Before Top Dead Center (BTDC) is a term used to describe the position of a piston inside an internal combustion engine during its upward stroke. It is a value, measured in degrees, that represents the amount of crankshaft rotation prior to the apex of this stroke.
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with a timing light, assuming this is an older engine that still uses a distributor.
8 Degrees BTDC. ( before top dead center )
the piston in cylinder #1 at the top on the compression stroke
tdc means top dead center, and it refers to the pistons in the engine. this refers to all cars, not just an elantra
No because the epicenter is right on top of the center of the quake.