oil pressure
08-15-2003, 11:23 AM
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oil pressure
I don't get on it much until the oil pressure settles down to normal for a warm engine.
I've noticed when I start up in the morning my oil pressure is around 45psi (roughly) at idle, but after 10 minutes or so of driving, the pressure will drop to around 30-35psi at idle. Is this because the oil is thicker when it's cold and requires more pressure to move it? Then when the oil gets warmed up, it's thinner and flows easier, so I'm seeing lower pressure?
(I'm running an Amsoil dual-bypass setup so keep in mind my pressure numbers are likely lower than some of you running a single filter)
Thanks.
08-15-2003, 03:16 PM
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Re:oil pressure
[quote author=CTD99 link=board=8;threadid=18431;start=0#msg172957 date=1060964585]
The quote above is from a thread in the towing forum... but it got me wondering...
I've noticed when I start up in the morning my oil pressure is around 45psi (roughly) at idle, but after 10 minutes or so of driving, the pressure will drop to around 30-35psi at idle. Is this because the oil is thicker when it's cold and requires more pressure to move it? Then when the oil gets warmed up, it's thinner and flows easier, so I'm seeing lower pressure?
(I'm running an Amsoil dual-bypass setup so keep in mind my pressure numbers are likely lower than some of you running a single filter)
Thanks.
[/quote]
Oil is thick even at 100 degrees F. The oil pump is forcing this thick oil through the filter media, so you have "restricted" flow until the oil becomes thin enough to readily flow through the media. Once the oil reached operating temperature(about 180-200 degree F.) It is pretty thin and has less restriction, So you will get more oil flowing faster with less pressure. (This is a good thing).
The more oil that flows through your engine the better cooling, more contaminantion removal, and better lubrication overall.
I don't get on it much until the oil pressure settles down to normal for a warm engine.
I've noticed when I start up in the morning my oil pressure is around 45psi (roughly) at idle, but after 10 minutes or so of driving, the pressure will drop to around 30-35psi at idle. Is this because the oil is thicker when it's cold and requires more pressure to move it? Then when the oil gets warmed up, it's thinner and flows easier, so I'm seeing lower pressure?
(I'm running an Amsoil dual-bypass setup so keep in mind my pressure numbers are likely lower than some of you running a single filter)
Thanks.
[/quote]
Oil is thick even at 100 degrees F. The oil pump is forcing this thick oil through the filter media, so you have "restricted" flow until the oil becomes thin enough to readily flow through the media. Once the oil reached operating temperature(about 180-200 degree F.) It is pretty thin and has less restriction, So you will get more oil flowing faster with less pressure. (This is a good thing).
The more oil that flows through your engine the better cooling, more contaminantion removal, and better lubrication overall.
08-18-2003, 06:52 PM
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Re:oil pressure
Well here is the real kicker on your oil pressure. What the gauge shows is actually a lot of hooey. It is computer programed to display what DC believes to be an appropriate amount of pressure to satisfy the average customer. Go figure.
Mine does the same thing. Sounds like your gauge is working as DC wants it to.
Mine does the same thing. Sounds like your gauge is working as DC wants it to.
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