Entä V2:n väätö? Kuulemma alakierroksilla parempi kuin rivi 4:ssa. Mistä löytyisi faktaa? Huipputehoahan rivi 4 kehittää tapauskohtaisesti ilmeisesti enemmän, mutta ero tuon tyyppisen moottorin eduksi ilmeisesti tulee vasta kovemmilla kierroksilla ja kovissa nopeuksissa? Eli kumpi on parempi ajaa ns. normaaliajoa (vaihtelevasti mutkateillä ja maanteillä, hitusen kaupungissa ja minimalistisesti ehkä jopa radalla)?
Noin, laitetaas nyt sitten Ducatin insinöörien suusta faktaa peliin (lähde:
Ducati.com):
24) Displacement being the same, which engine has the higher torque between a twin-cylinder and a four-cylinder?
Let's consider, by way of example, the values of a twin-cylinder Ducati 748R (maximum torque 75 Nm at 9000 RPM) and of a four-cylinder Suzuki 750R (84 Nm at 10500 RPM). In terms of maximum torque values, the multi-cylinder model is more powerful, while the RPM at which this torque is produced is lower in the twin-cylinder.
However, the maximum torque value alone is not sufficient to describe a motorcycle's character: in terms of rideability, and hence, of global motorcycle efficiency, it is the trend of the torque curve that makes a difference. This curve must be "substantial" and consistent: occasional peaks or ups and downs can be harmful. The RPM at which the maximum torque value is obtained is also important: this RPM figure must be low in order to obtain greater "pull" and prompt engine response. In general, in numerical terms, what undoubtedly increases, passing from a twin-cylinder to a multi-cylinder engine, is maximum power: displacement being the same, a multi-cylinder engine will certainly be more powerful.
On the other hand, the "pull", i.e. the engine response to opening the throttle, which many mistakenly believe is the maximum torque, will be higher in a twin-cylinder.
In this "battlefield", Ducati, despite the slightly lower maximum torque value of its motorcycles, fears no competition.
Lyhykäisesti sanottuna: twini on erinomainen ja perusteltu moottorityyppi moottoripyörään.
Mutkateille ja maantielle pyörä, joka vastaa satumaisen upealla tavalla kuljettajan pieniinkin liikkeisiin niin moottorin kuin rungon osalta, on erittäin, erittäin upea ajaa! Nämä hyvät puolet yhdistyvät useassa twinissä, myös muissa kuin Ducateissa.
Sitten erääseen mielenkiintoiseen Ducatin tehtaan kaneettiin:
26) Has Ducati ever had, or will there ever be a four-cylinder engine?
Ducati never manufactured standard four-cylinder engines. At the end of 1963, however, upon the request of the American importers Berliner, the Apollo prototype was built with a 4 cylinder engine. The engine, obtained by pairing two traditional Ducati 90° twin-cylinders, was designed by the engineer Taglioni and had 1257 cc displacement. Unfortunately, this model turned out to be too powerful and too heavy for the tyres available at the time, and its development was almost immediately discontinued. Only one intact Apollo motorcycle survives today, which, skilfully restored by Mr. Pedretti, is on display in the Ducati Museum.
Look for more information in the "Heritage" section and in the Tech Cafè photogallery.
Nobody knows what the future will bring...
elikkäs, Desmosedicin jälkeen voi tulla jotain kivaa katupeleihin
