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The rulebook doesn't come into play. The FIA enacted engine homologation for the 2008 season. The homologation rules were a bit ineffective for regulating horsepower so they equalized all engines in 2009, and drafted engine lease regulations in the Concorde Agreement. The engines were re-equalized by the FIA in 2010 at the request of Renault, who were considering withdrawal, and at the request of Cosworth, who were charged with supplying the teams who replaced BMW, Toyota, and Honda.
Prior to mandatory engine homologation and engine leasing, private teams required political connections or giant piles of cash to receive competitive engines. The Red Bull empire (and Brawn GP's 2009 triumph) was made possible by the new engine rules. MotoGP is moving closer to F1 regulations.
