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Old 05-18-2012, 07:16 PM   #12
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ozmoses's Avatar
Joined: Jul 2009
Location: USA
Oddometer: 4,477
Think of the valve as, well, a valve or perhaps a door. Open is open, closed is closed.

Opens into combustion chamber. Closes at (in) the head.

Take a length of coat hanger, or stiff wire & insert into the spark plug hole; as the piston rise in the bore it will push the wire ahead of it. When it stops pushing, this is TDC for that particular cylinder.
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