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Dyno run (2017)

Discussion in 'Norton Commando Motorcycles (Classic)' started by Fullauto, Oct 23, 2017.

  1. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    That's what I'm sayin
    It's the official weight but the thing looks like the HMS Queen Mary when parked next to my 438 lb dry weight Commando.

    Glen
     
    Fast Eddie likes this.
  2. pommie john

    pommie john

    Joined:
    Nov 18, 2005


    At high speed aero is more important.

    I read a figure somewhere that at 100MPH, to gain a 5% increase in speed you need a 5% reduction in drag or a 16% increase in power. That goes up exponentially as you get faster. I'd guess that down the back straight at Snetterton you'd be pulling 140 MPH? At that speed it's drag that makes the difference.

    Weight doesn't make much difference to top speed. The dry lakes racers here in Australia add ballast to get traction on the salt surface.

    Weight makes a difference to acceleration, ( which obviously makes a difference to how quickly you get to the top speed) so could have been a factor in your case.
     
  3. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    No arguments there John. In fact I fully agree, I guess I was over simplifying...

    As you say, the weight difference would have got Norman half way down the straight quicker. He’s also a good rider rememebr, so likely carrying more corner speed onto the back straight than an amateur like me.

    Normans bike is a JPN work rep, so is very slippery. Being half the weight of me means he’s half the size. Where I’d be poking out from behind my faring all over the place, he was tucked in like a wind tunnel dummy!
     
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    I think you’re being disrespectful to HMS Queen Mary there Glen ... ;)

    46AB754F-36E5-4428-855A-1BAC18DE382A.jpeg
     
  5. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Interesting that BMW ‘claim’ a 30kg or 66lbs difference between wet and dry.

    That’s a lot of ‘wetness’ isn’t it??

    As Glen mentioned, perhaps it includes the battery? There’s no chain to remove so I wonder what other things they managed to include in the ‘wet’ part of the weight ?

    Serious question: does anyone know what ‘wet weight’ really means? Is it a full tank of petrol or a specified amount? What items are manufacturers allowed to exclude in the ‘dry’ weight?
     
  6. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    I bet they dont include the panniers or top box. Or coolant, oil and fork oil. LOL.
     
  7. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Yes, they state the weight is w/o panniers etc.

    I’d still like to know how they get 66lbs of liquid though!

    Maybe it includes a barrel of finest weissbier...?
     
  8. pommie john

    pommie john

    Joined:
    Nov 18, 2005
    Must be a full tank of fuel.....25 litres weighs what, 18kg? 4 litres of oil, 3kg. Coolant say 3kg. That's over 50lb.
     
  9. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    A
    And a battery...
     

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