"We grew up together and it's almost like we've come full circle, although on the other side of the world."
The LMP1 category is where teams can really experiment as the rules are not as rigid as in many other categories. As such, the cars are in a constant state of evolution so the 2017 version of the Hybrid 919 will be quite different to the 2015 model in which Bamber won Le Mans.
"I'm really looking forward to going back to Le Mans especially in this category and challenging for a world title as well. It won't be easy, as I've got a lot to learn. The car has got a lot more technical since I last drove it.
"The basics will be the same but the car I'll be testing will have a heap of technical changes. The others have been driving it as it has evolved but, for me, I have no idea what it'll be like.
"It's great to be able to step up again in to LMP1 and even more so to be able to do it full time. It's quite an honour really as they [Porsche] could have picked anyone they wanted," he said.
Bamber has been racing in the United Sportscar Championship in America for the past two years as well as guest events in Europe and Asia. While very happy to get the call to the main game, he will miss the GT category where hehad a lot of success.
"I'm a bit sorry I won't be able to do any more GT racing and moreso that I won't be able to race the new car. We did a lot of development work on that car [911 GT3].
"It would have been nice to drive and race that car," he said.
His co-driver, Hartley, has been a fulltime Porsche LMP1 driver for three years and already has a WEC title to his name as well as a podium finish at Le Mans.
"We're very sad to be losing Mark [Webber] from our crew but, at the same time, it's exciting to welcome Earl to the team," said Hartley.
"We will all have to step up our game with Mark leaving, but we think we are ready for that.
"It's also an incredible story that Earl and I raced karts together from the time we were seven years old and we were close friends during our early motorsport years.
"Nobody could have predicted that we would be teammates in a world championship 20 years later."