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:
“It’s a very odd thing—
As odd as can be—
That whatever Miss T. eats
Turns into Miss T.;”
—Walter De La Mare (1873–1956)
“The sight of a planet through a telescope is worth all the course on astronomy; the shock of the electric spark in the elbow, outvalues all the theories; the taste of the nitrous oxide, the firing of an artificial volcano, are better than volumes of chemistry.”
—Ralph Waldo Emerson (1803–1882)
“The whole of natural theology ... resolves itself into one simple, though somewhat ambiguous proposition, That the cause or causes of order in the universe probably bear some remote analogy to human intelligence.”
—David Hume (1711–1776)