clutch integral master cylinder

[bullman 3]

Hi looking to convert to hydraulic co axial clutch from cable,what size bore integral master cylinder would you use 0.625" or 0.700"bore and why.Using type 9 5 speed sraight cut long shaft box,regards Geoff

[Mike Biddle]

Whats important is the ratio between the master and slave cylinder bores, and the force required to disengage your clutch. This has a dramatic effect on pedal effort.

 

I think we went down to a 15MM bore master cylinder on my car, and that resulted in a really nice clutch pedal action, quite light and long enough that it is not an "in or out" situation.

 

It did require a seperate resevoir to be fitted on the bulkhead, because that cylinder does'nt come with an integral one, but that was quite a minor problem.