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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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Q: What is Before top dead center?
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Will top dead center work for 10 degree below top dead center?

TDC is 0 degrees TDC, not 10 degrees BTDC which is before top dead center. ATDC is after top dead center. Both of these in relation to piston height are "below top dead center".


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When timing gears are installed with timing marks aligned on a 351 w is the engine at 1 top dead center?

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What does BTDC stand for to do with cars?

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What marks do you use to time a ga15 Nissan motor?

looking at the timing marks from the top left to right you have 5 degrees after top dead center, then top dead center then 5 degres 10, 15 then 20 befor top dead center. the timing is 7 degrees before top dead center


What do the timing marks look like for a 94 Chevy C1500 350?

It is look like ruler with 0, 10, 20 number XXXXXXXXXXXXXXXXXXXXXXXXXXXXX The timing scale will have an "A" at the top and a "B" on the bottom. In the center is a "0". The "A" is for after top dead center. The "B" is for before top dead center. Each mark on the scale is 2 degrees. Timing is always set on before top dead center.


Does the piston need to be at top dead center when the spark plug ignites?

The piston will usually be a few degrees before top center.


What position should the crankshaft be on when setting the motor up with the distributar 5 10 15 or 20 degrees before top dead center?

93-98 240sx timing is 18-22 before top dead center


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What is the timing for a 1990 Honda Accord?

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What is the timing for a 1967 Chevy Impala before top dead center?

what engine do you have in your impala?


What is top dead center on cars?

The top dead cente