Dipstick
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Tourer
Joined: Oct 2009
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From: Bixby Oklahoma
Dipstick
Do the dipsticks with the digital temp gauge have a vent? I pulled in this morning and the pressure was pegged at 60!! As I backed into my spot, I kind of shook it from side to side and the needle wavered a little as well. I took the cap off and back on and started her back up and the pressure was back to about 32...........what up
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From: Phoenix '53, '88, '09 Big Twins
you may be overfull on the oil level.
sometimes the pressure in an overfull oil tank will push the dipstick up and out ( maybe gone too) covering the side of the bike with oil ( I and many others run a pint low, helps with breather blow by as well)
and pressure will show higher reading if the oil is cold
any of these make sense to you?
Mike
sometimes the pressure in an overfull oil tank will push the dipstick up and out ( maybe gone too) covering the side of the bike with oil ( I and many others run a pint low, helps with breather blow by as well)
and pressure will show higher reading if the oil is cold
any of these make sense to you?
Mike
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Tourer
Joined: Oct 2009
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From: Bixby Oklahoma
It does make sense, I have dealt with oil from the AC for some time and was running a little low for that. I did just install an oil cooler yesterday and when I filled the crankcase I stopped at one mark below full, trying to take into account the extra capacity of the cooler. It was fine for the thirty miles to work and it spiked just as I got to the parking lot. I had a little over a hundred miles yesterday after the install and didn't notice anything.
By the way, the blow by seems to be fixed. Was running an S&S 106 kit and discovered the ring land was of a bad design and rotated on the pistons and eventually got into the cylinder wall and a little of the piston below the ring. Long story shory, dealer rebuilt the top end (103 this time) and so far so good.
As an aside, it was the second time the ring thing got me, and the first time a differnt dealer fixed it and the second time it was apart, they found the head gaskets didin't match. One hole was about 60 thousandths smaller than the other. Maybe one for the stock head and one for the SE head I guess. The pressure does fluctuate at idle but rarely goes over the standard 32 or so, so the 60 psi kind of got my attention.
kt
By the way, the blow by seems to be fixed. Was running an S&S 106 kit and discovered the ring land was of a bad design and rotated on the pistons and eventually got into the cylinder wall and a little of the piston below the ring. Long story shory, dealer rebuilt the top end (103 this time) and so far so good.
As an aside, it was the second time the ring thing got me, and the first time a differnt dealer fixed it and the second time it was apart, they found the head gaskets didin't match. One hole was about 60 thousandths smaller than the other. Maybe one for the stock head and one for the SE head I guess. The pressure does fluctuate at idle but rarely goes over the standard 32 or so, so the 60 psi kind of got my attention.
kt
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Joined: Nov 2010
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From: Simi Valley, CA
Your oil pressure gauge is malfunctioning.
Even if you remove the dipstick with the engine running it will not affect the oil pressure.
Were talking two completely different animals here. Crankcase pressure and oil pressure. The two are not at all related and have no effect on each other.
Crankcase pressure, which a vent in the dipstick would have some effect on if there was one (but there is not), is a by-product of combustion chamber pressure finding its way to the crankcase, e.g., piston ring blow-by.
Oil pressure on the other hand, is a hydraulic effect created by the oil pump to circulate the oil through the engine.
EDIT: After thinking about this a little more, I realized that my original post isn't completely correct. It's true that under normal circumstances oil pressure and crankcase pressure are unrelated, but under extreme and abnormal conditions such as a restricted crankcase ventilation system, there could be some crosstalk. If the crankcase pressures are higher than the oil pressure then the crankcase pressure could find its way into the oil circuit and raise the oil pressure accordingly. Sorry for the misinformation.
Even if you remove the dipstick with the engine running it will not affect the oil pressure.
Were talking two completely different animals here. Crankcase pressure and oil pressure. The two are not at all related and have no effect on each other.
Crankcase pressure, which a vent in the dipstick would have some effect on if there was one (but there is not), is a by-product of combustion chamber pressure finding its way to the crankcase, e.g., piston ring blow-by.
Oil pressure on the other hand, is a hydraulic effect created by the oil pump to circulate the oil through the engine.
EDIT: After thinking about this a little more, I realized that my original post isn't completely correct. It's true that under normal circumstances oil pressure and crankcase pressure are unrelated, but under extreme and abnormal conditions such as a restricted crankcase ventilation system, there could be some crosstalk. If the crankcase pressures are higher than the oil pressure then the crankcase pressure could find its way into the oil circuit and raise the oil pressure accordingly. Sorry for the misinformation.
Last edited by 2black1s; Feb 22, 2011 at 10:12 AM. Reason: Technical Clarification
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