I have been giving a bit of thought to building a replica of some description and the ultimate for me would be either a 33 Daytona or Stradale coupe - but to achieve that to a very high standard is going to be extremely costly. The chances of actually locating a Montreal engine are pretty slim (let alone a genuine flat plane crank Autodelta V8) and a Colotti gearbox. Googling around I found references to 2 or 3 outfits that are building replicas no doubt with varying degrees of quality.
I came to the conclusion that a TZ2 coupe would actually be a bit (at least) easier to recreate. My idea here is to build a close interpretation with minor modern comforts using mostly fairly easy to get parts. Another reason is the similarity of the layout compared to clubmans/locost kit cars that are very popular. Apparently accurate CAD designs of the TZ2 are publicly available, although I'm yet to view a copy - if anyone has DXF files, please get in touch. NOTAR Cars claim to be making replicas to a high standard although their website has not been updated since 2005. Does anyone know if they are still in operation?
My aim is not to build an exact copy - but a replica that can be used and registered on the road and possible used for occasional track sessions.
Here is a summary of my ideas for a TZ2 replica:
- tubular space frame based 99% on the original car but with increased tubing wall thickness to increase strength of chassis
- utilise Alfa 75 twin spark engine, 105 series gearbox, steering column and possibly 105 series live axle - I would like to consider an independent set up with inboard brakes however I can't think of any readily available options for this - perhaps Fiat 130/131?
- the twin spark engine would be standard to get the car through inspection/registration
- utilise a modern AC kit as the car would no doubt be a bit of a greenhouse and I live in a hot climate (South Australia)
- fibre glass body - my Alfa history book collection indicates that the first TZ2 was constructed in alloy and subsequent cars were made in fibre glass using a moulds from the original prototype, so a fibre glass body is not technically "inaccurate". That said, I'm not put off on the idea of creating a hand formed aluminium body.
If someone already has body moulds and is willing to sell a complete shell then at least some of the hard work has been done. Other concerns include:
- windscreen / rear screen - are recreations available?
- wheels? Does anyone make replicas of the original wheels? I believe at least one TZ2 had larger wheel arches and was fitted with Tipo 33 type wheels too.
- suspension - this will probably be custom made to suit the chassis. Spring rates and shock absorbers will need to be carefully considered.
- internal and external trim
- instruments, lighting - lenses and fittings for various Italian brands seem to be still available if one searches hard enough (Carello, Siem, Jaeger etc)
- seats - I have found a classic car seat manufacture that builds something similar to what I've seen in the TZ2
The more I look into it the more complex the project seems, however I have a couple of aces up my sleeve - I'm technically skilled and already have multiple cars under restoration and can use CAD applications with FEA to analyse stresses and loads on the mechanical components. I also have access to a professional car builder's shop with over 30 years experience with the engineering and compliance of custom vehicles (mostly clubmans).