Notices
924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
Sponsored by:
Sponsored by:

Question from technically challanged

Thread Tools
 
Search this Thread
 
Old Jun 9, 2004 | 01:41 PM
  #1  
Idoktr's Avatar
Idoktr
Thread Starter
Rennlist Member
20 Year Member
 
Joined: Aug 2001
Posts: 631
Likes: 126
From: Boston,MA
Default Question from technically challanged

My mechanic said that my "front castor was well under minimum spec and could cause the car to drift". What is a front castor, where is it and how is it replaced. What should the DIY cost be and what would the mechanics cost be?

Thanks...

PS also looking for tire suggestions for my 16 C-2 wheels that will be street use only....
Reply
Old Jun 9, 2004 | 01:46 PM
  #2  
924RACR's Avatar
924RACR
Addict
Rennlist Member

20 Year Member
 
Joined: Jun 2001
Posts: 4,081
Likes: 113
From: Royal Oak, MI
Default

LOL... it's an alignment adjustment (hence my amusement - it's to be adjusted, not replaced). Since it is an alignment, it of course needs to be adjusted on the alignment rack, and is not a DIY procedure therefore - unless you have access to an alignment rack!

The early (steel a-arms) cars move the rear mounting point of the front a-arms in and out to adjust caster (castor is a bean we make oil from to torture unruly little kids). Out all the way for max caster, in for min. Should be matched side-to-side, IMO. Did he therefore recomment an alignment? Mind you, changes in camber settings will change caster measurements, and toe setting will come into play as well.

Of course, if you really wanna have fun, you can dial in extra caster using Paragon's nifty camber/caster plates. I think I'm running around 4-5 degrees caster in my racecar, don't remember the stock setting...
Reply
Old Jun 9, 2004 | 01:50 PM
  #3  
Idoktr's Avatar
Idoktr
Thread Starter
Rennlist Member
20 Year Member
 
Joined: Aug 2001
Posts: 631
Likes: 126
From: Boston,MA
Default Told you I was "challanged"

Thanks for the info. I need to take the car in anyway, so I will have it looked at while it is there.

Thanks
Reply
Old Jun 9, 2004 | 03:11 PM
  #4  
Matt H's Avatar
Matt H
Race Director
 
Joined: Jul 2003
Posts: 15,712
Likes: 3
Default

Vaughn - why so much caster? Was there a reason you need the wheels set back/forward so far from centerline?

Did you know that stock cars have different caster for each front wheel? This is in the specs to adjust for road crown. Is it not a wear adjustment, but it can cause one hell of a pull.
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Reply
Old Jun 9, 2004 | 03:21 PM
  #5  
924RACR's Avatar
924RACR
Addict
Rennlist Member

20 Year Member
 
Joined: Jun 2001
Posts: 4,081
Likes: 113
From: Royal Oak, MI
Default

Yep! Free camber for the turns! Keep in mind, it's a racecar...
Reply
Old Jun 9, 2004 | 03:24 PM
  #6  
Dave's Avatar
Dave
Race Car
 
Joined: May 2001
Posts: 4,937
Likes: 2
From: Springfield NJ
Default

Could he have been refering to a caster block (the part that is adjusted to set the caster)? They do go bad sometimes.
LOL... it's an alignment adjustment (hence my amusement - it's to be adjusted, not replaced). Since it is an alignment, it of course needs to be adjusted on the alignment rack, and is not a DIY procedure therefore - unless you have access to an alignment rack!
LOL! I don't think the access to an alignment rack would help in this case...
Reply
Old Jun 9, 2004 | 03:29 PM
  #7  
theedge's Avatar
theedge
Addict
Rennlist Member
 
Joined: Aug 2003
Posts: 14,242
Likes: 3
From: Canada, Eh?
Default

Yeah did he say they were bad? They will tear when they are installed wrong. One of my old ones was actually two pieces, the metal surround and a chunk of rubber.

The 968 are a nice upgrade, since theyre all you can get now
Reply




All times are GMT -3. The time now is 12:24 PM.