Edema has many possible causes: 1  Prolonged standing or sitting, especially in hot weather, can cause excess fluid to accumulate in the feet, ankles and lower legs. 2  Tiny valves inside the veins of the legs can become weakened, causing a common problem called venous insufficiency.
Cars with nitrous-equipped engines can be identified by the purge of the delivery system that most drivers perform prior to reaching the starting line. A separate electrically operated valve is used to release air and gaseous nitrous oxide trapped in the delivery system.
Updated September 16, 2016. Proper nitro engine break-in is critical for the long-lasting performance of your RC. Every new nitro engine should undergo a break-in procedure which takes from one to two hours and about three to five tanks of nitro fuel. Be patient!