2024 Aprilia RS 660 Trofeo w/ SC Project Exhaust Sound in action at Mugello & Imola!

[@madvente]

Gorgeous sound and HQ images! Thank you for the upload.

[@flyingphoenix113]

How odd. At high RPMs, you can hear the harmonic crossover of the 270 degree parallel twin. It goes from sounding like a 2-cylinder to an inline 3-cylinder!

[@identiticrisis]

Good ear! What's happening is the pulses are becoming closer together. Because one pipe is shorter than the other, instead of hearing 270° it moves closer to 240° - i e. like a triple (with a cylinder missing) And you're right that it's harmonics, even with the missing cylinder, there's enough in there so suggest a triple to your ear. Aprilia's 90° V Twins are the same. But Ducati did it first with the 999 and 749. I think it's by design. A triple is known to be the most efficient to drive an exhaust turbine due to the spacing of the pulses. This spacing is also about equal to typical valve timing durations - the length of time valves spend open. A triple is known for its torque without sacrificing top end. Some of that might be to do with the 240 interval / duration synergy giving more torque to spread around. Perhaps Ducati found a similar benefit at the time, although they moved back to equal length afterwards, with the bigger lower-revving 1098. Possibly to focus more on peak power. Ducati's current V4s in Superbike and MotoGP pair 290° twins, and the Superquadro engines swapped the long and short pipes around to similarly but oppositely increase the interval instead of reducing it. It's likely that engine speed and the required resonances / harmonics for tuning has a lot to do with that.

[@willemsebrechts4301]

Wow indeed! Thanks for the in depth explanation, it makes sense I guess hahaha. Not sure what I think of the sound yet, maybe something I have to get used to a bit

[@YUGEBBQ]

​@@identiticrisis can you describe what the "pulses" are please?

[@identiticrisis]

@@YUGEBBQ they are pressure pulses created when the exhaust valve opens. The combusted gases are still at a high pressure after expansion in the cylinder, having forced the piston down. After the initial pressure pulse comes "blowdown" where the majority of gas is expelled from the cylinder - this is the flow that people typically associate with performance and which is affected by the acoustic conditions in the exhaust. After that the piston returns to top dead centre again and pumps the remaining gases out. At this point scavenging becomes important, in order to completely empty the cylinder of burned gases, and is also mostly acoustically controlled - especially for two strokes. The pulses feed the acoustic resonances with their own harmonics, and these are then further filtered and amplified by the structure of the exhaust system.

[@hisride]

@@identiticrisiswhat do you mean it moves closer to 240? I get that exhaust dynamics changes harmonics, but it will never delay or move a power pulse of one cylinder (out the exhaust) so that they interact at a different degree than they left the chamber at.

[@the_mcmartin]

Sounds bloody good for a 600 class.❤‍🔥

[@AjackLee4]

Love the sound of a proper twin ❤

[@JamoZNL]

A parallel twin is not a proper twin :')

[@Poulusma]

​@@JamoZNLexactly, a Shiver is a proper twin 😈

[@NormanHughesdix]

270 degree crank

[@vsmaster6162]

Your audio quality is probably the best. I need more of this

[@StelaPop]

awesome footage, and great to see so many Aprilia riders out testing the bike! 😮

[@M-uq2jr]

Awesome video! And what gorgeous bikes. 👍

[@anitaliangamer]

i was there both Mugello and Imola. It was an experience!!

[@Tofazfou]

ABSOLUTELY LOVE EVERYTHING ABOUT THIS VIDEO BOZZY!!!

[@16egamaulanasaputra7]

Love your Video buddy keep it up!!

[@aleokyn5757]

Aprilia should up the game like build new rs860

[@Romulus_xxii]

Grande Bozzy! Bravissimo!👏🏻👏🏻🍾🥂👊🏻

[@arle479]

Nice Video and Crazy Sound 😃👍

[@hamburger4622]

That’s a lot of power to squeeze out of a 600 💥

[@lightinadarkendworld]

Thanks for the upload Buzzy. This new rider style of placing the leg out while coming into a turn is has been played out. It all started back in the early 2000s ( Nicky Haden, Jason Pridmore ) when flat track riders adopted to road racing -vice versa - Road racer adopting supercross for training. With the major being the natural reaction of the human body when going faster than the minds capabilities. This style is not capabilities but more a follow the leader style now. Leg always on the foot peg guys!

[@kenaiyuki]

Great !! thx

[@igioz]

awesome mid range bike

[@myaccount6905]

To be honest I prefer the sound of its big brother the V4…

[@pafsrh4744]

Fuk yeah

[@M-uq2jr]

Wonderful. But who cares? No need for that comment for this video.

[@Thee_Sinner]

They sound like someone straight-piped a moped…

[@22Epic]

If you can only afford a moped, it's fine mate.

[@leonardochristian5508]

Se vier pro Brasil eu compro

[@williammarley4195]

🔥🔥🔥

[@howtomake8340]

on 13 October we will test in Vallelunga a Yamaha R7 for CIV Sportbike, If you want you are welcome!

[@spookydog6959]

go hard boys

[@The28Cj]

🔝🔝

[@joe125ful]

Wow looks much faster then 105Hp! Paraller Twin?Whats that...why not use single cyl?

[@MarkMeadows90]

Those twin cylinder engines remind me of a high revving single cylinder. Don't hate me, just what it reminds me of lol

[@daytonasayswhat9333]

Is this a demo, or a spec race?

[@riccardosimeoni1751]

Why didn't you make a video about RallyLegend 2024?

[@tropheedubearn]

Hello 19bozzy Have you been able to spot the next v6 LMP3 engine?

[@Zmaj85]

What about engine durability? I've heard that there was a lot of engine failures, 2k, 3k km...

[@igioz]

you heard bad really bad great reliability

[@jamesgozzo7860]

anyone know the exact model of the SC in this video?

[@malcolm2527]

Sc1 Race Version

[@MuhamadFaryantoo]

make more motorcyle video please...

[@leslienagy7949]

similar to a yamaha sound

[@igioz]

yes, same displacement and crankshaft degree

[@roll411]

Show Bugatti Veyron (race car)...🥱🛌

[@NudaMan]

I hated on this bike for so long because I use to work with them day to day at a dealership (horror!) but after a few years of being out and being top dog of its class I’d take this over the R7 any day

[@stfu6397]

R7 is a trash bike, trash brakes, underpowered and last but not least... overrated

[@tomwebb7091]

Hmmmm, yes. Just cause something sounds loud it doesnt mean it sounds good! Harmonically confused in this case even with flatulent overtones 😂

[@markblackman2542]

They sound ....Crap .sorry, to me a race bike should scream and not have electronics more than a space shuttle

[@PlanB-i3i]

Some day, we all will be old❤ njoy the time you live in.

[@fr4gl3]

tbh, if it's not 4inline I mute the sound.

[@jesp9435]

Tbh, we don’t care

[@schenebod]

who likes to have a boring screaming bitch? Weirdooo

[@fr4gl3]

@@jesp9435 enough to comment

[@myaccount6905]

Listening to the sound of the big brother V4 might make you rethink ☺️

[@treeabroad]

Well but all bikes are awesome in my opinion, I enjoy all :)

[@adrianoiglesias7619]

😮

[@relampago1000mw]

si me dan la oportunidad me suba a su moto y luego hablamos! LES BAJO EL TIEMPO A TODOS LOS QUE ESTUVIERON GIRANDO!

[@GoogelKoyak]

I'd say, my 185cc SYM VF3i sounds better redlining on the highway with factory pipes....🤣🤣 Come on you guys, check out VF3i's videos and enjoy....