AFR stands for air to fuel ratio. Fuel doesn't burn on its own. It has to be mixed with air. AFR tells you how many parts of air are mixed with each part of fuel. For example, a 14.7:1 AFR (or just 14.7) means the mixture is 14.7 parts air to one part fuel. When the AFR is ideal, the mixture burns completely during combustion.

So what is meant by a rich or lean AFR? A lower AFR number contains less air than the 14.7: 1 stoichiometric AFR, therefore it is a richer mixture. Conversely, a higher AFR number contains more air and therefore it is a leaner mixture.

2023年3月2日 · Air/Fuel Ratio (AFR) measures how many parts of air are mixed with each part of fuel, and it is essential to have the correct ratio for the engine to function correctly. Stoichiometric Ratio (Stoich) is the ideal AFR at which the mixture burns entirely during combustion.

2008年11月2日 · Slowing down in gear creates a A/F of 22 or so, which is very lean, which makes sense. The engine is pumping more air with only idle-rate gas consumption. At WOT, ROMraider reads 11.25, but a steady 11.25.

Air–fuel ratio (AFR) is the mass ratio of air to a solid, liquid, or gaseous fuel present in a combustion process. The combustion may take place in a controlled manner such as in an internal combustion engine or industrial furnace, or may …

2023年9月26日 · Balancing your AFR is important when it comes to reducing harmful emissions from your vehicle. A lean mixture (higher than 14.7:1) can cause high nitrogen oxide (NOx) emissions, while a rich mixture (lower than 14.7:1) results in increased carbon monoxide (CO) and hydrocarbon (HC) emissions.

2021年6月18日 · A rich air-fuel mixture contains less air than the stoichiometric ratio, whereas a lean mixture contains more air. You can use a scan tool to check the fuel trim data and determine if the engine is running rich or lean.

So what is meant by a “rich” or “lean” AFR? The first number (14.7) in the stoichiometric AFR of 14.7:1 indicates the air content. Therefore a mixture with lower air content than the stoichiometric 14.7:1 is a richer mixture. Rich: Less Air – More Fuel. Conversely, a higher AFR number contains more air and therefore is a leaner mixture.

2024年2月22日 · The lean air-fuel ratio is when there is more air than fuel, while the rich air-fuel ratio is when there is more fuel than air. The air-fuel ratio chart is a valuable tool for tuning your engine. By adjusting the air-fuel ratio, you can optimize your engine’s performance and improve its …

AFR is the mass ratio of air to fuel in an internal combustion engine. The AFR is an important measure for performance-tuning reasons. If exactly enough air is provided to completely burn all of the fuel, the ratio is known as the stoichiometric mixture which is defined as an 14.6 AFR ratio.