Details about the specification of F1's alternative -- or client -- engine for 2017 have emerged.

Previously, it was believed independent outfits like Ilmor or Cosworth were being invited to bid to exclusively supply Formula One with a 2.2-liter twin-turbo V6, with the regulations to run parallel to the existing 1.6-liter engines.

The specifications now say the new engine will be a 2.5-liter V6 or smaller, with one or two turbochargers producing greater than 870 hp.

The engine will have no limits on revs, engine durability or fuel flow, as well as no restrictions on freedom in the area of the exhaust; it will also have no hybrid power.

Mercedes, the F1 championship team for 2014 and 2015, has made it clear that its officials are not happy with the plan.

"I think many of us share the opinion that the 'balance of performance engine' does not work. It doesn't work in any other category," said Mercedes team boss Toto Wolff. "We hear about the aggravation in GT racing, and it (hurts) my head in hearing these ideas."

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