Way that then was when valve timing principles were being developed that are the same as today with the piston on tdc exhaust stroke the cam lobes will be in a position so that a bit of crank movement anticlockwise moves the exhaust a bit and a bit clockwise moves the inlet a bit as you bring the piston up on exhaust stroke you will see the exhaust valve starting to close and when you see the inlet valve start to open ( at or very close to TDC) that is called valve rock and that is exact valve timing even today if you have the cam shaft out and want to install it initially bring the piston to tdc and place the cam lobes so one of each would be resting on a valve end , the adjust the teeth mesh to achieve the rock setting as above as for ignition timing it was set by the levers on the steering column ( or for stationary engine , a lever at the distributor )but ran best about 6-10 degrees btdc Compression ratio then would have been around 7 to 1 and leaded fuel with and a octane rating of 85 it was retarded for easy cranking and starting and when running was advanced to the recommended setting
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Way that then was when valve timing principles were being developed that are the same as today
with the piston on tdc exhaust stroke
the cam lobes will be in a position so that a bit of crank movement anticlockwise moves the exhaust a bit and a bit clockwise moves the inlet a bit
as you bring the piston up on exhaust stroke you will see the exhaust valve starting to close and when you see the inlet valve start to open ( at or very close to TDC) that is called valve rock and that is exact valve timing even today
if you have the cam shaft out and want to install it initially bring the piston to tdc and place the cam lobes so one of each would be resting on a valve end , the adjust the teeth mesh to achieve the rock setting as above
as for ignition timing it was set by the levers on the steering column ( or for stationary engine , a lever at the distributor )but ran best about 6-10 degrees btdc Compression ratio then would have been around 7 to 1 and leaded fuel with and a octane rating of 85
it was retarded for easy cranking and starting and when running was advanced to the recommended setting