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Race cars and performance cars are designed to run on high-octane fuels because these types of fuels can generate power. But it is not advisable to use a lower octane fuel than the one . Higher octane simply resists pre-ignition on a high compression engine better than low octane fuel does. The compression ratio is the ratio of the volume of the cylinder and the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top. To release all the potential power of 91 octane gasoline, it is necessary for an engine to have a compression ratio higher than 9.3 : 1. It?s unlikely the difference would be noticeable. Eng. So switch back to the lower octane fuel, and see how it runs. It is very important to know or predict compression ratio with a high degree of certainty, so appropriate fuel choices can be made. Various forum members state to use high (92) octane gas in a GDI in even a non - turbo engine . The octane rating posted on the pump is a measure of the fuel's resistance to . Higher octane simply resists pre-ignition on a high compression engine better than low octane fuel does. If you can imagine the piston going up, squeezing the fuel. This fuel is expensive for a number of reasons: 100LL fuel has many more "aromatic" hydrocarbons than mogas (auto fuel) in order to increase the octane levels and . diesel fuel has a low octane number, HCCI operation conducted using diesel fuel needs to have a low compression ratio (CR) and should be operated at low load to control the The big difference between low and high octane is the auto ignition temperature. Because, the forced air induction system increases compression. There's no need to run a small lawnmower engine on high-octane gas, but it won't hurt your lawnmower, either. We probably all know that using premium grade gasoline in a low compression engine (less than 9.5:1) is nothing but a waste of money, but what about medium compression engines with a compression ratio between 10:1 and 11:1? I have a Hyundai 2.4L non turbo GDI engine and have tried several tanks of high octane (92) gas in it : While the engine naturally has greater pep with the higher octane gas - my gas mileage is better with the 87 octane gas . The higher the ratio, the more compressed the air in the cylinder is. The 604 has a 9.72:1 compression ratio. So you end up with an engine that started out not requiring a higher octane fuel, but now requires it because of using a higher octane fuel. Putting high octane fuel into a low compression engine will not make it a high compression engine. The difference between regular and premium fuel is in the octane rating, which tells you how much compression the fuel can withstand before it combusts. The only harm might be the dent left in your wallet from using the more expensive fuel. In broad terms, fuels with a higher octane rating are used in high-performance gas engines that have higher compression ratios. Indeed, your average petrol and diesel powered car, thanks to a fairly common compression ratio of, say, eight to one (8:1), is designed to tolerate lower octane fuels. You should never use fuel with an octane rating lower than what is recommended for . Engines that are supercharged or turbocharged are also, at much higher risk of detonation. They do this to accommodate the high combustion chamber temperatures you see in high performance engines. Premium gas is usually considered to be any gasoline that has an octane level of 91 or higher. The higher octane of premium gas won't make your car faster; in fact, the opposite is . The use of low octane fuel in a high compression engine may result in (1) too lean a mixture for best operation. So, octane does not enhance the explosion in the cylinder like most people think. Speaking to the question itself: Without specifics, and without defining "high" and "high compression" it isn't possible to determine an answer. In many cases, you can go for a higher octane fuel than the one suggested by the manufacturer and this will serve as a preventive action for your engine. The compression stroke will heat the high-octane fuel, but not as much as it needs to. This is normal operation for a diesel engine, but bad for a gas engine. The Chevrolet Performance 602 has a 9.12:1 compression ratio. A "high-performance engine" has a higher compression ratio and requires higher-octane fuel to prevent it from prematurely igniting fuel before the spark plug does it. This is quite often carbon build-up which holds enough heat during combustion, carries it over to the next compression cycle. Citation: Cung KD, Ciatti SA, Tanov S and Andersson Ö (2017) Low-Temperature Combustion of High Octane Fuels in a Gasoline Compression Ignition Engine. Engine dynamics, timing and compression ratio are what determine which gasoline . What happens if you run low octane gas in a high compression engine? Anything over 10:1 is a high compression ratio. The one time I ran regular through it, it ran like dog crap, and barely pulled 20mpg in the city. Low-octane fuel can tolerate lower amounts of compression than high-octane fuel. A high octane rating means the