BTDC
before top dead centre BrE
before top dead center AmE

For running on 4 star, should I reset to 6 BTDC?

At start the ignition point is 10 BTDC.

Normal ignition point is 6 -8 BTDC.

Normal ignition timing is 58-65 degrees BTDC.

In a vast majority of cases, the angle will be described as a certain angle advanced before top dead center (BTDC).

The firing angle was 30 degrees BTDC, and 15 lbf/in2 (100 kPa) supercharger boost was typical.

This is in contrast to Otto cycle design convention, which calls for combustion just before top dead center (BTDC) in order to allow combustion pressure to build.

Bali Tourism Development Corporation (BTDC) said the toll road project was going to require the reclamation of around 100 m2 of existing mangrove forest.

Timing refers to an angle measurement of when a valve is opened or closed with respect to the piston position (BTDC or ATDC).

"Timing advance" refers to the number of degrees before top dead center (BTDC) that the spark will ignite the air-fuel mixture in the combustion chamber during the compression stroke.

If the engine stalls e.g. cooling fan activation the ignition point is advanced up to 20 BTDC in order to increase the engines torque to restore the idle RPM.

Private organizations like the Bali Tourism Development Corporation (BTDC) and the Lombok Tourism Development Corporation (LTDC) were formed.

Ignition Timing: 9 degrees BTDC (can be altered +/- 2 degrees using CONSULT-II handheld diagnostic tester, e.g. blaZt).

If the timing is retarded for low throttle positions, from perhaps 35 BTDC at normal speeds to TDC or even 10 after TDC at slow idle, the engine runs well without four-stroking.

To facilitate start when coolant temperature is below 0 C the ECU will ground each trigger line 210 times/second between 10 BTDC and 20 ATDC, at which a "multi spark" will appear.

For example, if the ECM/ECU initiates fuel injection when the piston is 10 degrees before TDC, the start of injection, or timing, is said to be 10 BTDC.

For example, if the timing specified by the manufacturer was set at 12 degrees BTDC initially and adjusted to 11 degrees BTDC, it would be referred to as retarded.

Advancing the spark BTDC means that the spark is energized prior to the point where the combustion chamber reaches its minimum size, since the purpose of the power stroke in the engine is to force the combustion chamber to expand.

The KL & FS ATX engines both require 10* BTDC ignition timing while the FS MTX & FP require 12* BTDC.

For example, ignition timing is normally specified as degrees before top dead centre (BTDC) although a very few small and fast-burning engines require a spark just after top dead centre (ATDC), such as the Nissan MA engine with hemispherical combustion chambers, or hydrogen engines.

The advantage of the design should have been very early (0-5 degrees before top dead centre) opening inlet valve.

The timing is measured in degrees of crank angle of the piston before top dead centre.

Its timing is such that the fuel is injected only very slightly before top dead centre of that cylinder's compression stroke.

The nozzle opening was closed by a pin valve lifted by the camshaft to initiate the fuel injection before top dead centre (TDC).

The ignition timing can then be adjusted to fire at the correct point in the engine's rotation, typically a few degrees before top dead centre and advancing with increasing engine speed.

The spark should occur when the piston is 3/16 of an inch before top dead centre (TDC) on all Villiers engines except for the Villiers Mk.

Since only air is compressed in a diesel engine, and fuel is not introduced into the cylinder until shortly before top dead centre (TDC), premature detonation is not an issue and compression ratios are much higher.

For example, ignition timing is normally specified as degrees before top dead centre (BTDC) although a very few small and fast-burning engines require a spark just after top dead centre (ATDC), such as the Nissan MA engine with hemispherical combustion chambers, or hydrogen engines.

The advantage of the design should have been very early (0-5 degrees before top dead centre) opening inlet valve.

The point at which the fuel ignites varies by engine; typically it is about 10 degrees before top dead center.

The timing is measured in degrees of crank angle of the piston before top dead centre.

A Power stroke: When the piston reaches a point just before top dead center, the spark plug ignites the fuel mixture.

Its timing is such that the fuel is injected only very slightly before top dead centre of that cylinder's compression stroke.

Since the Diesel fuel is injected just before top dead center virtually no unburnt fuel is expelled in the exhaust unlike a two-cycle gasoline engine.

In a vast majority of cases, the angle will be described as a certain angle advanced before top dead center (BTDC).

The nozzle opening was closed by a pin valve lifted by the camshaft to initiate the fuel injection before top dead centre (TDC).

The ignition timing can then be adjusted to fire at the correct point in the engine's rotation, typically a few degrees before top dead centre and advancing with increasing engine speed.

This is in contrast to Otto cycle design convention, which calls for combustion just before top dead center (BTDC) in order to allow combustion pressure to build.

The spark should occur when the piston is 3/16 of an inch before top dead centre (TDC) on all Villiers engines except for the Villiers Mk.

"Timing advance" refers to the number of degrees before top dead center (BTDC) that the spark will ignite the air-fuel mixture in the combustion chamber during the compression stroke.

Since only air is compressed in a diesel engine, and fuel is not introduced into the cylinder until shortly before top dead centre (TDC), premature detonation is not an issue and compression ratios are much higher.

Fuel injection started from 135 degrees before top dead center with low compression down to 20 degrees before top dead center with later higher compression engines increasing the hot air factor for ignition and increasing the fuel efficiency.

The scavenging ports are open from about 45 degrees before bottom dead center to about 45 degrees after bottom dead center (this parameter is necessarily symmetrical about bottom dead center) and the fuel is injected at 4 degrees before top dead center.

An engine running on diesel compresses the air inside the cylinder to high pressures and temperatures (compression ratios from 14:1 to 18:1 are common in current diesel engines); the engine generally injects the diesel fuel directly into the cylinder, starting a few degrees before top dead center (TDC) and continuing during the combustion event.

For example, ignition timing is normally specified as degrees before top dead centre (BTDC) although a very few small and fast-burning engines require a spark just after top dead centre (ATDC), such as the Nissan MA engine with hemispherical combustion chambers, or hydrogen engines.