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CB400f -does anyone have an oil pressure gauge fitted, what readings do you get?

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400 Cafe Racer:
Hi Guys,

The idiot oil pressure light tells you very little. I wondered if anyone actually has an oil pressure gauge permanently fitted and what sort of readings are typical at different temperatures.

Thanks :)

Dennis

 

McCabe-Thiele (Ted):
Back in the day you could buy high pressure oil switches for a BMC Mini that went out when the engine was idling. Sometimes like a cylinder pressure gauge it's often best not to know. The factory dash oil pressure gauge on my W124 Merc had a maximum reading of 45 psi so anything higher was superfluous.

400 Cafe Racer:

--- Quote from: Macabethiele (Ted) on October 03, 2021, 07:24:42 PM ---Back in the day you could buy high pressure oil switches for a BMC Mini that went out when the engine was idling. Sometimes like a cylinder pressure gauge it's often best not to know. The factory dash oil pressure gauge on my W124 Merc had a maximum reading of 45 psi so anything higher was superfluece.

--- End quote ---

Hi Ted,
Thanks.
Reliable information is always good, so you always knew if anything changed on your Merc.
According to Haynes manual it does not come on until until 4.3psi - in the danger zone, which leaves a lot to be desired in the way of information while riding, so it would be interesting to see users readings if possible.

Nurse Julie:
Interesting. The oil pressure switch, being situated on the top crankcase only tells you that the oil pressure is high enough to protect the crank etc. All our bikes have oil jets fitted, which are oil restrictors, they restrict the oil going to the top end of the bike, camshaft etc in favour of keeping the components in the bottom end well oiled. Top end oil starvation can be as dangerous and expensive as bottom end oil starvation, I wonder why Honda, in this instance, chose not to have the oil pressure switch situated at the top end 🤔🤔🤔🤔

McCabe-Thiele (Ted):

--- Quote from: Oddjob on October 03, 2021, 08:47:06 PM ---I did fit a pressure gauge back in the late 70s, Smiths iirc, I seem to recall it used to run at 80psi, came in useful one day as whilst on a run down the motorway it suddenly dropped pressure like a stone, turned out the oil filter, which was a pattern filter, had collapsed and went into a spiral shape as it did so. Never fitted anything but genuine Honda since on a SOHC.

--- End quote ---

You did well to notice the drop in pressure on a gauge - they do not shout at you like a warning lamp!

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