The cylinder head was entirely new, aluminium alloy as before but with different combustion chambers, recessed valves, 3mm larger exhaust vaIves, sparking plugs with platinum silver electrodes moved across to intake side, and the usual lower compression ratio necessary for any supercharging - this was partly done with different pistons - 7.5 instead the 924's 9.3-to-1 the effective maximum compression at 0.7 bar (10.15 psi) supercharging pressure was 10.8-to-1. iron-block engine's capacity remained the same and its bottom end was deemed strong enough to be left unaltered, there were considerable changes elsewhere. But the 924's chassis was always cring out for more power - so how did the 2 litre cope with 10 psi of turbocharger boost?Īlthough the 1984 c.c. Of course the engineers went to work on that engine so that, by the time it was installed in the engine bay of the 924, there was little resemblance. THE 924 HAD A HUMBLE BEGINNING when you consider the donk was derived from the 2 litre unit used in a Volkswagen van.
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