What is before bottom dead center?

In a reciprocating engine, the dead centre is the position of a piston in which it is either farthest from, or nearest to, the crankshaft. The former is known as Top Dead Centre (TDC) while the latter is known as Bottom Dead Centre (BDC).

1. What is the opposite of top dead center?
2. What does before top dead center mean?
3. What happens at bottom dead center?
4. What are four strokes of the four stroke cycle in the order that they occur?
5. Are all valves closed at TDC?
6. Where should the rotor point at TDC?
7. How much horsepower is a degree of timing?
8. What should my timing advance be?
9. Is TDC on compression or exhaust stroke?
10. Is piston at the bottom of its stroke?
11. What is the lowest point reached by the piston head?
12. What's a compression stroke?
13. Which valve opens first after TDC?
14. What is the difference between 4-stroke and 2?
15. How often does a 4-stroke engine make power to turn the crankshaft?

What is the opposite of top dead center?

TDC – Top Dead Centre is traditionally the position of an internal combustion engine's piston when it is at the very top of its stroke. BDC – Bottom Dead Centre is the opposite, when the piston is at the very bottom of its stroke.

What does before top dead center mean?

Definition: A common term used to indicate the amount of ignition advance. Examples: Setting the ignition timing, so that the spark is initiated before top-dead-center, is necessary because of the time delay before the explosion reaches maximum force.

What happens at bottom dead center?

Bottom dead center is the point at which the piston of an engine is nearest to the axis of the crankshaft. ... When the intake valve opens, the air-fuel mixture is forced into the cylinder by the pressure in the system and the piston moves down to bottom dead center.

What are four strokes of the four stroke cycle in the order that they occur?

An internal-combustion engine goes through four strokes: intake, compression, combustion (power), and exhaust. As the piston moves during each stroke, it turns the crankshaft.

Are all valves closed at TDC?

It's up to you. Both valves should be closed if it's TDC at the end of the compression stroke. If it's TDC at the end of the exhaust stroke, you should be in the valve overlap zone, with the intake valve partially open and on its way to opening fully, and the exhaust valve partially open on its way to closing.

Where should the rotor point at TDC?

The rotor button should be pointing to the number 1 position on the distributor cap when the number 1 piston is at top dead center (on the compression stroke).

How much horsepower is a degree of timing?

2-3 hp per degree is a good rule.

What should my timing advance be?

Most naturally aspirated engines like a total timing of 34 to 36 degrees BTDC, (Before Top Dead Center) AKA "Advance". Nitrous and supercharged engines usually run less than that, unless you plan on blowing the heads off the engine or blowing holes through your pistons.

Is TDC on compression or exhaust stroke?

During approach to (TDC) between compression and power strokes when both valves are closed; there will be pressure that will push your thumb off of the hose to allow air to escape. When air stops blowing out it is fairly near (TDC) on the compression stroke.

Is piston at the bottom of its stroke?

Position A: The location where the piston is at the lower end of the stroke (bottom dead center) and is at Path 1 on the indicator diagram.

What is the lowest point reached by the piston head?

Bottom dead center is the point at which the piston of an engine is nearest to the axis of the crankshaft. On a vertical engine, this is the lowest point that the piston reaches.

What's a compression stroke?

Definition of compression stroke

: the stroke in the cycle of an internal-combustion engine in which the gases are compressed before firing.

Which valve opens first after TDC?

If a piston is at top dead center on the compression stroke, both the intake and exhaust valves should be closed. When at top dead center on the exhaust stroke, the exhaust valve should be open.

What is the difference between 4-stroke and 2?

The main difference between a 4-stroke engine and a 2-stroke engine is that a 4-stroke engine goes through four stages, or two complete revolutions, to complete one power stroke, while a 2-stroke engine goes through 2 stages, or one complete revolution, to complete one power stroke.

How often does a 4-stroke engine make power to turn the crankshaft?

A 4-stroke engine fires once every second rotation of the crankshaft (every fourth stroke of the piston). The four components of the cycle are: induction (the inlet valves open and the fuel/air mixture is admitted as the piston moves outwards from the head of the cylinder);