What are the troubleshoot of wankel engine?

A rotary engine. Used mostly in Mazda cars like the RX-7.

Wankel engine is a type of internal combustion engine which uses a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons

http://auto.howstuffworks.com/rotary-engine.htm this is a pretty good site pretty much explaines everything

yes

Actually, it is used in ships. The advantage to using a rotary engine like the Wankel engine in marine applications is its high RPM, and low maintenance (compared to the average internal combustion...