All Porsche 911s have had flat-six over­head-camshaft en­gines. But within that for­mat, there have been many dif­fer­ent de­signs, none more revered than the so-called ‘Mezger’ engine found in the back of the GT3 RS and many other 911s. It’s named af­ter its cre­ator, renowned Porsche en­gi­neer Hans Mezger.

Mezger did many en­gines for Porsche, in­clud­ing the 1.5-litre flat-eight that took Porsche’s only For­mula 1 win (the 1962 French Grand Prix), the 1200bhp 5.4-litre flat-12 in Porsche’s all-con­quer­ing 917/30 Can-am car and the Porsche TAG Turbo engine that won three F1 world cham­pi­onships for Mclaren be­tween 1984 and 1986.

In fact, Mezger was in­volved in al­most all it­er­a­tions of the flat-six up un­til wa­ter cool­ing was in­tro­duced in 1998, but the point is that while all other 911s then adopted the new and what would turn out to be some­times trou­ble­some engine, all the 911 Tur­bos and all the Gt-se­ries cars stuck with the Mezger de­sign right up to the 991-se­ries. Why? Be­cause it was a known quan­tity, had won Le Mans in the Porsche 911 GT1-98 in 1998 and was al­most un­break­able. The fact that it sounded sim­ply in­cred­i­ble, too, was merely the ic­ing on the cake.

Mezger 3.8 in the back of this GT3 RS puts out 444bhp and revs to 8500rpm

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