105: New control arms point slightly backwards - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 9 (permalink) Old 09-01-2016, 03:39 PM Thread Starter
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105: New control arms point slightly backwards

Hey there

The title says it all, I installed new adjustable arms and they seem slightly pointing backwards after connecting it to the caster rods/arms. Which made me wonder and ask for advice here!

What I did:

- Install polybushings on the inner bush of the arms
- I tried to aim for the length of the original arms for later adjustment.
- The arm is not connected to the upright yet

Both arms point consistently backwards





So, am I just worried about something that is totally fine? How do yours look?

Grazie mille
Alessandro

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post #2 of 9 (permalink) Old 09-01-2016, 03:48 PM
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Possible a PO dealt with shot caster arm bushings by lengthening the caster rods?

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #3 of 9 (permalink) Old 09-01-2016, 03:53 PM Thread Starter
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Quote:
Originally Posted by DPeterson3 View Post
Possible a PO dealt with shot caster arm bushings by lengthening the caster rods?
The Caster Bushing looked fine to me. I only changed the arms because I wanted adjustable ones. I also compared size and distances of bushing to bushing and they seemed all the same.

Can I assume then that the push-back is not normal? The arms still move freely btw.

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post #4 of 9 (permalink) Old 09-01-2016, 04:53 PM
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Is the inner bushing centered in the pocket?

Ultimately, it'll be what the alignment rack that tells you that matters.

Have you compared the outer ends of a new and old rod to see if the caster bushing ring has the same distance and angle from the ball joint?

Don P
Carson City, NV

Past Alfas...
59 102 Touring (first Alfa $500 running)
65 Sprint GT (2nd Alfa, $500 daily driver)
102 Sprint (never did anything with it, but wish I had)
74 Berlina (first new car - now certainly rusted into oblivion)
61 Giulietta Spider G-Prod Race Car (where is it now?)
84 Spider Veloce (rarely drove it, so sold it)
86 Quadrifoglio (Dull car - no more 115s for me)
1971 Montreal "The Full Monty". Fair winds and following seas

Current Alfas
59 102 Touring Roadster - restoration complete, enough Alfa for any rational man. Or irrational, for that matter
Oops. Add to the "present" list, 10204 01488, 2000 Touring Roadster project

And past...
Two 1946 Stampe SV4C (c/n 294 "Rocinante" - wife's favorite airplane. RIP), and c/n 235 "La Bon Temps Femme" (gone to a new home, but never forgotten)
Zlin 50LA (+9 -6 gees, titanium spar, 1200 lbs, 260HP rumored to now be in Brazil)
1946 Luscombe 8A
Starduster Too (recently spotted at the Nevada City, CA airport - over 20 years and an entire continent separating it from our stewardship in Binghamton, NY)
1955 Cessna 170B (wife taught me to fly tailwheel in this)

And present...
64 Mooney M20E ("Rambo". My faithful steed for over 40 years) Over 55 years old, and just returned from a trip to Argentina in him
Newest in the fleet
1967 Piper Super Cub on Wipline amphibious floats (a true "all terrain vehicle")
2010 Triumph Thunderbird


You can snap roll an Alfa only one time...
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post #5 of 9 (permalink) Old 09-01-2016, 10:29 PM Thread Starter
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I will recheck the all the distances, to make sure. The inner bushing is centered and fits snuggly into the hole between the two plates.

I am also going to install the old arms temporarily to see whether the PO had the caster setup like that.

Thanks!

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post #6 of 9 (permalink) Old 09-04-2016, 02:03 AM Thread Starter
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So it seems quite a bit of people run caster like that. (e.g. http://www.alfabb.com/bb/forums/gt-1...ml#post6742201 ) I just do wonder what amount of caster i am running currently (lacking the tool to measure) could be and if its good for the bushing back there to spread it like that?

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post #7 of 9 (permalink) Old 09-04-2016, 06:32 PM
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If worse came to worse, [SARC] you could always take it to an alignment shop and have it all checked (caster, camber and toe). New adjustable control arms can throw the camber off unless adjusted to the same length. Always advisable after a suspension rebuild. Specs in the OM.

PS: I had an Alfa with different length caster rod adjustments and upper arm positions because some PO hit a curb and pushed the whole right side back. That unequal adjustment was required to get that side correctly tracking.

Last edited by Anfanuts; 09-04-2016 at 06:38 PM.
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post #8 of 9 (permalink) Old 09-04-2016, 11:05 PM Thread Starter
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Hey @Anfanuts

I setup the controls arms just as the fixed ones, so i can start from where I was, which wasn't particularly bad. Each side is equally caster-y and thus i think it was intentional by the PO. Still I do wonder - what does this caster do to the life of steeringbox and bushings?

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post #9 of 9 (permalink) Old 09-05-2016, 08:09 AM
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a lot of people crank caster into the front end... sometimes for damage control, but mostly to increase front grip. more caster adds neg camber dynamically during turns -and then goes back to static camber when wheels straight ahead. will increase steering effort and give more "snap back" to straight ahead wheel position when come otu of turn. put together and then take for front end alignment. very worthwhile on any car that has not had it done in awhile.
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