Why do v-twins sound like that ?

[oldjack]

After all there's 2 cylinders firing alternately at equal intervals, the same as a BMW boxer or lots of vertical twins, but they don't have that characteristic fruity 'proper motorbike' sound. Is it more to do with the different length exhaust pipes on a v-twin ?

[kwak zzr]

characteristic fruity 'proper motorbike' sound

its the pulses of the v twin that make the sound.

[Sholay]

V twins don't fire at equal intervals. If it was equal intervals it would be one fire for every 360 degrees of rotastion of the crankshaft. With a 90 degree v-twin it fires at 270 and 450 degrees.

Hope I'm right on the degrees, but fairly sure that is it - please correct me if wrong.

Don't know if that explains the sound difference or not!

[Biker Biggles]

It's written in the Bible."And the roar of Moses Triumph could be heard throughout the land".But Moses was a Mediterranean type so he went and bought a Ducati. :wink:

[dotted]

On Vtwins you have 2 fast big explosions followed by a long pause !


like Bum-Bummm-pause-pause-pause-Bum-Bumm-pause-pause.... :?

Harlers sound even better (to me...) because its something like a 60º twin , so the cylinder explosions are faster and the pause even bigger :)



V twins don't fire at equal intervals. If it was equal intervals it would be one fire for every 360 degrees of rotastion of the crankshaft. With a 90 degree v-twin it fires at 270 and 450 degrees.

Isnt it 270 and 360 ? 270+90 = 360 :?

[chazzyb]

Harlers sound even better (to me...) because its something like a 60º twin , so the cylinder explosions are faster and the pause even bigger :)


45º for a Harley. Dullville is 60º. Anorak for me. :oops:

[zedleppelin1981]

I've got a link that explains why a Harley twin sounds different to other twins, both in words and animation. Though its a mht format :?: so dont know if I can post it (I'm not a computer techy person)

Can send it by email though (thats how I got it) if anyone is interested

[embee]

Harlers sound even better (to me...) because its something like a 60º twin , so the cylinder explosions are faster and the pause even bigger :)


45º for a Harley. Dullville is 60º. Anorak for me. :oops:

Dullsville - 52deg
Firing intervals - Front - 232 - Rear - 488 - Front
It has a split/staggered crankpin with a centre flying web


Afraid my anorak's bigger than yours :wink:

[Beenz]

Regardless of engine configuration, even power stroke twins will sound similar, they may vibe differently and be wider compared to a V though. Offset crank pins allow a narrower angle V. A 90 degree V is well balanced using the same crank pin position allegedly.

[chazzyb]

Harlers sound even better (to me...) because its something like a 60º twin , so the cylinder explosions are faster and the pause even bigger :)


45º for a Harley. Dullville is 60º. Anorak for me. :oops:

Dullsville - 52deg
Firing intervals - Front - 232 - Rear - 488 - Front
It has a split/staggered crankpin with a centre flying web


Afraid my anorak's bigger than yours :wink:

I bow before the master! :oops:

[wheelnut]

Potato Potato :P

[oldjack]

I think I'm beginning to understand. The firing interval ISN'T equally spaced.

Wheelnut's potato potato sums it up very simply and effectively :idea:

I can't understand how lentils would have any effect though kwak :?

[TSM]

I think I'm beginning to understand. The firing interval ISN'T equally spaced.

Wheelnut's potato potato sums it up very simply and effectively :idea:

I can't understand how lentils would have any effect though kwak :?

That potato potato sound is also very much to do with the way Harleys have the valve sizes and timing.

So basicly, firing order, firing 60/90/180 etc, valve sizes, valve timings, exhaust pipe size all contribute to the sound an engine made.

Harley & Ducati tryed to patent their unique sound of the engines they produce, it did not pass.

[socommk23]

cos they are double ard!!! a proper mans bike!

il4s are girls bikes!

and triples... well they are just confused!

lol

[Alpinestarhero]

It's written in the Bible."And the roar of Moses Triumph could be heard throughout the land".But Moses was a Mediterranean type so he went and bought a Ducati. :wink:

I wonder if he'll be trading in his old 750ss (they've been around since biblical times) for a shiny new 1098...

Matt