I'm making a frankenstein dizzy housing into a cam and crank angle sensor out of all different bits and pieces , all ducciler but from a wide variety of cars.
R20 top housing bored to fit thicker oil seal (all I could buy) , fuego? shaft, custom lid and re used thrust washers.
This dizzy will sit on the end of the cam, attached by two slightly offset teeth that fit into the keyway at the end of the cam, and the dizzy housing and the dizzy shaft are responsible for sealing the oil in the head.
I have two remaining areas of vaugness.
On the engine side of the dizzy is a fibre washer. I have a few of them but first of all would like to know from an engineering point of veiw what is the purpose of the fibre, and does it need renewing or is to fit an old fibre washer acceptable??
The second is how much endfloat should the shaft have in the housing??
I'll be machining the dizzy housing bore to fit the new seal so am in a possition to set endfloat from scratch. I also have a stack of different thickness washers, from 0.3 -0.5 so can make up an ideal amount.
I have read on some americam v8 sites that at temp the gap will shrink to about half if its around 0.2mm but that was probably chevy ford stuff.
How much should I aim for on my dizzy???
I will note that the sensors wont care how much float there is, within sensible limits (2mm or so)
There are no points or anything moving in the housing except for a slotted cylinder and a lump of iron for the magnetic sensor.