diff --git a/VectoCore/Exceptions/VectoExceptions.cs b/VectoCore/Exceptions/VectoExceptions.cs
index 6cc96ea95e658e2f271584f4cb65f0e381257df8..03a3b6fcc2de1a189ee266d17c2221e3b6d631aa 100644
--- a/VectoCore/Exceptions/VectoExceptions.cs
+++ b/VectoCore/Exceptions/VectoExceptions.cs
@@ -21,9 +21,15 @@ namespace TUGraz.VectoCore.Exceptions
 		}
 	}
 
-	class UnsupportedFileVersion : FileIOException
+	class InvalidFileFormatException : FileIOException
 	{
-		public UnsupportedFileVersion(string message) : base(message) { }
-		public UnsupportedFileVersion(string message, Exception inner) : base(message, inner) { }
+		public InvalidFileFormatException(string message) : base(message) { }
+		public InvalidFileFormatException(string message, Exception inner) : base(message) { }
+	}
+
+	class UnsupportedFileVersionException : FileIOException
+	{
+		public UnsupportedFileVersionException(string message) : base(message) { }
+		public UnsupportedFileVersionException(string message, Exception inner) : base(message, inner) { }
 	}
 }
diff --git a/VectoCore/Models/SimulationComponent/Data/CombustionEngineData.cs b/VectoCore/Models/SimulationComponent/Data/CombustionEngineData.cs
index 440d116fafbf2dceb5cb93eb78b08d44708984a8..ad2abdeb9b4301e9129b6781ada10c2b9f60acef 100644
--- a/VectoCore/Models/SimulationComponent/Data/CombustionEngineData.cs
+++ b/VectoCore/Models/SimulationComponent/Data/CombustionEngineData.cs
@@ -57,10 +57,13 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Data
             var results = JsonConvert.DeserializeObject<dynamic>(json);
 
             //todo: handle error when fields not exist
+	        if (results["Header"] == null) {
+		        throw new InvalidFileFormatException("could not find 'Header' Section");
+	        }
             var header = results["Header"];
 
             if (header["FileVersion"] > 2)
-                throw new UnsupportedFileVersion("Unsupported Version of .veng file. Got Version: " + header["FileVersion"]);
+                throw new UnsupportedFileVersionException("Unsupported Version of .veng file. Got Version: " + header["FileVersion"]);
 
             var body = results["Body"];
 
@@ -72,6 +75,8 @@ namespace TUGraz.VectoCore.Models.SimulationComponent.Data
             engine.IdleSpeed = body["IdlingSpeed"];
             engine.Inertia = body["Inertia"];
 
+			// engine.GetType().GetProperty("Inertia").SetValue(engine, body["Inerita"]);
+
             foreach (dynamic loadCurve in body["FullLoadCurves"])
                 engine._fullLoadCurves[loadCurve["Gears"].Value] = FullLoadCurve.ReadFromFile(loadCurve["Path"].Value);