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This is huge. I had no idea. So with the 55 dipstick on my 2004, at half, I'm running at the low hash on the original recommended 54 dipstick?
Am I correct that originally, running at half was recommended because otherwise the car would burn oil and smoke, due to oil being oulled through the AOS into the intake. That also risks hydrolock (well, oil-lock).
So, with the UAOS, we should be able to run full, as oil will be captured in the reservoir. However, without the new drainback, it may fill quickly. Correct?
Last, how does the UAOS drainback affect crankcase pressure? I thought the AOS diaphragm maintained the difference between intake and crankcase. But with the drainback, they are now direcly connected. Is that an issue? I'm not in any way saying I think it is, I only know enough to ask the question.
All you assumptions are correct..
The crankcase pressure is not effected by the Track Drain-back, due to the relocation of the flow diaphragm is on the intake side of the Accumulator. The original AOS Cyclone, the piping, the Accumulator and the Track Drain-back are all connected and see the same pressures/vacuum as does all the crankcase. This makes a robust system that can handle/return/separate more oil from the crankcase vent system and is still emission compliant with safety features. Not using this system is just being satisfied with a "sub-par system" that is more costly in the long run..
Got it. Thanks!
I didn't think about where the diaphragm was now compared to the reservoir.
Hmm, I just installed the UAOS, and a new oil fill tube, before you released the drainback.I probably will run more oil now (3/4 to full?) I don't track the car, but I have a weakness knowing that there is a better, inexpensive solution out there that I could install... Do I really want to take things back apart?
Got it. Thanks!
I didn't think about where the diaphragm was now compared to the reservoir.
Hmm, I just installed the UAOS, and a new oil fill tube, before you released the drainback.I probably will run more oil now (3/4 to full?) I don't track the car, but I have a weakness knowing that there is a better, inexpensive solution out there that I could install... Do I really want to take things back apart?
Yes, it depends on the amount of blow-by you are producing (eg. high mileage or Extreme Track Duty ect).
The original intention of the UAOS was to be for normal car usage , the Accumulator is to be checked/drained at oil change service. On most all cars used in a normal manner there will be little to no accumulation in the Accumulator.in a 3-5k mile interval. With the increased safety factor and ease of maintenance/cost being the main focus.
But the versatility of the system and the advancements UAOS have lead to a greater performance and the ability to increase oil levels beyond what was previously recommended by other professionals and by Porsche, and this leads to even greater safety and more stabil oil pressures .
Last edited by Porschetech3; 07-31-2021 at 08:16 PM.
You got the right idea, but instead of cutting and plugging 12 an 20, just remove them and install Nitrile or NBR rubber caps and clamps on the nipples. I will source the proper sizes/types today and let you know. I will start including them the in the UAOS kits.( and revise the Install instructions)
Yes just cap the tube nipples on the AOS housing, clamps wont be necessary and plain rubber vacuum caps will be OK.( would actually be ok to leave open but wouldn't look completed or Professional)
Correct, a new #4 if yours is original, #5 and #10 come with the UAOS kit.
I ordered a new #4 hose and it has 2 bolts to attach. Current hose in my car has one, like the picture above.
no idea why it’s different. The hose connects to crankcase vent valve, 99610704751
‘03 C4S, 6spd
de is getting closer may not be ready if I can’t get the hose. Part # would help. I ordered from FCP and verified parts fitment.
I'm a 3 day newbie to the 996 community with a brand new to me 2000 996 Cab w/ Tip at 32K miles on the clock. I've been reading up on the AOS, etc, and am at loss to whether or not my car NEEDS this upgrade. It's never tracked, but I do some "spirited driving" on occasion. If the UAOS is simply a better system, then I'm game. I've scheduled the IMSB replacement (LN Solution) which I BELIEVE requires the entire engine & automatic tranny removal. If so, there's no time like the present to get the UAOS installed. Having said that, my mechanic is asking if the part comes with written instructions? Damn good question as I don't want to pay him an hourly rate to learn how to install an aftermarket part. Any help would be GREATLY appreciated. Thanks!!
I'm a 3 day newbie to the 996 community with a brand new to me 2000 996 Cab w/ Tip at 32K miles on the clock. I've been reading up on the AOS, etc, and am at loss to whether or not my car NEEDS this upgrade. It's never tracked, but I do some "spirited driving" on occasion. If the UAOS is simply a better system, then I'm game. I've scheduled the IMSB replacement (LN Solution) which I BELIEVE requires the entire engine & automatic tranny removal. If so, there's no time like the present to get the UAOS installed. Having said that, my mechanic is asking if the part comes with written instructions? Damn good question as I don't want to pay him an hourly rate to learn how to install an aftermarket part. Any help would be GREATLY appreciated. Thanks!!
Yes, the UAOS is a better system all the way around, and is even less costly in the long run.
Doing it while the engine/trans is out is the perfect time. Yes it has written instructions that come with it. ( although the install is very straightforward for a Tech)
With 32K miles and no plans to track the car, you will not need the "high mileage/Extreme Track Duty Auto Drain" kit that is an optional . The schedual service is to check/drain the Accumulator at the regular oil changes 3-5k miles. On street driven engines that are not high mileage, there will be very little to no accumulation of oil in the Accumulator in the 3-5k miles service interval.
I ordered a new #4 hose and it has 2 bolts to attach. Current hose in my car has one, like the picture above.
no idea why it’s different. The hose connects to crankcase vent valve, 99610704751
‘03 C4S, 6spd
de is getting closer may not be ready if I can’t get the hose. Part # would help. I ordered from FCP and verified parts fitment.
If have an engine before # 663 09950 you will need hose # 996-107-147-55 and connector 996-107-047-51 , it has only 1 mounting hole.
Are you running the UAOS? If you are doing a DE you really should be...you can run the oil at full mark with the Extreme Track Duty Auto Drain kit.
Last edited by Porschetech3; 08-03-2021 at 09:34 PM.
07-31-2021, 04:25 PM
