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Scania unveils its 350bhp turbo V8
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• Elimination of exhaust smoking, even at low revs, is claimed by ScaniaNabis for a new 14.2-titre V8 turbocharged diesel which it unveiled this week at the Frankfurt Motor Show. Detailed design of combustion chambers, turbocharger and inlet manifolds, and the use of special five-hole fuel injectors to promote good mixing, are aimed at achieving excellent burning and hence economy and clean running, while a smoke limiter is built into the injection pump.
The new engine, which develops 350bhp (DIN) at 2,300 rpm and 930 lb.ft. (127 kgm) torque at 1,450 rpm, is used by the Swedish manufacturer in a new range of Scania trucks based closely on the 110 series in all respects except the engine. The new models are designated LB 140, LBS 140 and LBT 140 and all have the now-familiar 110-style forwardcontrol cab.
Cylinders are disposed in a 90deg Vee in the new power unit, and have a bore and stroke of 127mm x 140mm; compression ratio is 15:1. The engine, which has been under test since 1966 and was designed as far back as 1962, follows Scania practice in having removable wet cylinder liners and generously dimensioned components. Three sealing rings are fitted at the base of each liner. Each cylinder head is separate, held down by eight long bolts, and steel head gaskets are used.
Both banks of cylinders are pressure-charged by a single turbocharger of new design. A single-stage exhaust-driven radial turbine drives a single-stage centrifugal compressor; the exhaust pipes are brought together in pairs and the gases are conveyed through four spiral ducts to the turbine wheel. The supercharger is lubricated and cooled by oil directly from the engine's central lubricating system, but separately filtered on the way.
The engine's cooling system uses a single gear-driven pump and a 10-bladed fan, and has two thermostats in parallel. Coolant passes from the pump through two longitudinal ducts and along the outer side of each bank; it then passes through separate apertures to each cylinder, round the cylinder, up past the head and into return ducts along the inner top of the block.
Extra piston cooling is provided by forcing lubricating oil through nozzles in the small end of each connecting rod and onto the underside of the crown. The aluminium pistons have a cast-in insert for the top, chromiumplated ring.
All auxiliaries, except the belt-driven alternator, have gear drive. The five-bearing forged crankshaft has replaceable bolt-on counterweights. Up to 60 bhp at 2,300 rpm can be taken from a power take-off point at the left front of the engine, e.g. for constant drive of a hydraulic pump, The main engine output is
Three forward-control chassis in the new Scania L8 140 range are fitted with the 350 bhp V.8 Right-hand-drive models will not be available until 1971.
through a twin-plate dry clutch.
As in other Scania engines, a combined centrifugal and cyclone-type oil filtering system is used: oil is conveyed to bearings mainly through drillings in the block rather than pipes. An oil cooler is fitted.
Specific fuel consumption at maximum torque is claimed to be 0.351 lb/bhp /h (160 gun /hph), and b.m.e.p. is 136.5 psi. (9.67kg