Jenson Button says he is taking heart from the 'positive comments' being made about much vaunted upgraded Honda power unit, despite knowing he will be starting from the back of the grid for the Belgian Grand Prix.

The former champion will get use of a new, updated Honda power unit in his McLaren this weekend, one that the Japanese firm is optimistic will see it challenging for points on a more regular basis, even if it also means both Button and Alonso will be taking penalties in Belgium.

Indeed, though Button says he can never be sure about what to expect, he says he is looking forward to sampling it around Spa-Francorchamps.

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"You don't really know until you drive it," he said. "There's some long straights here as well so we will see but it's always promising when you hear positive comments about the power unit. So I'm looking forward to driving it and hopefully we can see tomorrow how much it's giving us around here. It's obviously a long lap as well, lots of time at full throttle

"It's going to be interesting, we don't know what we're going to achieve this weekend. It's never easy when you start last, but just to see how we are in terms of power, straight line speed, high-speed and low-speed corners with the new aero parts we have, it will be a good test really because this is the biggest upgrade we will have in terms of the power for the rest of the year."

Regarding the penalty that will likely see him starting on the final row of the grid, Button says there is potentially an advantage to be had not being in the mid-field through the La Source hairpin.

"We'll start from the back of the grid but to be fair at Turn 1 here you never really know what's going to happen and we would have been in the mid-pack.

"It can always end in a wheel missing after Turn 1 so starting where we are is not such a bad thing. We might pick up four or five places."