Talk:Engine balance
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I disagree with the definitions of "primary" and "secondary" balancing. My understanding is that "primary" refers to a vibration at a frequency equal to the speed of the engine. For example, a single cylinder engine would have a primary imbalance. "Secondary" refers to a vibration at a frequency equal to twice the engine speed. For example, the non-sinusoidal motion of the pistons in an inline-4 engine cause it to have a secondary imbalance. The idea of kinetic energy is useful in solving some problems but I don't think engine balancing is one of them. What we really care about are forces, not energies, and while the two are related, I think it makes more sense to talk about forces directly.
I would also suggest the following changes:
-introduce the concepts of static vs. dynamic balancing -mention firing frequency (and the general desire for it to be even for the engine) -discuss the difference between primary/secondary FORCES and MOMENTS -discuss the trade-off of crankshaft counterweights, particularly in engines with a small number of cylinders -delete the reference to carburetors, or at least change the wording. While some may refer to cross-cylinder fuel distribution as "balancing," it is wholly a different problem engine balancing in the common sense.
Unfortunately my library of engine books is currently at work, but I will retrieve them and work on completely reworking this article. In the mean time, anyone is free to implement any of these suggestions, or propose others.
- I agree with this person who disagreed. Obviously some backwards thoughts written (yet again, in my pursuits at wikipedia- the coincidences are starting to bother me). Example from article: The undesired motion of a boxer four does not have an undesired motion. Primary balance correct has no secondary problems. A boxer four with 3 main bearings for example makes no use of harmonic balancers, like any counterbalanced engine would, unless the pistons themselves are doing the balancing for each other, they will be babbling about secondary.. The secondary comes from bad primary, allowing eengineers to "tinker" with this as secondary should be an international automotive standard crime. But the article has to stay friendly... just get the facts straight. Good luck to the above anonymous discusser and getting the job done.Even the definition has a terrible excuse for bad engineering. Unlike the boxer four, the only balanced engine on planet earth , and the universe as we know it.Writing defintions without facts is like an inline fours primary balance... and the straight 6, the 60 degree 6, the 5 main bearing boxer, the goofy shared rod pin of the last half century's v8, and on and on and on...anything but the 3 main bearing boxer.. Aside from my losing cool here, the article stinks, seriously.
- ~soob792~ 02:49, 9 February 2007 (UTC)
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- Well, don't just bitch us out, be bold and make it better! (But a hint: you may want to learn more about how Wikipedia uses punctuation, formatting, and markup first.)
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- Atlant 13:31, 9 February 2007 (UTC)
