M-133 CMC Aston Martin DB4 GT, 1961 Engine with Showcase
Looking at this tightly packed and solidly built 6-cylinder in-line induction engine, one can virtually feel the powerful drive and high torque that it is capable of. It features a displacement of 3.7 liters (3,670 ccm) and a compression ratio of 9.7:1. With an output of 1,314 hp at 6,000 rpm, this motor unit accelerates the DB4 GT Zagato from 0 to 100 km/hr in 6.2 seconds.
The crankcase, the cylinder heads and pistons are made of an aluminum alloy. The chromed crankshaft is mounted on seven bearings. Two overhead camshafts control the operations of the inverted valves (two for each cylinder). The ignition system consists of two distributors placed at the rear top flange of the engine block unit. For efficient combustion, each cylinder is installed with two spark plugs. Mixture formation is ensured by three Weber dual carburetors 45 DCOE4. For oil feed, pressure lubrication is also adopted. A separate oil cooler keeps oil temperature within permissible limits.
Technical data of the original engine: