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Originally Posted by Schurkey
1. How can adding oil decrease the pressure? What in a combustion chamber leaks MORE when oiled?
2. The FAA does not suggest a "wet" leakdown test where oil is added to the cylinder via the spark plug hole. They do accept an "oiled" re-test that involves running the engine in "CHAPTER 8. ENGINES, FUEL, EXHAUST, AND PROPELLERS; page 8".
http://rgl.faa.gov/Regulatory_and_Gu...apter%2008.pdf
My concern still stands: Does added oil via the spark-plug hole just blow out the ring gaps or other ring leakage points when the cylinder is pressurized? The result would be no difference in "wet" versus "dry" cylinder leakdown testing once the oil has moved down the piston. |
Do it however you want then! Thanks for the FAA info come in handy if I ever work on a airplane.