Echidna
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| posted on 13/7/08 at 07:13 AM |
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Tandem MC
I am about to buy this tandem MC
http://www.rallydesign.co.uk/product_info.php?cPath=562_582_1311&products_id=10444
Can i use this proportioning valve to alter front-rear brake pressure bias?
http://www.rallydesign.co.uk/product_info.php?cPath=562_596&products_id=4108
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britishtrident
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| posted on 13/7/08 at 09:42 AM |
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Thats a 1" (25.4mm) bore master cylinder --- way too big for a Locost/Sevenish car !
A lot of the Wilwood brake equipment isn't suited to Seven style cars as a lot was designed for large US stock cars which use very large
leverage ratios on the pedals.
The bigger the bore of the master cylinder the higher the pedal pressure required to stop the car.
No matter how hard you press it with such a big bore cylinder is very unlikely you will be able get any wheel to lock
European and Asian production cars use mastercylinder of 0.81" to 0.91" bore have a pedal leverage ration of between 7.5:1 and 9.5:1 and
they use a servo.
On a Locost or other Sevenish car it is very hard to get a pedal leverage of more than 5:1
To get acceptable pedal pressure you must use a smaller bore master cylinder ( 0.7" to 0.75" ) ideally you want a cylinder from a car
without a servo such as a 1977 Mk1 Fiesta 997/1100 (without servo) or a 1971 Cortina Mk3 1300 (without servo) or a 1973 Triumph Spitfire 1500
but all these cylinders have built in resevoirs.
If you need a cylinder with a remote resevoir then the rear engined Skoda Estelle is the only suitable donor I know but it is a 0.81" bore
cylinder
All these master cylinders are available mail order from Brakes International website
Rear brake pressure regulator valves, at least one person on the forum has had problems with that particular valve.
If you require a pressure reduction/cut off valve the Fiat Uno or Fiat Ritmo Lada Riva valves are suitable and very cheap.
[Edited on 13/7/08 by britishtrident]
[Edited on 13/7/08 by britishtrident]
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Echidna
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| posted on 13/7/08 at 04:50 PM |
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Do you think this MC will be good enough?
It's from a Cortina, 20.6mm bore
http://cgi.ebay.co.uk/FORD-CORTINA-MK4-5-BRAKE-MASTER-CYLINDER_W0QQitemZ200236937539QQihZ010QQcategoryZ27377QQcmdZViewItemQQ_trksidZp1742.m153.l1262
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britishtrident
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| posted on 13/7/08 at 05:00 PM |
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quote:
Originally posted by Echidna
Do you think this MC will be good enough?
It's from a Cortina, 20.6mm bore
http://cgi.ebay.co.uk/FORD-CORTINA-MK4-5-BRAKE-MASTER-CYLINDER_W0QQitemZ200236937539QQihZ010QQcategoryZ27377QQcmdZViewItemQQ_trksidZp1742.m153.l1262
No that the cylinder off a car with servo --- go to the brakes international website
http://www.car-brakes.co.uk/ click on "Buy online" and search on the models I listed.
You will find the Brakes In. prices very good.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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skidude88
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| posted on 15/7/08 at 12:48 PM |
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Avoid - I've fitted one (wilwood), very heavy, in the cold & wet (our summer) you get cramp in your foot just sat at traffic lights!
[Edited on 15/7/08 by skidude88]
Early MK de-Dion CBR1000 FJ-FP.
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skidude88
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| posted on 15/7/08 at 01:01 PM |
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Oh... and if you really want that MC off ebay, I've got one of those surplus to requirement that was a kinda panic buy! 
(from that same ebay dealer)
[Edited on 15/7/08 by skidude88]
Early MK de-Dion CBR1000 FJ-FP.
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Echidna
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| posted on 7/9/08 at 05:43 PM |
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I am going to use the original Sierra's drum brakes at the rear for reasons of economy. At the front i am going to use the Wilwood Powerlite
brake kit. The calipers pistons come in three variations. 1'', 1.25'' and 1.38'' each. The rotors will be 257mm.
The problem is that Adam's excel spreadsheet cannot help you with drum brakes. You should have disc brakes all around in order to make the
analysis.
With these info, what tandem MC would you suggest? What diameter and how can i find it? Thanks!
[Edited on 7/9/08 by Echidna]
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Echidna
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| posted on 8/9/08 at 07:35 PM |
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Anyone?
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