Re: cylinder studs: torque or length?

[Ben Barkow <dr.ben@xxxxxxxxx>]

> Thanks for the input This is the confusing part. Yu are (accurately)
> referring to the torque on the head NUTS (see Rod's picture at:
> http://www.pbase.com/rodneff/image/41825708)
>
> My question is the torque on the STUDS themselves (if any) - I have  
> had two
> people say that you JUST go by the length of the studs above the  
> cylinder
> (152.5mm and 132mm).
>
> - -- john
>
>
> On Apr 2, 2006, at 10:09 AM, Rod Neff wrote:
>
> what ever you do be careful, 20 nm is not enough, i have to look it  
> up, but
> i think this is the torque setting before you give the nuts 2 more 90  
> degree
> turns,,i dont like this method, i use 33.3 ftlbs, but thats just me,,
> http://www.pbase.com/rodneff/image/41825708
>
> rod neff
> santa monica
>
If I understand him correctly, I think Rod is on the right track and  
the factory approach isn't. After trying to verify the final torque  
used by his shop at 600 miles (an admirable research try but prolly no  
way to definitively know what the torque was that they used), he simply  
set the torque to 33 ft-lbs, as per historic practice.

While under controlled conditions, brand new parts, and known amounts  
of oil on the threads (none, I suppose), The Factory is right to use  
the plus degrees approach. But I found that there is so much  
variability in setting the initial low torque that it is really risky  
to blindly go a fixed number of degrees more. Oiled threads and a  
torque wrench used the old way prolly produce better/safer results, as  
Rod suggests. (However, Tom Cutter does not agree with this approach.)

Cheers.
                                                                         
                                           
Ben Barkow, Toronto... 40 seasons on Beemers, 45 as a biker

1961 R69s/rod, 1967-1999... really sup'ed up and fast

1984 R80RT/rod, 1998-2005  5 extra peak ponies in a wider flatter power  
band,
   much modified 2-into-1 exhaust, CR 9.5, Keihin PJ 34mm oval carbs,
   Uni filter, dual-rate springs with cartridge emulators, BT45/S11,  
Saeng fairing

1999 R1100S, 2004- Leo Vince exh, JetHot coatings, Techlusion 1031,
   large sticky foam filter, TB balance tube, debaffled exh xover, 12%  
reduced front spring, 26 inch windscreen, air horns, Diablo Stratas

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