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No, the stoichiometric ratio of gasoline does not change with the octane rating. Higher octane gasolines (petrols) are more finely refined to only contain the longer hydrocarbon chains, or have additives to bring the octane number up, but they’re ideal combustion ratio is still 14.7:1.Air–fuel ratio is affected by the engine air flow rate at a given engine speed and load mode, and the air flow rate is determined by the intake manifold boost pressure and engine volumetric efficiency.The higher the octane number, the more resistant the gasoline mixture is to knock. Use of higher octane fuels enables higher compression ratios, turbocharging, downsizing/downspeeding, all of which enable greater engine efficiencies.
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What affects air/fuel ratio?
Air–fuel ratio is affected by the engine air flow rate at a given engine speed and load mode, and the air flow rate is determined by the intake manifold boost pressure and engine volumetric efficiency.
Does octane affect fuel efficiency?
The higher the octane number, the more resistant the gasoline mixture is to knock. Use of higher octane fuels enables higher compression ratios, turbocharging, downsizing/downspeeding, all of which enable greater engine efficiencies.
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Does higher octane gas make a difference?
Raising the octane rating (also known as the anti-knock index) doesn’t change the energy content of a gallon of gasoline. A higher octane rating indicates greater resistance to knock, the early combustion of the fuel-air mixture that causes cylinder pressure to spike.
Does higher octane run leaner?
Octane, as you can see, is not a measure of how much power–or, more correctly, specific energy–is contained in a fuel. And remember that leaded high-octane race fuels burn slower than most unleaded fuels, and may reduce performance in stock or lightly modified motorcycles.
What AFR is too lean?
Generally, the engine is considered to be running too lean when fuel trim is above 10% (with the engine running in closed-loop mode). If fuel trim is below -10%, the engine is typically considered to be running rich.
What causes high AFR?
When an air/fuel mixture has too much fuel, it is rich. When there is not enough fuel, it is lean. An AFR higher than stoich = lean. An AFR lower than stoich = rich.
What happens if you put 93 gas in a 87 car?
If you usually fill your tank up with 87-octane gasoline and you accidentally put in a higher octane blend (say, 91, 92, or 93), don’t worry. You’re actually filling your car or truck with a different blend of gas, which means it will burn differently in your engine.
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The octane rating of gasoline essentially tells you how much the air-fuel mixture can be compressed before it will spontaneously ignite.
What happens if I put higher octane fuel in my car?
The higher the octane rating, the less likely a car will experience a “mistime combustion,” which creates the engine knock sound, according to The Drive. A higher-octane gas, such as premium, helps prevent engine knock.
How does octane affect engine performance?
An octane rating is simply a measure of how heat resistant a fuel is in order to prevent knocking. In other words, octane doesn’t enhance combustion — it prevents the air-fuel mixture inside an engine from igniting before it’s supposed to. The higher a fuel’s octane, the more resistant it is to knocking.
When should you use higher octane gas?
Higher octane allows engines to have higher compression ratios (for a more energetic explosion), more advanced ignition timing or forced-air induction like turbochargers or superchargers. They perform best when fed premium fuel.
What happens if you put premium gas in a regular gas car?
Putting Regular Fuel in a Car That Requires Premium
Using lower octane fuel in a vehicle that requires premium gas could cause some serious internal damage. You’ll most likely notice the spark knock (a sort of high-pitched pinging or rattling noise).
Why is 93 gas better?
Regular gas is rated at 87 octane in most states, while premium gas is often rated higher at 91 or 93. Fuel with a higher octane rating can stand up to higher compression before it detonates. Essentially, the higher the octane rating, the lower the likelihood that detonation happens at the wrong time.
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Does higher octane burn cooler?
Higher-octane fuel does not burn hotter. It will not clean out deposits from an engine combustion chamber. And it will not provide any higher fuel economy. But an engine’s octane rating can change over time.
What burns hotter 87 or 91 octane?
Fuel with an 87 octane rating burns more quickly while higher-octane fuels burn more slowly. In engines designed for standard unleaded fuel, efficiency and performance is optimized for 87 octane and could actually perform worse with higher-octane fuel since the burn rate is slower.
Does higher octane burn faster?
Gasoline with a higher octane rating does not self-ignite easily, and burns more evenly than lower-octane fuel under harsh conditions, resisting detonation and knocking.
Is 12 AFR rich or lean?
This condition is where the peak horsepower value is obtained. We typcially like to run a richer AFR here to get the best performance. Best performance for most vehicles is in the 12.5 to 13 AFR range. Going too rich will have the opposite affect and decrease your performance.
Is it better to run lean or rich?
TLDR – running just a little lean could improve fuel economy and give extra power. However, run too lean and you risk engine failure because the engine runs too hot. Whereas running rich can waste fuel and increase pollution but will not damage the engine. You ideally want to run at the perfect ratio of 14.7:1.
What is perfect air/fuel ratio?
Through determining their chemical composition, all fuels are assigned what is called a stoichiometric air to fuel ratio, with 14.7:1 being the perfect value determined for pure gasoline.
How rich is too rich AFR?
The speed of the flame front is dependent on mixture density and AFR. A richer or leaner AFR than about 12-13 AFR burns slower. A denser mixture burns faster. So with a turbo under boost the mixture density raises and results in a faster burning mixture.
What AFR makes the most power?
Maximum power is usually found between 12-14:1, but this may be too lean for safety on many engines. For maximum reliability at full power, air/ fuel ratios from 10.5-12.5:1 are considered best, depending on the engine.
Does running rich damage engine?
When a car is running rich, it means the engine is injecting too much fuel and too little air for perfect combustion. This will not only lead to a high fuel consumption bill, but it can also cause damage to costly parts like the catalytic converter if you are unlucky.
Does 93 octane add horsepower?
Premium, also known as 93 octane gasoline, is the most expensive gasoline at the pump. Premium gasoline does and does not give more horsepower, depending on the type of automotive engine it is used in.
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Does octane really matter?
If it says to use fuel with an octane rating of 87, filling your tank with a higher-octane fuel doesn’t provide any extra benefits to your engine. If your vehicle manual says to use fuel with an octane rating of 89, going below that grade can affect your engine’s performance and fuel efficiency.
Can 93 gas mess up your car?
“Use premium unleaded gasoline with a posted octane rating of 91 or higher. If the octane rating is less than 91, you could damage the engine and may void your vehicle warranty. If heavy knocking is heard when using gasoline rated at 91 octane or higher, the engine needs service.”
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