I use regular unleaded and I do experience engine knocking, will switching to premium reduce the knocking and should I empty my tank before switching? Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Close up hand of man pumping gasoline fuel in car at gas station.
Share Share. What Is Premium Gas? In simple terms? What Is Engine Knocking? One last thing to remember: If you want to get the most out of your vehicle, running the right fuel is certainly a great place to start. Kate McKnight.
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How about using alcohol free gasoline? What about using alcohol free gasoline? Leave a reply Cancel reply Your email address will not be published. More in Car Care Advice. Look for these 5 things when shopping for a used Goodbye, Check Engine Anxiety!
If the manufacturer of your car recommends regular grade gasoline, you may wonder if premium will provide added benefits. On the other hand, if the automaker says premium gasoline is "recommended" or "required," you may have considered filling up with regular to save 30 to 50 cents-per-gallon.
Do either of these options make sense and, more importantly, could they cause any problems? Gasoline Octane. Image: U. Oh well. The Charger's manual says 87 octane will provide "satisfactory fuel economy and performance. Similar to the BMW, the Dodge's gains on the dyno 14 horsepower and 23 lb-ft of torque translated into negligible improvement in our real-world acceleration testing. Saddled with elephantine heft and eager to spin its rear all-season tires at launch, the Charger posted the same 4.
At triple-digit speeds, the higher power on 93 octane gave the Charger an advantage measured in tenths of a second. The Dodge also posted a 0. Just as important, the bellicose roar of the iron-block Hemi and the Charger's ability to reduce its rear tires to jungle-gym ground cover are unaffected by the fuel in the tank. While Ford's EcoBoost F stands out as an obvious exception, the Dodge Charger's numbers make for a tidy summary of our findings.
If you buy fuel with an octane rating above the manufacturer's requirement, you're likely to feel it in your wallet more than the seat of your pants. How your engine constantly invites and silences engine knock to estimate a fuel's octane rating. Your car doesn't know the octane rating of the fuel in its tank. Instead, the engine controller calculates an inferred octane with closed-loop logic that continuously advances the ignition timing until it detects knock, which occurs when a portion of the fuel-air mixture ignites before the spark-plug-initiated flame front reaches it.
The further the computer can advance the timing without provoking knock, the higher the octane rating. During knock, the flame front travels through the combustion chamber up to 10 times quicker than the normal spark-initiated flame front. Left unchecked, these pressure waves can damage the head gasket, pistons, or cylinder head. But the occasional brief knock is a useful tool for checking that the engine is operating efficiently.
It's detected with one or more knock sensors bolted to the block to sense the oscillations created by the pressure waves with a typical frequency between 7 and 16 kilohertz. Stephen Russ, senior technical leader for gas engines at Ford, says this normal knock is usually detected and addressed within one or two combustion cycles and poses no threat to the engine.
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