SOHC.co.uk Forums > CB750
Clutch plates
Trigger:
I always run 20/50 high zinc in the summer ;)
Pauarc:
What does the high zinc do
K2-K6:
--- Quote from: Pauarc on July 08, 2023, 04:27:53 PM ---What does the high zinc do
--- End quote ---
Zinc "zddp" is only really active when the oil film breaks down due to very high pressure. It protects against cold weld/spalling in metal to metal contact areas such as cam lobes and followers, also gear teeth faces etc.
Not so relevant to crankshaft, pistons etc.
McCabe-Thiele (Ted):
Too much Zinc can clog the engine oil paths in the right concentration it helps protect camshaft parts.
STP contains zinc.
Millers Oils recommends an optimum amount between 1000 – 1400 ppm of ZDDP. Too little won't offer enough anti-wear protection, and too much will not provide increased levels of protection, but can actually create friction and increase wear due to the 'over-plating' of components.
.
Pauarc:
Can you add zinc to the oil
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