Just out of interest, what bike calipers were you thinking of using? Off the top of my head, GSXR would seem to be the most common.

yeah,,, all this is pretty old hat David,,, i`ve set up Nissan Skyline GTR 3 pot calipers on mine with 13" wheels,,, In drummy uprights with brake caliper adaptor plate... & obviously not everyone would want that set up,,, for small 10" wheels there are plenty of "little" jap calipers around,,,daihatsu, honda, suzuki, subaru etc,,, all pretty easy to make fit... mostly just a tad of a trim on one side of the upright to get the caliper to sit in nice & tight & a braket for the caliper & a bit of this-n-that & --->voila,,, el-cheapo after market jap disc brake conversion

& there`s nothing wrong with the little drummy Cv joint,,, i`ve broken more Inner axles in the speedway car than drummy cvs i was using for 8 years,,, & before any of you ask,,, I really didn`t want to smash a set of "S" discs into the concreat wall so i just used 2nd hand old drummy brakes & we hardly ever needed to hit the breaks anyways,,, & yes it was on dirt so spin wheels instead of snap axles

& main reason for inner axles breaking was getting sandwitched by other big mother chargers, cortina & toranas,,,

& of course i`m not going to go on & on about how dam fast my speedway mini was & how it had "Massive" torque,,, none of you will believe me anyways & probly just start another dyno argument again

Or Convertable mini will chime in & tell you all about how he beat me "once"

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I smell opportunist....sounds like he has another agenda involving offering a "specially complied" caliper that will pass with "no problems" with a view to cornering the market knowing full well that there are multiple standard disk/caliper combinations that are equally compliant (whew )

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"Show me the Mini!"

I have done suzuki for 10" and others for 12" and 13" wheels. Most times I used drum hubs with adapter plates. Understanding the forces involved and also the Legalities I had the suzuki adapter plate inspected by an engineer. He said that they were more than adequate for strength .

The problem is that the CI calipers are very heavy so I looked at bike stuff. After doing some load/pressure calcs they would not be up to my standard. I tested a kwaka 4 pot and the caliper split at 1000psi. Repeated flexing they would fail with the pressure exerted in a mini brake system.
The next thing was to make some. As we all know the cost of discs for 10" wheels is very expensive especially 4 piston alumin ones. I am just looking at having an alternative to spending lots of money. If they work and I get the engineering passed ,then like most things I make then these will be avalaible to anyone.
I do not build things like my honda head or brake conversions to "corner a market",as when I need to earn money I go to sea or just live on my super pension. I can earn a lot more going to sea. I just like making things and getting them to work as an alternative.
I am not into lawn bowls!!!!!

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Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com

A seafarer huh?

David, David, David if you think I was casting nasturtions you are very, very wrong...absolutely not my intention...its just that the way you wrote the story it sounded like the Gingerbeer was knocking you back and suggesting you make a caliper to "his" specs.

I always enjoy reading about your engineering exploits...keep up the good work, Cheers Mick

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"Show me the Mini!"

David,,, i have a full set of wooden plugs/patterns for disc calipers & vented rotors to fit under 10" rims ,,, all ready to go through the casting process & finish machining,,,, just need some money to pay the casting mob & my machinist

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I should have explained, the engineer who does the reports for Transport SA is a bloke who I have known for many years. He is into racing and I do work on his race car for him.
I have been discussing this with him for sometime and we both agree on the problems with this project. He has looked at the drawings and my calcs for stress loads etc, and he passed the drawings. The only thing now is to make one for testing. I am going to pressure test the caliper to 3000psi.

Matt , I know we have all looked at this at some time, but to get rotor cast and machined would be very expensive. There is one particular vented rotor that is 8" off the shelf for $70. As for casting calipers the cost again will be high. The blocks of billet 6061 T6 alumin 160mmx75mmx 40mm and 160mmx100mmx40mm are $20 and $25 each [$10.50/kg] by using a rectangular block then the machining using a mounting jig is easy.
The two piston bores are done in lathe and then counter bored for piston seal with boring bar. The block is fitted to drilling jig in rotary table and indexed for the bolts to hold two halves. Use the same jig and angle rotary table 90 deg and drill/tap the supply ports from each side to the center. These holes pass thru back of piston bore and connect for cross-over port. This way the mounting side of caliper is symetrical for supply and bleed screws.
The final od shape is done in lathe. The center block to hold pads is made from 5058 steel ground flat bar with cut out milled to suit pads and drilled/counterbored for seal for crossover.
The tooling and jigs are time consuming to make and set-up but once they are made you have them forever.

_________________
Research is the difference between speculation and investment. Anyone who copys some one else will always be second
www.minisprintgt.com