PARTS NEEDED:

CIVIC 92-00/CRV 98-01 CLUTCH SLAVE (3/4") BOLT ON PART
ANY TOYOTA 7/8" CLUTCH SLAVE REPAIR KIT



Now we need to make the bore of the clutch slave bigger from 3/4"(stock) to 7/8"

Here is a comparison of the piston of the clutch slave

7/8" on the left and 3/4" on the right

Brought my SLAVE at a LOCAL MACHINE SHOP to make the SLAVE's BORE bigger,they did a great JOB but didn't do a MIRROR FINISH for the inside..So DIY MIRROR FINISH

DRILL PRESS with GI TUBE attachment to do the MIRROR FINISH



I bought 600 grit sandpaper and attach it on a gi tube. I used my drill press for it.



After sanding it off. I finish it with honing paste.Ones used for valves.



Here is the finished clutch slave







Below are the finished measurement

PISTON:



CLUTCH SLAVE:




The BASIC PRINCIPLE of the MOD is found on HYDRAULIC SET-UPs

 

You should make a few of them, and sell them.

 

So how well did this work out? Was there a big difference in the pedal effort? I could see this being a much bigger benefit to the civic/integra guys with with stiff puck clutches.

 

I did make a few and sold to our local club

It is not pain in the a%# when in traffic, huge difference from the stock

 

While this is all great, the problem would be a greater distance needing to be traveled with the clutch pedal. It may be fine for a vehicle that is babied, but for people racking out the gears it could cause issues. I haven't done the math or calculations but it is something that should be considered.

 

just the solution i was looking for, do you think the slave could be bored out any more or is that the limit? i'd like to try 1".

 

What diameter is the master cylinder? You could calculate the actual hydraulic advantage (or "leverage")

Since the force of the slave cylinder is based on area, going from 3/4" to 7/8" should give you a 36% advantage. Cool.