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Firing order
Tom Del Rosso wrote:
> This always bugged me. Why is firing order always non-consecutive? > > It's simple. it's not possible to balance the crankshaft in most engines to do that and still have an engine that fit's into a vehicle. Take a simple 4 cylinder. The crank throws have to be 90 degrees off from each other to maintain balance. Then you need to balance out the rocking coupled frequency from the firing order. If you don't the vibration will quickly destroy the engine. On a V engine you have 2 cylinders on each crank throw. So you have cylinders 1&2, 3&4, 5&6 each sharing a throw. Number one is at TDC but number two is already past TDC and heading down the bore by the time number one fires. Impossible to have them fire in sequence. There are some engines out there that have a sequential firing order, but the crankshafts have split journals and generally they are not capable of much power output because of the crank design. -- Steve W. |
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#12
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Firing order
On Saturday, January 6, 2018 at 12:10:45 PM UTC-6, Steve W. wrote:
> Tom Del Rosso wrote: > > This always bugged me. Why is firing order always non-consecutive? > > > > > > It's simple. it's not possible to balance the crankshaft in most engines > to do that and still have an engine that fit's into a vehicle. Take a > simple 4 cylinder. The crank throws have to be 90 degrees off from each > other to maintain balance. Then you need to balance out the rocking > coupled frequency from the firing order. If you don't the vibration will > quickly destroy the engine. > > On a V engine you have 2 cylinders on each crank throw. So you have > cylinders 1&2, 3&4, 5&6 each sharing a throw. Number one is at TDC but > number two is already past TDC and heading down the bore by the time > number one fires. Impossible to have them fire in sequence. > > There are some engines out there that have a sequential firing order, > but the crankshafts have split journals and generally they are not > capable of much power output because of the crank design. > > > -- > Steve W. One cylinder up to 16, 24 or more, engines fire on only one cylinder at a time. Most of them anyway. Batteries do not have electricity in them either |
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