Digi944 wrote:
Do bad engine mounts really cause a lot of problems?
They can do, I must state that my fuel rail is a 968 version and the design is sightly worse.
However, worn mounts allow the engine to move more side to side under heavy load, on and off of full throttle gives lots of flex.
The fuel hose will tug slightly on the weak metal of the rail and can cause it to crack.
Very unlikely in a std road car
Another big cause is incorrect balancer shaft timing, look on the American forums and some racers were going through 6 rails a year