Formula 1 race director Charlie Whiting has revealed that Mercedes, Ferrari and Renault's power units are all within 0.3 seconds of each other, meeting the FIA's requirement for convergence between manufacturers.

As part of a push to create some kind of parity between engine manufacturers in F1, the FIA decided last year it would analyse the time gap after the first three races in 2017 and decide if convergence had been achieed.

"There was a lot of discussion last year about obligation to supply power units, which everyone agreed to and it got put into the regulation," Whiting explained. "But a part of that agreement there was power unit convergence that everybody agreed to. It's a system that we will assess after the first three races whether we had power unit convergence.

"This was defined as three out of the four power unit manufacturers being within 0.3 seconds of each other around Barcelona. Now, it's far more complicated than that because there was a very detailed methodology for simulating this based on all the data that only we have."

Whiting confirmed the F1 Strategy Group was informed last week that convergence had been achieved, with Mercedes, Ferrari and Renault's power units judged to be separated by less than 0.3 seconds.

"We take all the data that we can from the first three races - all the power units - and we've got some simulation engineers in Geneva, who along with Fabrice Lom sat down and analysed all this data and using the method that was agreed by all the power unit manufacturers, to derive from these simulations what it meant in terms of lap time around Barcelona," Whiting said.

"This was done and we announced the results of this to the Strategy Group the other day, and we have convergence. Convergence is defined by the top three being within 0.3 seconds around Barcelona. This only applies to the power unit, of course. So the top three power units are within 0.3 seconds.

While convergence has been achieved among the top three power unit suppliers, the fourth - Honda - remains adrift of its rivals, but Whiting said the tests were not intended to help ailing manufacturers.

"Well it wasn't a matter of helping anybody, it was a matter of establishing whether the measures that have been introduced - losing the tokens and all of those sorts of things that were to help convergence - whether it had worked," Whiting said.

"Part of the obligation to supply but it was not totally connected with obligation to supply but it was part of the whole agreement. One of the reasons for making all those changes - the main thing being losing the tokens - there were a number of other measures that were put in place to try and assist, and it seems to have worked."

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