Frequently mixing 87 and 89 octane?
Read the owner's manual if it says that it only needs 87 octane than no you wont be hurting it, on the other hand using a lower octane rating in an engine designed for 89 or higher will damage the engine. Using the incorrect gas will lead to rough idling and a "pinging" sound in the engine this "knock" is the cylinders misfiring causing scoring to happen which over time will lead to potential expensive repairs. Double check the owners manual be sure to put the correct octane rating in the engine so you don't damage the engine. Also most people don't know higher octane rating can lead to better gas millage and more horsepower... its not alot just 3 or 4 more horsepower.... just so u know lol
What are the expected damages to a car when putting 87 octane gas when 91 octane is “recommended”?
For a modern car, the damage would be reduced performance and lower fuel economy.Higher octane allows for higher compression ratio by avoiding knock (premature spontaneous detonation). This increases fuel economy and power. However, if the modern engine detects knock or pre knock, it retards spark timing and injection timing to avoid knock. Both of those hurt economy but prevent knock.Knock won't happen in a modern engine unless you are severely off the map for octane rating or something is wrong.
What happens when you mix gasoline of different octanes?
You get gasoline with the combined octane. If you mix a half tank of 91 octane and a half tank of 89 octane, you end up with a full tank of 90 octane.Unless you are driving a car that requires 93 octane, you won’t damage a thing.Reality check here: Gas stations that provide three different octane grades of fuel only have two storage tanks of gasoline. One tank of regular unleaded gasoline and one tank of premium octane gasoline. The pump mixes 1/2 from each tank to get the midgrade gasoline.All three grades are the same exact gasoline, except for the octane booster. That is the only difference. This is why using gasoline of a higher octane than your car needs is a waste of money.You aren’t going to damage your engine using a higher octane fuel than necessary, but you will waste your money. Higher octane only prevents detonation due to high compression engine needs. It does NOT provide more power for your low compression engine. Using higher octane fuels than necessary may also reduce gas mileage somewhat as the higher octane resists detonation in the cylinders and the fuel/air charge may not burn properly for your low octane needs engine.
What happens if I mix 91 octane with 93 octane? My car requires 91 or higher, but sometimes I mix at a half tank because 91 is cheaper.
The Octane rating is a measure of how much compression the fuel can endure without spontaneously exploding.The higher the Octane number, the higher the resistance to detonation.This is important for the type of vehicle you drive. If it is a run of the mill engine the compression in the cylinders isn’t very high and there is little chance of gasoline detonating before the spark plug ignites it. Thus your manual may specify a minimum Octane of 83 for that particular engine. Using a higher Octane rated gasoline will not hurt your engine at all. It will just hurt your wallet.With something like a sports car engine you have much higher compression in the cylinders to get every last bit of horsepower out of the engine. These engines require a much higher Octane or the gasoline will detonate from the compression before the spark plug fires. This creates a ‘knocking’ noise and is referred to as ‘Detonation’. In bad cases it can punch holes in the top of pistons.New computer controlled cars have ‘Knock-sensors’. When the detonation is detected they can automatically retard the engine timing until the knock goes away. So in an emergency you can use a lower Octane to get you home without fear of destroying your engine. Your penalty is in engine performance.In much older cars without computers this is not possible. The knock could grenade the engine.To compute Octane from mixing two or more grades of gasoline is relatively simple. You see this a lot with race cars that require very high Octane levels with their super high engine compressions.Here is the formula taken off the Sunoco racing website:( [ % Fuel A ] x [ Octane of Fuel A ] ) + ( [ % Fuel B ] x [ Octane of Fuel B ] ) = Octane of MixtureHere’s an example. Let’s say you mix 3 gallons of 110 with 2 gallons of 100 and you want to know the octane of the resulting 5 gallon mixture.The percentage of 110 in the mix is 3/5 = 0.60 (60%).The percentage of the 100 octane fuel in the mix is 2/5 = 0.40 ( 40%).Plugging the information into the equation:(0.60 x 110) + (0.40 x 100) = 66 + 40 = 106So the octane of the resulting mixture is 106.Here is the result of what detonation does to a piston:
What happens if you mix 93 and 87 and 89 octane gas together of 3 different gas stations?
Octane number is measure of how far the engine can go without detonation- in terms of spark timing. If car is not antique, it should have the knock sensor, which will do all the "thinking" about that matter. Looks like you're from the states, here in Europe we have only one gasoline type, that is 98-Lead-less. But as far as the car is concerned it'll run on anything from ethanol to kerosene. P.S. Diesel not included :D
What does 89 octane do to a 87 octane car?
Most people who promote the use of higher octane fuel generally believe the higher the octane rating, the better/hotter the fuel burns, generating more power and efficiency. This is incorrect, in fact its quite the opposite. The higher the octane rating, the slower the fuel burns and there is less total energy per gallon in higher octane fuels. The purpose of octane is to resist the spark knock, or instantaneous (and inappropriate) ignition from compression (instead of the spark plug). Increasing engine compression and ignition timing generally improves overall engine performance, but creates higher cylinder temperatures and pressures and this is where higher octane comes into play. It is a fuel formulated to support the higher performance attributes. If your engine is not designed with these features, it will not benefit from high octane fuel, and in fact will have less power and fuel economy. There is also the potential for carbon buildup and catalytic contamination as the result is an incomplete mixture burn with the slower burning, higher octane fuel. An interesting side note, octane is a hydrocarbon chain with 8 carbon atoms chained together and resists pre-ignition from compression very well, while heptane (9 atoms) handles compression very poorly.
Is it okay to mix 87 fuel to 93 octane fuel?
you're good to go'the engine wont know it happened.it may even thank you in fuel milige. mk
If I mix 87 and 91 octane rated gasoline what happens?
The octane rating is actually the combustibility rating. lower octane means lower compression to flash point. typically normal cars do not need higher octane gasoline, where as higher performance engines with higher compression cylinders or super/turbo charged engines require higher octane gasoline. Meaning putting low octane in a high compression the gas will detonate rather than burn which causes engine knock, which can ultimately destroy your motor. ALWAYS go by what your gas cap says. a car that is supposed to run on regular can run on premium, but you will not see any improvements in drivability and performance.
Mixing premium and unleaded fuel causes check engine light to come on?
A few days ago I put Shell's V-Power fuel into my 2001 honda civic lx, and it already had about 1/8th tank of unleaded fuel, and I put about half a tank of shells premium. Everything worked fine for the first day then after I was driving for about 45 minutes the next day everytime I gave it anything over about half throttle it would barely go... And then the check engine light came on and its still doing the same thing. And everyone keeps telling me that its cause I put premium in it but that sounds kind of stupid... So, if anyone knows what could be causing this I would really appreciate the help!