According to Wikipedia (that unimpeachable source of all knowledge ), it was R11 that was de-rated and named "Griffon". It seems, however, that this was not developed further and that the later Griffon was an entirely separate design, so there would be even less claim to authenticity in the hypothetical event of one being fitted to "Bluebird"f1steveuk wrote:Most people will tell you, "don't get Holter started on the R Type"!!!!
I know the very first prototype Griffin was actually R41 (the last unit built from memory), but I suspect by the time it went into production, it had little in common with the R, although maybe Mike from his aero' interests knows better?
That said, given the resources and expertise that have gone into re-manufacturing, for example, 1930's Auto-Union V16 Grand Prix engines, then surely it cannot be beyond the wit of man to re-create a reasonably authentic R Type?