1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

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

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

  1. jseng1

    jseng1

    Joined:
    Nov 26, 2009
    If they machined the gasket then there might have been a thin spot and that is where the gasket blew. There could have been a mistake fastening down such a thin piece of metal and trying to mill it to a perfect thickness.
     
  2. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi there,
    A long day, travelling to Solingen in Germany, 500 kms on the road, to meet Steven, the owner from Elmeso Reban, Elmeso is a small workshop with a hudge of knowledge about HG, Steven is a very fine man and he take all the time needed to explain me the secrets of the HG.
    I take a original 850 composite gasket with me, and he says it is good made, His opinion is to make a composite HG, but different problems appear: 1.00mm is the minimum tickness and I wish 0.6mm...
    The 1mm HG will crush 10%, what will says that when set the HG will be 0.9mm, to ritch the 1.1mm piston to head clerance I should need to mill 0.3mm from the head, not a big deal I think...
    Like the original HG, is proposal is nearly the same, a steel plate with composite on both faces, the difference with the original is the composite: His composite is made of glass fiber with graphyte and this is more neutral as the original and will beter wirstand the heat and pressure.
    Like on the original he will put a sreel ring around the bores the inside diameter will be 81.6 or 81.7mm to fit the 81.4mm from the squish band from my cylinder head, Steven says that the inside diameter will flat out to 81.4 once the head is on place and torque. To him there will not be any problem as long you keep 6mm gasket between the bore and bolt holes or pushrod tunnels, this will be ok but not for the oil return hole... the hole is 6mm, so he wish to reduce the hole to 4mm, the question is: will 4mm enough to drain the oil away??
    The second solution for the drain hole is to offset 2mm to the outside of the gasket and file the holes in the direction of the offset on the head and cylinder to ritch the gasket oil drain hole.
    The third solution is to make a outside drain tube, like Maney do on his stage 3 heads, but I never see one, so if someone as a pic from this, I will be very gratefull.
    The gaskets will be ready in 4 weeks from now. feel free tyo give me your valuable opinions about the HG story
    Thanks
    Yves
     
  3. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Last edited: May 29, 2018
  4. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    BTW I just measured a Steve Maney copper head gasket and the oil drain hole is not 6mm, it is 5.1m (0.2"). And by recollection the drain hole in cast barrels is 4mm, I could check that but better to look at your own Maney barrels.
     
  5. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi Steve,
    I think I will go for the external oil drain, but where should I conect the tube on the cases?
    Thanks
    Yves
     
  6. storm42

    storm42 VIP MEMBER

    Joined:
    Jul 20, 2011
    Hi Yves,
    I have just been and took this pic, the pipe to the right of the breather block is the pipe from the head, hope this helps. The hole was already in my cases, i just screwed a airline connector into it and attached the pipe.

    Will you be at Chimay?, I have seen your bike there before and would like to see it again this year.

    [​IMG]
     
  7. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Yes I will be there, I will be also at Spa and Gedine
    See you there
    Yves
     
  8. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    The picture SteveA posted above is a Ron Wood/Axtell short stroke 750 head. Steve Maney did his pretty much the same way. These are pictures of a Maney Stage 3 head with the external oil return.

    Maney S3 Exhaust Port and Oil Drain 1200.jpg

    Maney S3 Top and Oil Drain 1200.jpg

    Ken
     
  9. storm42

    storm42 VIP MEMBER

    Joined:
    Jul 20, 2011
    Nice one, I have booked for Spa and have a garage this year, see you there.

    Found this picture i took in 2015, i believe it is your bike.

    [​IMG]
     
  10. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Yes, it's my bike before I change the fuel tank, the discs for Fontana drums and the Norton forks for a Ceriani
     
  11. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi there,
    A lot of thanks to all of you that send me pics from the external oil line
    Yves
     
  12. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Where Storm42 shows it is good and can be easy on any Maney cases. But I wonder if some effort might not make it possible to have it flow some oil onto the intermediate gear/cam chain?
     
  13. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    This is how I routed the drain line on mine.

    Primary Mockup 1200.jpg

    Ken
     
  14. yves norton seeley

    yves norton seeley

    Joined:
    Feb 13, 2014
    Hi Ken,
    It is not on the block off plate, why not?
    Yves
     
  15. SteveBorland

    SteveBorland

    Joined:
    Nov 15, 2010
    Ah, I will be at Spa too, hopefully with my rather tatty 850. I'll keep an eye out for both Storm42 & Yves :)
     
  16. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Because Steve puts a hole there doesn’t he?
     
  17. baz

    baz VIP MEMBER

    Joined:
    May 26, 2010
    That's how I have seen it done,the oil drain goes to the top of the timing side crankcase
     
    SteveA likes this.
  18. storm42

    storm42 VIP MEMBER

    Joined:
    Jul 20, 2011
    Nice one, I will be in one of the F1 pit boxes ( don't know which one yet) so should be easy to find, Be good to meet up.
     
  19. SteveA

    SteveA VIP MEMBER

    Joined:
    Dec 20, 2011
    Not in my cases, only the hole with two threaded holes spaced for a breather mounting that Ken and I have fitted a blanking plate to.
     
  20. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Ken’s is a 1007 though, which has to have the external oil pipe, so although I’m not 100% sure, I imagine the 1007 cases come with that extra hole (check out the cases shown on Steve’s site, they have the hole).
    Perhaps Ken, or another 1007er can confirm?
     
  21. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    That's correct, Nigel, it is a 1007 crankcase, and came from Steve with a hole for the drain hose fitting.

    Ken