Two stroke Aircraft engine oils - there is a difference!
Ultralight Aircraft pilots flying on two stroke engines should be aware that their are different oil recommendations for the two different styles of Rotax two stroke engines used in aircraft application.
There is one OIL FOR AIR-COOLED ENGINES.
Air cooled engines run hotter than water cooled outboard-type engines and require a lubricant formulated for their unique lubrication requirements.
Outboard oils have a lower flashing point and tend to burn up early in air-cooled engines, causing carbonization and eventual ring sticking.
Because of this, BIA, TC-W and TC-WII oils can promote the formation of deposits.
Rotax recommends the use of a 2-cycle oil for air cooled engines as the optimum oil in most of their owner's manuals (all but the 618).
This includes the 277/377/447/ 503 air cooled engines PLUS the 532 and 582 liquid cooled engines.
These liquid cooled engines run the same high internal temperatures as the air-cooled smaller engines and require the same high-temperature type of oil.
ATTENTION
These oils are NOT compatible with TC-W or TC-WII lubricants.
DO NOT MIX THE TWO DIFFERENT OILS IN YOUR SYSTEM OR GELLING MIGHT OCCUR.
Follow manufacturer's recommendation for mixing ratios. For the 618 Rotax aircraft engine two stroke Water cooled engine oil is recommended sue to the cooler internal temperatures. With a lower flash point, this oil is perfect for engines such as the 618 which run similar temperatures to those of an outboard type engine.
ATTENTION - There are also two different formulations one for pre mix and one for oil injection!
http://www.ultralightnews.com/enginetro ... /oiltr.htm
