SOHC.co.uk Forums > The Black Bomber Board
450/500T Startup
K2-K6:
Interesting how views can so oppose each other https://bobistheoilguy.com/forums/threads/1965-honda-cb450-black-bomber-oil-oil-filter-cleaning-technique-and-oci.35441/
The last poster is, I believe more understanding of just why honda chose what they did.
The "running cams straight in aluminium plain bearings" observation is just funny, as literally everything has gone the same way in following Honda. That's as outdated and with less understanding of the fundamental design as you can get.
royhall:
Proves nothing I know but just started my engine from cold with the exhaust valve cover off. Am using 10W40 multigrade and the oil supply took a counted 4 seconds to appear. Slowly at first building up to a good supply a few seconds later to the point I stopped the engine as oil was being thrown out. That's 4 seconds not 90. I would say if it's taking 90 seconds your engine is just worn out simple as that. Where did this mythical 90 second quote come from anyway, I keep seeing it quoted.
I should add that the engine was run this morning so the galleries etc were possibly already full, but the engine was cold.
The spec for the oil states for all use 10W40 or 20W50. Then single grade as you quoted for special circumstances.
K2-K6:
I think the same, the oil delivery "problem" at starting appears highly inaccurate, essentially a red herring. What it does do as you point out Roy, is almost to direct everything toward that as some ultimately to be solved problem, almost to the exclusion of other rational thinking and engine condition.
As a disinct marker, any camshaft showing real wear on base circle hasn't suffered from lack of oil, but completely lack of clearance. It's watching that like a hawk, particularly after rebuilding that would seem the most beneficial to long life.
royhall:
--- Quote from: K2-K6 on February 05, 2021, 03:52:15 PM ---I think the same, the oil delivery "problem" at starting appears highly inaccurate, essentially a red herring. What it does do as you point out Roy, is almost to direct everything toward that as some ultimately to be solved problem, almost to the exclusion of other rational thinking and engine condition.
As a disinct marker, any camshaft showing real wear on base circle hasn't suffered from lack of oil, but completely lack of clearance. It's watching that like a hawk, particularly after rebuilding that would seem the most beneficial to long life.
--- End quote ---
Couldn't agree more. I still think pump condition is a prime culprit. The pumps seem to be ignored during a rebuild as they have nothing to compare them to. When I compared my NOS pump against the worst of the other three the difference was drastic with 6 thou worn off the piston along with ovality and quite bad scoring. Now that's not going to help pressure and flow no matter what the viscosity of the oil.
K2-K6:
I understand that the original 40 viscosity rating for multigrade was there because of ability of oil to hold on to that through a complete service interval. In effect it's a system designed for 30 and they were trying to achieve that at the end of an oil's life, hence starting at 40 with expected decay to still make target. Newer oils, in reality, are more stable. Along with consideration for change intervals not being neglected, and avoiding running too rich to dilute the oil, then highest viscosity of 30 should see the best overall performance.
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