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Post by carnut on Dec 23, 2012 6:01:20 GMT -5
G,day fellow Terrapinists.
I am starting to aquire parts for my Terrapin build (Brisbane Australia). It will be a 1275 Cooper "S" powered Mk1 Terrapin running 10" rims. It will be used for small curcuit work & hill climbs - most likely sporting a rear wing. I am looking at putting cooper "S" - 7.5" dics & calipers on the front, & Cooper 7" disc & calipers on the rear. I will be using an adjustable bias bar on the brake pedal and the pedal has a 7:1 ratio. I am also not wanting to use a brake booster/servo (weight). Can anyone tell me what master cylinder sizes would be best to operate front and rear? My obvious choices are either 0.625", 0.700" or 0.750" - but which one/s?
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Post by MBEngineering on Dec 23, 2012 9:30:34 GMT -5
HI Carnut
I will check to see what I have on my car, (in bits at the moment) also I would run the "S" 7.5in discs all round, I did with no prob's.
If you need any more info/photos of the fitting of the S discs I did on my car , please let me know.
regards mike
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Post by carnut on Dec 25, 2012 4:16:37 GMT -5
Hi Mike,
My method of madness was based on the Formula Fords, I believe they run Cooper "S" on the front & the smaller Cooper calipers at the rear. I am also tryng to balance out the brake bias bar so it is not screwed way off centre [upsetting optimum settings for what it was designed]. How do your brakes perform?, easy to lock up or do you have to really stand on them? I think most of it comes down to the master cylinder sizes. Any pics of your Terrapin would be Ace, pics are so hard to come by. You can post them or send them direct to my Email address. By the way what type of racing do you do? Is your Terrapin driven by an A-series mini engine & gearbox? Regards, Steve
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Post by MiNiTiCi on Dec 25, 2012 5:41:20 GMT -5
On the Formula Fords I have worked on, the discs were quite large diameter but they used Cooper S calipers on the front and Cooper calipers on the rear.
For your Terrapin you may find that you require quite a lot of rear braking.
You are not limited to cast iron Cooper or S calipers therefore you could use some of the after-market al.alloy 4 pot calipers.
You can get these calipers to fit a variety of disc sizes, some of which can fit inside a 10" diameter wheel.
Typically a later type 8.4" disc is machined down in diameter to fit.
You can even fit cut down vented discs - but these are still a bit heavy.
Probably a lot easier than sourcing Cooper S or Cooper discs and drive flanges.
The brake balance bar should help but you can also juggle with the bore sizes of the master cylinders if your balance if far off.
Merry Christmas, Doug.
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Post by MBEngineering on Dec 27, 2012 11:07:00 GMT -5
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Post by teapot on Dec 28, 2012 16:06:40 GMT -5
Carroll Smith ' Tune to Win' pg 112 gives force variations vs master cylinder bores, pedal layouts and bias everthing you need to know but didn't like to ask. It's a book I have had for years but so much is still relevant for many things, there are other titles by the same author ie. Prepare to Win etc.
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