Temperatures actually tend to peak with that ideal ratio, decreasing both when an engine is running lean and when it’s running rich, Fenske said. High temperatures also correspond to high levels of nitrogen-oxide (NOx) emissions, one of the main pollutants created by internal-combustion engines, Fenkse noted.
Will running rich cause overheating?
Yes! Running rich will make one overheat. And lowering the temperature of the T-stat won’t make one run cooler. Once the T-stat opens you are gonna get what you get as far as temperature!
Is it better to run an engine lean or rich?
Running lean can give you more power but to lean will blow your engine. Running too rich can also hurt your motor. Think of it when you are mixing gas for your weed wacker. It is always safe to add a little more oil than not enough to the mixture.
Is lean hotter than rich?
Fuel lean is the same as oxygen rich. In an engine, the fuel wants to burn efficiently, but not too hot that it starts to melt the pistons, or maybe even violently explode, which will also cause damage.
Does a rich engine run cooler?
Engine runs cooler at rich air-fuel mixture.
What makes more power lean or rich?
If one considers the tipping point between lean and rich as whatever air/fuel ratio yields the best power, then again, slightly rich is most likely the answer. You’ll loose some power vs. your best power ratio but probably not as much as if you went to the lean side.
What happens if an engine runs too lean?
When a gasoline engine runs lean, it burns hotter. That means several things can happen. The air/fuel mixture can pre-ignite, which is bad for the rods, pistons, and bearings. The spark plug electrode can melt.
Why is lean bad for engine?
A lean mixture occurs when there’s a higher concentration of air to fuel than there should be. When this occurs, your engine will likely still run but will result in jerking motions within the mechanics of the combustion engine which in turn leads to damage to the engine, such as burned valves.
Is it OK to run lean?
In combustion engines, “running lean” goes beyond using gas efficiently. In effect, that status makes the engine perform with less gasoline than it needs to operate properly, and it increase the amount of friction between the engine’s moving parts. Running lean can damage an engine.
What does a spark plug look like when running lean?
Spark plugs are generally a brown or grey color, which is caused by normal ignition. However, your spark plugs will become either too clean (evidenced by a lack of normal color) or white when your engine is running significantly lean.
Will running rich burn valves?
If the ratio is too rich, the extra fuel will cause engine soot, carbon buildup on pistons and valves, poor mileage, rough running and can even wash the lubrication off cylinder walls causing damage.
Can timing cause a car to overheat?
A very high degree of timing change might lead to stalling of engine. The piston will be moving upwards and the thrust developed on the piston head due to premature ignition will be converted into heat which overheats the engine. So bad timing can be a cause for engine overheating.
What air fuel ratio is best for power?
It used to be that 12.5:1 was considered the best power ratio, but with improved combustion chambers and hotter ignition systems, the ideal now is around 12.8:1 to 13.2:1. This is roughly 13 parts of air to one part fuel.