. "SOHC" . "0.0836" . "M121" . . "M121 engine" . "0.001897" . . . . "M 121" . . . "154.0" . . . . . "0.087" . . "Mercedes-Benz M121 engine" . "M 121" . . "0.085" . "''M121''" . . "Mercedes-Benz M121 engine" . "55929.1635" . . . . "straight-four" . . "8.5:1, 9.0:1" .