13-04-2024, 07:30 AM
Hi again
It took me a while to realise that you are presently running fixed advance, which is bound to narrow the power band. You might find it useful to know that the flywheel is 10.25 inches in diameter, so 1.25 inches at the rim represents 14 crank degrees. As I'm sure you will appreciate, that's a bit much at idle/low RPM and not enough at the top end.
The later Ruby engines used a starting setting of about 5 degrees static advance and another 16 degrees centrifugal advance to give a total of about 21 degrees, which is still fairly conservative. If you want to set a manual mechanism for 21 degrees max, that's 1.875 inches at the flywheel.
It took me a while to realise that you are presently running fixed advance, which is bound to narrow the power band. You might find it useful to know that the flywheel is 10.25 inches in diameter, so 1.25 inches at the rim represents 14 crank degrees. As I'm sure you will appreciate, that's a bit much at idle/low RPM and not enough at the top end.
The later Ruby engines used a starting setting of about 5 degrees static advance and another 16 degrees centrifugal advance to give a total of about 21 degrees, which is still fairly conservative. If you want to set a manual mechanism for 21 degrees max, that's 1.875 inches at the flywheel.