[Fot] TR-4 vertical link and trunnion

[Tony Drews]

Do you have a sense of how much "offset" there is at the outboard end 
of the A-arms?  That would make up for the lowered pivot in the 
trunnion - at least partially.

Also, someone mentioned to me that the stub axle may have been moved 
up on the TR-6 upright (which would lower the car).  Can anyone 
confirm / deny this?

It would be awesome to have the parts side by side for comparison - 
both upright / vertical link and trunnion / lower A-arm combination.

Alternately, a few measurements from a TR-4A / TR-6 front suspension may help:
On vertical link from bottom of upper ball joint mount to center line 
of spindle
 From center line of spindle to spring pan

That should give me a good feel for how much (if any) the TR-6 setup 
would lower the car.

Tony

At 11:17 AM 8/20/2012, Charly Mitchel wrote:
>It depends on which way you install the arms,  offsets up or offsets 
>down. My suspension had spacers to lower it and I flipped the lower 
>a-arms and removed the spacers and remained the same height.
>Charly
>----- Original Message ----- From: "Tony Drews" <tony at tonydrews.com>
>To: "Charly Mitchel" <charly at mitchelplumbing.com>; "MadMarx" 
><tr4racing at googlemail.com>; <fot at autox.team.net>
>Sent: Monday, August 20, 2012 8:52 AM
>Subject: Re: [Fot] TR-4 vertical link and trunnion
>
>
>>THAT's it.  Left hand thread / Right hand thread.  Thanks.
>>
>>OK, next question - If I switch from TR-4 to TR-4a (or TR-6) lower 
>>A arms, does that undo the lowering effect of the later 
>>trunnions?  My car is low enough already, and messing with spring 
>>spacers doesn't sound like any fun at all.  I've got two weekends 
>>before the next race to get this done.  It sounds like the later 
>>A-arms are a direct bolt on for the earlier car with the welded in 
>>lower frame pivots.  It may also eliminate the need for the reaming 
>>and spacers.  It would probably also eliminate the additional 
>>camber gain - not sure that's a plus, but everything else would be a positive.
>>
>>Joe, your TR-250 front end is getting more attractive as we go along... :)
>>
>>Tony
>>
>>At 10:41 AM 8/20/2012, Charly Mitchel wrote:
>>>My guess is the are L&R handed to keep from mixing them up.  The 
>>>trunnion has the castor built into them and if you tried to 
>>>reverse them the wheel would have opposite castor.  The threads on 
>>>them are also L&R handed and can only be assembled as a set L&R.
>>>Charly
>>>----- Original Message ----- From: "Tony Drews" <tony at tonydrews.com>
>>>To: "MadMarx" <tr4racing at googlemail.com>; <fot at autox.team.net>
>>>Sent: Monday, August 20, 2012 8:33 AM
>>>Subject: Re: [Fot] TR-4 vertical link and trunnion
>>>
>>>
>>>>I'm looking at a diagram of the TR-4 and TR-4a
>>>>front suspension.  On the 4A, the vertical link
>>>>is different for Left Hand side of the car and
>>>>Right Hand side of the car while on the TR-4 it's
>>>>the same part for both sides.  The trunnions are
>>>>"handed" too - right / left hand for both set ups (but are 
>>>>different parts).
>>>>
>>>>Why is the vertical link different from side to
>>>>side?  I'm not seeing the difference and want to
>>>>make sure I cover my bases if I make this conversion.
>>>>
>>>>Thanks, Tony
<snip>