noise from fresh clutch

[Mike]

Mine seems quiet when bone cold, and gets loud once the car warms up. Push the pedal in, and the noise goes away.

[Knockenwelle]

Transmission rattle, especially behind cammed engines, is caused by slight variations in engine RPM. Motors do not idle at a constant RPM, rather they accelerate each time a cylinder fires in a pulsing pattern. Big cams exacerbate this behavior due to partial misfires caused by valve overlap. The alternating acceleration and deceleration of the input shaft loads the shafts and internal parts one way, then the other, causing a light cracking noise as the gears take up lash and knock against each other. Thicker oil acts as cushion between the gears, making the noise quieter when cold. The flywheel is the primary tool used to soak up these torsional oscillations through rotational inertia, and light flywheels just have less damping effect. There's nothing (?) wrong with your transmissions.

[10yre30r]

Knockenwelle......yes..! My car starts cold and its fine.... it warms up and my tranny starts to rattle when i have it in neutral. If i press the clutch it goes away. When it rattles it rattles at the rhythm of the motor ......rather they accelerate each time a cylinder fires in a pulsing pattern exactly as you described.