What Is Total Timing On An Engine?

In engine tuning, the phrase ‘Total Timing’ refers to the greatest amount of Ignition Timing that may be applied. What is the formula for calculating it? Total timing equals the sum of the initial timing and the mechanical advance.

Total timing is a mix of your beginning timing (on the crank) plus the amount of mechanical advance you receive from your distributor. Total timing is calculated as follows: Generally speaking, most normally aspirated engines like complete timing between 34 and 36 degrees BTDC (Before Top Dead Center), often known as ″Advance.″

How does timing affect a car engine?

The ignition and the mechanism by which the spark plugs fire, resulting in a spark in the car’s combustion chamber are referred to as the timing of the vehicle. It is critical that your timing be adjusted correctly in order for your automobile to function at its best, since this has an impact on the speed and efficiency with which the engine fires.

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What are the ignition timing requirements of an engine?

In order for an engine to run properly, a variety of variables must be considered, including the compression ratio, fuel octane, air-fuel ratio, combustion chamber geometry, mixture motion, and inlet air temperature, to mention a few major factors. But, to put it in its simplest terms, timing is determined by the engine’s speed and the amount of load applied.

What is the difference between initial timing and total timing?

Weights or an advance assembly are used to add an amount of advance to the original time. This is referred to as mechanical timing. If a distributor is configured to supply 21° of centrifugal advance, for example, The word ″total timing″ refers to the amount of advance that has been supplied. When the starting timing is added to the mechanical timing, we have reached the last stage.

How do you calculate total timing?

To determine the total timing, which refers to the greatest amount of ignition timing that has been applied to the engine, is quite simple. You may calculate the number by multiplying the original time by the mechanical progress.

Does total timing include vacuum advance?

  • This is how vacuum progress is accomplished.
  • Increased distributor timing is achieved by using high manifold vacuum to shift the diaphragm in the vacuum advance canister when the engine is running at part throttle.
  • Although the vacuum lowers to near zero when the engine is operating at full throttle (WOT), vacuum advance is abolished, and the total timing is obtained by adding the beginning time to the mechanical advance.
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How do I know which ignition timing is best?

In order to optimize leverage on the crankshaft, it is widely accepted that peak cylinder pressure must occur at around 15-18 degrees After Top Dead Center. If the spark timing is begun too early, the cylinder may undergo detonation, which might result in serious damage to the engine.

Does timing affect idle speed?

Is it possible for timing to have an impact on how long a car idles? Yes. If the valve timing is changed (for example, in a car with a spark distributer), a rise in idle speed may be observed at a lower throttle level, which is less economical in cars with a catalyst and varied valve timing settings.

How do you know if your timing is too advanced?

Pinging/Knocking As a result, the fuel and air combination ignites and pushes back against a piston, which is still trying to compress the mixture of gasoline and air. Using a timing that is too far in advance can result in the fuel and air combination igniting too soon, causing pre-ignition.

What should timing advance be at idle?

At idle, the majority of engines have between 5 and 20 degrees of ignition advance. Initial time is the term used to describe this.

How much horsepower is a degree of timing?

A fair rule of thumb is 2 to 3 horsepower per degree.

How much initial timing is too much?

It is dependent on the amount of mechanical advance that is present in the distributor that you are employing. You are in excellent condition if your initial is at least 12* after modifying your total to 34*, in which case your total is at least 12*.

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How does timing affect horsepower?

An engine’s horsepower may be increased significantly by moving the time of the vehicle’s ignition forward. Increasing the ignition timing has the effect of increasing high-end power while decreasing low-end power. It also aids in getting the spark beyond the ignition delay and allowing the engine to run at peak power.

Does advancing timing lean or rich?

If you advance your timing, you will have to richen the fuel mixture, and if you retard your timing, you will have to lean out your carburetor in order for it to work optimally and efficiently.

Which is better mechanical or vacuum advance distributor?

Due to increased timing during periods of low speed, such as gear shifting or stopping, vacuum advance results in improved fuel efficiency and engine performance. It also allows the combustion mixture to burn for a longer amount of time. The use of mechanical advance timing improves engine performance in high-speed applications such as racing car driving, for example.