Hi

What are typical bore diameter master cylinders please to use on a book 750 MC Locost 1300cc Crossflow racer running Cortina front hubs and calipers and Ford Escort rear axle with drums please? I will be using twin Girling or Willwood master cylinders (integral or remote) on an OBP pedal box with a brake balance bar.

Just to get me going as I realise that this set up gives an opportunity to change bore cylinder as well as balance using the bar. My knowledge of old Ford Escorts and Cortinas is limited so not sure what to start with, either 5/8”, 7/10”, 3/4” or 7/8”.

Currently planning to use a cable operated clutch actuating mechanism on a Ford Type 2 gearbox (standard or Escort Sport) with a converter for cable operation on the OBP pedal box - if I were to switch to a different Ford gearbox (Type E, 2000E or Type 9) with a separate Ford or aftermarket bellhousing to suit hydraulic clutch actuation with a single Girling clutch master cylinder what would be typical bore sizes for the clutch master and slave cylinders please?

I am building a road legal hillclimb car similar spec to a 750 MC 1300cc Crossflow Locost racer.

Thanks
Mike

[Edited on 29/7/24 by Mike Wood]

[Edited on 29/7/24 by Mike Wood]

[Edited on 29/7/24 by Mike Wood]