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It's a long way to 920 type(rary)

Discussion in 'Norton Commando Motorcycles (Classic)' started by yves norton seeley, Jan 14, 2018.

  1. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    You dam right Nigel, I will keep it like this
    To day I discover that the Alton alternator was not working anymore, no charge! I give Paul from Alton a call and he will send me a new stator and rotor, I hope for free...
    I will receive it at friday, the bike will be ready for the WE
    Yves
     
  2. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    Yes it would be a bit wild for the street. The other option is Nitrous. See 920 land speed racer on Nitrous below. Not for city cruising.

    [​IMG]
     
  3. 84ok

    84ok

    Joined:
    Aug 10, 2014
  4. cjandme

    cjandme

    Joined:
    Feb 5, 2011
    I seem to remember reading somewhere that Steve Maney was getting 100hp out his race bikes (and that's a race bike not a street going beauty that you want to spend time on)
     
  5. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    The guy goes thru hell to get 70 HP and needs 100 right away!
    Gotta admire the spirit!:)

    Since you aren't concerned about using original Norton parts, I can think of a couple of choices for the desired output. Both only require Norton tank decals:D

    Glen
     
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  6. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Well, when I see what you have to do to find 30 HP more, I will not do it, first I don't have the skills, I think only a few genius in the world can do the job.
    IF I can find 5HP more I will be very happy
    And more: to me the Seeley frame reach is limits with 70 or 75 HP, at least on the roads here in Belgium, you have always a holl or a bumb in the corner and this make a hard work for the Seeley to stay on the road when in full acceleration at least for me at 68 years old, don't misunderstand me, it stay sano, but the bike says don't go any farther, you are close to the limits...
    And I wish to keep the engine in one piece, the final goal is not to work a few hunderd hours to ride 10 minutes and to find conrods salade on the road
    Yves
     
  7. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    At some point you have to say it's developed as far as reasonably possible, I think you are there Yves , good job.
    Now it will be interesting to see how the durability is.

    Glen
     
  8. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    +1 !!
     
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  9. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Also Yves, we should all remember ‘relativity’ here.

    A lot of bhp figures are pure nonsense.

    Even the factory figures were, shall we say, extremely optimistic.

    Many of us amateurs use dynos and have no base line calibration to work to.

    Then there are ‘rogue’ dynos out there too.

    Then there are the ‘estimaters’ Who think that the stock bike had 65bhp, and they have added a few tweaks, so they must be over 70bhp right? Wrong!

    At the end of all the talk, a stock road going 850 is probably circa low 40s rwhp. Add a single carb and you’re into the mid to high 30s.

    So, if you can creep over 70, you will be in the ball park of double the rwhp of most real life road going Cdos you’re ever likely to come across.

    And, the vast majority of their owners (understandably) don’t want to thrash a 40-50 year old bike. So in reality, they never even see the 35-40 rwhp that they have.

    So, as Glen says, durability is probably your main priority now IMHO, meaning, having the confidence to fully utilise all 70 horses wherever and whenever you want to, without worry.

    Because then, all BS aside, apart from a very few well built big Vin specials and / or big triples or Cdos, you are unlikely to meet any old Brit bike on the road who will see anything other than your disappearing rear wheel!

    You’ll meet them in the bars of course... but that’s another topic entirely ...!
     
    Last edited: Apr 26, 2018
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  10. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi Nigel and Glen, of course, I can not say anything about durability yet, but I am confident, I use the best components on the market and I will try to keep the engine in good shape
    There are still steps in the unknow like using Nicasil on cast iron sleeves, not many Codo owners did it before so far I know, but who not dear not win...
    A few words about Alton, I discover yesterday that the alternator was dead, wel, the new parts will be there tomorow, what a service, thanks Paul!
    Once the new alternator will be fitted I will try to find the perfect carburation on the FCR, but Frank MX parts, my suplier for FCR parts don't antsword the last two days.
    It will be raining the entire WE here in Belgium so I don't worry to match if I can not do any road test this WE
    Yves
     
  11. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi Jim thanks for your very good parts and advises. I wish to try different lenght of intake manifolds, can you make a drawing?
    The problem is that I use K&N filters and there is no place to use longer inlets on the Seeley MK 3 frame, or I have to find other kind of air filters
    Thanks Yves
     
  12. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    If you are out of room then you are stuck with the intake length that you have.

