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  1. #1
    Active Member Bruiser37's Avatar
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    Default RT Spyder engine noise measurement

    Major loud engine noise 2018 RT Limited Spyder Roadster comes from engine top end, cylinder heads, mechanical valve train operation including drive mechanisms, transmission system gearing and drive mechanism coupling to rear drive wheel.

    Noise sound level measurements made at approximately two and a half to three feet from rider ear level to large instrument panel speaker grill work with open venting to engine compartment.

    There appears to be serious acoustic coupling to major engine noise source and possibly some amplification due to “speaker effect” of large instrument/speaker panel area. More sophisticated sound measuring instrumentation would be required to prove this observation.

    Large top outer panel right & left side engine compartment vents with wind deflectors facing rider also contribute to major engine/drive components sound level source.

    Average range of human hearing between 400 and 8,000 Hz. Sound level measurements made with calibrated dB (A) scale instrument.

    At speeds between 50-75 MPH in 6th gear sound levels range from 90 to 105 dB (A) with 110 dB (A) peaks. Higher frequency sound levels could also be a damaging factor but not measured. Normal lower gear operation and shifting noise levels could be even higher but this was not completely explored in this case.

    Without good quality helmet including OSHA approved safety rated earplugs or equivalent hearing protection long-term exposure to sound levels of this magnitude will cause permanent damage to rider hearing.

    Consideration for safety and rider comfort of future touring FT & RT Spyder model years.

    Engineered acoustic sound isolation between engine compartment and rider instrument panel interface including sound absorbing material of at least ¼ inch thick applied to all inside surfaces of outer body panels surrounding engine compartment including lower rider outer body side panels.

  2. #2
    Active Member spyder01's Avatar
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    Default

    I have started to experiment with dynamat under body panels and will report back if any improvement can be had.Agree that Spyders are too noisy but can be tolerated when using helmet.
    2017 RTL ORBITAL BLUE

  3. #3
    Very Active Member Chupaca's Avatar
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    Default Interesting....🤔

    Wonder what the Harley crowd with the straight pipes do to keep from going deaf.... The triple has been said to be noisey and though most work on hydraulics they do sound like there are loose marbles in there others say sound like sewing machine or have gravel in the tranny....
    Gene and Ilana De Laney
    Mt. Helix, California

    ​2012 RS sm5

  4. #4
    Very Active Member PMK's Avatar
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    Default

    A short while back, while working on our Spyder, I found the foam sound deadening material had failed.

    At my disposal, I had sheets of aircraft sound proofing mat. The soundproofing mat is self adhesive, proper density foam, with an external backing of silicone sheet rubber. Total thickness is probably 5/16".

    The soundproofing mat replaced the oem soundproofing on the acoustic panels that failed. The temps on the exterior panels decreased, and yes, I do believe the engine noise is quieter. If the soundproofing mat has endured, I plan to replace all the oem soundproofing material during the next major body panel removal.

  5. #5
    Active Member Bruiser37's Avatar
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    Default

    Quote Originally Posted by spyder01 View Post
    I have started to experiment with dynamat under body panels and will report back if any improvement can be had.Agree that Spyders are too noisy but can be tolerated when using helmet.
    Very interesting I had thought about that and often wonder why there is only a small patch of thin insulation on lower body panel. Don't know why a third party Spyder merchant hasn't hasn't experimented and come up with a pre cut kit of sound absorbing material for outside body panels. Thanks for post and look forward to your findings on possible future RT improvements. Please feel free to contact me through Spyderlovera forum email system. I live in Tucson, AZ

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