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C4 Front suspension geometry?

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Old 12-07-2009, 07:22 AM   #1
jasonmckay
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Default C4 Front suspension geometry?

Hi all,
I am currently mocking up my cobra kit to accept the front end from a C4 donor and need to understand the relationship between the lower and upper control arms. Mainly the degree offset the upper is from the lower. Does anyone have a CAD illustration or a diagram showing this? I cannot use the C4 K-member due to size and that fact it's bent from the collision. The width apart of the control arms is not an issue, just need to know how the upper relates to the lower.
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Old 12-07-2009, 09:31 AM   #2
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Quote:
Originally Posted by jasonmckay View Post
Hi all,
I am currently mocking up my cobra kit to accept the front end from a C4 donor and need to understand the relationship between the lower and upper control arms. Mainly the degree offset the upper is from the lower. Does anyone have a CAD illustration or a diagram showing this? I cannot use the C4 K-member due to size and that fact it's bent from the collision. The width apart of the control arms is not an issue, just need to know how the upper relates to the lower.
Go to a frame straightening shop and see if they will let you look at their spec book, it plots the suspension pickup points from 2 datums - the ground plane and the centerline of the car. I did that when I mocked up the suspension in my car.

Jim
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Old 07-15-2017, 10:10 PM   #3
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hope this will help
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File Type: pdf Vette_front_suspension%5b1%5d (2).pdf (31.4 KB, 71 views)
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Old 07-15-2017, 11:52 PM   #4
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Quote:
Originally Posted by jasonmckay View Post
Hi all,
I am currently mocking up my cobra kit to accept the front end from a C4 donor and need to understand the relationship between the lower and upper control arms. Mainly the degree offset the upper is from the lower. Does anyone have a CAD illustration or a diagram showing this? I cannot use the C4 K-member due to size and that fact it's bent from the collision. The width apart of the control arms is not an issue, just need to know how the upper relates to the lower.
It would be important to know if you're wanting to use '87 and earlier suspension or the '88 and later.

Most Cobra kit chassis specified which and most offered a suspension member that worked.

Whose kit is yours?

A fabrication of your own maybe?

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hope this will help
Your information you feel is based on which C4? '87 and earlier or '88 and later? I've seen earlier that don't match those.

Last edited by WVZR-1; 07-16-2017 at 12:05 AM.
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Old 07-17-2017, 02:40 PM   #5
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hope this will help
Holy 8-year-old thread, Batman!

But your drawing is still very interesting. Do you happen to know if this is from the early or late C4 front suspension? Judging from the large amount of anti-dive, I'm guess the later version. But can you please confirm?

Also, if you happen to have similar dimensional drawings for the rear it would be much appreciated.
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Old 07-18-2017, 01:31 PM   #6
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In order for more people to have access, I've uploaded my SolidWorks model of a C4 suspension (late model) on 3DContentCentral

http://www.3dcontentcentral.com/part...&catalogid=171

It is to model the pickup points to study rollcenters, anti-dive angle etc.
It is NOT meant for component fitment
Some parts are greatly simplified Links are modeled as rod ends as I have rod ends on my 1995 Corvette
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