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Aluminum offers lighter weight at the expense of strength, hardness and often cost. However, with care it can be substituted for many of the components and is widely used. Aluminum crank cases, cylinder blocks, heads and pistons are commonplace. The first airplane engine to fly, in the Wright Flyer of 1903, had an aluminum cylinder block. [1]
Nash supplied Healey's company with the powertrain components: the Ambassador's inline six-cylinder OHV 234.8 cu in (3.85 L) engine and three-speed manual transmission with Borg-Warner overdrive. Healey fitted a lighter, higher-compression aluminum cylinder head (in place of the cast-iron stock item) with twin 1.75-inch (44 mm) SU carburetors .
Cylinder bore: 92.9 mm (3.66 in) Piston stroke: 86 mm (3.39 in) Cylinder block material: Aluminum: Cylinder head material: Aluminum: Valvetrain: DOHC with VVT: Combustion; Fuel system: Direct injected: Fuel type: Gasoline: Oil system: Wet sump: Cooling system: Water cooled: Output; Power output: 248–302 hp (185–225 kW; 251–306 PS) Torque ...
Cox also sold the muffler, cylinder and high comp. glow head components of the QZ as a Muffler Conversion Kit (Cat#495) for $2.98. 1976 QRC (Cat#450-1 - manufactured 1976–1996) The QRC was a modified Babe Bee engine that had a muffler and larger (8cc) fuel tank.
The QR25DE is a 2.5 L (2,488 cc) variant built with cast steel connecting rods, a steel timing chain, counter-rotating balance shafts, and an aluminum intake manifold. The engine bore and stroke is 89 mm × 100 mm (3.50 in × 3.94 in) and a compression ratio ranging from 9.5:1 to 10.5:1 depending on the vehicle.
The engine's major components include an aluminum crankcase, two three-cylinder aluminum cylinder heads with integral intake manifolds, and six individual iron cylinder barrels. The #1 cylinder is at the right rear with cylinders 1, 3, and 5 on the right, while #2 is the left rear with cylinders 2, 4, and 6 on the left.
Cylinder heads refurbished with new valve guides, seats and polished valves, resulting in a gain of 30 bhp. Added remote controlled door opening mechanism and poppers to compensate for the shaved door handles; new 8 volt battery added for the mechanism. The window tint was removed. New steel wheels with chrome hubcaps and whitewall tyres.
Like the EA series engines, the ER series engine featured 2-valve cylinder heads with hydraulic lash adjusters and the block shared the same bore and stroke. While recognised as bearing many similarities to the Subaru EA82 engine, there are numerous differences in design between the two engines and a large portion of parts are unique to the ER27.