RE: scirocco-L-digest V1 #1932

["Fry, Larry" <LEF@chem-tronics.com>]

Brian-
  I inadvertantly left out a key word in my original post, that word being
"not".  The clutch bolts aren't TTY bolts, therefore they SHOULD be suitable
for re-use.  Which brings this anal engineer ...Scott...:).. to this
question:
  Why TTY bolts??  Why use bolts that are operating at 100% of their
strength (no safety factor) when a slightly larger bolt could be used to
apply the same clamping force at 75% of their capacity?  The only advantage
I can see to TTY bolts is a VERY slight weight savings and, come on, is
saving two ounces on head bolts important?  I should be asking this question
of the design engineers, but since I don't have access to them, I'm asking
you guys.  Anyone know the answers here?

Larry  sandiego16V


-----Original Message-----
From: Brian Wagner [mailto:scirocco_88_16v@hotmail.com]
Sent: Tuesday, October 30, 2001 11:02 AM
To: Fry, Larry; aa821@acorn.net; scirocco-l@scirocco.org
Subject: RE: scirocco-L-digest V1 #1932


If they are a stretch or a Torque to Yield bolt it is not advisable to reuse

them. After you have applied the initial load to the bolt and then remove 
them the bolt has a different tensile yield pattern. As explained below

Torque-to-Yield Bolts

One-time-use, or torque-to-yield (TTY), fasteners take advantage of the 
torque yield principle. Most torque specifications build in a 25 percent 
safety margin--they can be overtorqued by 25 percent before damage occurs. 
TTY bolts do not have this safety zone. They are designed to be tightened 
just into the yield point but not to the extent that the metal is distorted.

The advantage is they deliver 100 percent of their intended strength, versus

the 75 percent strength provided by regular bolts. The drawback is that they

can only be used one time. Once they are removed from an application, they 
can no longer support the load they previously did, and they must be 
replaced with TTY bolts.


Brian

87 16v
86 8v (parts car)
85 Wolfsburg (white coming to a garage near me soon)



>From: "Fry, Larry" <LEF@chem-tronics.com>
>To: Brian Dettling <aa821@acorn.net>, scirocco-l@scirocco.org
>Subject: RE: scirocco-L-digest V1 #1932
>Date: Tue, 30 Oct 2001 10:30:56 -0800
>
>Brian-
>   ...lower front spring pad on 16V would make sense.
>No reason why you can't re-use clutch bolts, since they are 
>"stretch-bolts".
>
>Larry  sandiego16V
>
>-----Original Message-----
>From: Brian Dettling [mailto:aa821@acorn.net]
>Sent: Tuesday, October 30, 2001 9:06 AM
>To: scirocco-l@scirocco.org
>Subject: Re: scirocco-L-digest V1 #1932
>
>
>RE:  16V/8v spring rates.
>
>Some guestimates that may resolve the sring rate discussion.
>
>I figure my 87 16V OEM rate was 128-135 lb/in front.
>84 GTi (2 yellow + 1 green) front were 106-122 lb/in
>	rear for same 97lb/in.
>FYI, the Gti and the 16V Scirocco have a front lower sring perch that's
>lower than some old mystery struts.
>
>RE:  Replacing clutch fasteners
>
>Am considering repalcing the flywheel on short term 8V clutch.  Should I
>replace all the fasteners are can some be reused with the appropriate
>LocTite?
>
>TIA,
>
>
>--
>
>
>Brian D./OH
>How can you be in two places at once when you're not anywhere at all...
>Firesign Theatre
>
>q
>
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