The Rotax twin is 60 degrees is it not? That would make it a... Y-Twin?
Ducati 799 Panigale
- Thread starter Geeser
- Start date
Ignition timing specs has a lot to do with how the engine sounds. Not all V-Twins sound a like. It's not just the configuation of the cylinders.
Some parallel twins are tuned to have a lumpy sound like a v twin. At least from an idle. Triumph's T Bird comes to mind.
Some parallel twins are tuned to have a lumpy sound like a v twin. At least from an idle. Triumph's T Bird comes to mind.
Configuration of the cylinders and the crank plays a large role in the sound. The Triumph Thunderbird imitates the sound and feel of a v-twin because it uses a 270° crank which mimics a 90° v-twin with a single-pin crankshaft.
Harleys have a unique sound because of the 45° v-twin. The firing interval is 315° and then 405°, much closer spaced than the traditional 270° - 450° intervals of the 90° twin found in Ducatis, Hondas, etc.
Another big-ticket item for exhaust note is header length. Unequal length headers will result in unequal sounding exhaust notes as gases from one cylinder take longer to escape than the other. Tuning the tubing length can vary the sounds drastically. You can make an inline 4 sound like a twin with the use of unequal length headers, but there is a price to be paid in performance. Companies like Harley (and Ferrari, and many others Im sure) spend obscene amounts of time and money getting the exhaust notes just right.
