Go Back   VetteMOD.com > VetteMOD Technical Discussion > Chassis, Steering and Suspension

Reply
 
Thread Tools
  #1  
Old 10-11-2008, 09:45 PM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,757
My Photos: (2)
Default C3 front scrub radius?

Anybody got a number on that? Just trying to compare it to the C4 suspension I'm putting on.

Thanks,
Mike
Reply With Quote
  #2  
Old 10-12-2008, 03:51 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,491
My Photos: (299)
Default

Mike, The kingpin angle of a C3 spindle is 7 degrees, the angle on a C4 spindle is 19 degrees. The distance from the hub mounting face to where the hub centerline intersects the kingpin axis is 5 7/16 for a C3 and 5 3/8 for a C4.
__________________
Reply With Quote
  #3  
Old 10-12-2008, 05:57 PM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,757
My Photos: (2)
Default

Quote:
Originally Posted by BBShark View Post
Mike, The kingpin angle of a C3 spindle is 7 degrees, the angle on a C4 spindle is 19 degrees. The distance from the hub mounting face to where the hub centerline intersects the kingpin axis is 5 7/16 for a C3 and 5 3/8 for a C4.
Which C4 suspension (early or late) is that info from? Are there some drawings somewhere I can get a look at?

thanks a bunch,
Mike
Reply With Quote
  #4  
Old 10-12-2008, 08:56 PM
Twin_Turbo's Avatar
Twin_Turbo Twin_Turbo is offline
Netherlands | Der Maulwurf
 
Join Date: Mar 2008
Posts: 8,161
My Photos: (1296)
Default

With that info and the total tire diameter you can simply calculate the scrub radius.
__________________


[Only registered and activated users can see links. Click Here To Register...]
Reply With Quote
  #5  
Old 10-13-2008, 12:21 AM
69427's Avatar
69427 69427 is offline
United States | The Artist formerly known as Turbo84
 
Join Date: Mar 2008
Location: Clinging to my guns and religion in KCMO.
Posts: 2,757
My Photos: (2)
Default

Quote:
Originally Posted by Twin_Turbo View Post
With that info and the total tire diameter you can simply calculate the scrub radius.
Yes and no. The early and later C4 suspensions sure look different regarding the position of the upper ball joint, hence my question.
And, just eyeballing the same wheels/tires on the stock '69 and the C4 suspension sitting in the corner, it just looks much different than 1/16 inch. I'm just trying to figure out the datum point, as it were. I can do the geometry calculations after that.
Reply With Quote
  #6  
Old 10-13-2008, 12:48 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,491
My Photos: (299)
Default

The assemblies I measured for the C4 are w/ speed sensor hubs. I think that means 91-96. I have drawings for the C3 spindles and hubs but not the C4.


Quote:
Originally Posted by 69427 View Post
Quote:
Originally Posted by BBShark View Post
Mike, The kingpin angle of a C3 spindle is 7 degrees, the angle on a C4 spindle is 19 degrees. The distance from the hub mounting face to where the hub centerline intersects the kingpin axis is 5 7/16 for a C3 and 5 3/8 for a C4.
Which C4 suspension (early or late) is that info from? Are there some drawings somewhere I can get a look at?

thanks a bunch,
Mike
Reply With Quote
  #7  
Old 10-13-2008, 12:53 PM
Twin_Turbo's Avatar
Twin_Turbo Twin_Turbo is offline
Netherlands | Der Maulwurf
 
Join Date: Mar 2008
Posts: 8,161
My Photos: (1296)
Default

cad drawing of the C3 spindle? That's the only susp. part I don't have, never got around to doing them.
Reply With Quote
  #8  
Old 01-31-2019, 09:30 PM
phantomjock's Avatar
phantomjock phantomjock is offline
United States | Addict
 
Join Date: Sep 2009
Location: Retired Again!
Posts: 1,291
My Photos: (666)
Default

I keep digging up "old" threads that interest me and my project, "Elvira."
I've been all over the interWeb - and VetteMod is the place for much of the best information, assistance and importantly images. Thanks Heaps to TwinTurbo and all the originators and "keepers" of the 'Flame" that fuels our passion for C3s!

Now, on to the issue: I've found this diagram:
that "kinda" answers 69427's question from a while back. But now, he no doubt knows the answer!

But for me is the early C4 front upright really 19 degrees?! Wow. What is the Caster on the front end? 24 degrees? I'm looking at using these early C4 uprights for my front end, and would like to do some modelling before -- Buying.

Any help?

Thanks and Cheers - Jim
__________________
Rebuilder's Zen Saying:
One thought leads to another. If these thoughts link into a chain we become bound to the project. This bondage is subtle and remains until we complete the tasks -- or, STOP Thinking!
[Only registered and activated users can see links. Click Here To Register...]
Reply With Quote
  #9  
Old 01-31-2019, 11:14 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,491
My Photos: (299)
Default

You can sort of see the steeper C4 king pin angle in this pic.


Reply With Quote
  #10  
Old 01-31-2019, 11:40 PM
phantomjock's Avatar
phantomjock phantomjock is offline
United States | Addict
 
Join Date: Sep 2009
Location: Retired Again!
Posts: 1,291
My Photos: (666)
Default

Yes! And Thank you! The difference is quite obvious. I'll take 19 degrees as a given for my study.
Looks like a Van Steel front assembly in the foreground - or at least similar to the one I currently have on the project (that I'll be replacing).
Very good picture for comparison. Thanks again.

Cheers - Jim
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:36 PM.
 


Design by: vBulletin Skins Zone
Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.