Thruxton dB's.....how big is yours?

Discussion in 'Thruxton, Scrambler & Trident' started by dickydido, Mar 17, 2017.

  1. dickydido

    dickydido Senior Member

    Nov 3, 2016
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    #1 dickydido, Mar 17, 2017
    I was filing away the Bobbers V5 document last night and I noticed (for the very first time!) that it actually lists the bikes dB level.

    ....for the Bobber it's 97 dB @ 3,050 rpm

    ....so out of interest I checked out what the Thruxton 12's was, it was 93dB @ 3,375 rpm

    ....I am assuming that the testing for all DVLA data is carried out at the same distance from the sound meter so these figures are directly comparable which means, with the dB scale being logarithmic and not linear, that the Bobber is much louder than the Thruxton.........and my 'seat of the pants' testing agrees with that....it does sound much more 'boistrious' than the Thruxton.

    Out of interest, please will owners of other Triumph models share how many dB's their bikes are originally listed as producing in Factory Spec......... ( this means pre V & H, Predator etc etc mods)

    Now I know lots of us on the Forum love and favour that 'fruitier' exhaust note........I do suspect that the louder the exhaust the more we believe it enhances our 'gentleman bits'........So I was wondering if dB actually stands for di*kBooster!!!......lol........

    Cheers,

    di*kydido
     
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  2. crispey

    crispey crispey creme de la creme

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    #2 crispey, Mar 17, 2017
    my thruxton says stationary 91db and 97db drive by at 3500 revs ,the tiger is 92 and 80 at 4650 revs so actually queiter. I'd like to know what the thrux gives with the preds on. Anyone got an HD, it would be interesting to see what those specs are.
     
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  3. Dougie D

    Dougie D Crème de la Crème

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    #3 Dougie D, Mar 17, 2017
    it would be interesting to know how loud my Hog is:eek: are you able to buy a cheap meter to find out?
     
  4. dickydido

    dickydido Senior Member

    Nov 3, 2016
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    #4 dickydido, Mar 17, 2017
    Hi Dougie D,

    .....cheapest decibel meter on EBay.....£11.49........but it only goes up to 130dB's.......not sure if that'll be enough for your Hog!....

    Cheers,

    dickydido
     
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  5. Dougie D

    Dougie D Crème de la Crème

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    #5 Dougie D, Mar 17, 2017
    Tried googling db of straight through Vance & Hines on a harley, but could only see a figure with baffles in ..105 db ..did a bit more googling and it seems for every 10db its 10 times as loud..would that be right? I.E. 115db would be 10 times louder than 105db
    If that's the case does that mean for every 1db it is twice as loud :confused:
     
  6. dickydido

    dickydido Senior Member

    Nov 3, 2016
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    #6 dickydido, Mar 18, 2017
    For a better understanding of dB comparisons go check out this site, the jump in sound intensity is very startling for just a few dB's more.

    But Dougie, I hope your Hog ain't pushing out more than 150dB as your head will explode!...

    .....always make me chuckle when I hear on some of the You Tube videos...'with my new (pick your own preferred brand of after market exhaust) I can now hear them even when I am wearing my ear plugs.....lovely!''....

    https://www.chem.purdue.edu/chemsafety/Training/PPETrain/dblevels.htm

    Cheers,

    dickydido
     
  7. MickEng

    MickEng Noble Member

    Sep 29, 2016
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    #7 MickEng, Mar 18, 2017
    The physics surrounding decibels needs studying to even half understand it.
    Exponential increase is why 1db makes a big difference in sound level.
    HSE website has some good basic guidance, otherwise you will 'boil your head' trying to understand it.
     
  8. crispey

    crispey crispey creme de la creme

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    #8 crispey, Mar 18, 2017
    What does your v5 say it should be?
     
  9. H.O.

    H.O. Noble Member

    Nov 28, 2015
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    #9 H.O., Mar 18, 2017
    2003 Bonnie not listed on V5, however its on the VIN plate as 91@3650 rpm
     
  10. thebiglad

    thebiglad Old fart, still riding !

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    #10 thebiglad, Mar 18, 2017
    Every increase of 3db equates to doubling the sound level, if I remember correctly ??
     
  11. Dougie D

    Dougie D Crème de la Crème

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    #11 Dougie D, Mar 18, 2017
    didn't realize it told you on the V5,although that will be for the standard pipe which is not too loud
     
  12. Dougie D

    Dougie D Crème de la Crème

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    #12 Dougie D, Mar 18, 2017
    it looks as if anything over 100db is seriously loud, i've had harleys for over 15 years( i'm begining to doubt that figure of 105db for the V&H exhaust with baffles) and it was only when i had a Ducati with termys on that i started getting Tinnitus..coincidence?? it wasn't as loud as the Harleys but maybe it's something to do with the tone of the exhaust??
     
  13. MickEng

    MickEng Noble Member

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    #13 MickEng, Mar 18, 2017
    In very simple terms for your safety.
    85db for 8 hours would cause hearing damage.
    100db for 15 minutes would cause hearing damage.
    Using ear plugs or ear defenders significantly reduces the risk dependant on the specification chosen.
     
  14. H.O.

    H.O. Noble Member

    Nov 28, 2015
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    #14 H.O., Mar 18, 2017
    Whats the excuse for my Mrs 'selective hearing' then?
    Big decibels in the kitchen?
     
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  15. MickEng

    MickEng Noble Member

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    #15 MickEng, Mar 18, 2017
    That comes into a totally different calculation. lol
    But I can assure you, you are not alone!
     
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  16. 45Brit2017

    45Brit2017 Well-Known Member

    May 30, 2017
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    #16 45Brit2017, Aug 28, 2017
    My 2013 T100 has Dunstalls fitted and they are pretty loud, a nice sound but I'm certain that there is no real benefit and they get an Advisory on the MoT.

    Then again, so does my Sportster..
     
  17. swampy61

    swampy61 Well-Known Member

    Mar 29, 2020
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    #17 swampy61, Oct 19, 2020
    2015 thruxton is 88 stationary and 78drive by at 3700 rpm.
     
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