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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHBest Deep sump kit??
Leading reported evidence
Use with the old style swirl pots
Performed · outcome unconfirmed
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Performed · outcome unconfirmed
The Mantis Sump uses the 997 style discharge tubes, it can also be used with the old style swirl pots.
Leading evidence: 'Use with the old style swirl pots' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'best available at the moment' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Recommend deep sump kit' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I am looking to see what is recommended for a deep sump kit for my 99 996 MKI.
Replace oil and fills only the regular amount of oil
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Suggestion
Remember to mark the oil filler area with a note about the extra capacity otherwise when someone changes the oil and fills only the regular amount of oil....................
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
The Mantis Sump uses the 997 style discharge tubes, it can also be used with the old style swirl pots.
Replace oil and fills only the regular amount of oil
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion
Remember to mark the oil filler area with a note about the extra capacity otherwise when someone changes the oil and fills only the regular amount of oil....................
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
18 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T205155Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have the Bilt/LN Engineering deep sump. It appears about the same as the Mantis setup except the Bilt version includes the EBS Racing metal X51 baffle. It also comes with 997 return tubes which get the oil back to the sump faster than the stock cylinder type returns do. I plan to install a skid plate this winter, it does hang lower and I drive my car to and from the track.
Remember to mark the oil filler area with a note about the extra capacity otherwise when someone changes the oil and fills only the regular amount of oil....................
Check how ddurable the 'window flaps' in the new pan are. The ones with robust s/s hinges and heavy gauge flaps are less likely to warp/bind ? If these flaps leak ,they are somewhat useless.
To me the Mantis kit looks seriously inferior to the LNE / Bilt racing deep sump kit. Looking at the photos the Mantis does not improve keeping the oil around the pickup, it looks like it just deepens the sump, but oil can still slosh side to side. It also retains the 996 oil return tubes which slow the return of oil to the sump because of the swirl pots. These swirl pots were supposed to reduce oil foaming but they were found to be unnecessary so they were deleted on the 997.
With the LNE kit you get the EBS Racing metal door X51 baffle which is also much better than the factory X51 with rubber doors. Additionally there is a cover over the deep sump with a controlled opening that only allows oil to enter/exit thru the baffle, not past the sides of the baffle as it appears the Mantis kit will allow....sort of rendering the baffle pointless.
For about the same price the LNE / Bilt version looks much better.
https://lnengineering.com/2qt-deep-s...51-baffle.html
Just to clarify a few points, the Mantis Deep Sump has been developed since 2006. The Mantis Sump has dams built in the sump to direct oil to the oil pick up. The Mantis Sump uses the 997 style discharge tubes, it can also be used with the old style swirl pots. We feel that rubber flaps seal better and don't not LEAK like the steel doors on the X51 setup. Mantis has purchased all of the other setups to evaluate them. Also the position of the windage prevents oil sloshing up the sides of the block, X51 set up does not. Mantis is the only manufacture that has published oil pressure data while racing. The Mantis Sumps, two sizes, have the lowest profile with the largest capacity. The 1.2 L sump is as slim as most .5L setups, and still has a windage tray and oil baffles built in.
I have seen a similar deep sump kit with rubber flaps in the far right and left side of the windage tray in order to allow oil to flow down to the space under the tray but preventing it to flow out. Any idea on the benefits for this design alteration?
0.5 L extensions are a joke
1.2L pan is better than oem, and is nicely low profile- you will only occasionally scrape it, but at least it has a thick bottom end so it doesn�t really need a skid plate. but oil pressure still fluctuates even on the street.
2 L deep sump extensions - make your pan sit too low for our Midwest roads, and even for New York City road construction (eg., heavy steel plates on the road raining at night when you can�t see anything and in busy traffic and tired). Can get a skid plate for them though. Probably the best available at the moment.
