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James Allison has revealed that different engine mapping, a cracked exhaust and a long pit stop were the cause of Nick Heidfeld's Hungarian fire.

(pf1)

Heidfeld was forced to retire from the Hungarian GP when his Renault R31 caught fire after his pit stop. The German parked on the side of the track at the pit lane exit and quickly jumped out.

Marshals arrived at the burning car with fire extinguishers, however, one appeared to be injured when the left side of the car exploded, showering the track with debris.

"As with most accidents, several incidents combined to cause the fire that Nick suffered in Hungary," explained Renault's technical director.

"First of all, we ran a slightly different engine mapping strategy in qualifying, which produced hotter than normal exhausts. We believe that this elevated temperature and caused a preliminary crack in the exhaust pipe.

"We presume that the crack then propagated during the laps to the pit stop - this was not evident to us as we believe that the failure occurred upstream of the place where we have a temperature sensor. We believe that Nick then came in with a partially failed exhaust.

"This pit stop took longer than normal, the engine was left at high rpm for 6.3 sec, waiting for the tyre change to be completed.

"Under these conditions, a lot of excess fuel always ends up in the exhausts and their temperature rises at around 100°C/sec. This temperature rise was enough to finish off the partially failed pipe and to start a moderate fire under the bodywork."

As for the explosion, Allison said that "this was caused by the air bottle which supplies the air valves in the engine. It has overheated in the fire and failed."

The team has already spoken with the FIA about their findings with Allison saying they are doing everything to ensure there won't be a repeat of the incident.

"The incident was highly undesirable, as it has caused us to write off a chassis.

"We will take steps prior to the next race to reduce the likelihood of a further fire and to ensure that the air bottle cannot overheat.

"We are in touch with the FIA both to provide them with a full report of the incident and also to explain to them the actions we are taking to prevent a re-occurrence."

Mercedes GP are reportedly keen on signing former Ferrari technical director Aldo Costa as part of a 'profound restructuring of the team.

After a disappointing start to the Championship for Ferrari, Costa, who had been their technical director for just over three years, was replaced by Pat Fry.

And although the Scuderia said at the time that Costa would remain in an undefined position, it was announced in July that he would in fact be leaving.

The 50-year-old was placed on "gardening leave" until the end of the year.

However, Costa may not be without a job for too long as Mercedes GP are reportedly interested in signing him.

According to Auto Sprint, Merc GP team boss Ross Brawn, a former Ferrari man himself, wants Costa as part of a 'profound restructuring of the team.'

Brawn is believed to have already spoken to Dieter Zetsche, the head of Daimler, about his need to employ more technical staff in order to compete against the likes of McLaren, Ferrari and Red Bull.

And Costa is at the top of his list.

i dont think its the right move for them, but they do need to step up in 2012, so maybe doing something is better than nothing

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