must be followed, otherwise, expensive automotive
> > > components
> > > will rapidly turn into scrap metal."
> > >
> > > http://www.geocities.com/Athens/Olympus/8947/QA13.htm
> > >
> > >
> > > The above example is not YOUR case, it is in the case of the person
> > asking
> > > the question on that page.
> > >
> > > Greg
> > >
> > >
> > > -----Original Message-----
> > > From: Travis Goodwin [mailto:tgoodwin@xxxx]
> > > Sent: Tuesday, July 22, 2003 10:47 AM
> > > To: 'DMCForum@xxxxxxxxxxxxxxx'
> > > Subject: RE: [DMCForum] Angle Torque... what the hell?
> > >
> > >
> > > Of course I don't. That's why I'm asking!
> > >
> > > It is angle torque. I'm looking at the manual for installing the
head
> > > bolts
> > > on the B28F. It says, and I quote:
> > >
> > > Angle torque cylinder head bolts
> > > 1. loosen all bolts in sequence
> > > 2. tighten all bolts 15-20 Nm in sequence
> > > 3. angle torque 113-117 degrees in sequence. Use protractor
5098. Use
> > > rocker
> > > arm shaft as a line of reference when torquing.
> > >
> > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem
<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2335536880>
&item=2335536880
> > >
> > >
> > >
> > >
> > > To unsubscribe from this group, send an email to:
> > > DMCForum-unsubscribe@xxxxxxxxxxxxxxx
> > >
> > >
> > >
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> > 
> > 
> > 
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