Odd and Even Firing Order
Firing order affects the balance, noise, vibration, smoothness, and sound of the engine.
Engines that are even-firing will sound more smooth and steady, while engines that are odd, or uneven firing will have a burble or a throaty, growling sound in the engine note, and, depending on the crankshaft design, will often have more vibrations due to the change of power delivery (with the exception of the Crossplane crankshaft, which has an uneven firing order, found in most V8s and in very few Inline 4s, such as the Yamaha YZF-R1, and due to the 90° crankshaft arrangement rather than the 180° flat-plane crank, it causes the engine to have less vibrations than a flat-plane crank and thus no additional balance shaft is necessary). Most racing engines such as those in Formula One often have an even firing order, mostly for quicker acceleration, less vibrations, and more efficient exhaust system designs. Most engines that utilize the Big-bang firing order system will often have an uneven firing order.
Examples of odd-firing engines are any crossplane V8 (such as the GM LS engine), Harley-Davidson Evolution engines, 2009-present Yamaha YZF-R1, BMW S85 V10, Viper V10, Mercedes-AMG V12s, Aston Martin 5.9L V12, Yamaha V-Max and VMAX, Buick 231 Odd-Fire V6, and Chevrolet straight-6 engines.
Examples of even-firing engines are most current production inline 4s (with the exception of the Yamaha R1), most current production V6s, all Ferrari production engines, Lotus Esprit V8, Porsche 918 Spyder, McLaren M838T engine, Toyota LR engine, and all Lamborghini production engines.
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Famous quotes containing the words odd, firing and/or order:
“Holofernes. He is too picked, too spruce, too affected, too odd as it were, too peregrinate as I may call it.
Sir Nathaniel. A most singular and choice epithet.”
—William Shakespeare (1564–1616)
“Slowly, and in spite of anything we Americans do or do not do, it looks a little as if you and some other good people are going to have to answer the old question of whether you want to keep your country unshackled by taking even more definite steps to do so—even firing shots—or, on the other hand, submitting to be shackled for the sake of not losing one American life.”
—Franklin D. Roosevelt (1882–1945)
“The theater, which is in no thing, but makes use of everything—gestures, sounds, words, screams, light, darkness—rediscovers itself at precisely the point where the mind requires a language to express its manifestations.... To break through language in order to touch life is to create or recreate the theatre.”
—Antonin Artaud (1896–1948)