Come on experts, pipe in! Time to get my learn on.

 

I can 100% tell you straight cut gears are stronger then helical cut gears. Helical gears make less of a contact with each other then straight.

 

Is that the air being sucked into the intakes your talking about?

 

I answered my own question by looking at the part catalog on IndyOEM. Here is a 2003 600RR transmission: straight cut gears, these would definitely whine...like the reverse gear in a car.

 

hmmm I always assumed it was because of the higher rpms...:retard:

 

Yes, the noise you hear is from the straight cut gears in your transmission. Some race cars are far more exaggerated as seen in this video.

. Ram air has a sucking noise and not much of a whining noise. They are easy to tell apart. My old cbr 600 f2 you could hear the air sucking in the ducts and it almost sounded turbo charged. Often reverse gears in street cars are all straight car gears, which is why it makes that whining sound. formula f1 cars also use straight cut gears as well. straight cut gears are more efficient while applying more directional and forward applications of force. They are able to withstand more force given without much loss of power as opposed to helical cut gearing.

 

For the record it sounds like that videos noise is being cause by the rear diff gears and not the transmission at least it didn't seem to change in pitch with rpm or gear selection just with speed increase


Sent from my Motorcycle iPhone app

 

This is a better example.

 

It's probably just unfiltered harmonics that are being picked up by the microphone. I bet if you were actually driving you would not hear that extreme high pitch noise that's recorded in the video

 

Both cars are using straight cut gears. It's no kidding how loud the transmission can be (louder than the engine) on different race cars. I saw a video of a Porsche in which the only noise you could hear was the transmission noise inside the car.

 

There we have it, isn't learning new things cool?

 

So what the hell causes the whistle on a Triple?

Now that....is a F#!$^*& gorgeous sound!!!!!!

 

I was curious about the Triple 675 whine too, I did research on that back in August after hearing one, and the owner claimed "That's just the sound these engines make because it's a 3 cylinder" Well my Geo Metro was a 3 cylinder too, and it didn't make that high pitched whine. It took a lot of sifting through Triumph message boards to find the answer. Those guys are so full of themselves at times, they hate on every 4 cylinder sport bike.

It's caused by the timing drive gears to my understanding.