Nismo Big Bore Slave Cylinder

[Alf]

I have a HKS GD Pro twin plate (push type), some resellers of the nismo big bore (13/16) slave cylinder say that its not suitable for twin plate clutches.

Can anyone confirm?

[The Dan]

They say this because it reduces the secondary travel of the slave cylinder due to larger fluid capacity but the same fluid displacement. Some twin plate manufacturers require a full 11mm travel of the bearing to fully disengage the clutch. If you only get 8 or 9mm due to the displacement thing, you will not fully disengage the clutch. Only ever use the big bore cylinder on clutches that are super heavy. There is no excuse to have heavy pedal, just lazy manufacturers.

Install the clutch, if it's super heavy and you don't like it...get a second hand slave cylinder and have it bored out at your local brake remanufacturer (ABS etc) from 3/4 to 13/16. Will cost you about $40-$60 to do and is exactly the same thing. Try the bored cylinder and if it works fine then use it, if it doesn't, put your old one back on and sell your new Nismo big bore cylinder to someone else.