The 24K service on my V100 is nearly due. Was wondering about the tensioning frequency specified for the alternator belt(180Hz). I already have the belt, so I was able to measure it. The belt weighs 0.045Kg, total length is 0.499m. Didn't measure the actual distance between alternator pully centers, but 0.12m seems a reasonable approximation. Given those figures, and the formula T = (2Lf)^2 * m, 180Hz frequency suggests a tension in excess of 150N. Does that make sense to anyone?
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V100 alternator belt tension spec
- Thread starternoamlunz
- Start date
If anything like the CARC bikes, that belt only has to turn the alternator without slipping or being too tight. The specification for the CARCs was elusive in the documentation. The consensus was to tighten so you could get a 90 degree twist mid way on the belt. I doubt few if any shops have the equipment to measure frequency.
Shops measure the tone of Ducati belts all the time. There is an app for the smartfone. I have not seen this done on any Guzzi and find it as not needed but kinda cool you can do it that way. If you can find the info have at it, it's your bike.
That's something to ask the dealer in your area. Piaggio techs help the dealer techs solve issues. They have a representative for service issues that come about at a dealer. You could also record the frequency of a new bike and call it good.
Well, Piaggio referred me to my local dealer. Service professinalism in my area isnt amazing. They didn't even know what I was talking about.
I've used the Panotuner app regularly on my 4V Ducs. Its free and easy. Just kill any fluorescent lights when using the app since they provide a lot of noise.
I believe that is for cam belts, not alternator. Is the alternator belt tension all that critical?
Well, the service manual bother specifying , alongside a picture of a guy measuring it with a fancy 300$ device...
And in any case tension matters , since I guess it will start slipping below some tension...(By the way , on my bike it has reasonant frequency at around 2200 rpm where it squeeks from day 1)
And in any case tension matters , since I guess it will start slipping below some tension...(By the way , on my bike it has reasonant frequency at around 2200 rpm where it squeeks from day 1)
Jon_The_Bike_Man
Just got it firing!
I did mine at 15k Started at the same point it came off with, set my phone in the area with a hz reader and plucked at it like a guitar string. Slowly adjusting and got it to 179hz. Shop tested and voltage for charge was spot on. Now on 30k and battery going strong.
Thanks, Your answer was really the most helpful. Have a few questions:
1.What app did you use? Gate Carbon Drive?
2. Did you get a chance to measure the free span of the belt?(Distance between pulley centers). With that information I can convert the frequency into tension force and complement with force tension measurement by crickit gage or another similar device.
Thanks again
Jon_The_Bike_Man
Just got it firing!
The android app i used was spectroid. It captures data in a graph and you can see the highest frequency out of your recorded series. Such as 5 plucks in 10 sec.