[V8Vairs] V8Vairs Digest, Vol 75, Issue 2

[Jim Acker]

I'm not sure my site still shows my initial attempt at a four link rear end.  I abandoned the plan when I priced the required half shafts with slip-sleeves and the fact that my 930 could easily deal with the side loads.  In your case, I assume the Renault transaxle can't take the loads and you need to build a fully isolated drive shaft arrangement.  I don't have a lot of advice, but here are some thoughts.
1. There is something you can attach to.  Build custom brackets to attach the upper arm to the UN1.  
2. If you really can't find an attachment point in line with the drive flanges, then consider a cage attached where you can.  Then attach your upper arms to that.  You can see that I sort of did that for my lower arms, which may give you an idea.  
3. Also look at my pictures of Arch Evan's SuperVair kit, which builds a box/cage mounted to the frame and the transaxle fits into that.
4. Geometry is tricky.  The travel is an arc, so you always want both arms parallel or higher at the wheel.  This avoids positive camber at the beginning of the travel.  The degree to which your arc creates negative camber is math I don't know, but I applied a basic assumption that seemed to work.  If you make the distance the same from the center of the drive shaft to where both arms attach, on both ends, you have a perfect parallelogram.  Now, build your mounts so the upper arm is slightly shorter (I think I picked an inch shorter).  As the travel moves up, the shorter arm follows a shorter arc and creates negative camber.  Someone better with geometry may be able to give you better guidance on dimensions to get specific camber. 

Jim Acker

On May 12, 2011, at 9:00 AM, v8vairs-request at corvair.org wrote:

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> Today's Topics:
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>   1. upper strut on LM rear suspension (Michael Svinth)
>   2. Re: upper strut on LM rear suspension (Marty Scarr)
> 
> My build is a mid-mounted Subaru 3.3l with a 5 speed transaxle in a '65.  By using cv half shafts, I am aware of the need for an upper strut to handle the side loads.  The transaxle(UN1) does not have suspension mounting points so will have to attach everything to the cage/body member.  Could those of you that have tackled this problem share your ideas, what your did, what you would do different etc.  With the need for neg camber gain, I find this a bit confusing.
> Thanks in advance from a newbie
> Mike                         
> Mike
> 
> Jim Acker used a 915 transaxle in his V8 conversion and had some of the same
> issues.  You can read about his solutions here:
> 
> http://www.corvair.org/chapters/chapter981/V8Vair/index.html
> 
> <http://www.corvair.org/chapters/chapter981/V8Vair/index.html>Marty Scarr
> 
> On Wed, May 11, 2011 at 10:07 AM, Michael Svinth <msvinth at hotmail.com>wrote:
> 
>> 
>> My build is a mid-mounted Subaru 3.3l with a 5 speed transaxle in a '65.
>> By using cv half shafts, I am aware of the need for an upper strut to
>> handle the side loads.  The transaxle(UN1) does not have suspension mounting
>> points so will have to attach everything to the cage/body member.  Could
>> those of you that have tackled this problem share your ideas, what your did,
>> what you would do different etc.  With the need for neg camber gain, I find
>> this a bit confusing.
>> Thanks in advance from a newbie
>> Mike
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