Dunstall 810 master cylinder

hillbone · Apr 14, 2021

Hi. I have aquired an 810 Dunstall with the genuine twin disc assy. The current master cylinder in a non genuine one and i want to know if a genuine new lockheed will be effective.
Cheers mark

kommando · Apr 15, 2021

Find out the caliper piston diameter and use this to work out the master cylinder bore that gets you closest to the sweet spot of 27:1

L.A.B. · Apr 15, 2021

hillbone said:
The current master cylinder in a non genuine one and i want to know if a genuine new lockheed will be effective.

The genuine Dunstall twin disc kit master cylinder was a Honda (CB750) item, not Lockheed.

Bonhams Cars : A Norton Roadholder Paul Dunstall twin disc brake conversion, ((Qty))

comprising complete wheel with TT100 360 x 19 Dunlop tyre (tyre suitable for display only), fork sliders with integral callipers, lever/reservoir assembly, and calliper tool, Borrani alloy wheel rim WM2/19. (Qty)

www.bonhams.com

Dunstall Commando front master cylinder

Hi, It is true that the Dunstall Commando front master cylinder was those equal mounted on Honda 750 K1?. If it is not true, what was it?. Ciao. Piero

www.accessnorton.com

hillbone · Apr 15, 2021

Thanks. great feed back, i even have a K1 master cylinder. cheers

hillbone · Apr 15, 2021

kommando said:
Find out the caliper piston diameter and use this to work out the master cylinder bore that gets you closest to the sweet spot of 27:1

hillbone · Apr 15, 2021

handy chart. no idea what it means but i will learn , cheers mate

gortnipper · Apr 15, 2021

hillbone said:
handy chart. no idea what it means but i will learn , cheers mate

Find the diameter and number of pistons your caliper(s) have. Then, go across to find ~27. Go up to find the MC diameter that works well for that.

So, for a brake setup with 38mm pistons x4 (of them) - that would be a 15mm bore MC.

Dunstall 810 master cylinder

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