fancy brake discs and standard discs... is there anything differant in the materials used???
speaking to a guys at work and he nestled an idea in me head...
what's to stop me getting a new pair of standard discs... and angle grinder... and making some carefull 1mm deep groves in a disc... hey presto.. grooved discs... all the benifits and not the silly cost???
i knwo it's gotta be done right and no silly deep cuts etc.. but just an idea
obviously grooving deep will weaken the discs. i'm the site the grooves were about 1 - 2mm deep on me black diamonds i had on me xr2, that 1mm grooves should be fine.
are fancy discs made out of a more solid material? to make the disc stronger so the grooves don't weaken them? would this honestly make much of a difference if any on standard dics to the strength.
aye but the drilled bit really does weaken the disc as it goes all the way through... the drilled bit is only a groove... surely when you wear the disks thin it's weaker than a few grooves... but still well within safety limits?
Don't know about this but I used to be a metalworker so............when you cut into metal you cut through its molecular structure or "grain" thereby weakening it.
Marlon is right when he talks about the castings being made with the holes integral to the disc. This will maintain the structure and strength. I would imagine the grooves would have be cut in exactly the right place or you would alter the balance and get hotspots again weakening the disc.
Forget drilled discs. For my 75 3.0 I went with BIG non-drilled brakes. 302mm from a Toyota Supra and Wilwood calipers. BTW, they were cheaper than standard Alfa parts. Total cost was about UKP400 including CNC machninig adaptors, carbon pads etc.
But the 155 has big discs already, my 155 V6 has ok size disc, 284mm. Maybe you should think about getting 4-pot calipers from a GTV V6 or Fiat Coupe 20V Turbo.
alfasalv - www.alfasalv.co.uk - are selling CAR (italian people) crossdrilled/grooved/vented discs (click on the go-goodies then scroll down) for my car (2.0 16v ts - 1977 - the 285mm ones) for £42 each... that's the same price more or less for standard discs from you local motor factor people... bargain!
might be cheaper still for the other 2.0 8v, 1.8 16v because they are smaller discs???
On the subject of cutting your own grooves (sorry to tear the thread back to the beginning again wink ). I imagine that you would have to be very precise with your cuts. If the spacing is not completely accurate you could unbalance the disk with the same effect as an unbalanced tyre. Lets face it, we know how bad a tyre out of balance by 5g can be so getting the disk out by 15-20g could have a similar effect. Who knows, if the grooves are of unequal depthe and seperation, even by a little, you may get uneven heating under heavy braking and so warp the little darlings.
Sorry about the waffle - I`ve read through the whole forum and this is the only thing I can think of saying.