Re: its on a gp 1.4 16v engine but not on a panda 100hp
the one on top of your cover is the camshaft variator (yes the 16v has one) it's for egr again for emissions not vvt before anyone says it gives you more power lol
VVT stands for variable valve timing... which is what the phase transformer does, varies the advance/retard of the camshafts to improve combustion and deliver optimum efficiency at all times. Granted the top-end performance differs little from a normal 1.4 16v.
The Port De-Activation system is used in conjunction with the EGR, improving swirl when required by directing it through the turbulence port, to maintain stable combustion with high levels of exhaust gas present.
A bit of technical info for you Dave-
"The development of this new engine has led to the redefinition and use of new components such as (the main ones are listed below):
- a new head with two different independent inlet ports for each cylinder (one improved for filling and the other designed for turbulence) for the use of a new PDA system (Port De-Activation slider) in other words the exclusion of one of the inlet ports at a given engine speed range).
- new head gasket
- new pistons
- new phase transformer (VVT - Continous phase Variator) for the inlet and exhaust
- new belt routing
- new intake manifold
- new camshafts
- new Bosch ME 7.6.3 electronic injection/ignition system
with the aim of further improving consumption, emissions and performance and reducing friction losses.
The position of the valves has also been maintained, but that of the spark plugs has been modified to place the spark in an optimum position that guarantees complete combustion in all conditions. The new design involves a chamber closer to the spark plug and with a smaller volume on the cylinder head side.
The cyclical combustion stability has been improved in the presence of high EGR rates (Exhaust Gas Recirculation). All of this means lower consumption for the same performance."
By-passing the Phase transformer will be tricky at best, if not impossible. It controls both advance and retard by directing oil into the cam pulley where it acts on vanes to move the camshaft independantly. With it removed/blocked-off, the camshaft will likely 'float about' between the two states causing running faults (in fact, a basic diagnostic procedure for testing the operation of the phase variator is to disconnect the wiring and ensure the engine idles roughly).