beautifully engineered

The Lancia Triflux engine is Beautifully Engineered

The Lancia ECV car originally produced over 600 horsepower (448 kW) from a 1759 cc twin-turbocharged engine. This engine, christened Triflux, was built in an unusual fashion; the valves were crossed (for each side of the cylinder there was an intake and an exhaust valve), so that the two turbochargers could be fed with two separate manifolds. A single manifold carried the intake air (hence the name, from the three separate air ducts).

The twin KKK turbochargers can be linked in a modular turbocharging unit, with a single turbo being used at low revs to build up power and then, when the revolutions are right, the second turbo comes into play to take the power even higher. With such a unit, high torque is produced at low revs with no loss of maximum power and greatly reduced turbo lag.

The system produces improved heat distribution in the cylinder head to even out the expansions that take place on a turbo unit, also helping to improve engine cooling. It is now possible to link a single central wastegate valve to the two exhaust manifolds and, if the latest variable geometry turbochargers are utilised, the wastegate can be eliminated altogether.

The air that leaves the turbochargers is injected into the radiators or intercoolers before being passed on to the induction manifold and thence back into the cycle, while the compactness of the engine allowed the engineers much more freedom to plan the exhaust system to eliminate resonance problems encountered in more crowded systems.

Centrally mounted, longitudinal with 4 cyl inline.
1795CC. Bore x stroke, 88.5mm x 71.5mm
Triflux’ double reverse flow cylinder head with 4 valves/cylinder and twin overhead camshafts.
Compression ratio, 7.5:1
600bhp @ 8000rpm
55mKg@5000rpm.
Twin KKK (K26 type) turbochargers with individual intercoolers.
Weber/Magnetti Marelli injection/ignition with electronically controlled turbocharging level.
Dry sump lubrication with pressure and extraction pumps and air/oil radiators.