"The Wright R-3350 was renowned not only for its power,but also for the high incidence of engine fires.1 In fact, an in-flight fire that originated in the engines had caused the loss
of one of the two XB-29 prototypes and its entire crew.2 Onefifth of all B-29 accidents between February 1943 and July 1945 were caused by engine fires. Once a fire started in an
engine, it was very difficult to put out; the carbon dioxide fire extinguisher system was inefficient, and several engine components
were made of highly flammable magnesium. Engine fires were the biggest fear of B-29 crews.[3]"
осталось понять как конкретно он собственно горит.