On Sep 12, 5:13 pm, klu...@[EMAIL PROTECTED]
(Scott Dorsey) wrote:
> hls <h...@[EMAIL PROTECTED]
> wrote:
> >"C. E. White" <cewhi...@[EMAIL PROTECTED]
> wrote in message This is
done
> >using specialized machines
> >> that sense a change in the stress strain relation****p as the bolt
reaches
> >> the yield point. This is a very good way to torque bolts for variable
> >> loads, but difficult to duplicate in a repair environment.
>
> >I have seen bolt elongation gauges advertised and recommended for
> >performance
> >engine building. They are not so expensive.
>
> >I have never used one of them, and wonder if anyone here has any
comments on
> >them.
>
> We use them on airplanes. They are much more accurate than torque
gauges
> because they don't rely on thread friction.
>
> They would seem overkill for auto applications, but more im****tantly
they
> would seem useless because the numbers in the engine manuals are all
torque
> specs rather than elongation specs. So you'd have to develop your own
> nominal values for reference, which is probably fine for a one-off
engine
> that is being constantly rebuilt but otherwise impractical.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."
I think that is where they are most often used, in race or race/street
engines where the stock specs don't even apply anymore. I think that
ARP will give you stretch specs for their fasteners if you ask.
nate
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