SOHC.co.uk Forums > CB350/400

Strange question

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Seabeowner:

--- Quote from: allankelly1 on September 17, 2021, 07:47:39 PM ---Just wondered out of curiosity how much oil in litres per min a CB400F oil pump displaces on tick over

Any oil pump experts out there?

Best wishes Al


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--- End quote ---
Depends on how worn your bearings are.

TrickyMicky:
To my simplistic way of thinking, worn bearings should not alter the output of the pump. If the pump is in good order it will still pass the same amount of liquid at a given speed. Don't forget that you cannot compress a liquid, only a gas. If the pressure gets too high then there should be a by-pass valve somewhere, otherwise something will definitely break. Look what happens to the conrods and crankshafts in diesel engines when they suck in some water.

taysidedragon:

--- Quote from: TrickyMicky on September 19, 2021, 08:46:53 AM ---To my simplistic way of thinking, worn bearings should not alter the output of the pump. If the pump is in good order it will still pass the same amount of liquid at a given speed. Don't forget that you cannot compress a liquid, only a gas. If the pressure gets too high then there should be a by-pass valve somewhere, otherwise something will definitely break. Look what happens to the conrods and crankshafts in diesel engines when they suck in some water.

--- End quote ---

Dead right. Wear in the pump itself will affect the output. Wear in the engine bearings affects the oil pressure.

SteveD CB500K0:
Isn’t there a pressure relief valve in the oil filter bolt?


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Bryanj:
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

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