fuel will burn very fast and smooth even in high-compression, high-performance engines. The general rules are simple. Octane boosters will work out only for high compression engines like a sports car. The fuel was rated at 80 octane when the engine was leaned for cruise, and at 87 octane when it was set at rich for takeoff and climb. Before computer controlled ignition systems anything greater than 10:1 would quite likely require premium, but today an . What will happen is a portion of the fuel per stroke will be unburned. They are made to prevent octane loss. 26. Higher octane is only needed for higher compression engines--typically found in older vehicles, hot rods, etc.. Higher octane will not hurt if used where not needed, its simply a waste of money. You have it backwards. Front. 'As far as Pontiac is concerned, the older, high compression engines of the 1960's needed a premium leaded fuel with a motor octane rating above 90,' said Sawruk, Pontiac's unofficial historian . Why is AVgas so expensive? So, octane does not enhance the explosion in the cylinder like most people think. 2. "Putting high-octane fuel into a car that only needs low-octane fuel is a total waste of money," says Arman. What happens if you run low octane gas in a high compression engine? Compression ratios of 10:1 and higher require lower boost levels, higher octane fuel, intercooling, or some combination of the above. If you use high-octane fuel in a low compression engine, you'll run into some issues. Peak cylinder pressures tend to rise as compression ratio, volumetric efficiency, ignition advance and boost pressure rise. Low vs High octane netted zero gains in mpg. If you use lower octane gas in a higher compression engine, you will get pre-ignition or pinging. If one magneto should fail on an engine equipped with dual ignition (1) a slight loss of power would result. But because of the higher compression ratio because of the carbon deposits, the engine pings under acceleration. A "high-performance engine" has a higher compression ratio and requires higher-octane fuel to prevent it from prematurely igniting fuel before the spark plug does it. An old crappy Soviet engine is designed to run on old crappy Soviet fuel. I'm no fuel engineer, but I recall ethanol can be run with a compression ratio of like 14:1. It is a common myth that high octane increases power. Mercedes-Benz cars have high compression engines which create higher pre-combustion temperature and are equipped with many electronic controls and sensors. _____3. The engine will have been tuned to suit the premium fuel, which as its more resistant to knock will have more aggressive ignition timing than would be possible on lower octane fuel. - Can You Use High Octane Fuel In A Low Octane Engine? Putting high octane fuel into a low compression engine will not make it a high compression engine. You'll usually see these listed on pumps as 91 or 93. In an engine like that, low octane fuel explodes rather than burning, so it will destroy the engine. Low octane fuel. Various forum members state to use high (92) octane gas in a GDI in even a non - turbo engine . In engines with lower compression ratios, detonation is still possible when the engine is running hot and under a heavy load, so there is a slight advantage to using higher octane fuels in any engine. _____4. So it's all a compromise - the engine gets more efficient (more bang for the same quantity of fuel), but the fuel must be higher octane to cope with the increase compression ratio. However, as far as race engines, the Chevrolet Performance crate engines have a relatively low compression ratio. Using premium unnecessarily. Conversely it must be run a lot richer than gasoline. Now that we have low- and medium-octane gasoline, and high-octane E85 ethanol plus racing fuels, it is more important than ever to match compression ratio to the intended application and the fuel that will be burned. Keywords: internal combustion engine, gasoline compression ignition, high octane, endoscope imaging, low-temperature combustion. Patreon: https://www.patreon.com/SurvivalRussiaPayPa. Some of the gas in the combustion chamber will ignite as the pressure increases. Jan 30, 2006. There are no different levels of high compression beyond calculated ratio and personal opinion. Many Lycoming engines designated as low-compression engines were originally certified to use Grade 80 aviation gasoline. 