1/2" master cylinder

Hello Ron,

I am in the process of converting a mastercylinder to 1/2 (12.7mm)
There is info on this from the INOC site, I got some info from a fellow Australian that wrote a report and drew up pistons ETC. I believe you can buy a kit from Norvil and possible other Norton suppliers. But If you want to do it yourself, like me, well you can got to a brake parts supplier.
Get him to look up by dimension 1/2" piston cups, these are usually out of power boosters, not master cylinders. 5/8" was the favoured size for english master cylinders. After sleeving down the master cylinder, I am using stainless, you obviously need to have a smaller diameter piston. It is probably best to start from scratch with another material, saw bronze and turn up a piston. INOC site has a drawing.

Like i say, I am just doing the mod myself now, so let me know how you get on?

RichardS

Richard,
Thanks for the info, but I am reasonably sure that these conversions that I am looking for, use a Jap 13mm master cylinder internals. Just slightly larger than 1/2". It would seem that since all of the engineering is already done, all I need to do is make the SS sleve and press it in. I am thinking of using SS bar stock and boring it to 13mm. If I run across something, I'll post off the info to you.
Thanks again, Ron T.

73nortonron said:

I am reasonably sure that these conversions that I am looking for, use a Jap 13mm master cylinder internals. Just slightly larger than 1/2".It would seem that since all of the engineering is already done, all I need to do is make the SS sleve and press it in.

Click to expand...

A complete purpose made 13mm kit (including the sleeve) is easily available-so why not use it? http://www.rgmmotors.co.uk/images/full/full_713d.JPG