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Follower scar oil tests

Discussion in 'Norton Commando Motorcycles (Classic)' started by comnoz, Aug 21, 2018.

  1. Tiger Shark

    Tiger Shark VIP MEMBER

    Joined:
    Jan 25, 2015
    I think it was RP Max Cycle 20W/50 that was suitable for wet clutches and tested by Jim.
     
  2. Onder

    Onder

    Joined:
    May 11, 2010
    I too have four bikes on the road and they do 1500 miles each. This year they are all using XL 20-5o. Pulling the oil
    last week I noticed that the oil does seem to be fairly dark . Id say there was one day that was a bit warmish and the OP was lower than I would see when cooler.
    So maybe that RP might be a better plan for next season.
     
  3. comnoz

    comnoz VIP MEMBER

    Joined:
    Dec 10, 2008
    Yes, It is Royal Purple Max Cycle. It is available in 10-40 and 20-50. Both grades tested about the same.

    I run the 10-40 in my FJ .

    I run HPS 10-40 in my 68 Mercedes 2.8 liter.
     
  4. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Thanks Jim.
     
  5. Gilesy

    Gilesy VIP MEMBER

    Joined:
    Aug 27, 2017
    Yes, thanks for that.
     
  6. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
  7. robs ss

    robs ss VIP MEMBER

    Joined:
    Aug 16, 2016
    Still, if you're running a belt & dry clutch, the choice for a Norton twin (961's aside) is Royal Purple HPS 20-50?
     
  8. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    That seems to be the verdict if you want the very best protection.
     
    JimC likes this.
  9. elefantrider

    elefantrider VIP MEMBER

    Joined:
    Apr 6, 2013
    HPS 20w50 is $7 a quart at my local speed shop. They have plenty stock with 2 different types of RP bottles and labels but can't tell me which is the latest one. I gather they don't sell much.

    BelRay V-Twin costs almost twice as much online. I don't use it since.
     
  10. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    If I were you, I’d stock up!
     
  11. jbruney

    jbruney

    Joined:
    Jan 5, 2019
    Okay okay… I've been following this oil research and use pretty closely since coming here last year, and have finally become convinced to make the change to the synthetic. I've read it all, but there being so much info to glean couldn't make a decision until now. So RP 20-50 HPS is going in my old motor when next I change oil..... This last few pages of discussion is what threw the switch because I'm hesitant to tamper with such a sweet running relatively higher mileage motor. Any deviation from what has been working is difficult. My 850 is transitioning into the new millennium.... Hopefully without a bang.
     
    Fast Eddie likes this.
  12. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    Does the XPR work with a wet clutch? I have seen generic commentary that intuits it should, but nothing specific.

    HPS 20-50 is cheaper per liter here in NZ than Mobil 1.
     
  13. comnoz

    comnoz VIP MEMBER

    Joined:
    Dec 10, 2008
    The XPR is not designed for a wet clutch but it may work fine in some applications.

    However the XPR is definitely not suitable for an air cooled pushrod motor. It is formulated for modern engines.
     
    jbruney likes this.
  14. gortnipper

    gortnipper VIP MEMBER

    Joined:
    Nov 11, 2013
    I have some and was wondering about it for my 848.
     
  15. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    WTF is a Zuma...?
     
  16. Triton Thrasher

    Triton Thrasher

    Joined:
    Feb 10, 2009
    He was Prez of South Africa. Don’t know what he’s doing these days.
     
    Matchless and Fast Eddie like this.
  17. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Well, if it’s good for maintaining the performance and reliability of politicians, we should try using some over here !!
     
    Gilesy likes this.
  18. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Jim,

    Just getting back to the ‘best oil for a wet clutch’ question...

    The Royal Purple Max Cycle is in your table titled “Oil Protection For Stock, Low Compression Norton Commandos”.

    The data recorded was: Royal Purple Max Cycle 20W50 syn: Load: 170. Temp: 1.10

    There appear to be many oils above this. I chose the Bel Ray 20w50 V Twin synthetic which is in the table titled “Extreme Oil Protection For Norton Commandos”.

    The data recorded was: Bel-Ray 10W50 V-twin synthetic: Load: 500. Temp: 3.58.

    I’m struggling to see why you recommend the RP Max Cycle over the BR v Twin syn ??
     
  19. Hillbilly Bike

    Hillbilly Bike

    Joined:
    Oct 18, 2018
    There's been a lot of disussions about "scar tests" on auto racing forums...Many well experienced builders dismiss it as have no relevence to operating conditions inside the engine...And many lower rated "scar test" oils perform very well in actual running engines...
    To each his own beliefs...
     
    Steves likes this.
  20. worntorn

    worntorn

    Joined:
    Dec 22, 2006
    There are always people who will dismiss the work done by others, especially if it messes with their beliefs.

    Glen
     

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