The Cox V-4 is currently in work.  The starting point was the HEX-2 with some modifications such as adding two more cylinders.  The carburetor will also have an adjustable venturi for fine tuning. 

From the photo you can see one of the cylinders was modified to accept standard glow plugs.  The engine will be tested using Cox heads and then heads using the standard glow plug.









For those who wonder what the inside of a Cox Glow Head looks like (it was a glow plug that failed as is evident by the glow wire):

Pat. # 7,331,324



Cox V-4