C3 frame flex!
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
C3 frame flex!
There are multiple threads running on the Green Mamba build with video already, but what I noticed was the extreme frame flex at 7.38 on the video.
Look at the door gap and the back of the body bobbing up and down. Never seen another car flex like this, meaning other than Corvette.
I'm surprised he didn't put a roll cage in the car since he races it, it would have fixed this problem by stiffening up the whole frame.
Mike
Look at the door gap and the back of the body bobbing up and down. Never seen another car flex like this, meaning other than Corvette.
I'm surprised he didn't put a roll cage in the car since he races it, it would have fixed this problem by stiffening up the whole frame.
Mike
Last edited by v2racing; Oct 31, 2017 at 01:52 PM.
Instructor
Joined: Oct 2016
Posts: 211
Likes: 20
From: Raleigh NC
I wish I had not been ignorant to the vette frame flex. I was adjusting my door gaps with car sitting on 4 jack stands supporting the frame. I now know the car needs to be sitting on the suspension for such adjustments.
Oh well, live and learn.
Oh well, live and learn.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
I got lucky in that the P/Os of the old show car that is my '72 hotrod vette, had the frame welded up good in all the seams, and then my adding the cross support seems to be a NICE addition that I did about a dozen years ago.....
they did nice body/glass work back then, hard as hell to find anyone near that good with fiberglass today.....without spending 50 billion bux......
they did nice body/glass work back then, hard as hell to find anyone near that good with fiberglass today.....without spending 50 billion bux......
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
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Advanced
Joined: Nov 2015
Posts: 78
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From: St. Louis
Me too it took me 2 months and a lot of hours to figure this one out.
Racer
Joined: Mar 2003
Posts: 346
Likes: 33
From: OKC OK
and in recent years there are some very high performing and $$ suspension systems been brought to market for this exact chassis. Haven't heard of any mentioning upgrades for the chassis to minimize the flex, hmmm. I thought that in the Herb Adams suspension book he had a method of measuring twist in a chassis that could be done at home. Not as accurate as what the big 3 use but it would give you some idea.
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
It looks like a tire or driveline shudder started, which is fairly violent. So, no surprise it shook the body like that. If he does it enough times he'll break something in the drivetrain.
Melting Slicks
Joined: Jan 2004
Posts: 3,247
Likes: 210
From: Detroit MI
Melting Slicks
Joined: Dec 1999
Posts: 2,116
Likes: 156
From: Mid West
Cruise-In III Veteran
My 4 pt roll bar made a decent improvement, but I'm considering a removable petty bar too. I'm betting it would make a noticeable improve.
Last edited by Jason Staley; Nov 3, 2017 at 01:38 PM.
Instructor
Joined: Sep 2017
Posts: 169
Likes: 20
From: Westlake Ohio
Cool car but I would have edited that part of the video out. It adds nothing of any value. The down side is obvious. I would figure out how to brace the harness bar that's in the car now given that he states he tracks the car often. The flexing would probably be there on a Chevelle also only you would never see it. Wheel hop generates TREMENDOUS forces as we all know...
Thread Starter
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
I'm doing what I can to stiffen it up.
Mike