Oil
08-03-2006, 07:03 AM
#21
Join Date: Jul 2002
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Originally Posted by Spuffington,Aug 3 2006, 03:01 PM
with Cheshire Carper
I'm keeping that quote before you change your mind.
I think that is the first and only time I have seen that smilie with those words on the same line, on here, ever.
08-03-2006, 08:13 AM
#24
Registered User
Anything upto about 10mm over the full mark and I wouldn't bother draining the oil out.
As the oil gets higher it starts to hit the crankshaft counterweights and this has several effects. Firstly the added drag on the crank will affect performance slightly. Secondly it'll lift oil up into the crank case and throw it around a bit. This will cool the crank case slightly at the expense of putting that energy into the oil hence raising it's temperature slightly. Thirdly as this oil comes back into the pan it's airated (sp?) which isn't great is it gets pulled through the oil pump.
If you ever cut a hole in the oil pan and put something like perspex in the place the oil in the pan looks a bit like a pint of guiness with the black oil at the bottom and a head of white foam. The crank acts like a whisk. Pour a bad pint of guiness and you get a huge head on it. Same thing happens with the oil you get this head which builds in the engine.
If it's high enough you have all sorts of issues with it not being able to drain back to the sump so going through the combustion chamber (hence degrading the cat) and pressure build up behind seals and the like (possible future oil leaks).
As the oil gets higher it starts to hit the crankshaft counterweights and this has several effects. Firstly the added drag on the crank will affect performance slightly. Secondly it'll lift oil up into the crank case and throw it around a bit. This will cool the crank case slightly at the expense of putting that energy into the oil hence raising it's temperature slightly. Thirdly as this oil comes back into the pan it's airated (sp?) which isn't great is it gets pulled through the oil pump.
If you ever cut a hole in the oil pan and put something like perspex in the place the oil in the pan looks a bit like a pint of guiness with the black oil at the bottom and a head of white foam. The crank acts like a whisk. Pour a bad pint of guiness and you get a huge head on it. Same thing happens with the oil you get this head which builds in the engine.
If it's high enough you have all sorts of issues with it not being able to drain back to the sump so going through the combustion chamber (hence degrading the cat) and pressure build up behind seals and the like (possible future oil leaks).
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