09-06-2021, 10:47 PM
How do you guys use the TDC measuring implements?. Ive always found that they dwell considerably at the top, that is they stop moving and you can turn the crank significantly before they move again. Getting an accurate TDC involves either skill or luck.
On any engine (including when setting the valves on my steam roller) I effectivley measure the same piston displacement each side of TDC, mark the flywheel (each side) then split the difference on the circumference of the flywheel with some dividers. And bobs your uncle. A pretty accurate TDC mark.
Just the job if someone has turned the marks off your flywheel, and/or it has some non factory markings.
I have to admit, to get an engine to start an approximate TDC is probably all that is nerded and I time by ear in anycase. So its a bit irrelevant to be, but all you whallas using timing guns should really be quoting degrees before an accurate TDC mark. Not a guessdimate of where it is.
On any engine (including when setting the valves on my steam roller) I effectivley measure the same piston displacement each side of TDC, mark the flywheel (each side) then split the difference on the circumference of the flywheel with some dividers. And bobs your uncle. A pretty accurate TDC mark.
Just the job if someone has turned the marks off your flywheel, and/or it has some non factory markings.
I have to admit, to get an engine to start an approximate TDC is probably all that is nerded and I time by ear in anycase. So its a bit irrelevant to be, but all you whallas using timing guns should really be quoting degrees before an accurate TDC mark. Not a guessdimate of where it is.