Re: [DML] Modified Trailing Arms For 1/2" Bolts
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [DML] Modified Trailing Arms For 1/2" Bolts



Tensile strength is only part of the story, you have to be careful with ductility, aka "brittleness" and in general with steel the higher the tensile strength, the more brittle it becomes. A suspension component should have a degree of ductility, but not to the point of fatigue or elastic limit. The torque spec for the TABs is far lower than would normally be applied to such a bolt.

Martin

------Original Message------
From: content22207
Sender: dmcnews@xxxxxxxxxxxxxxx
To: dmcnews@xxxxxxxxxxxxxxx
ReplyTo: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Modified Trailing Arms For 1/2" Bolts
Sent: 7 Feb 2012 05:12

You are absolutely correct -- both trailing arms are currently off my car in the process of being sanded down and repainted (in fact the entire rear suspension is currently off the car for sanding and painting).

If I use Grade 9's to reattach my trailing arms, they will be 3.5% stronger than the Grade 12.9's you sell (and less expensive). If I use Bowmalloy's to reattach my trailing arms, they will be up to 15% stronger than the Grade 12.9's you sell, although probably similar in price (Bowmalloys are up to 200,000 lbs tensile strength, average 190,000 lbs, and Made in USA as always).

Trivia: rear suspension uses 1/2-20 bolts for all pivoting parts, not metric (trailing arm bolts and bolts that hold the rear hubs to them are 12mm).

Bill Robertson
#5939

--- In dmcnews@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@...> wrote:
>
> Well this one slipped the net....
> 
> Surely to drill out the trailing arm, you have to remove it from the 
> car? That means disconnecting the brake hoses and reconnecting and 
> bleeding afterwards, and the rest. It's a lot of effort to go to in 
> order to save not a lot of money.
> 
> (advert) don't forget I stock geomet coated 12.9's made in the correct 
> M12 hex-head just like the originals, $49/pair shipped to North America. 
> (/advert)
> 
> Martin
> 
> On 31/01/2012 18:15, content22207 wrote:
> > This should definitely cause some wailing&  gnashing of teeth:
> >
> > I just modified #2508's trailing arms and bushings for 1/2" diameter bolts (removed slightly more than 1/64" of material). Big snub washers have to be enlarged as well. Stock shims slip right over a 1/2" bolt no problem, as do the serrated lock washers.
> >
> > 1/2" bolts open many more possibilities than do 12mm. Bare minimum I will install Grade 9's (3.5% stronger than Grade 12.9, 20% stronger than OEM). I also am going to try to find fractional Inconel 718's (same material as Toby's bolts). Whatever gets installed will have proper hex heads rather than socket heads (Grade 9 heads are much taller than standard heads, about the same size as a nut). It's easier to find zinc or cadmium plated 1/2" bolts in TAB lengths than 12mm. And they're less expensive too (TAB length Grade 9's are about $7 per bolt).
> >
> > Bill Robertson
> > #5939
> >
> >
>




------------------------------------

To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links




Sent from my BlackBerry®

------------------------------------

To address comments privately to the moderating team, please address:
moderators@xxxxxxxxxxx

For more info on the list, tech articles, cars for sale see www.dmcnews.com

To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnewsYahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/dmcnews/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/dmcnews/join
    (Yahoo! ID required)

<*> To change settings via email:
    dmcnews-digest@xxxxxxxxxxxxxxx 
    dmcnews-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    dmcnews-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/



Home Back to the Home of PROJECT VIXEN


Copyright 2006 ProjectVixen.com.  All rights reserved.

Opinions expressed in posts reflect the views of their respective authors.
DMCForum Mailing List Archive  DMCNews Mailing List Archive  DMC-UK Mailing List Archive