Ferrari's Felipe Massa topped the timesheets on the second day of testing at Jerez.

Clear skies and temperatures reaching 17 degrees in the morning, gave way to overcast skies and rain in the afternoon, as 16 drivers representing nine teams got to work.

Massa, who was forced to miss Tuesday's session following a bout of flu, joined Kimi Raikkonen as the Italian team continued its preparations for the 2007 season, which gets under way in four weeks. The Finn completed just 48 laps, losing precious track time following a "technical problem", while his Brazilian teammate completed 46 laps.

Second quickest, just 0.147s off the pace, was Robert Kubica in the BMW. As it was the German's first day on this track in the F1.07 he began by working on set-ups. He then did aerodynamic comparisons and systems checks. In addition, Heidfeld tested different brake cooling solutions.

Meanwhile, Kubica worked on set-ups in the morning and then continued with an aerodynamic evaluation. He also compared different mechanical components, completing his programme by doing a number of long-runs.

Heidfeld continues here tomorrow, with Timo Glock taking over from Kubica.

Fernando Alonso and Lewis Hamilton were in action for McLaren, the due concentrating on the assessment of the brakes and power steering.

While the English driver completed 107 laps on the way to posting the third fastest time of the day, the Spaniard lost time following a (momentary) loss of oil pressure, the result of the evaluation programme he was running at the time. The team claims that there was no disruption to Alonso's test plan, and his time (1:20.040) and the fact that he completed 104 laps, appears to bear this out.

Nelson Piquet worked on a set-up programme, while for Ricardo Zonta, his second day of testing with his new team was one of acclimatization. Nonetheless, he began working on a solid technical programme putting mileage on different aero set-ups and completing as many laps as possible.

It was another impressive day for Williams and the FW29, with both drivers finishing in the top eight and only separated by 0.007s.

"Day two for the team saw Nico and Alex concentrate mainly on checking different mechanical and aero set-ups," said Sam Michael. "We also carried
out some brake systems testing and long runs for temperatures and reliability. Car performance and reliability is progressing well as we dial the car into the
latest Bridgestone Potenza tyres."

Ralf Schumacher was back in action for Toyota, joined by Jarno Trulli who got his first taste of the TF107 around Jerez. Both drivers tried out different set-ups and suspension options during a busy morning which saw the pair clock up plenty of laps.

The afternoon started differently though when Schumacher's car stopped on track, causing a red flag while Trulli's needed a small repair which gave him an extended lunch break. Both TF107s were back on track late in the afternoon after a rain shower, gathering more information for the team to work on before the final day of the test tomorrow.

Mark Webber and David Coulthard were present for Red Bull, the Australian suffering a technical problem which resulted in one of three red flag periods.

Jenson Button was joined by Marco Andretti, the American youngster enjoying his second F1 test with the Japanese team. The Englishman completed 100 laps, finishing thirteenth, 1.1s off the pace, while the American, still getting acclimatised to F1, completed 74 laps on his way to posting the fifteenth best time of the day.

Button continued his programme in the new RA107 focusing on aerodynamic evaluations. Meanwhile, Andretti spent the morning acclimatising himself to the car, before going on to complete some data gathering exercises, alongside race start simulations in the afternoon session.

Rubens Barrichello will take over from Button for the final day tomorrow.

With rain forecast for tomorrow, there is a likelihood of some teams sitting out the day and continuing on Friday.

To check out our 2007 test centre, click here