Difference between revisions of "1.6 THP Engine"

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Revision as of 08:28, 17 December 2016

The 1.6 THP engine is found in several PSA models, and also some BMW models. It was developed as a joint project by BMW and PSA.

Variants

There have been several variants of the THP engine

Technical features

The THP engine is a petrol engine with direct fuel injection into the combustion chamber. It veatures raviable valve timing and most versions are turbocharged.

Known issues

Timing chain and sprockets wear

Inlet valve carbon fouling

There have been many reported instances of reduced engine performance and sometimes engine failure due to a build-up of carbon behind the inlet valves. The source of the carbon is usually attributed to oil vapour from the PCV (positive crankcase ventilation) system, although some sources blame leakage of the valve seals or even turbocharger bearing seals. These sources of oil contamination of the valves are present in many petrol engines, but with more conventional indirect injection or carburettor fuel delivery, the inlet valve is washed by petrol on every cylcle, so any oil vapour is moved into the combustion chamber before it can form a deposit on the back of the valve.