[Fot] Clutch disk for HVDA 5 speed

[Bud Rolofson]

Hi Dusty,

I do think you’re asking for, if not trouble, then at least some challenges with unequal length axles. Your swing spring will “swing” differently with one vertical link essentially being shorter because it “leans in” at the top. I can’t predict the effect but unless you’re just doing circle track (only left turns) then the transition of the suspension going from left to right turns might get real interesting with not so smooth shifting of weight transfer or a twitch of some kind, or maybe even a sudden jerk.

The most obvious effect will be the camber of the real wheels will be different which will put different amounts of tire patch on the pavement resulting in different wear and probably handling. I made my vertical lengths adjustable with a kit from http://www.wolfitt.com/wolfitt_products_1.htm They indicate that very little change (1/4-1/2 inch) in the length of the vertical lengths will change the camber by about 1 degree. I didn’t do the geometry but a vertical link that “leans in” will be shorter and may give you a bigger change in the camber than you want to run on one wheel. Running different cambers on the rear wheels does not seem like a good idea. 

De-arching the spring or blocks between the diff and the spring will change camber but it would affect both sides equally. This link explains/shows the effects of those changes and a good visual on the swing spring operation. http://auskellian.com/paul/links_files/performance_enhancements.htm#rear

I would be hesitant to run different length axles as it introduces more variables to an already tricky system. You will go to a lot of work with the backplates, pressing bearings on and off, and other fun activities, I’d hate to see you do all that and be unhappy with the results.

I was lucky to find some brand new early Summers Brothers axles and switched them out only to find that the axles that came with the car were some of Kastner’s “indestructible” axles with the bigger u-joints.  If I’d only known I’d have kept them and just changed the u-joints. Oh well they can go on the next car.

Good luck,
Bud







> On Aug 12, 2018, at 7:56 PM, dustin nicholson via Fot <fot at autox.team.net> wrote:
> 
> Thanks for all the replies.
> 
> On an unrelated note, I’ve recently acquired a used Summers Brothers spit axle that is 1” longer than the corvair axle I was hoping to pair it up with (since I broke the other corvair axle). Am I asking for trouble to run this set up of unequal length axles? Seems the upright on the longer axle will just “lean in” to reach the leaf spring eye and it might just work. Or should I have the longer axle cut down and new u-joint yoke spline grooves cut?
> 
> I think you call this racing on a budget.
> 
> Dusty Nicholson
> 1971 FP Spitfire #4
> 
> 
> Sent from my iPhone
> 
>> On Aug 12, 2018, at 7:29 PM, Bill Tobin via Fot <fot at autox.team.net> wrote:
>> 
>> After further review, to use a football phrase,  the clutch disc is 8 1/2  x 1 1/8 shaft and 21 splines. That was on the box and I just measured and counted. PN on the box is 270917.
>> 
>> Hope this helps.
>> 
>> Cheers, Bill
>> 
>> 
>>> On 8/11/2018 7:52 PM, Bill Tobin via Fot wrote:
>>> McLeod pn270917, Disc, organic 8.5" 1-1/8, ought to do it. Came with my Eaglegate conversion.
>>> 
>>> Tell them that if they're making one for you, make one for me too. Engine's out and may as well put in a new clutch too.
>>> 
>>> www.mcleodracing.com
>>> 
>>> NFI
>>> 
>>> Cheers, Bill
>>> 
>>> 
>>>> On 8/11/2018 12:36 PM, dustin nicholson via Fot wrote:
>>>> Is anybody racing with the Toyota five speed? What clutch disk are you using?
>>>> 
>>>> Asking for friend who has a hot street TR6 with the 5 speed and has worn out the disk provided by Herman. He wants to replace with an upgraded disk. Moss is carrying on the HVDA conversion but he’s been told they will only be offering one clutch disk option which appears to be street grade. I believe Herman offered an upgrade, anyone know what it was or where to get it?
>>>> 
>>>> Dusty Nicholson
>>>> 1971 FP Spitfire #4
>>>> 
>>>> Sent from my iPhone
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