Talk:Crankshaft

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I've removed : "In the Wankel engine, the crankshaft and the chamber in which it rotates is shaped to provide a compression and expansion area allowing the forces caused by detonation of the fuel to act directly on the crankshaft."

I thinks it's unaccurate IMO there is no crankshaft in a Wankel. But I can be wrong this could a problem of slight difference in technical terms between French and English. But even if there's something taht can be called a crankshaft, I don't think the detonation can act directly on it. Ericd 18:03 Apr 12, 2003 (UTC)

"diametrically opposed five (five pistons with three set diagonally opposed to two)." This is joke ! Try to divide 5 pistons in 3 sets ? Ericd 22:10 Apr 12, 2003 (UTC)

To Ericd: The word "set" is meant as "placed" or "aligned" rather than as "a group." There are three cylinders placed opposite of the other two. Get it? Also, the crankshaft in a Wankel motor does, indeed, have the compression chamber incorporated into it. As the crankshaft rotates, the chamber comes around and lines up with it's other half in the block. I think you are splitting straws over the name of the part. The crankshaft in a motor drives the transmission which then drives the drive shaft. Whether or not there are pistons driving offset points on a shaft or a shaft is spinning around from diagonal forces placed directly upon it via explosions, it is still cranking around. [Alan Evil]

I don't thing that 5-cylinder have a flat crankshaft the most rational solution is to use a 72° angle. The engine will have good balance but even firing. However I have somewhat changed my mind about this. I was believing that all 3-cylinder had a 120° crankpin angle until I discovered that some version of the Laverda Straight-3 mortocycle have a flat crankshaft (120° crankpin angle). Thus I believe now that some constructor may have designed flat-plane straight-5. As of today with CAD, counterweigth and balance shafts an engineer can design a very imbalanced engine that don't explode. However in the absence of source I don't know how a straight-5 crankshaft is designed.

BTW the crankshaft in a Wankel is not a crankshaft but an eccentric shaft it does not have the compression chamber incorporated into it the compression chamber is the "rotating piston" (the rotor) Ericd 22:12, 23 August 2005 (UTC)

The original reason I visited this page is to find out what "crankshaft" is in sexual terms. I believe it has something to do with scatalogical (sp?) sex acts but I'd rather not visit the sites which pop up when the term is Googled. Gotta admit it creates some weird images. [Alan Evil]

[edit] Crankshaft throw

The article refers to the "crank throw" as synonymous with the "crank pin". Surely this is inaccurate. Strictly speaking the throw is a measurement (sometimes taken to be the distance from centre of crankshaft to centre of crank pin, sometimes twice that distance) and not an object. If it can be an object then surely it would be the crank arm, i.e. that part of the crankshaft that is at right-angles to the shaft axis and provides the crank-pin offset?

[edit] crankshaft runout

Please add something about crankshaft runout. According to www.thewarfields.com/HotRodBlogEngineAssy4.htm it has to do with the straightness of the crank, but I was hoping for more info than that. Thanks