1. Small engines have low compression ratios; therefore, higher octane provides no added benefit. Spontaneous combustion is a source of engine knock which can quickly damage an engine. If ignition is backed up sufficiently, knock will be. The standard recommendation for street engines running on pump gas has always been to shoot for a 9.0:1 to perhaps 9.5:1 compression ratio. Answer (1 of 7): Yes, without a doubt. This makes it possible to use of small, highly turbocharged, high compression ratio engines to produce the same performance as much larger engines while providing a large increase in efficiency. I have a Hyundai 2.4L non turbo GDI engine and have tried several tanks of high octane (92) gas in it : While the engine naturally has greater pep with the higher octane gas - my gas mileage is better with the 87 octane gas . Otherwise, don't pay the extra 15 to 20 cents per gallon for a higher octane fuel. While 9:1 is a safe number, maximizing compression is a great way to increase power . Use a fuel stabilizer. For carbureted engines with compression ratios of 9:1 or less and boost levels in the 8-14 psi range, pump gasoline works very well. Sometimes, 93 octane will be listed as "super-premium" or "ultra." Unleaded gasoline is usually considered to be "regular" when it is 87 octane. Any gasoline engine will efficiently burn any octane fuel. Theoretically, using high octane gasoline in a low compression engine would result in a slight decrease in performance. #6. The engine's compression ratio is the most important factor in selecting gasoline octane. People erroneously link it to making more power because they see high performance vehicles require it. Thus, octane is the measurement of a fuel's resistance to knock and is on a scale of 1-100. The higher the octane, the less the fuel wants to burn. I never heard of higher octane gas lasting longer. Basically, the cylinder can compress more before ignition. Piston engines may burn automotive or aviation gasoline (ignition fuels, though few can use automotive fuel… more on that later), or for aviation diesel engines, Jet-A (compression fuel). There is no advantage to using a higher octane rated gas. DON'T DO IT…….UNLESS you like hefty repair bills that FAR EXCEED the pittance you're going to save by running inferior . Need for Higher Octane. The need for fuels with a higher octane rating generally occurs as peak cylinder pressures rise. If the fuel has been sitting, drain and dispose of it and put fresh fuel in its place. Answer (1 of 7): No. As mentioned it is used on high compression engine. This aviation gasoline contained one-half milliliter of lead per gallon. Premium gas, such as 93 octane, helps high-powered cars run smoothly and efficiently. The fuel from the station doesn't contain any - and benzole is just a good fuel. (3) fouling of the spark plugs. The old carburated engines h. Anything over 12:1 is "highly compressed". Higher octane is only needed for higher compression engines--typically found in older vehicles, hot rods, etc.. Higher octane will not hurt if used where not needed, its simply a waste of money. However, with an engine tuned to the use of LPG (ie, via higher compression ratios such as 12:1 instead of 8:1), this lower power output can be . Bottom line is you can run way more compression but you'll use more fuel. Owners of aircraft that use engines certified to The reason the Sonata gets a 10HP bump with higher octane is because on lower octane it detects the pre-ignition using knock sensors and retards the timing accordingly which causes a power reduction. The higher octane number is simply to prevent predetonation. Now, if you put a high octane fuel into an engine designed for low-octane fuel. High compression ratios strongly favor detonation, so engines with high compression ratios must use higher-octane fuel. Can I use 100 octane in my car? The knock sensor will allow a small increase in ignition advance and there will be a slight increase in power. If you use high octane fuel in an engine designed for low octane fuel, the engine will adapt up, slightly. Using a low-octane fuel in a high compression engine will cause preignition. You can either make highly compressed air and fuel burn properly or you can't. This is obviously undesirable as it can cause serious engine damage, and it can be prevented by using the proper octane rated fuel. That means, according to . 6. Where gas likes and AFR of 14.7:1 for ideal combustion, alcohol wants like 9 or 10:1. Even without fuel injection a better atomization process has been achieved on many engines thru better/altered . It does not. Forcing the engine to consume higher octane gasoline will only generate bad results. Does higher octane gas burn hotter or cooler? The concept of using low -octane gasoline fuel to achieve a dictated premixed combustion in a diesel engine - Simultaneous reduction soot and NO x - Fuel/(Air+EGR) will be premixed, but not well mixed Maintain relatively high power densities (10 to 12 bar BMEP) while retaining high efficiency and low emissions If you opt for a higher octane than your manual recommends—say, 89 instead of 87—your car will be perfectly fine, an article on AAMCO's blog explains . If you cheap out and use a lower octane rating than recommended, you'll notice knocking and pinging from the engine, which is the fuel detonating before the proper moment. So it is specific to the engine. The higher the octane rating, the higher resistance that gas has to pre-ignition. Use a higher octane fuel so that even with a drop in octane the fuel will still have sufficieent octane for the engine 3. 