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SVTPerformance's Chain of Restaurants
Road Side Pub
Can anyone explain engine firing order and how it impacts the engine sound?
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<blockquote data-quote="James Snover" data-source="post: 9672108" data-attributes="member: 67454"><p>The Viper does not have a 72-degree block? If it is a 90-degree block, then no, it cannot be even-firing. A v-10 (dumb), in a 90-degree block (dumb for a v-10) and odd-firing (dumb but unavoidable if it is a 90-degree block) = dumb engine.</p><p></p><p>OP: the entire engine design is driven by the firing order. Change the firing order, change the various components to suit the new firing order and it sounds different. Because it is now a different engine. </p><p></p><p>A firing order is necessary to make power efficiently and increase the engine's longevity. There are many possible firing orders for any engine, but only a few are used as most of the others are inefficient, or make less power, or tear the engine up. The Chevy small block for instance, usually came with a 90-degree dual plane crank. But it makes significantly more power with a 180-degree single-plane crank. The single plane won't last as long, however, due to stresses on the crankshaft. The primary benefit of the single plane crank is that the intake and exhaust design can now have evenly-spaced pulses that reinforce each other to the best possible extent. But the 90-degree is what you saw on the street because it made good power and lasted much longer.</p><p></p><p>The best firing order is with a 60-degree block V-12 with a 120-degree crank. Silky smooth, beautiful sound and they last forever. All the V-12 fighter planes of WWII were in this configuration _except_ the Rolls Royce Griffon which, for some reason, had an odd-firing crank.</p><p></p><p>A good example of an odd-firing engine which was mass-produce and had great longevity is the Chevy V6 from the '80's and '90's. It was a 90degree block with an odd-firing crank. As much as I hate odd-firing configurations, those old lumps of iron lasted forever.</p><p></p><p>Jim Snover</p><p></p><p>EDIT: and vibration! A firing order can be determined to control or mitigate vibration. How could I forget?</p></blockquote><p></p>
[QUOTE="James Snover, post: 9672108, member: 67454"] The Viper does not have a 72-degree block? If it is a 90-degree block, then no, it cannot be even-firing. A v-10 (dumb), in a 90-degree block (dumb for a v-10) and odd-firing (dumb but unavoidable if it is a 90-degree block) = dumb engine. OP: the entire engine design is driven by the firing order. Change the firing order, change the various components to suit the new firing order and it sounds different. Because it is now a different engine. A firing order is necessary to make power efficiently and increase the engine's longevity. There are many possible firing orders for any engine, but only a few are used as most of the others are inefficient, or make less power, or tear the engine up. The Chevy small block for instance, usually came with a 90-degree dual plane crank. But it makes significantly more power with a 180-degree single-plane crank. The single plane won't last as long, however, due to stresses on the crankshaft. The primary benefit of the single plane crank is that the intake and exhaust design can now have evenly-spaced pulses that reinforce each other to the best possible extent. But the 90-degree is what you saw on the street because it made good power and lasted much longer. The best firing order is with a 60-degree block V-12 with a 120-degree crank. Silky smooth, beautiful sound and they last forever. All the V-12 fighter planes of WWII were in this configuration _except_ the Rolls Royce Griffon which, for some reason, had an odd-firing crank. A good example of an odd-firing engine which was mass-produce and had great longevity is the Chevy V6 from the '80's and '90's. It was a 90degree block with an odd-firing crank. As much as I hate odd-firing configurations, those old lumps of iron lasted forever. Jim Snover EDIT: and vibration! A firing order can be determined to control or mitigate vibration. How could I forget? [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Can anyone explain engine firing order and how it impacts the engine sound?
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