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Hella-buggin'

Can someone explain the Scavenger Pump system

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I have 997.1 S and am trying to understand how the scavenger pump system works. I'm getting oil pressure drops in right handed sweepers and have heard it's due to the way the scavenger pumps return oil to the sump. Left handed sweepers are not an issue. 

Is there one pump per head? 
Is the right side on the rear, left side up front?

What's the purpose of the Bilt LN Engineering Dual Scavenger Pumps?

Why does RPM effect the pressure when combined with G Forces one direction and not the other?

Thanks

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Early oil issues on the 996 occurred on the track in long left hand sweepers when the car was on true race slicks.  That does not include R-888's NT-01's, or street tires as they could not generate enough G-forces to cause starvation.

 

Since you are having a problem with right handers and on street tires, I would say you have an internal oil system issue. 

 

Have you posted over on one of the Racing and DE forums?  These are the guys that may know a lot more on the topic.

 

Good luck with your problem and keep us posted.

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I'm not on slicks but am running pretty sticky tires. AD08R's and can get about 1.2 G's out of them. 

I've thought about the oil circulation issue but if it was a passage or pump issue, why would it only effect 

right turns and not lefts or straights. 

 

I've got a thread going on the RL DE forum but haven't gotten much other than similar tales from others.

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AD08R's are great tires but not in the zip code of slicks.  

 

Have you you dropped the oil pan to make sure everything nice and tight with 'no other obstructions?  

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My tech has dropped the pan and inspected everything to no avail. We did a compression / leakdown test... numbers looked good.

Borescope, looked good. This isn't an uncommon problem. This is why many people get an accusump but I was hoping the deep sump would be enough since so many people told me that with it they had no pressure issues. I'm just kind of reaching my troubleshooting limits here.

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