103.5dB(A) at 7k RPM

Discussion in 'UK Motorcycles' started by Krusty, Jun 24, 2006.

  1. Krusty

    Krusty Guest

    That's a bit better than the previous 117dB(A) at tickover. All I've
    got to do know is strip the tailpipes down again & replace the
    temporary lockwire with weld, then get the PCIII re-mapped. Making
    baffles is such good fun.

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    Krusty.

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    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 24, 2006
    #1
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  2. Krusty

    Pete Fisher Guest

    One assumes that's at the same distance, so very good result. Any idea
    what effect if any it will have had on power/good pick up ? Baffles can
    be tricky devils when the motor is under load, particularly when given
    the beans from low revs.

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    Pete Fisher, Jun 24, 2006
    #2
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  3. Krusty

    Krusty Guest

    Yep same distance - 1 metre, vertically level, 45 degrees to the side.
    I'm sure it'll drop the peak power a bit but I can't say I've noticed
    when riding it. However low down it feels a bit stronger, possibly
    because it's now got some back pressure (they were totally open before).

    To be honest I'm not really fussed if it loses a few BHP. If it was
    that important I would've bought a Jap litre bike & saved £8k in the
    process. It'll still make over 140bhp which is plenty for the type of
    riding I like (the bendier the better).

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    Krusty.

    http://www.muddystuff.co.uk
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    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 24, 2006
    #3
  4. Krusty

    Pete Fisher Guest

    More of a problem on singles in particular. I fitted a Frigerio
    competition can on the big bore Nordie a few years ago. Power was up,
    but although carburation appeared spot on, if you gave it a big handful
    at low revs it would bog down atrociously. When I bought it he mentioned
    something about drilling out three pop-rivets and pulling out the last
    little tail pipe baffle. I did this between runs at Gurston Down hill
    climb and the bike was utterly transformed. Noise like a Bofors Gun now
    though and barely passes a noise test. Fortunately I know how to play
    the system a bit at the venue most likely to have me on it (Prescott).


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    | Pete Fisher at Home: |
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    Pete Fisher, Jun 24, 2006
    #4
  5. Krusty

    Andy Bonwick Guest

    On 24 Jun 2006 19:09:51 GMT, "Krusty" <>
    wrote:

    snip>
    Are they proper horses at the back wheel or la-la land claimed bhp?
    140bhp sounds a lot for an MV.
     
    Andy Bonwick, Jun 24, 2006
    #5
  6. Krusty

    Krusty Guest

    It was 129 at the wheel when I had it dyno'd[1], which equates to the
    mid 140s at the crank. That was with the factory RG3 full race system
    (98dB) which comes as standard with Sennas. Not bad for a 750 really.

    The factory claimed figure was 144 IIRC.

    [1]Dynotech near Basingstoke, who I believe had a hand in the Team UKRM
    bike.

    --
    Krusty.

    http://www.muddystuff.co.uk
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    Off-road classifieds

    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 24, 2006
    #6
  7. Krusty

    Krusty Guest

    I find it quite fascinating the way these things progress, especially
    with MV. When the first F4 750 came out in 2000 it was generally
    praised for its handling but panned for its lack of power (108-112
    rwhp). Then the Senna appeared in 2002 with even better handling & more
    power than any other 750 of the time. The GSX-R was always going to be
    the benchmark, & they surpassed it within two years of launching the
    first MV.

    Then they release the 1000 around two years ago, which is again a brand
    new engine design from the ground up. Jump forward to a month ago & it
    laps Jerez 1.4 seconds faster than anything from Japan at the
    Masterbike tests. That's a huge margin in anyone's books, & way beyond
    what I would've expected MV could achieve, especially considering their
    endless financial troubles.

    OK there's still a fairly substantial price difference between MV &
    anything else, but even so, it does make you wonder if the Japanese
    have really been trying in recent years. Or perhaps it's just that
    Tamburini really is that good.


    --
    Krusty.

    http://www.muddystuff.co.uk
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    Off-road classifieds

    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 24, 2006
    #7
  8. Krusty

    Krusty Guest

    Mebbe, but I can't see where they've spent it. It's not like the MV's
    dripping with hi-tech lightweight materials, or sitting on factory
    Ohlins suspenders or anything. In fact the only major differences to
    the Jap bikes are the trellis frame, single-sided swingarm & radial
    valve head. All of those have been tried & discarded by the Japs,
    except RV heads which Honda still use on XRs.

    It may be the MV's natural setup just suits a twisty circuit like
    Jerez, & it would get blown into the weeds at Mugello. Or perhaps its
    component parts work together just that tiny bit better than anything
    elses.

    --
    Krusty.

    http://www.muddystuff.co.uk
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    Off-road classifieds

    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 24, 2006
    #8
  9. Krusty

    Andy Bonwick Guest

    That's good for a 750. I've finally had my 10R on a dyno and I think
    it was 154bhp at the back wheel once it'd had a different air filter
    fitted. I was more interested in where it was producing power rather
    than how much so the nice straight line I saw was most pleasing.
    **** knows what KHI claim for my bike. It'll be a lot and it'll
    include an 'adjustment' to allow for the ram air factor.
    I took mine somewhere else where it was cheaper because everything's
    stuffed into an old barn.
     
    Andy Bonwick, Jun 25, 2006
    #9
  10. Krusty

    Krusty Guest

    Heh, or the haircuts I'll wager.

    --
    Krusty.

    http://www.muddystuff.co.uk
    http://www.muddystuff.us
    Off-road classifieds

    '02 MV Senna '03 Tiger (FOYRNB) '96 Tiger '79 Fantic 250
     
    Krusty, Jun 25, 2006
    #10
  11. Krusty

    deadmail Guest

    Holy fucking shit.

    I know Champ's felt fast. Well, very fast, but 150+ bhp is well...
     
    deadmail, Jun 25, 2006
    #11
  12. I managed to get my Duke down to 96dB(A) at 4k rpm after repacking them.
    This was using your suggested 1m, 45 degrees bit to measure. Still sounds
    fecking loud at full chat though and has a much deeper tone to it now.
    Strange thing is they both had exactly the same amount of packing put in but
    now the left hand one gets hotter than the right?
     
    Grimley_Feindish, Jun 25, 2006
    #12
  13. Krusty

    Andy Bonwick Guest

    It can't be worse than going to the Ramsey shed. Foz reckoned it was
    like something out of the original Mad Max and he wasn't far out.
     
    Andy Bonwick, Jun 30, 2006
    #13
  14. Krusty

    Andy Bonwick Guest

    I was well pleased with the figures. The best bit was that fitting a
    K&N airfilter gave me gains that worked out at less than £8 per bhp. I
    wish I could buy another 20 at that price.
     
    Andy Bonwick, Jun 30, 2006
    #14
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