SOHC.co.uk Forums > CB350/400
Strange question
K2-K6:
The one in the pump (virtually all engines have this) is to protect the oil pump drive while the oil is thicker when cold. Essentially it will hydraulic lock (dynamic and relevant to the system resistance that is normal oil flow) if revved under those conditions and risk shearing the drive arrangement.
allankelly1:
Thanks for all the answers everybody
The original reason was that I have just finished off my oil cooler installation
But on initial checks during cranking on the starter (before firing the engine as wanted to ensure the system was flowing oil) there seemed to be less flow thru the cooler than I was expecting?
But then I remembered the there is a bypass port in the take off plate
So most flow goes direct to the engine via this port with a percentage flowing via the cooler hence my initial worry about lack of flow of oil
Again many thanks for all the answers Al
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400 Cafe Racer:
--- Quote from: Bryanj on September 19, 2021, 12:52:20 PM ---Thats only for if the filter blocks so oil bypasses the filter and lubes the engine albeit with contaminated oil Steve, there is an over pressure relief built into the pump itself and operates at about 65psi if memory serves
--- End quote ---
Hi Bryan, ;)
I can confirm this 65psi as I recently fitted an oil pressure gauge which tops out at 65psi when the engine is started cold. A good indication the oil pressure relief valve is functioning correctly.
Dennis
Bryanj:
Unless you arr racingan oil cooler is overkill if not fitted with a thermostatic bypass
allankelly1:
No just prepping as planning to fit a 460cc lump in the future and an oil cooler was highly recommended as part of the changes when going up to 460cc
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