[V8Vairs] upper strut on LM rear suspension

[Michael Svinth]

Tim,
Innovation loves company so I'm glad we made this connection.
 I was having a hard time understanding this suspension stuff so I built a scale model of the rear last week so I could play with different modifications and measure the results.  What I found was that with a SLA(short/long arm)setup, I got modest neg camber gain on the bump but also got neg camber gain on the droop(not what I want).  When I raised the lower arm inside pivot point or lowered the upper arm inside pivot point, I got neg camber gain on the bump and positive camber gain on the droop.  I am using 14" arms.  The combination that I liked the best was 1" up on the lower and 1" down on the upper.  The result was about 2-3 degrees gain on both the bump and droop in 3" of travel.  
I've not done this before so if I am missing something, I would appreciate someone pointing it out.
How is your 930cv to universal yoke adapter designed?  I took mine to a driveline place here in Petaluma and he was not in favor of the four bolts in the yoke handling the load.  
Do you have a good source on the control arms made out of 1" tubing with helical(swivel) adjustable ends?
I'll get pics when I am a little further along.
Mike
> From: tbarrie at meritprecision.com
> To: v8vairs at corvair.org
> Date: Thu, 12 May 2011 15:55:09 -0400
> Subject: Re: [V8Vairs] upper strut on LM rear suspension
> 
> My work computer is having trouble communicating with a few specific web
> providers. Please forgive me if this shows up several times.
> 
> 
> Mike, I am in the process of converting from a Kelmark conversion to a
> Porsche 915 and going through what you are with upper struts. 
> I have welded a 2 by 2 tower to the rear wheel carrier between the spring
> and the shock. I have built a carrier to mount the trans to which is
> supported by the old Kelmark cross member at the rear and tied into the body
> structure below the package shelf vertically. It has the inboard pickups for
> the upper and lower tie bars. 
> I have 16" tie bars on the bottom and 14" uppers to get the camber gain. I
> just measured some pictures of independent rear ends and that appears to be
> the rough ratio. Nothing scientific so I would appreciate any feedback on
> that.
> I am using 930 CV's on each end of the axles. I have a Toolroom with a CNC
> at work so we are making up adapter plates to mount the CV to the corvair
> universal joint carrier.
> And that is where I am at so far. Tim
> 
> -----Original Message-----
> From: v8vairs-bounces at corvair.org [mailto:v8vairs-bounces at corvair.org] On
> Behalf Of Michael Svinth
> Sent: Wednesday, May 11, 2011 2:07 PM
> To: v8vairs at corvair.org
> Subject: [V8Vairs] upper strut on LM rear suspension
> 
> 
> 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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