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Old 06-30-2008, 12:41 AM   #1
hotrod
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Default G force simulation of oil control

For those that think oil return is not a big issue on a flat engine, here is an interesting video that shows how Porsche simulated track G forces on a test rig.

It is easy to understand what the oil must be doing inside the engine as you watch the simulation.


http://www.autoblog.com/2008/06/27/v...ing-virtually/

Larry
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Old 06-30-2008, 11:31 AM   #2
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Great video. I couldn't read the gauges but it sounds like maybe 7500. This shows the R&D the big guys come up with. I don't think I can fathom a dry sump that will take those angles and Gs without sucking air. That shows why you need a good air seperator and tank.

Last edited by charliew; 06-30-2008 at 12:23 PM.
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Old 06-30-2008, 01:07 PM   #3
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Very cool video.
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Old 06-30-2008, 07:12 PM   #4
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Quote:
Originally Posted by charliew View Post
Great video. I couldn't read the gauges but it sounds like maybe 7500. This shows the R&D the big guys come up with. I don't think I can fathom a dry sump that will take those angles and Gs without sucking air. That shows why you need a good air seperator and tank.
Do you mean wet sump? That's the type of conditions dry sump systems were designed for.
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Old 06-30-2008, 08:58 PM   #5
hotrod
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A dry sump pulls a vacuum on the oil pan and pumps the oil and air into a holding tank where it has a chance to become de-aerated, then it pumps clean oil back to the engine.

They use several suction pump stages pulling oil from multiple locations in the engine and taking it all back to the surge tank.

Larry
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Old 07-01-2008, 10:08 AM   #6
charliew
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I meant mostly air.
My sportster is dry sump. When I hotrodded it if you kept the rpms up around 5k or more the rocker box area would fill up with oil and go out the breather and get all in the air filter and then run down the side of the bike. A Pro One (I think) pump with a bigger scavenge side pump fixed it. It seems that everything that is hotrodded needs oil system upgrades. That pump cost 500.00 but it was worth it.
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Old 07-01-2008, 10:45 AM   #7
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H-D sportster? Dry sump? Dang, I know nothing about those bikes exept they have what, like three seperate oil systems or something. I'd like to rebuild one someday just to see what's going on in there.
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Old 07-01-2008, 11:41 AM   #8
modaddict
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that was a pretty cool video.

thanks larry.
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Old 07-01-2008, 06:33 PM   #9
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That engine sounds absolutely incredible!
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Old 07-02-2008, 02:08 AM   #10
Patrick Olsen
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That's pretty cool stuff. Thanks for sharing, Larry!
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Old 07-02-2008, 11:07 AM   #11
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They are limited to 1g but cool stuff.
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Old 07-02-2008, 03:38 PM   #12
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It looks like an amusement ride. Does not look like a cheap rig either.
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Old 07-02-2008, 04:07 PM   #13
hotrod
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Quote:
They are limited to 1g but cool stuff.
Not really, the absolute G force is limited to one G, but the effective G force is any G you care to use. A 45 degree tilt will will have the same effect on the oil as a 1 G cornering load in the real world, a 63 degree tilt the same effect as a 2 G load in the real world. A 90 degree tilt would be equal to an infinite G load.

The force vector is trying to simulate a situation which has 1 vertical G at all times plus a lateral, G load (cornering, acceleration or braking). In the sim when they increase the tilt they simultaneously increase the lateral load and reduce the G load along the engines physical vertical axis so except for inertial loads like toping a hill at speed and going weightless they can come very close to duplicating the effective force vector the engine sees in the real world.

Larry
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