Red Bull Racing have not made any firm decision yet on what engine they will use in 2010, team boss Christian Horner has confirmed.

Recent rumours have suggested that the Milton Keynes-based operation may ditch Renault in favour of Mercedes-Benz powerplants next year, but Horner insisted on Friday that whatever they do will be a well considered choice and not a knee-jerk reaction to events in Valencia, where Sebastian Vettel suffered two failures.

Indeed speaking in the official FIA press conference ahead of the Belgian Grand Prix at Spa-Francorchamps on Sunday, Horner added that Renault have done a good job over the last three seasons.

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"Well, it will definitely be a V8!" Horner joked when asked about what will happen and when the team is going to make its mind up about its engine supply for next year.

"We're obviously in a position where, as an independent team, we have a choice of engine. We've been very, very happy with the supply that we've had from Renault for the last three years.

"Any decision that will be made, will be made not on the outcome of a single weekend but based on what we believe offers us the best opportunity of performance and relationship for the future.

"We haven't made any firm decisions yet but we're obviously nearing a time when we need to make a commitment for next year."

So is there a deadline to make that decision?

"Well, Ross [Brawn] only chose his engine in January, so it shows it can be done pretty late," Horner added. "We obviously don't want to wait that long but I would think that within the next couple of weeks we'll hone in on a decision."

Meanwhile Horner was reluctant to draw too many conclusions from practice on Friday, which saw Lewis Hamilton top the times for McLaren and Brawn GP's Jenson Button and Rubens Barrichello down in 17th and 18th.

"It's a lot of sandbagging if they [Brawn GP] are sandbagging. I think that everybody goes about their own business on a Friday. They've obviously been looking at different wing sweeps and so on as I think all teams have been up and down the pit lane. You can't read too much into today, they tend to obviously run quite a bit of fuel and so it will be interesting to see where the performance is tomorrow and on Sunday," Horner continued.

"We're quite happy with the preparation that we've had today [with Mark Webber fourth and Vettel tenth] and there are a few other cars in the mix as well this weekend. Lewis, if you look through the session, looks quick again, Heikki [Kovalainen] looks quick, Kimi [R?ikk?nen] looks quick, so it's going to be an interesting weekend."