I think I'm ok here, but just to make sure, my ducati (S2R1K 06) makes belt noise, most notable on decel as that's when the arrows are quietest. It sounds reminiscent of a supercharger belt. The M900 I worked on before doesn't make this sound, and I have attributed it to the higher tension on the DS belts.
What I'm wondering is, do others hear this?
Incidentally, I like it. I like the belt noise, and the clutch noise, and the sound of the exhaust (unsilenced) I just wanna make sure it's not a bad sound. But these sounds, this aural stimulation really is a part of the uniqueness of Ducatis.
would check the tension and bearings. have they always made that noise?
I have an 08 S2R1K and I hear the belts as well on deceleration. Mileage is at 2500. I assume it's normal as it seems a little too soon to worry about belt tension.
Keep an eye on those bearings, if they start to turn dark bronze or purple they are over heating and getting ready to fail.
I have seen these bearings fail in under 600 miles when belts were over tightened.
I've already replaced the horizontal idler as the bearings had frozen and eaten through 50% of the belt. I'm a bit paranoid since, but the tension is correct, or even on the loose side. I don't tend to disagree with Ducati about the specs they offer on the bikes they build, but the DS belt tension is obscene. And the new idler bearings are smaller, which means they spin faster, and generate more heat. And the new bearings aren't removeable. The unkt is one piece now and 70ot bones... I hope I don't loose another one, because coupled with the replacement belt costs, that's sorta painful!
BTW, thanks Mike_D, nice to know I'm not the only one that hears it. With most sounds, I'm content drowning them out with exhaust noise, but the frequency of the sound quietly overwhelms the low frequency of the pipes.
Quote from: Smokescreen on March 08, 2009, 09:09:48 PM
I'm a bit paranoid since, but the tension is correct, or even on the loose side. I don't tend to disagree with Ducati about the specs they offer on the bikes they build, but the DS belt tension is obscene.
Who's been doing your belt/bearing work, and what method was used to tension the belts?
The tension was done by Pat Clark in Vegas, then i got the bike, and did a belt change, and tensioner change, as the bearings were frozen onto the tensioner. I used, per LT Snyder's books, the 45* method, and verified with a 3mm allen. I did, as noted previously, err a little loose.
i thought everybody worked on their own Ducati's? Isn't that why they are soo great to own? Because they are easy to work on?
3mm?
I thought "MY" LT Snyder book says 5mm.
Ducatisuite says 5&6mm.
Is the 1000ds motor belt tension really that tight/different?
Quote from: DarkStaR on March 08, 2009, 11:44:01 PM
3mm?
I thought "MY" LT Snyder book says 5mm.
Ducatisuite says 5&6mm.
Is the 1000ds motor belt tension really that tight/different?
Yes the DS motor
is that different.
Ducati has also changed belt specs to reduce bearing failures, I think from 13? Hz to 110 Hz. I have no idea hoe this converts to the allen key method.
Might be from 130Hz to 110Hz??? I don't know, and I lack the tools to utilize that method.
and yeah, the DS motor has a much higher tension specified. The LTSnyder book (the latest one) now covers the DS motor also, and takes note of this. The earlier version of the book didn't discuss DS mills.
An interesting aside, all the a/c motors seem to use the same belt tensioners, and the old tensioner with two attached bearings has been superseded by a one piece unit, with one wider bearing of a smaller diameter. No doubt this simplifies their inventory system, but it also means you no longer get to replace one wayward bearing at a time for $15. Now you replace the whole unit for $70ish...
Quote from: howie on March 09, 2009, 07:55:46 AM
Ducati has also changed belt specs to reduce bearing failures, I think from 13? Hz to 110 Hz. I have no idea hoe this converts to the allen key method.
The frequency method on a Ducati engine is a joke. They should go backward in technology to the fish scale deflection method IMO. I watched my mechanic try and hit 120 to 130Hz on my 1000ds, and the reading is sooo dependent on how you pluck the belt, it is like take 3 readings, and if you get 2 that are close use them as your current value. Then, when you loosen the tensioner, you start over from scratch.
mitt
I heard it on my S2R800 the first time just a few weeks ago (I had the bike 2 years now and put 14000 miles on it; guess I'm finally getting nervous about reliability and hearing things that I wouldn't have bothered me before lol). I whipped of the covers and discovered the belts where VERY loose, I could easley get a 10 mm Allen key to go between belt and tension roller, I adjusted the belts to spec -i.e. 5 mm key slips through Easley and the belts made exactly the same amount of noise? I understand its better to have em slightly loose rather than to tight.
a good way to note if the idlers are going is seeing the writing stamped on the back of the belt. If the red lettering is gone, you need to look closely to see if there is wear on the backside (the side with writing) of the belt. If there is wear, it can only be from an idler freezing. In which case, you need to change the idler and the belt immediately.
I thought I posted this here, but i guess not.
(http://i562.photobucket.com/albums/ss64/rokkshocka/photo.jpg)
Here's a pic of the new style tensioner (bottom) and the old idler (top)... as you can see, the idler took a lot of heat when the old tensioner blew. Note the blue discoloration. I'll try to get my vertical cover off and get a pic of the old style tensioner soon.
If your bearings are looking anything like the top bearing get them out of there as they have been overheated. when the bearings see this much heat they loose all lubrication and overheat and fail afterwards.