Daily Archives: January 23, 2018

Making room for a clutch pedal

Since I’m back to square one on the T bucket build, I’m contemplating how to make enough room in the footwell for 4 pedals including the dead pedal. Now installing a mid engine leaves tons of room for a clutch because everything is behind the body so all I need to worry about is linkages. But as low as the Sprint-T is the transmission and bellhousing will be fighting for room with the gas, brakes, and if I get a manual transmission the clutch pedal.

So one thing I was thinking about was my 210 or so pounds sitting halfway between the center and the outside of the body has a moment of 2362.5 inch pounds. I can off set the engine and transmission by an equal moment and get a perfectly balanced car for autocrossing, and that many inches will be available for pedals and feet to push the pedals. My worst-case is an all-steel SBC with a TH 350 transmission that weighs a total of 695 pounds that is 19″ wide at the crankshaft, and much wider at the heads. The tricky part is I only have the width of the front firewall to work with because of how the body pinches down to the firewall on a T-bucket. On the driver’s side I have 3½” of room without offsetting the engine to the right. Add in the offset and I’m looking at 6.9″ (175mm) of side-by-side foot room to fit feet that are 173mm wide the pair without shoes. My absolute worst case is the 4.6 Mod motor by Ford that weighs a ton and is like 22″ wide where the footbox goes, same size as the Coyote but 200 pounds heavier and half the power. The moment for that engine alone is almost the same as the SBC engine with the TH350 transmission. It’s a good thing that engine is so durable because otherwise it sucks as an engine.

Actually I don’t need to fit my feet in that space, just the master cylinder(s) and linkage. I have an entire 7½” to put my feet, side by side with the SBC engine mounted on centerline, or 11″ with the engine offset. Which leads me to ask how small were my parents’ generation’s feet, because I know there were Track Ts with the body mounted down low over the engine and the driver with his backside inches off the racing surface sitting beside the transmission, using a frame that had been heavily “Z’d” to get the engine and body down low.

I was also thinking about using the kit brake mount and a false floor over the master cylinder to move the pedals out of the way. I’m not sure how I would get that pedal hooked to a balance bar pushing two master cylinders to adjust the brake balance, but I can figure that one out after I get up in the morning.