    On a race bike without airfilters you can use longer intake velocity stacks or extended intake manifolds.

    Measuring from the head (where the manifolds bolt on) to the end of the velocity stack - aim for 10-1/2" That's a lot longer than usual. But this may only be good for race bikes - you will have to test it.

    See Ron Woods 84 HP 750 short stroke and the long intake length.
    [​IMG]
    [​IMG]
     
    Last edited: Apr 26, 2018
  13. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    Regarding 100 hp claims, there might be some confusion between rear wheel and crankshaft horsepower. The best 920 engine I've seen made 88 hp (at a bit over 7,000 rpm) at the rear wheel (and 94 ft-lbs of torque), and a correction factor was used for the drivetrain loss that gave just over 100 hp at the crankshaft. That was a full on Steve Maney race engine, so 70 or so hp at the rear wheel for a street bike is actually quite respectable. Eldo, here on the forum mentioned that his Herb Becker built 920 made 90 hp at the rear wheel, but that was a very highly tuned engine, built to make maximum top end horsepower for land speed racing, and probably would be terrible in a street bike.

    Yves, I'm sure you'll find a few more ponies with some more tuning, but like fast eddy said, if you made the more extreme mods to get to the 85 or 90 hp range, you might find the bike much less fun to ride.

    Ken
     
    Last edited: Apr 26, 2018
  14. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    About durability: My 850 engine with the Jim Schmidt crank, rods, pistons and camshaft / followers dont need to be open in 30.000 kms
    Yves
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Good points Ken.

    The most I’ve seen on the dyno with my old Brit stuff is around 87rwhp out of my old 900 Dresda Nourish. But I ran it at around 84, I ‘gave away’ 3 peak hp for a better overall curve. That was a light bike, and that bhp made it really quite quick.

    That was on the same dyno I still use, the one that shows I’m at 65rwhp on the Trident Hunter.

    So I only need another 20 out of that to match the Nourish !!

    Like Yves, I’m also building a 920 motor (but far more slowly), and am also hoping it lands somewhere in the low 70s rwhp whilst still being ‘streetable’.

    It’s all good fun though isn’t it?

    Isn’t it ?!
     
  16. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    One day I'll put my stock MK3 on a dyno just for fun.
    It certainly acts like it has a bit more than low40s
    It always surprised me that it feels decent even after spending time on the modern high powered bikes. I think it is because the peak number everyone looks at is not actually in use on the road, or at best just for a split second before a shift.

    Maybe best not to put a number to it!

    Glen
     
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  17. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    I friend of mine has got a low mileage MK111, stock apart from peashooters, ham can and Boyer.

    I will try VERY hard to get him to accompany me and put his on the dyno next time I go.
     
  18. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi there,
    I agree with Nigel about the relativity of a dyno run, but every year there is a drag race here in Belgium and I participed every year, this will be the judge!
    I still have the records from my time on the 1/8 mile track wit the 820, so I will do it with the 920 in september... and see!
    The problem is my weight: 0.1 ton, of course I can put another rider on my bike, but if we want to have a comparaison I need to do it my self.
    My weight is a real problem, if I wish to see my dick, I must put motorcycle mirrors on my knees
    The problem with the Alton stator and rotor is fixed with new parts, so I hope it will not rain tomorow so Bruno can test the Seeley and give you is impresions
    Keep you posted
    Yves
     
  19. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Yves / Bruno,

    You seem like nice guys... And you seem like you use your bikes properly... So the serious question is...

    When are you going to bring your fabulous classic English bikes over here to one of the fabulous classic track events that we have in England ?

    The Festival of 1000 bikes at the iconic Mallory Park, which is the only event when that allows the track to be used in its original layout without all the stupid modern chicanes.

    Or the Beezumoh festival put on by the TR3OC. If you boys came with me to that we could set up our own Trident Hunters Club...!

    Let me know, and I’ll send out Trident Hunters Club membership forms to you...
     
  20. Chris

    Chris VIP MEMBER

    Joined:
    Jan 21, 2008
    Can I bring my Tridents as well.lol

    Chris
     
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