Originally Posted by
Connedrod
In real world you dont use this method.
As the piston moves upward it will come to a point were the piston will no longer move. Will call this X. The crank will still move in the same diection with no movement of the piston.
To be completely accurate that position needs to be set with a dial indicator. Normally any probe you can feel it.
Set your zero on both indication devices
Continue the movement till the piston moves downward.
Now reverse the the diection of the crank.
Now note where the the same in reverse as above. Call this X2
Half the difference X-X2
You have X1
This is tdc
OK, so the last detectable upward motion rotating forward, and the last detectable upward motion rotating backward, then split the difference. thanks, I just couldn't get what you were trying to describe the first time.