Grantura Mk2A FIA racer / hill climb car torsion bars set up

[mk1S1293]

Hi to all of you,

I am working on a 1961 Grantura mk2A and I am slowly making it according to FIA Appendix K specs.
Starting from the fact that I want to keep it as a semi lightweight car as it was, even racing modifications, I am keeping its interior trim. Just for your reference re the final weight.
Well, my idea is to have a car that can be sometimes raced on track, hilclimbed and driven to and back the circuit on its wheels. Not a front runner of course but a car closer to 60's tuning mods.

Topic is if any of you has any suggestion regarding front and rear SPRING RATES to be used.

I am wondering to make solid torsion bars instead of leafs but I am not sure if I am going to make work all four torsion bars or just the bottom ones.
Any suggestion would be really appreciated.
Thanks in advance.
Regards,

[RobMk2a]

Speak to Mike Youles at Kirkmichealmotorsports.com in Sussex - he ran a Mk2a at the Goodwood members meeting early this year. The restoration is documented in this forum.

Kind regards

Rob

[mk1S1293]

Hi,
Thank you for your advice.
Already contacted Michael.
Still waiting for his reply.
Any other here who could help me?
Regards,

Francesco

[prideaux]

RobMk2a said:

Speak to Mike Youles at Kirkmichealmotorsports.com in Sussex - he ran a Mk2a at the Goodwood members meeting early this year. The restoration is documented in this forum.

Kind regards

Rob

You will need to speak to someone else Sadly Mike is not there anymore and not contactable
A

[Grantura MKI]

I think that you will find the ride too harsh if you build the bars solid....multi layered bars will give a better ride, with out taking your tooth out!
Best,
D.

[alfa-chris]

We already noticed he also left our Grantura Owners FB group. Also, we were going to meet up last weekend but I was not able to contact hm anymore.

What happened to Mike? I know he has had some health-issue.

prideaux said:

You will need to speak to someone else Sadly Mike is not there anymore and not contactable
A

[Granturas]

mk1S1293 said:

Hi to all of you,

I am working on a 1961 Grantura mk2A and I am slowly making it according to FIA Appendix K specs.
Starting from the fact that I want to keep it as a semi lightweight car as it was, even racing modifications, I am keeping its interior trim. Just for your reference re the final weight.
Well, my idea is to have a car that can be sometimes raced on track, hilclimbed and driven to and back the circuit on its wheels. Not a front runner of course but a car closer to 60's tuning mods.

Topic is if any of you has any suggestion regarding front and rear SPRING RATES to be used.

I am wondering to make solid torsion bars instead of leafs but I am not sure if I am going to make work all four torsion bars or just the bottom ones.
Any suggestion would be really appreciated.
Thanks in advance.
Regards,

It would be very difficult to build a solid torsionbar. With a laminated as the VW bar is you can adjust spring load by ading or rather taking out elements.
With a solid one you would have to thin it down and can not put it back.
I can not see an advantage with a solid torsion bar. Why did neither Porsche nore VW use solid ones with this type of axle? When manufacturer like Jaguar or also Porsche used solid Torsion bars, they offered also different spring strength/load to give people the chance for adjustment.
The standard VW torsion bar you can buy is too strong anyway if you use two of them in one axle.
It is just my opinion, no reason for any ......

K.W.