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Porsche 911 trail arms.

Gents.

My Good Porsche Shop alignment guy says that my trailing arm is bent,

Porsche 911 2.3 ST 1971 all racecar.

There is a tool P295B:




I donīt have this tool.

Is there any measure that can apply to check rear trailing arm for straightness.?

Thanks - Cheers - Olsen911 - Tommy Olsen
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Old 10-04-2017, 12:49 AM
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It's a 914 ...
 
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How did the shop determine that the trailing arm is bent? Is the car not aligning as expected?

If your trailing arms are original, they should be the early LWB steel ones. I *think* the aluminum ones off a 74-89 911 should fit, in case it comes to replacing them. The aluminum ones are supposed to be stiffer and may be a good upgrade.

Scott
Old 10-04-2017, 10:48 AM
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Porsche 911

Thanks Scott.

My rear end is loose and the alignment guy has read the tires and says that i need more negative camber.

But he canīt give me more without jumping out of specs. so he told that one of the trail arms is bent.

I would like to confirm this, somehow.

My trailing arms are the original early LWB steel ones and upgrade to alu. is not legal, class rules.

Scott - please share your specs.?

Thanks - Cheers - Olsen911 - Tommy Olsen.
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Old 10-05-2017, 01:42 AM
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My 911 has 930 trailing arms and the chassis has modified pickup points, so I'm not sure this will be a good comparison, but I get 2 degrees negative camber easily, and more is available.

What camber setting are you getting with your current setup? What exactly is causing him to conclude that the arms are bent?
Old 10-05-2017, 04:20 AM
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Just because he can't get all the camber you want doesn't mean they are bent....

Some cars simply can't get more than 2-2.5 degrees. Where is it set?
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Old 10-07-2017, 04:28 PM
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Porsche 911 trail arms.

Here is my specs.



It’s in Danish - Sorry.

Let my know if i should translate.?

Thanks - Cheers - Olsen911 - Tommy Olsen
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Old 10-08-2017, 11:18 AM
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Nothing there seems obviously wrong. Did he indicate what makes him say the trailing arm is bent?

Scott
Old 10-08-2017, 08:16 PM
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Thanks Scott.

Would like to have 2 - 2.5 degrees camber on the rears, but itīs toe out when trying to adjust.

That was leading us to think that the Trail arm is bent.

Let me know what you guys think.?

Thanks - Cheers - Olsen911 - Tommy Olsen.
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Old 10-09-2017, 11:53 PM
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Tommy caught me by surprise as your address "olsen911" is one of the addresses I use on some of my car forums, not this one.

Kent Olsen, family originally from Denmark. I believe name started out Olesen but Grandpa keep loosing mail to the other Olesen in town so he dropped the first "e".

Anyway my 72 had the original trailing arms and there was a little evidence it had been hit in the left. No tire wear or visible problems but something was wrong as I keep wearing out the left wheel bearing. Finally replaced trailing arms with aluminum, which also have larger bearing and never had a problem after that. Now 240,000 miles.

Kent
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Old 10-10-2017, 10:02 AM
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Use Aluminum arms for the win.
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Old 10-16-2017, 07:35 AM
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He says that it's not legal for his class? I have to say that is very picky for vintage racing , all classes here allow this upgrade.

I mean you could always swap out with another steel arm and see how it specs out?
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Old 10-16-2017, 09:04 AM
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Just an FYI. I've seen some mechanics claim the arm is bent because one side can get more camber than the other. And then it turns out that the toe eccentric was fowling the adjustment on one side.

To avoid this mistake, i always tell people to remove the toe eccentric when adjusting camber, then reinstall it to adjust toe once camber is achieved.
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Old 10-17-2017, 09:14 AM
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You can install the toe adjuster two ways, one won't give you full camber.
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Old 10-18-2017, 07:34 AM
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Quote:
Originally Posted by safe View Post
You can install the toe adjuster two ways, one won't give you full camber.
^^This
Sometimes a little filing of the adjuster slot is needed (or can be helpful).
I had one shop early on tell me they couldn't get more the 2deg with both sides matched. I now have just shy of 3deg on both sides. Some shops know the tricks to get the camber. Good luck.
Old 10-19-2017, 03:13 PM
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Thanks Guys.

I will check if the toe adjuster is the wrong way around.

Thanks - Cheers - Olsen911 - Tommy Olsen
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Old 10-24-2017, 05:06 AM
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