The 928 started out with a 4.5L V-8 (928), 5.0L V-8 (928 S4), and ended with a 5.4L V-8 (928 GTS).
The 924 used a 2.0L I-4 and the turbo model {931} used the same block.
The 924S used the 2.5L I-4 from the 944.
The 944 started with a 2.5L I-4, had a 2.7L I-4 in 1989 only, and ended with a 3.0L I-4 (944S2)
The turbo model {951} used the same 2.5L displacement but had 217hp in 1986-1988. The 951S, also in 1988, had 250hp. The 1989 951 was not called S, but was 250hp.
The 968 used a 3.0L I-4 with VarioCam during it's 1992-1995 run.
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