T56 Magnum Conversion

I'm a setting up the hydraulic clutch kit I got from American Powertrain, in a HotRod article they mentioned grinding off the nub on the clutch pedal and drill a hole in the same spot to attach the master cylinder push rod. Now after reading this thread it seems doing it that way the ratio might be off?

I will be using a Passon 5 speed, but the throw out bearings are the same design.

Also, there is a Tilton master cylinder I have found that is shorter than the wilwood, and the output is on top, not in the end where you need inner fender clearance. I didn't want to cut my inner fender just yet, in your build it does not matter. ;)

mopardude318 said:

I'm a setting up the hydraulic clutch kit I got from American Powertrain, in a HotRod article they mentioned grinding off the nub on the clutch pedal and drill a hole in the same spot to attach the master cylinder push rod. Now after reading this thread it seems doing it that way the ratio might be off?

I will be using a Passon 5 speed, but the throw out bearings are the same design.

Also, there is a Tilton master cylinder I have found that is shorter than the wilwood, and the output is on top, not in the end where you need inner fender clearance. I didn't want to cut my inner fender just yet, in your build it does not matter. ;)

Click to expand...

Yes, they are wrong, if you do that, you'll get approximately half of the clutch pedal throw the original bellcrank had. The ratio needs to between 5 and 6.5:1 which I believe is mentioned in the AP directions (but not the one for my kit). You will find yours is about 4.3:1 (length from center of pedal to pivot/length from clutch rod mounting hole to pivot). So basically you'll need to move the hole closer to the middle of the clutch pedal cross-arm, which will make it land approximately on the bend, this is why I cut that off and welded on the 1/4" bar.

Since it's a universal piece...it universally doesn't work without mods.

I also looked at that tilton, but the reality is that I don't drive this thing in much bad weather, that area isn't sealed anyway (I cut out a totally non-structurally attached section), and I cut the rest of the car already so why not lol