Are oil pressure gauges normally damped? (fluctuating test gauge)
25-06-2013, 08:56 PM
#1
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Are oil pressure gauges normally damped? (fluctuating test gauge)
As title really.
I thought my oil pressure gauge was shagged (it was showing so low a YB would be noisy if not dead at this pressure!) so we put a different gauge (a non-car one) directly to the port by the turbo oil feed, and while the pressure isn't bad at all (3bar at warm idle, well over 4bar when revved warm etc), the gauge flutters like mad?
I'm presuming aftermarket gauges are damped to stop it fluttering, or is something up?
If so, what?
Cheers
I thought my oil pressure gauge was shagged (it was showing so low a YB would be noisy if not dead at this pressure!) so we put a different gauge (a non-car one) directly to the port by the turbo oil feed, and while the pressure isn't bad at all (3bar at warm idle, well over 4bar when revved warm etc), the gauge flutters like mad?
I'm presuming aftermarket gauges are damped to stop it fluttering, or is something up?
If so, what?
Cheers
25-06-2013, 09:48 PM
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And it flutters all over the shop.
I suspect ones intended to be oil pressure gauges in cars are damped to stop the fluttering?
27-06-2013, 10:10 AM
#6
Have you had the pump off at all stav? sounds like the pump could be worn and pulsing, a bit like when the seals go on a pressure washer it will pulse.
id avoid giving it beans till its sorted.
or it could be the a weak spring in the pressure relief side of the pump, its a ball bearing used a seal so if the pressure gets too high it pushes open the bearing.
imo it sounds pump related!
i of course could be very wrong tho
id avoid giving it beans till its sorted.
or it could be the a weak spring in the pressure relief side of the pump, its a ball bearing used a seal so if the pressure gets too high it pushes open the bearing.
imo it sounds pump related!
i of course could be very wrong tho
27-06-2013, 11:10 AM
#7
does this happen through the rev range?
the pump uses a 4 toothed wheel in a 5 slotted recess, I would have thought the output would be constant not pulsed, I could be wrong, might, my general engineering education ended 20 years ago, so I would want to look things up again! Psycho Warren might have a verifiable answer. - He seems to have a lot of knowledge!
Also there is the issue of load is the flow rate constant throughout the stroke of the engine? again I won't know enough to answer this. and it need to be verified! this will cause the pressure to flutter!
I use a accu-sump fpr completely different reasons (to prevent oil starvation in as wet sump), but I can say it irons out most of the variations except at start- up! (engine start procedure is modified to counter)
the pump uses a 4 toothed wheel in a 5 slotted recess, I would have thought the output would be constant not pulsed, I could be wrong, might, my general engineering education ended 20 years ago, so I would want to look things up again! Psycho Warren might have a verifiable answer. - He seems to have a lot of knowledge!
Also there is the issue of load is the flow rate constant throughout the stroke of the engine? again I won't know enough to answer this. and it need to be verified! this will cause the pressure to flutter!
I use a accu-sump fpr completely different reasons (to prevent oil starvation in as wet sump), but I can say it irons out most of the variations except at start- up! (engine start procedure is modified to counter)
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