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Accusump and Accusump Accessories Available for purchase in the LN Engineering Online Store Tracking your Porsche? Running R-compound or racing slicks? Then maybe a deep sump is not enough to prevent the dreaded oil starvation problem inherent to the M96. The Accusump is the answer to ensure adequate oiling in most driving situations. The Accusump is the original automotive oil accumulator. It is a cylinder shaped aluminum storage container that acts as a reservoir of pressurized oil, to be released when there is a drop in the oil pressure. The Accusump is connected to the pressure side of an engine's oiling system and is charged by the engines own oil pump. Its simple, efficient design revolves around a hydraulic piston separating an air pre-charge side and an oil reservoir side. On the oil side of the Accusump it has an outlet that goes into the engine's oiling system, controlled by a valve. On the air side it's equipped with a pressure gauge(on oil accumulators only) and a schrader air valve, which allows you to add a pre-charge of air pressure to the Accusump. The 2 Quart Accusump is ideally sized for surge control as well as engine pre-oiling and is a compact 12" long by 4 1/14" in diameter. We've chosen this size because of the balance between it's footprint and volume and should be good for most installations. Oil accumulators deliver oil to the engine before starting to eliminate dry start scuffing (pre-oiling) and discharges oil during low oil pressure surges to protect against engine damage during demanding racing conditions. Accusumps Oil Accumulators are designed collect pressurized oil from your engine and store it so it may be discharged later. At the time the engine is shut off and the Accusump valve closes any oil pressure in the Accusump is held there. On engine start-up when the valve on the oil side is opened the pressurized oil is released into the engine and therefore pre-lubricates the engine prior to start-up. After the engine is started and the oil pump has taken over, oil is pumped back into the Accusump. This moves the piston back and pressurizes the Accusump until it equalizes with engine's oil pressure. The Electric Pressure Control Valve we use is for a discharge/refill of 35-40 PSI. These valves have the convenience of an electric valve for remote mounted units on daily drivers but with the rapid refill rate of a manual valve as required in racing. The E.P.C. valving will only allow the Accusump to discharge oil when the engine’s oil pressure drops below a predetermined level and only refill when the pressure rises above that level. For a dedicated track car or for best performance, a manual valve is recommended, but isn't as clean and streamlined as the E.P.C. valving for a street setup. With the electronic valve, you don’t know it’s working as it’s supposed to be seamless – but I’d recommend addition of a shift light or some other indicator to tell you that the accusump is actually actuating. We suggest adding a toggle to have a “valet” mode so that you can turn the accusump off, as we normally recommend wiring the E.P.C. valve to actuate at key-on. Alternatively, you can relay it so that it only is operating when the fuel pump is going, negating the need for a “valet” mode. Alternatively, a manual valve is the sure fire way to know the system is working. You start the engine, switch the manual valve, drive, then shut off the valve prior to turning the engine off. While driving, if the engine's oil pressure is interrupted for any reason, the Accusump releases its oil reserve again, keeping the engine lubricated until the engine's oil pressure comes back to normal. This release of oil could last from 15 to 60 seconds, depending on the size and speed of the engine. In racing or hard driving conditions, the Accusump will automatically fill and discharge when needed as you corner, accelerate and brake. What is the story behind oil starvation with the M96/M97 engine? Why does the Accusump work? The Accusump solves the problem in as much as it provides a steady stream of pressurized oil when oil starvation occurs. It can only provide however much oil it stores, then the problem will continue, but for most situations, a 2 quart unit will suffice. Some tracks require a 3 quart unit. Accusumps have been used for decades in other wet sump applications to prevent oil starvation – more specifically, Porsche 356s and 944s (and other variants) use them successfully to stave off starvation. Depending on your driving ability, a deep sump may suffice. I’ve been told that our deep sump is worth about ˝ bar of additional pressure in the carousel at Road America, but that’s on PS2s. Stickier tires will make the problem worse, as do other modifications to the car, which allow for greater G’s. The Mantis Racing or Autofarm deep sump are probably the best track-only bolt-on solution in that it provides 2 quart extra capacity and an additional oil baffle, but due to ground clearance, I wouldn’t use it on the street. The idea here is that you have a lot of extra oil in the sump. Although there are many theories as to why there is oil starvation, the two that hold most credence are that the scavenge pumps and associated oil return passages (and defoamers) cannot return and process the oil fast enough AND the second theory that the oil collects in the heads under high G-forces. Together, both a deep sump and Accusump are an attempt to control the symptom (low oil pressure) by providing extra oil. The X51 oil pan in our opinion (and likewise the opinion of many others) is useless without the rest of the X51 package, which added an extra scavenge pump in the head and external oil return line right back to the sump. The addition of the extra scavenging in the head seems to be the fix for the problem with revised baffling and/or a deep sump kit. For those of us without a factory X51 engine with this provision, the TTP Oil Safe system is one solution mimicking what Porsche’s system did to fix the problem. Interesting enough, this is what Porsche did with the new DFI engines found in MY09 and later cars, which added one extra scavenge pump per head to further bolster the performance of Porsche’s “Integrated Dry Sump.” LN Engineering plans on offering a deep sump for the DFI cars in the near future as well as an alternative scavenging system for the M96/M97 engine for MY97-08 vehicles. We offer two universal kits with everything you need to do a custom Accusump installation in your Boxster, Cayman, or 911. We also recommend running our deep sump kit (sold separately). Adding an Accusump is now easy with using our billet spin on oil filter adapter in conjunction with available adapters from LN Engineering.
HPDE installation is easy (shown above), using one single line coupled with a single input adapter (shown above). A "shorty" filter is used to maintain ground clearance for street use. We recommend changing the short filter after every track event. On the track, a longer filter can be used where ground clearance isn't as big an issue. NOTE: THE HPDE INSTALLTION REQUIRE USE OF A VERY SMALL OIL FILTER THAT MUST BE CHANGED AT MAX INTERVAL OF 1200 MI OR 10 HOURS OPERATION!
2010 Pricing Schedule
RACE- Two Quart Marine Accusump system including LN Engineering spin on oil filter adapter, remote oil filter adapter, Canton Mecca remote canister oil filter (below), 45 psi electronic valve, T adapter for accusump, stainless braided hose, and fittings. $1399 including free shipping in the continental 48-states. OR HPDE - Two Quart Marine Accusump system including LN Engineering spin on oil filter adapter, single input sandwich adapter (for easy one-line installation - fits between filter and LN spin on filter adapter), spin-on filter, 45 psi electronic valve, stainless braided hose, and fittings. $1029 including free shipping in the continental 48-states. Installation shown above in Boxster. Manual valves available upon request for best performance. Complete LN Engineering product and price listing available here in pdf format. As a leader in the Porsche community, LN Engineering's focus on quality, service, and support is evident, and begins with you. Let us help you succeed. Contact us at 815-472-2939 or
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