I thank you Kindly IdahoMtnSpyder
Quote:
Originally Posted by
IdahoMtnSpyder
You know what, Wild? This is the first post you've made that I can find where you so clearly have explained your vibration problem! There are two other posts describing the same issue.
http://www.spyderlovers.com/forums/s...=1#post1145832 and the one immediately following.
It reads like something is going on that hasn't been described very well before, if at all. After reading your comment, and the other two, I think there may be something more than a strictly belt speed related vibration. Maybe the BRP engineers have figured it out but aren't fessing up. Apparently it all is related to the belt length. The RT has the same engine and shorter belt but I don't recall anyone reporting a clear RPM related vibration with the RT such as you and the others have for the F3. Maybe the engine mounting system in the F3 allows the engine vibration to cause the belt to vibrate regardless whether it is moving or not. Depending on tension, the belt tensioner will reduce the vibration different amounts. That is probably why some owners report pretty much complete vibration reduction with the tensioner and you haven't. I'm guessing no one has documented what the sweet spot of belt tension and tensioner pressure is that works. Maybe BRP engineers have, and they're not ready to disclose it yet. Those numbers may be part of the package with the new tensioner they're coming out with.
Maybe the engine mounting itself has a harmonic vibration point at the 3 to 4k rpm range. But I doubt it or more owners would report the problem.
I know this is a lot maybes, and may be largely speculative, but it's all I have for now.
Thank You Kindly IdahoMtnSpyder,
Somethings are difficult to put into words that everyone understands. What I am Really saying is BRP has come up with a solution to dampen the existing engine vibrations. For us existing Spyder owners really nothing inexpensive will solve the real problem. If BRP put quality control into mfg & purchased pistons, rods, motor mounts, harmonic balancer, etc, that have a tighter weight spec equality--we would see no problem. This of course is for future engine builds on future model Spyders..
Example--if you have any devise in your home--fans,humidifier, etc that make a buzzing sound --place your hand on the device & notice how your hand dissipates--reduces the vibration noise. That is exactly what the belt tensioners are doing--giving another path to reduce the vibration. Some lucky individuals may have engines that were assembled with matching balanced parts or close to matching parts thus they have less harmonic vibrations & the tension roller will do magic to remove their vibration. Some of us weren't so lucky during engine mnfg.
Now I fully realize that BRP will not recall unbalanced engines--thus for $$$ sake they need to appease the current owners with the least expensive modification--aka--belt tensioner. What surprises me is that I know the difference between the sound of an engine high pitch vibration and a low pitch belt vibration---they are not the same---just possibly a few others don't.
It's time for me to step out of this vibration conversation--I feel I have upset a few people & that was not my intention. My true intention was to make BRP realize that we know the source of the problem & the source is within their engine mfg quality control specs and for BRP to rectify this problem on future Spyder engine builds.
Thank everyone for listening to my complaint--I'm sure some will understand & some won't--now isn't that "just life on life's terms"
Darrell