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so -
airtreck single piston 28.3cm2
airtreck twin piston 28.7cm2
io single piston 25.5cm2
vr4 twin piston 27.7cm2
not great but 27.7cm2 is better than 28.7cm2 when you are valved for 25.5cm2
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bob
In Topic: HELP! early "small-bore piston" front twin pot calipers
24 May 2018 - 10:18 AM
can you have the existing master cylinder bores out and sleeved to create a large bore...thus displace more fluid.
This was a common practice with some early toyotas when fitting twin cam engines. The brake place that does it will need to be able to supply a larger piston and seals. It will mean you will need to run a restrictor/biase valve in the rear line tho.
it's a really weird stupid internal design - slacks creek said they've not seen anything like it before.
I'm going to try and get the front/rear volumes same ratio as the FTO / Evo / Outlander and see how it goes - would have been awesome if i'd known prior to fully refurbishing the front pair of RVR HSG EVO3 calipers i'm running 
