Encyclopedia > V-twin

  Article Content


Honda 90 V-twin

A V-twin is a two cylinder internal combustion engine where the cylinders are arranged in a V configuration.

This arrangement is common on motorcycles, the engine can be mounted in transversal position like on Harley-Davidsons, Ducatis and many recent Japanese motorcycles. The longitudinal V-twin as seen on Moto-Guzzis[?] and some Hondas is less common. This position is well adapted to its transmission shafting, but has the disadvantage of causing a torque reaction that tend to lean the motorcycle on the side.

The most obvious configuration for a V-twin is a 90 angle, but others angle can be seen like the 45 Harley-Davidson, the 75 Suzuki and the 60 Aprilia.

The 90 V-twin

A 90 V-twin can achieve perfect primary balance but has some secondary imbalance. The 90 V-twin should be viewed as an alternative to the flat-twin configuration. The flat-twin is perfectly balanced.

Harley-Davidson 45 V-twin

The 45 Harley-Davidson V-twin

The cylinders of the classic Harley-Davidson V-twin are arranged at a 45 angle. The crankshaft has a single pin, and both pistons are connected to this pin through their connecting rods. This design causes the pistons not to fire at even intervals.

The V-twin runs like this: The first piston fires. Then, the other piston fires at 315 degrees into the stroke. There is a 405-degree gap until ... the first piston fires again. This give the Harley-Davidson V-twin it's unique pop-pop...pop-pop...pop-pop sound.

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Springs, New York

... couples living together, 8.9% have a female householder with no husband present, and 34.9% are non-families. 26.1% of all households are made up of individuals and 9.6% ...

This page was created in 24.2 ms