Is oil a liquid or a soled when the engine is running? Or is it something in the middle? The reason I ask is the engine in my A4 does not have a baffle. So I think I need to add one. If oil in the engine is liquid then can I use a sponge in the engine like they do in the fuel tank? Also what is a safe way to measure the oil volume moved buy the pump?
Oil is an incompressible fluid.
It is a liquid at all temps down to about -65C.
Sponges aren't a logical choice for two reasons; 1) the thickness of the oil wouldn't flow fast enough through the sponge. Oil pumps move a much larger volume of fluid than fuel pumps do, and 2) I can't think of any sponge that would survive the heat and violent atmosphere of the crankcase.
Adding a baffle is not required by any means. If you are using the car in a manner that is causing oil starvation and oil pressure drops, then it may be a good idea. Otherwise, drive it.
If it is a V6, then it has a pretty decent alloy oil pan that has a baffle built into it.
They are also prone to cracking from hitting parking stops.
If you aren't tracking/Auto-xing on a stiff suspension and slicks, I can't imagine it being a problem.
In reply to turboswede:
:( not a v6 :(
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Technically, not an engine either. 
The 1.8t has a full length windage tray that has some rudimentary trapdoors in it as well. It acts as baffling once installed.
Replace the oil pickup. I haven't seen one yet that wasn't clogged.
Didn't the 1.8T have a reputation for sludge issues if the oil wasn't changed frequently enough?
In reply to SlickDizzy:
Yes. So in this case the oil may have been acting like a solid. 
Okay, so what you guys are saying is.
From an engineering stand point, I can use a sponge still baffling in the oil pan? Like what you see in a fuel tank.
Did he mean "can't." Or did he not understand what was said.
In reply to z31maniac: That is just what I plan to do with it.
It has KW's coil overs and harsh springs.
In reply to curtis73:
My fuels and lubes class in college would beg to differ with that -65C temperature. I saw 10-30 Tech2000 turned into a waxy solid around 0F. 0-30 Mobile 1 was still pouring, very slowly, at about -40F/C which was as cold as we were able to get using dry ice and crockery.
That Mobil 1 also had the highest temperature of any of the oils we had around before it would outgas enough to flash when presented with an open flame. It was my stuff that I used in my turbocharged Mazda.
I think engine oil is compressible, but at pressures no one here would need to worry about. I'm talking less than one percent per thousand PSI. I couldn't find good information quickly on engine oil but I did find this on water;
http://en.wikipedia.org/wiki/Properties_of_water#Compressibility
GVX19 wrote: Okay, so what you guys are saying is. From an engineering stand point, I can use a sponge still baffling in the oil pan? Like what you see in a fuel tank.
I think you are going to end up doing some serious damage if you actually intend to do that.
GVX19 wrote: Okay, so what you guys are saying is. From an engineering stand point, I can use a sponge still baffling in the oil pan? Like what you see in a fuel tank.
NOPE! DON'T DO IT! See Curtis' reply below:
As was described in another post, the 1.8T already has a baffled oil pan from the factory. Replace the oil pickup with a new one, put it back together properly and get on with it already.
curtis73 wrote: It is a liquid at all temps down to about -65C. Sponges aren't a logical choice for two reasons; 1) the thickness of the oil wouldn't flow fast enough through the sponge. Oil pumps move a much larger volume of fluid than fuel pumps do, and 2) I can't think of any sponge that would survive the heat and violent atmosphere of the crankcase. Adding a baffle is not required by any means. If you are using the car in a manner that is causing oil starvation and oil pressure drops, then it may be a good idea. Otherwise, drive it.
pres589 wrote: In reply to curtis73: My fuels and lubes class in college would beg to differ with that -65C temperature. I saw 10-30 Tech2000 turned into a waxy solid around 0F. 0-30 Mobile 1 was still pouring, very slowly, at about -40F/C which was as cold as we were able to get using dry ice and crockery.
Exactly... still pouring. That's still liquid. Its freezing point (where it becomes a solid) is about -65. ... of course that is highly variable based on additives, etc.
DO NOT - I will repeat - DO NOT put a sponge in your oil pan and expect good things to happen.
Okay, I understand no sponge. How about coarse wire mesh, think steel wool with much larger strands and much coarser mesh, say 1/4" openings? I've seen something similar used in valve covers as an oil/vapor separator.
thits hread is dumb.
In reply to Curmudgeon:
That is what I'm thinking of doing. I just did not know what state oil would be in at 7k rpm. I also need to find out what the flow rate is so I can judge oil volume correction. It looks like Ill have to just try it and report my findings
belteshazzar wrote: thits hread is dumb.
^ this, but subscribing to see how quick the engine seizes.
Flow rate should be about the same at whatever PSI. Oil requirements don't change very much with engine speed, so once you get to regulator pressure, all extra volume is just dumped back into the pan... or into the pump inlet, depending on the design. Redirecting to the pump inlet makes the oil hotter but it reduces certain losses.
This guy really, really wants to stick something in his oil pan.
Whatever the outcome, it'll be a learning experience for him...and fun for the rest of us. Win-win.
LanEvo wrote: This guy really, really wants to stick something in his oil pan.
From what I've seen lately, people seem reluctant to install OIL in the oil pan.
I've found that putting oil in the oil pan greatly helps engine performance and longevity. More people should try it.
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