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| Bike caliper conv to suit mini https://www.ausmini.com/forums/viewtopic.php?f=2&t=49741 |
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| Author: | david rosenthal [ Fri Jan 30, 2009 2:53 pm ] |
| Post subject: | Bike caliper conv to suit mini |
I was picking up some heads from the bike wreckers yesterday and found some brake calipers off a big kawasaki bike. They were 4 piston and are about 6" long by 3" wide. I am wondering if anyone has done or knows of a conversion using bike calipers. These looked about the same size as the KAD 4 piston calipers. They bolt together with 4 bolts and have a spacer in the middle to suit the disc thickness |
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| Author: | Harley [ Fri Jan 30, 2009 3:02 pm ] |
| Post subject: | |
I don't think they'd be practicle in a mini, certainly not on the front. They're designed to stop something much lighter than a car, so whether or not they are 'heavy duty' enough is what I'm wondering? |
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| Author: | DarkenMini [ Fri Jan 30, 2009 3:31 pm ] |
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TRY IT go on YEAH if it works tell us how hard it was to finish. |
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| Author: | TheMiniMan [ Fri Jan 30, 2009 5:01 pm ] |
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David i`ve been thinking about doing it for years & years but all the bike FRONT calipers seem to have that silly braketry angle with the lugs offset all funny & if you face yours up to a mini hub you`ll see what i mean the rears are a better lug combination/angle but are usually p!$$y small so would probably only suit fitment to the rear of a mini, which wouldn`t be a bad thing tho go for it & let us know how you go,,, get it all working good & then sell me a pair of your brackets 
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| Author: | Mick [ Fri Jan 30, 2009 5:13 pm ] |
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The material used in the mounting lugs will be the limiting factor here. The lugs mounting my R1's calipers to the forks are 6mm thick to pull up a 150kg motorcycle to the point where the tyre breaks traction and slides. The lugs mounting a standard set of calipers to a Cooper S disc brake hub is 13mm (in steel instead of ally) to pull up a 700 kg car with a tyre twice as wide. These certainly don't look strong enough for the application. |
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| Author: | drmini in aust [ Fri Jan 30, 2009 6:02 pm ] |
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Mick wrote: The material used in the mounting lugs will be the limiting factor here.
The lugs mounting my R1's calipers to the forks are 6mm thick to pull up a 150kg motorcycle to the point where the tyre breaks traction and slides. The lugs mounting a standard set of calipers to a Cooper S disc brake hub is 13mm (in steel instead of ally) to pull up a 700 kg car with a tyre twice as wide. These certainly don't look strong enough for the application. The S calipers and swivel hubs are actually grey cast iron not steel- rigid yes, but it's not as strong as you might think. 
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| Author: | simon k [ Fri Jan 30, 2009 6:40 pm ] |
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I've thought about it too, but baulked when I looked at the mountings... they're designed to stop a 150kg bike, with a 100kg person on it... but from 300kph, not from 150kph.... maybe? |
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| Author: | Morris 1100 [ Fri Jan 30, 2009 7:24 pm ] |
| Post subject: | |
Also think about the clamping force on the caliper itself. You would need a lot more pressure on the pistons to stop a Mini. (I wonder what the line pressure on the bike would be?) I think that the caliper may split before the mounts break. 
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| Author: | man+van [ Fri Jan 30, 2009 7:32 pm ] |
| Post subject: | |
I havent seen a vented rotor on a bike, unless you were goin to stay solid the caliper wouldn't have enough space for the rotor. |
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| Author: | simon k [ Fri Jan 30, 2009 7:58 pm ] |
| Post subject: | |
man+van wrote: I havent seen a vented rotor on a bike, unless you were goin to stay solid the caliper wouldn't have enough space for the rotor. david rosenthal wrote: They bolt together with 4 bolts and have a spacer in the middle to suit the disc thickness
you can make a thicker spacer to suit the disc - same as for the metro and the aftermarket (minisport etc.) calipers |
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| Author: | Morris 1100 [ Fri Jan 30, 2009 8:07 pm ] |
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simon k wrote: man+van wrote: I havent seen a vented rotor on a bike, unless you were goin to stay solid the caliper wouldn't have enough space for the rotor. david rosenthal wrote: They bolt together with 4 bolts and have a spacer in the middle to suit the disc thickness you can make a thicker spacer to suit the disc - same as for the metro and the aftermarket (minisport etc.) calipers That is what Holden did with the XU1 calipers (and the Bathurst Monaros before that) They just got a bit of plate and cut it to shape and drilled some holes, easy peasy! |
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| Author: | david rosenthal [ Fri Jan 30, 2009 11:17 pm ] |
| Post subject: | |
These calipers have 2 x 12mm holes cast into oneside of the body about 10 -12 mm thick. The hole set-up is same as mini and most dual piston caliper. The front forks had a triangular casting on the forks to bolt caliper onto. The bike disc was app. 6-7mm thick and about 220mm dia but I have some 8 1/4" ventilated discs off a diahatsu that I was going to machine down to 8". Then make a new wider spacer plate with same position for "O" rings for cross over sealing. There are 4 x 8mm cap screws thru body to bolt together The pistons are 1 1/2" [have not measured accurately] and the pads look almost the same as the suzuki ones that I use. They are same as Honda civic. The fluid line into the caliper is one one side and is 10mm X 1 mm pitch. All the fluid porting is internal. They look quite a solid caliper and Micheal says that they are made from a magnesium alloy. One reason the bike boys do not use them is that they are too heavy and bulky for race bikes and they have lighter 6 piston ones. He was going to find some Honda ones that come off the big touring bikes that he says are similar. It's just another crazy idea, I cannot help it but it might be a cheap way of making some 8" vent 4 piston brakes. |
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| Author: | Mick [ Fri Jan 30, 2009 11:57 pm ] |
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Out of interest, was it a modern kwacka, or one of the old heavyweights? |
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| Author: | bnicho [ Sat Jan 31, 2009 9:01 am ] |
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Someone told me years ago they used four piston aftermarket callipers designed for a Harley on their Mini. But it may have been rubbish. 
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| Author: | david rosenthal [ Sat Jan 31, 2009 3:29 pm ] |
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Mick wrote: Out of interest, was it a modern kwacka, or one of the old heavyweights?
I think that it is about a early 90 model kwacka 1000? there was no eng just the frame |
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