Simply put, an air-to-fuel ratio is the measure of air compared to fuel involved in the combustion process. For safety reasons, knowing what the air-to-fuel ratio curve is on your burner system is This is what I should try to achieve; Idle 12.5 to 13.2, Cruiseing 14.7 to 15, Max Power 12.6 to 12.8. Column 1 is where I started with the A/F gauge. Carb was jetted up from stock. Column 2 is jetting back to stock for the 670. Column 3, leaning the jetting started to improve the ratio. This is known as the stoichiometric air fuel ratio. This is generally considered acceptable for lean cruising and where factory EFI engines are tuned to operate. Carbureted engines often run slightly richer at part throttle – closer to 13.5 to 13.8:1. For maximum power, the air fuel ratio (AFR) generally will be closer to 12.5:1 to 12.8:1. Just tune the engine so it's running in the 13.5 - 14.7 range most of the time, and don't fret over it. As I told you earlier, it's normal for the ratios to change day to day, even hour by hour, due to climatic changes and engine temps. To achieve the best launch, you have to strike the perfect balance between fuel and air in the chamber. The same is also true with steam boilers. In order to achieve optimum efficiency, your boiler has to be tuned with the proper air/fuel mixture.Too much O2 in your boiler results in the boiler running inefficiently. We dialed in 30 degrees of total timing and ran the A/F ratio at 11.8:1. Run with 114-octane Rockett race fuel, the supercharged 383 produced 643 hp and 589 lb-ft of torque at 11.4 psi. After Tuning with a 5-Gas Analyzer and Wideband Lambda Meter. Cruise rpm: Power mixture and acceleration: You can build your customer the perfect engine but unless it is tuned for the correct formulation of gasoline the engine will not perform like it should. The first person that most customers blame if the engine does not perform like they think it This fuel injector will vary the amount of fuel introduced based on the amount of air being fed into the cylinder. Compression During the compression stroke, both the intake and exhaust valves are closed (many engines have more than 2 but the point is all valves are closed or near closed during this stroke) and the crankshaft is moving upward CYkzL0E.

how to tune air fuel ratio