Lining up the case split with 0 on the flywheel is OK, but why do folks debate advance numbers with such an arbitrary reference.
So my question is how to be precise about where is TDC. I fabricated a Stop that screws in the spark plug hole. It has a threaded stud to move in and out to contact the piston.
My question is if you just back off the stop so the piston will retract, not contact it, the DEADBAnD at TDC is significant. So, if you advance the stop until contacts the piston, you must rotate the crank 360 until it contacts again. But, this position includes the dead-band in clearances from reverse rotation, so the second datum should be marked by rotation of the crank back in normal direction, right ?
Then, split the difference between marks and that is effective TDC, right ??
So my question is how to be precise about where is TDC. I fabricated a Stop that screws in the spark plug hole. It has a threaded stud to move in and out to contact the piston.
My question is if you just back off the stop so the piston will retract, not contact it, the DEADBAnD at TDC is significant. So, if you advance the stop until contacts the piston, you must rotate the crank 360 until it contacts again. But, this position includes the dead-band in clearances from reverse rotation, so the second datum should be marked by rotation of the crank back in normal direction, right ?
Then, split the difference between marks and that is effective TDC, right ??