[Fot] TR-4 vertical link and trunnion

[Charly Mitchel]

BTW, when you do find some vertical links, check them for straightness. 
I've got several bent ones, it appears the right side is almost always bent. 
If they're bent, they'll bind up when rotated.  This can be difficult to 
check if not on the car.  When I rebuild my suspension,I assemble the upper 
and lower joints with the vertical without a spring  and then rotate it and 
go through the suspension range to check it.
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 4:06 PM
Subject: Re: [Fot] TR-4 vertical link and trunnion


> 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>