I WAS TRAVELING ON THE TOLL WAY AND WENT TO PASS A VEHICLE GOING BELOW THE SPEED LIMIT. UPON ACCELERATION (APPROX 53 MPH), I HEARD A MUFFLED POP IN THE ENGINE COMPARTMENT AND WHITE SMOKE TRAILED THE VEHICLE. NO WARNING LIGHTS WENT OFF PRIOR AND I DO NOT RECALL SEEING ANY AFTER THE "POP". I STOPPED THE VEHICLE AND TURNED OFF THE ENGINE, OPENED THE HOOD TO FIND FLAMES UNDER THE ENGINE IN VICINITY OF THE OIL PAN. I WAS UNABLE TO PUT OUT THE FLAMES AND THE FIRE CONSUMED THE VEHICLE. I VEHICLE WAS WELL MAINTAINED AND HAVE NO IDEA WHAT THE ORIGIN OF THE FIRE WAS.