985cc Turbocharged Nova Sprint Car

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Originally Posted by novarally

I had a chat today with the ever helpful Paul at 'Plastics 4 Performance', and he reckoned 2mm will be OK for the rear quarter and door windows.

But he suggests 3mm for the tailgate window.

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see if it's worthwhile weight wise to go for 2mm, but with a couple of aluminium bars running down the window to hold it in place

if it is curved & bonded, then sod it, it'll do.. the only time the rear windows will get stress is when colin slams the door

Seeing as I don't know the motorsport rules & regs, I'll ask the obvious question, do you need to have rear & side windows at all?

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Originally Posted by Welsh Dan

Seeing as I don't know the motorsport rules & regs, I'll ask the obvious question, do you need to have rear & side windows at all?

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You do, yes.

So i was wrong to suggest the 2-3mm Plexiglas then??

jesus this car is going to be feather light, didnt some hatches have a skiny rear bumper like the saloon that could save a couple of grams

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Originally Posted by MK999

I would have thought it's the heat of the discs that largely decides how much the pads break down into the gas that iirc, causes brake fade? Kinda like touching water with a heated paperclip, or a lump of steel, both still bubble at their surfaces, granted the paperclip cools faster as well though.

The mass (as a function of velocity) decides the KE though and also I meant the inertia of the vehicle more than the rotating inertia, so that's 2 direct relationships to mass that effect braking, calling it irrelevant is a bit extreme imo, it's one of the main factors that effect braking requirements!

It may not have come across in my posts, but I'm all for giving it a go, but my prediction is heat is an issue, and either extra cooling needs to be employed, or a beefier disc used.

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I've spent a good deal of time trying to track down the right motorcycle disc and bell assembly to suit my plans, but have drawn a bit of a blank as most bikes seem to use a disc of roughly 320mm.

I want to use a disc of (roughly) 280mm.

But today I've been speaking to a company who will custom make me a solid disc and alloy bell to whatever size and thickness I want.

I asked for a price on a 280mm x 5mm cross-drilled disc, and they can do that, complete with a custom alloy mounting bell for £130 each, which has got to be a bargain.

Weight-wise the alloy bell is going to be roughly 350g, and the disc itself around 1.6kg (cast iron, as opposed to the stainless steel which bikes use), so it's still going to be a huge weight saving, and will fit without any messing about. Just leaves the caliper mounting bracket to sort out.

maybe only a small weight saving but i think that the early wiper motor you have on there is heavier than the late one

plus with the late one you could get a alloy base plate made up

just an idea

colin, i thought you were going for really small wheels..... like the mini boys use???

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Originally Posted by mowgli

colin, i thought you were going for really small wheels..... like the mini boys use???

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Some of the Mini's use 10" wheels, and some of them 13".

I'm going to be using 13" (which will accomdate a 280mm disc and motorcycle caliper).

I did think about using 10" on the Nova, but I think it might look very silly, and will upset all the geometry no doubt.