Appendix 6 of the 2008 F1 Sporting Regulations details the engine homologation regulations.
1. A homologated engine is an engine identical in every respect to :
- (i) an engine delivered to the FIA prior to 1 June 2006 or,
(ii) an engine delivered to the FIA after 1 June 2006, or modified and re-delivered to the FIA after 1 June 2006, which the FIA is satisfied, in its absolute discretion and after full consultation with all other suppliers of engines for the Championship, could fairly and equitably be allowed to compete with other homologated engines.
2. The supplier of a homologated engine and/or the team using the homologated engine must take and/or facilitate such steps as the FIA may at any time and in its absolute discretion determine in order to satisfy the FIA that an engine used at an Event is indeed identical to the corresponding engine delivered to and held by the FIA.
3. The FIA, in consultation with the TWG and the engine suppliers, will from time to time issue indicative information as to the tests and inspection procedures to be applied.
Following discussions with the Manufacturers, it was agreed in August to 'freeze' the engines from the 2006 Chinese Grand Prix. The following was agreed:
- Engines will be stabilised from the 2006 Chinese Grand Prix. These will be the only engines used from and including the 2007 season.
- This means that no further developments of the engines will be allowed other than retuning for the 19,000 rpm limit, to be agreed in each case with the FIA under the terms of the 2008 Formula One Sporting Regulations
Then in September and in another meeting between the FIA and the teams including the manufacturers, it was agreed to 'freeze' the engine used in the last 2 races of the season and that the 'freeze' will come into force for the 2007 season.
- Homologated engine regulations already in force for 2008 to apply for 2007. The homologated engine to be that used at the 2006 Japanese Grand Prix, subject to retuning for a maximum of 19,000 rpm. Full details of the retuning to be submitted to the FIA no later than December 15, 2006, and the definitive engine to be delivered by March 1, 2007
In October, the World Motor Sport Council approved those changes. The final text was:
Engines homologated and used during the last two Events of 2006 must now be used during the 2007, 2008, 2009 and 2010 seasons