In Reply to: Speaking of missing the point....., vsfoxe [Profile/Gallery] , Mon, 23 Nov 2009 21:17:31

I ran a Cooper S in SCCA C sedan in early 70's : Cast Iron everything, 3 main crank, Flat tappets, 3 ex ports 2 intake.. Trans box as the sump, differential bushings rather than bearings . Oil Shear degradation was horrific. Oil lasted a weekend race session ONLY, you could feel it in the loss of shift quality. Castrol R (yes Bean Oil) was MUCH better at Shear ..the trans gears just chewed the hell out of the oil V quickly. But "R" turned to jelly when the ambient temps were below say 60 degrees (memory :-)) so it had a complication as well.
I have a 'Current model' Honda 600rr and a 81 Yama rd350lc 2 stroke in my garage.
The Honda uses Honda GN4 oil..well Dohh! and not just for warranty reasons. That's one seriously sophisticated/complex motor .. 125 hp out of 599cc.
My 350 uses GL$ 75/85 Gear oil in it's transbox simply because it works better (note.. that 'gear oils' Use an entirely different viscosity index than Motor oils and 75/85 is virtually the same viscosty than 10/30 engine oil... true)
The GL4 replaced Yamalube 10/40 in the trans, because as the engine warmed, neutral became increasingly difficult to find A serious and often dangerous issue on a sequential shift box. GL4 eliminated that problem entirely. In fact the shifting on the ancient Yama is Loads faster slicker than my Hondas' and It has OEM undercut dogs (google :-) for an alleged v good shift action , as typified by all honda machinery. But there's NO adding DIY additives as the trans and engine share the same oil... (See the Sophisticated and V expensive line above)
Honestly don't know what effect Zinc has , but it's going to take a bit more convincing than some "web Page" babble.



posted by 64.180.6...

• ZDDP oil mixtures, Landjet , Sun, 22 Nov 2009 20:03:39
  • Oil for 60 yr old engines?, derf, Mon, 23 Nov 2009 08:57:55
    • Re: you're missing the point..., Simon S, Mon, 23 Nov 2009 09:39:07
      • Re: you're missing the point..., Bob_SAAB_101 , Mon, 23 Nov 2009 16:00:33
        • Re: I'd still use good synthetics in my engine. nm, Simon S, Mon, 23 Nov 2009 17:15:28
          • Re: I'd still use good synthetics in my engine. nm, Landjet , Mon, 23 Nov 2009 18:25:11
        • Re: you're missing the point..., Landjet , Mon, 23 Nov 2009 16:53:03
          • Speaking of missing the point....., vsfoxe , Mon, 23 Nov 2009 21:17:31
            • not missing the point....., derf, Tue, 24 Nov 2009 12:29:00 <-- Viewing This Message
              • Re: not missing the point....., Landjet , Tue, 24 Nov 2009 15:39:21
            • Re: Speaking of missing the point....., Simon S, Tue, 24 Nov 2009 09:44:38

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