986 Boxster, supercharged - AOS failure and oil seepage RWP - 5 years ago |
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Pedro (Weston, FL)
These engines really were not meant to be supercharged or turbo charged.
The OEM compression ratio is 11.5:1 which is too high to charge.
Many have installed catch cans and valves but I haven't heard of one that was satisfied with their solution.
Happy Boxstering,
Pedro
I too suspect crankcase pressure is the culprit grant - 5 years ago |
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RWP
A friend who is not active on the web has a frustrating problem with his 1997 Boxster. The car has about 60,000 miles, Tiptronic, but with an aftermarket supercharger. Car has run beautifully for several years. About 2 years ago the AOS failed and was replaced with a Porsche part along with all AOS hoses. At the time the hoses seeped a little oil, but nothing significant. Now, with less than 1,500 miles added, the AOS has failed once more. His mechanic replaced it once again with a Porsche part, and the oil seepage has continued to occur. The mechanic, who is knowledgeable, is baffled and the owner is frustrated. We have speculated that the supercharger may be creating excessive crankcase pressure, and we might expect this on a 100k + engine. Can anyone shed light on possibilities.
Grasping at straws, if the pressure will continue to cause AOS failures, is there a potential solution in installing a traditional PCV valve and a catch can?