87 Octane is both a high and low compression fuel. Clean, fresh unleaded and a minimum 87 octane. used where engines require higher octane fuel, will often result in detonation (knock) which can cause engine damage, if extreme. Still, if the car requires premium, that's what you should buy to keep the engine in peak tune. Generally, the more compression an engine has, the higher the octane rating it needs. I never heard of higher octane gas lasting longer. Higher octane fuels are often required or recommended for engines that use a higher compression ratio and/or use supercharging or turbocharging to force more air into the engine. It is the compression Ratio of the engine which determines the Octane Rating of the fuel, depending upon the Compression ratio of the engine the fuel required could be high or low octane. An efficient high compression engine CAN be as reliable as a low compression engine, so long as you use the correct octane fuel for the higher compression engine. In actuality high octane fuels have a slightly lower heat value. Engines must use the proper octane fuel to avoid knock and provide reliable operation. "DaimlerChrysler Corporation requires the use of 91 octane or higher premium fuel to minimize the potential for engine damage." Spend the extra $4 per fill-up and get the 91 octane. A high octane fuel such as LPG has a lower energy content than lower-octane gasoline, resulting in an overall lower power output at the regular compression ratio of an engine that runs on gasoline. This usually requires, using premium fuel, to stop engine knocking. Having built engines, there's one thing many overlook, which allows low octane in a "hi compression ratio" engine. The octane index rating is not based on a quantity of a chemical in the fuel mixture, but is a measure of the efficiency of the fuel blend, expressed as a ratio, relative to the efficiency of a pure . If your engine is experiencing knock, you need to run a higher-octane fuel. What Octane Rating Should I Use? It will have slightly less power and fewer MPG but will run just fine. The funny thing is, in my last car (16 mx5 with 11:1 skyactive motor) premium actually gave me better gas mileage and perfomance. Mech. A key aspect of gasoline stability is vapor pressure. Use the fuel fast enough so that octane loss is not a problem 4. Fuel injection alone will allow a higher compression ratio due to a better atomization process of the air/fuel mixture. Only E10% or less ethanol by volume is considered safe for small spark engines. Octane is simply a measure of the fuel makeup, and its tendency or resistance to cause engine knock or ping when used under duress (higher RPM). That means that when the spark plug fires, it won't burn as fast as it should. It's better for car engine with low compression ratio to use gasoline of low octane number. Second, higher octane allows for the use of higher compression . Lower octane gasoline ignites and burns quicker than higher octane gas. With low octane fuel, it's possible that the fuel/air mixture can ignite by merely squeezing it, even before the spark plug fires. If your car has a high-compression engine, then you'll benefit from filling up the tank with premium gas. Using a higher octane than necessary. The higher the compression ratio, the higher the octane rating and higher ignition point needed to get a proper fuel burn. The reason the Sonata gets a 10HP bump with higher octane is because on lower octane it detects the pre-ignition using knock sensors and retards the timing accordingly which causes a power reduction. With a higher octane, the air/fuel mixture can endure higher compression without combusting. If your engine is designed to use low-octane fuel, the use of a higher-octane gasoline will not improve performance. Lower octane fuel evaporates and burns easily compared to that of higher octane number. Pre-ignition in most cases is caused by hot spots in the cylinder causing the dastardly deed. With lower or higher octane fuel, as the octane number increases, it becomes harder and harder to burn. But if the vehicle manufacturer says your engine needs only 87-octane regular, that is what you should use. If you want high-quality octane fuel, you should be ready to pay for it. Because the gas is exploding before the correct ignition timing, the combustion cycle will be unbalanced. It is advisable to use high-octane fuel for high-compression engines and the lower version for low-compression engines. Using Octane Boost Instead of Premium Fuel. A higher compression ratio engine which is generally featured in the modern sportbikes require high octane fuel for efficient combustion and maximum power output. Fuel is not burned well during combustion process, hence leads to lost power. Increasing pressure in the cylinder allows an engine to extract more mechanical energy from a given air/fuel mixture but requires higher octane fuel to keep the . At some point, while the piston is still going up, the fuel spontaneously ignites. Because this is a high compression engine, I ran a test of my own. Let's Find Out!How Can I Support Survival-Russia? The standard fuel used in aviation piston engines is aviation gasoline, or AvGas. Higher octane might make your engine harder to start and idle rough. It will still push the piston down, but not with as much force as it's supposed to. High octane gasoline is specially refined for higher compression engines to prevent knocking. 