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Jim K · Post by **Jim K** » Wed Jan 12, 2005 3:53 am

Hi Zamani,
In the 15" Compomotive MO wheels, I have 309mm discs with Brembo 4-pots.The discs are from the M3 BMW, reduced to this size from their original 315mm.Good stuff, they're handed too, L and R with curved vanes, 28mm thick. On the next set I'm making now, with the same calipers, I will use the 166 3,0 discs, 310 original sizex28mm. The BMW discs (Brembo brand) cost me 127Euros a pair (with a good discount). I hope the 166 discs will be about the same. Therefore, my cost for these brakes is: 570Euros for calipers+pads (all brand new from eBay, usually readily available), 127E for discs and 130 for hard alloy brackets for the 75 uprights, total 827Euros. I know that unfortunately for non-Europeans this is expensive with the rising Euro exchange rates, but I think its a reasonable price for a very good brake setup. Two years ago, this would be about US$670, but now its about US$1050!! Quite a jump!
Regards,
Jim K.

tectoteam · Post by **tectoteam** » Sun Jan 23, 2005 2:36 pm

hello

if someone can give me hint tips.
for made the front rotor hats, about the material to use ?

i buy a set of 2 wilwood calipers, the 4 piston. forged.

then for the material...i'm not sure.

can i use the most common alloy that are used for machining parts on lathe...(in france we call it AU4G).
a friend works on a machine shop...so....him can made me the parts for a resonable contribution.

thanks.
gaetan

Barry · Post by **Barry** » Mon Jan 24, 2005 11:48 am

Gaetan,The above hats or bells I made from t6 Billet alliminium.The material must have a high resistence to fatigue -other than that there are no major criterea.Make sure your machinist uses generous radii when machining them.It cuts out possible stress raisers.We have run these ally bells on the 3 race gta`s under racing conditions and have had no probl;ems whatsoever.Hope this helps..

Barry

tectoteam · Post by **tectoteam** » Mon Jan 24, 2005 1:51 pm

Barry wrote:Gaetan,The above hats or bells I made from t6 Billet alliminium.The material must have a high resistence to fatigue -other than that there are no major criterea.Make sure your machinist uses generous radii when machining them.It cuts out possible stress raisers.We have run these ally bells on the 3 race gta`s under racing conditions and have had no probl;ems whatsoever.Hope this helps..

Barry

ok.

i may understand what you want to say....
if its made on common alloy, its important to made it whitout any abrupt edge...

i will fit this with wilwood 8 bolt discs.

when i finish the first draw(~2weeks) i'll show it on the topic.

thanks
gaetan

Maurizio · Post by **Maurizio** » Mon Jan 24, 2005 11:47 pm

Go at least for AlSi1 MgMn 100 Hv (Werkst. Nr. 3.2315 / ~6082 ASTM) and if you can get your hands on AlZn5.5MgCu 165 Hv (Werkst. Nr 3.4365.71 / 7075-T62 ASTM B209M) that would be best, but this needs surface treatment for example anodizing.

tectoteam · Post by **tectoteam** » Tue Jan 25, 2005 1:31 am

Maurizio wrote:Go at least for AlSi1 MgMn 100 Hv (Werkst. Nr. 3.2315 / ~6082 ASTM) and if you can get your hands on AlZn5.5MgCu 165 Hv (Werkst. Nr 3.4365.71 / 7075-T62 ASTM B209M) that would be best, but this needs surface treatment for example anodizing.

ok.

should.../may i forgot the au4g

when you spoke about hv.....its hardeness in VICKERS ? ok...

some treatment at the points where the discs touch the hat where the bolt are placed ?

(sorry for my english...far to be perfect)

Maurizio · Post by **Maurizio** » Tue Jan 25, 2005 1:57 am

AlZn5.5MgCu 165 Hv is not very corrosion resistant. To keep the hub nice totally anodise (is always good to do that with aluminium, but its a cost issue).

Hv = Vickers

I cant find specs for au4g, but a machineshop would be able to locate the material with the werkstoff number I added.

It is always a pain to find cross references for US/DIN/Iso etc coding

ingegnere · Post by **ingegnere** » Tue Jan 25, 2005 3:10 am

Hi Guys!

Although it' not the gearbox section, I'd like to ask a question. You seem to be skilled in metallurgy.

Do some of you know the material quality and heat treatment (maybe it's not the right term, but I hope you understand) used for transaxle syncro rings?

I would highly apreciate any answers. Thanks.

Maurizio · Post by **Maurizio** » Tue Jan 25, 2005 3:18 am

ingegnere wrote:Hi Guys!

Although it' not the gearbox section, I'd like to ask a question. You seem to be skilled in metallurgy.

Do some of you know the material quality and heat treatment (maybe it's not the right term, but I hope you understand) used for transaxle syncro rings?

I would highly apreciate any answers. Thanks.

Sorry, can't help on that one ....

ingegnere · Post by **ingegnere** » Tue Jan 25, 2005 3:39 am

That's a pitty.

Shall I contact the factory maybe?

tectoteam · Post by **tectoteam** » Tue Jan 25, 2005 3:50 am

ingegnere wrote:That's a pitty.

Shall I contact the factory maybe?

i know i can't and answer your question....
but why ? you want to know the material or the treatment of synchro rings ? (perhaps i have an idee)

Maurizio wrote: It is always a pain to find cross references for US/DIN/Iso etc coding

ho yeah

boring......

gaetan

Barry · Post by **Barry** » Tue Jan 25, 2005 10:00 am

Complicated !!( Brakes)

I, If you are looking at making your own synchros,Dont bother (Im assuming this is your idea or something simmilar?)

Take old worn out ones down to your local aircraft repair and overhaul shop and have them re-plasma sprayed.Talk to the aircraft chap and explain what they do-this will give him a better understanding of what type or mixture of plasma spray to apply.Ive been doing this for 20 years and I can recycle the same synchro about 5 times before i junk it.

Barry

tectoteam · Post by **tectoteam** » Tue Jan 25, 2005 10:03 am

well i find some info.

my 'french' AU4G it's : 2017.

the specs:http://www.matweb.com/search/SpecificMa ... um=MA2017O

and for the famous 7075 t6 (AlZn5.5MgCu 165 Hv , you spoke maurizzio)
the specs:http://www.matweb.com/search/SpecificMa ... m=MA7075T6

looks like the au4g drives me on a wall

ingegnere · Post by **ingegnere** » Tue Jan 25, 2005 11:17 pm

Barry

I don't want to be off topic, but you're right. The idea is to make new sycros. (I wrote more about this on Transaxle fix??!!! topic) The method you've suggested sounds great! The only problem is I don't know yet where do we have repair shop like that, but I will ask. Thank you for the info!

Tectoteam, thanks for you as well.

Maurizio · Post by **Maurizio** » Wed Jan 26, 2005 12:59 am

tectoteam wrote:
well i find some info.
my 'french' AU4G it's : 2017.
the specs: http://www.matweb.com/search/SpecificMa ... um=MA2017O

and for the famous 7075 t6 (AlZn5.5MgCu 165 Hv , you spoke maurizio)
the specs:http://www.matweb.com/search/SpecificMa ... m=MA7075T6

looks like the au4g drives me on a wall

Perfect ( www.matweb.com ) this is alway my first and best place to look first! But couldn't find you 2017 .............

http://www.matweb.com/search/SpecificMa ... m=MA6082T6 must be available at every self respecting machine shop.