Tässä vielä teemaan "Sporttiguzzi radalle" tekstiä eri aikakauden vaihdelaatikoista (by P.Roper), mielenkiintoista...
"
There are reasons why the clutch and driveline were changed by the factory, initially with the Spineframes and then with the CARC series.
The old five speed was a good, but agricultural, gearbox. By the 1990's it was way past its use by date. It was too long, too heavy and shifted with all the panache of a Fordson tractor. As far as the clutch is concerned, the designers knew they were pushing the friendship when they started asking it to take the 80+HP of the Todero's Hi-Cam 1). It was at that point they bumped the number of springs up by two and that went through, along with a litany of busted plate centres that may or may not be related, until the demise of the 2V engine.
The *Old* six speed 2) was a wonderful thing, if it was assembled and finished well. Otherwise it could be a dog. It was also expensive with its four shafts and cam-plate selector system.
The *New* 3) six speed is a three shaft box and in terms of length a bit of a compromise but I think it's lighter than the *Old* one and is consistently reliable and a great shifter. The 8V was always going to need a beefier clutch. 110-115 HP at the crank will brutalise any twin plate, unless you increase the clamping force and if you did that you'd need a left hand forearm that would make you look like a bloody Fiddler crab. While the early 8V single platers may need a bit of a Herculean pull they at least lasted. The new Cali 14 design is even moderately light.
Another thing about the six speed gearboxes are they are straight cut. That means no end thrust on the cases. The five speeds (almost all of them), are helically cut and impose significant end thrust on the shafts and therefore the cases. A five speed was designed for 50HP basically and similar, in contemporary standards, weedy torque. The end case is held on by ten or so 6mm bolts.
The five speed and Tonti/Loop bevelboxes simply aren't strong enough for the modern motors. The only reason you'll see the modern motors being shoehorned into Tontis with the old running gear in them, is because of legislation outlawing modification of machines after a certain year in some markets.
"
Lat.huom:
1) Daytona, Centauro
2) V11, MGS-1
3) Carc -mallit, uudet V7 ja V9 mallit, Cali 1400 (?)
