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> Dry sump leakdown prevention?
gnomefabtech
post Mar 25 2024, 11:02 AM
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Hello!

So I'm running a dry-sump system on my 'teen and it's all great except if the car sits for a few days the oil in the tank slowly fills the motor. This wouldn't be a big deal except it floods the turbo and then there's smoke. So much smoke.

Does anyone have experience using a low cracking pressure check valve to hold the oil in the tank until the car is running? I see a selection of these on McMaster but I'm understandably nervous about restricting the flow into the engine from the tank. It's a -12 an line coming out of the tank. What did Porsche do about this on their dry-sump systems?

I'm running a Hayabusa engine (build thread to follow) so it's a pretty unconventional build but the oiling thing is common to all dry-sumps.

Thanks for answering these questions.
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yeahmag
post Mar 27 2024, 10:11 AM
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I use a quarter turn valve at the tank as well.

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stownsen914
post Mar 27 2024, 10:44 AM
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Depending on where the tank is mounted and how the car is used, there is another option. If the tank is front mounted, you can store the car jacked in the rear (or rear tires rolled onto a couple boards to elevate). This puts the engine higher than the tank, and keeps more of the oil in the tank. For frequent use it might be inconvenient, but I've done the above for 911 and 914 racecars and it works like a charm.

I'm not keen on putting something in the oil feed line to my motor. Too easy to forget, or have it fail, and trash the motor almost instantly.
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ClayPerrine
post Mar 27 2024, 03:14 PM
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QUOTE(stownsen914 @ Mar 27 2024, 11:44 AM) *

I'm not keen on putting something in the oil feed line to my motor. Too easy to forget, or have it fail, and trash the motor almost instantly.


(IMG:style_emoticons/default/agree.gif)

I actually tried a Rothsport check valve on my 4.0L motor. It would not allow oil to pass through it. ZERO oil pressure. The guys at Rothsport worked with me and they could not figure out why it didn't work. So I gutted it, and eventually put in a new line without the check valve.

Not trashing Rothsport. They supported it and I will never asked for a refund. But it just didn't work for me, and I can't risk my expensive motor for it.

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Posts in this topic
gnomefabtech   Dry sump leakdown prevention?   Mar 25 2024, 11:02 AM
GregAmy   Edit: /4 or /6? Never mind I have dry sump in my ...   Mar 25 2024, 11:18 AM
gnomefabtech   Thanks for the suggestion. $300 is pretty st...   Mar 25 2024, 09:42 PM
fixer34   Rothsport. Is your engine worth more than $3...   Mar 25 2024, 09:54 PM
mepstein   You might be able to find a used one on pelican. N...   Mar 26 2024, 04:59 AM
mlindner   Rothsport is the way to go. A lot of 911 use them....   Mar 26 2024, 05:24 AM
gnomefabtech   Thanks for the replies. My oil line is a -12 AN s...   Mar 26 2024, 07:02 PM
sixnotfour   I have a rear mounted oil tank and going install a...   Mar 26 2024, 07:21 PM
gnomefabtech   SIXNOTFOUR- I like your resourcefulness there but ...   Mar 26 2024, 07:54 PM
yeahmag   I use a quarter turn valve at the tank as well.   Mar 27 2024, 10:11 AM
stownsen914   Depending on where the tank is mounted and how the...   Mar 27 2024, 10:44 AM
ClayPerrine   I'm not keen on putting something in the oil ...   Mar 27 2024, 03:14 PM
arbitrary   What pressure pump is the Hayabusa engine using? I...   Mar 27 2024, 03:40 PM
gnomefabtech   What pressure pump is the Hayabusa engine using? ...   Mar 27 2024, 06:32 PM
r_towle   Stock 84 3.2 911 here. Why does mine work? Mine i...   Mar 27 2024, 08:04 PM
arbitrary   I have a Hayabusa engine in a Caterham; it uses a ...   Mar 28 2024, 07:46 AM
gnomefabtech   I think it has to do with how good your valve seal...   Mar 28 2024, 10:03 AM
technicalninja   [quote name='arbitrary' post='3136290' date='Mar ...   Mar 28 2024, 01:28 PM
gnomefabtech   https://youtu.be/ZMesefymiTc It's still a wor...   Mar 28 2024, 09:21 PM
gnomefabtech   I solved it. I am using this valve here: https:/...   Apr 5 2024, 12:07 PM


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