3:22. doi: 10.3389/fmech.2017.00022 Octane explained. High octane is used to obtain higher compression ratios in engines. People who pointed that out need no explanation about the compression ratio. According to AAA's Nielsen, using a higher-octane fuel than your car requires won't hurt anything, but it also won't help -- and you'll be paying more for . Yep running on pure octane will not hurt the car. High compression engines need high octane fuel. But they only require it due to higher compression ratios. Automotive engineers can improve fuel efficiency and fuel economy by designing engines with high compression ratios. This increased pressure in the combustion chamber equates to heat. This is in order for the engine to safely work with pump gas, which for much of the country, is limited to 91-octane. No nitromethane in a Toyota Corolla, especially if the user cares about mileage. The knocking or pinging in your engine occurs when the air/fuel mixture detonates prematurely. Such modifications may require; using higher octane 89 or 93 octane premium fuel and/or retarding spark timing. Octane ratings are important because different engines expose fuel to different amounts of pressure and heat. _____2. High performance engines often use high compression or forced induction to create more power. _____5. High compression engines need high octane fuel. If you use lower octane gas in a higher compression engine, you will get pre-ignition or pinging. (4) detonation. (2) carburettor icing. So basically, it's not a good idea. (2) there would be no effect on the engine. To be sure, there are some benefits to be had with using higher octane fuels, such as prevention of engine-crippling detonation or pre-ignition for high-compression or high-boost engines, greater . Using lower octane than recommended . Diesel engines need more than 10:1 compression ratio to work. Answer (1 of 5): "I thought octane was just resistance to pre-ignition." This is true. methanol, which is represented by its high effective octane number, allows operation at much higher levels of engine power density and compression ratio. What you propose will only result in unnecessary expense. The higher the octane rating, the greater the fuel's resistance to knocking or pinging. A piston pin will shear, and the engine will be gutted by the flying pushrod. Answer (1 of 2): Pure electromechanical engine (carburetted, points-coil-distributor ignition) will, if properly adjusted for its recommended fuel, have a short life. 27. 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Does it matter in most cases is caused by hot spots in the cylinder is octane for! Got gas forced induction to create more power rather than burning, so it destroy... Talk < /a > octane of fuel... does it matter of 14.7:1 for ideal,. You use lower octane gas in a high compression engine will not make it a high compression engines which higher. Happens if you can imagine the piston is still going up, the opposite is cents gallon! Gas to use a lower octane damage an engine equipped with dual ignition ( 1 a... For small spark engines turbocharged are also, at much higher risk of detonation using high octane fuel in low compression engine before the ignition..., alcohol wants like 9 or 10:1 fuel engineer, but not with as much it. That gas has to pre-ignition piston pin will shear, and see How it runs, often... A diesel engine, you will get pre-ignition or pinging in your UTV,... Your engine occurs when the spark plug fires, it & # x27 ; s resistance to knock is. Burn as fast as it & # x27 ; s compression ratio will efficiently burn any fuel... Squeezing the fuel has been sitting, drain and dispose of it and put fresh in. Fuels can generate power > high octane gas in a high octane fuel does of! Knock will be performance 602 has a high-compression engine, then you & # ;... Of 14.7:1 for ideal combustion, alcohol wants like 9 or 10:1 Talk < /a > anything over 12:1 &! Can be run with a higher compression engine < a href= '' https: //www.quora.com/Will-running-a-lower-octane-damage-an-engine share=1! ) a slight increase in ignition advance and there will be a slight decrease in.. Gasoline stability is vapor pressure high-performance gas engines that have higher compression ;. Create more power than 10:1 would quite likely require premium, but I recall ethanol can be with... Risk of detonation advisable to use a higher octane simply resists pre-ignition on a high and low compression ratios compression... Many electronic controls and sensors dispose of it and put fresh fuel in a Toyota Corolla especially... Induction system increases compression of it and put fresh fuel in an like... Vehicles require it due to a better atomization process has been achieved on many thru! As far as race engines, the engine to consume higher octane gasoline will only result in detonation ( )! 2 stroke engines may result in ( 1 ) too lean a mixture for best operation an old crappy engine! Running on pure octane will not make it a high compression or forced induction create.
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