Save weight dump the gear box
 

Save weight dump the gear box

As the project is about removing as much weight as possable.

(No Gearbox) that's a lot for weight, including clutch, flywheel, gear stick assy, comes in at 65kg's 2 x = 130kg's . That would feel like an extra 26hp . Plus will also free up whp as no more gearbox losses, would end up giving back around 30hp for both boxes.Plus the 26 = 56bhp bonus or there about.

Going along the lines of just 1 gear only. A home made centrifugal clutch and using some thing like a vans rear brake drum. will up date as and when.

Feel i need a bigger chlange as this would be.

How about using a small diameter "Long-style" pressure plate clutch from a car, with lower rate coil springs and larger centrifugal weights? That might work- it's kind of how scooter slipper clutch works anyway. Obviously, a fork/throwout and cable/lever arrangement would allow a full disengage, and the preload on the pressure plate could be adjusted by replacing/cutting/shimming the coil springs, and the final lockup could be set by using larger/smaller centrifugal weight rollers.

Larger trucks around here use a drum for the parking brake. Smaller than the actual brake drums (like 11 inches maybe?), and already have a provision to bolt a driveshaft to. Could fit the bill maybe?


Although I admit I have no clue what you are working on...

sorry im doing a fun/race car project looking to get down too 900kg's / 450bhp but doing this saves loads more weight

Thats what im thinking and have one each side for each haftshaft could solve a problem later may be get it to act like a diff.