Folks, Whilst I realize it maybe a little late, I've started to wonder if the extra bracing we've stuck in my Haynes Roadster might be too
much! (Quiet Cheffy before you start ) I've still the engine bay to sort, and it seems to be quite a bit heavier than my old Locost.
Would the collective be kind enough to look over the photos and give an opinion?
I did very similar to you, but with a Pinto, the completed car weighed 690kgs at SVA and is a much better car because of it. The ratio of sprung
weight to unsprung weight is much more favorable, giving a production car ride quality without compromising handling, the tyres work better at
20-22psi which is closer to their design pressure that the lightweight cars running 16psi.
My day job is repairing accident damaged cars, so my additional bracings were to improve crash resistance as well as stiffness, triangulation of the
transmission tunnel was also in case of prop breakage.
Car is looking good, keep us updated
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
That's looking a bit like my Formula 27 chassis.
That weighs 650kg all up but it sits on the road a lot better than some of the BEC's I passengered in.
Also because it's a CEC the extra weight isn't as punishing on the engine and transmission.
Unless you were aiming for an out and out racer I think it will be fine.
Keep the posts coming.
I think extra bracing can be beneficial at times but you have added it to a largely stiff portion of the chassis anyway. From the bulkhead to the dash
is a very stiff area to start with, whereas the dash to the seat back is the part of these cars with the least torsional stiffness. I would be
inclined to decrease the amount of extra bracing around the tunnel and increase the amount adding the cockpit sides and seat back to suspension
points. I would also add small diagonals from bulkhead to engine mount points in the 3rd dimension as with more power and vibration going in this area
is looking fairly planar and could use small improvement.
Wow, what a great project! The Alfa V6 is a fabulous engine and the 12 valve version is torquey to boot. It may be a bit heavy but if you're
after a sports car not a maximum lightweight, high power beast then that's OK. I had a 164 for a while with this engine and the tone under
acceleration was spine tingling. What gearbox arrangement do you have? The ones I've read of are an adaptor plate to a Ford type 9 or a slice
of Alfa front wheel drive bell housing mounted to a rear wheel drive box like the type 9. Some have used the Alfa 105 gearbox, or if you can find one
the old Alfa 6 / Alfa 90 ZF box.
Looking forward to reading your build log
Ross in NZ
Cheers Ross, A friend whom I brought the project from used to race a V6 alfa in Rwd and made up a bellhousing by welding a few alloy nuggets into a
Cosworth T5 box. So it should be able to handle the torque.
Not the clearest picture, but it's hidden in here somewhere.