-SG- David in New Zealand has sent us the below which may help those pondering on the best way to set up a Moore CS1, bearing in mind the not very explicit information in the instruction books of the time.
- Fit the crank bevel to the crankshaft using a fresh woodruff key.
- Fit the oil pump worm drive.
- There is a notch on the crankshaft. Line this up vertically with the dot on the lower bevel and the dot on the lower bevel bearing housing. The piston will be at TDC.
- Insert the bevel shaft with the upper bevel dot to the rear in line with the cam shaft.
- The cam bevel has 3 keyways. One is directly opposite a tooth, one to the left of a tooth and one to the right.
- Choose the keyway on the cam bevel that provides for the cam lobes to be at the bottom of the shaft i.e. inlet and exhaust rockers closed.
- Align the dot on the upper bevel with the dot on the cam bevel.
- The above set up will time as TDC.
- Set up and measure the valve openings / closings as per below to confirm timing.
- NB – if the timings are out you may have to move the cam bevel to a different keyway, thereby advancing or retarding the valve timing. This system of 3 keyways is the precursor to the vernier timing seen in Carroll OHC models from 1930 on.
- Once you have timed your engine you need to check the bevel mesh and backlash.
- Each pair of bevels should mesh together perfectly i.e. the outer edges of the bevels should align.
- The bevels should have between 1 to 2 thou backlash – just a perceptible click – not a clunk!
- Adjust by shimming both bevel gears to retain the perfect mesh.
- Start at the crank and work upwards ... a long and tedious process but essential to trouble free and relatively quiet running.
Crank bevel: 24 t, Lower bevel: 36 t, Lower ratio: 0.66:1
Upper bevel: 27 t, Cam bevel: 36 t, Upper ratio: 1.33:1
Overall ratio: 2:1
Valve Timing Specifications of a 1929 Norton CS1:
Cam details: E2531 Race Cam, re-mastered
Tappets - Inlet: 0.006", Exhaust: 0.010"
The following are measured at the top of the valve stem at the above tappet clearances
Opens BTDC 32°
Closes ABDC 56°
Lobe Centre* 102°
Opens BBDC 62°
Closes ATDC 30°
Lobe Centre* 106°
* Lobe Centre target is between 100° and 105°