CFE Engines

Here my thought about CFE Engines

The Brief.

CFE. It means Charged Fuel Efficiency. The engine was born out of the necessity rather than the desire to soup up the Campro engine to rival the Lamborghini. It was back in 2009, when the Exora MPV was at its final validation stage. It became clear that the Achilles heel of the much lauded Proton's first MPV would be its powertrain, where even the CPS mechanism won't be enough to mask the lack of torque, long plagued the Campro family, and the unsuitability of small capacity NA gasoline to power such as weighty people carrier.  Proton has concluded that it would develop a turbocharged variant of the Campro engine instead of buying-in a 2.0L NA gasoline engine. it was decided pretty much from the beginning to stay away from the Gasoline Direct Injection (GDI) - although that such a trend at that time and a commoner today - to accommodate the low octane rating and fuel quality of Proton's export market and its home market itself.

The Design.

As the CFE is Campro based, there was a necessity to carry over the cylinder block, or else, Proton might as well make an all-new engine if the cylinder block needs to be totally redesigned. Hence an intensive round of Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD) were performed to assess the limit of the Campro's block without compromising its stress-endurance and jeopardizing its coolant effectiveness. 

The results of the FEA and CFD indicated that the cylinder block could be retained with the improvement to the water jacket to sustain the higher heat duty of the forced-fed engine. Another changes required was the modification to the oil gallery to include the piston cooling jet. The stroke of the crank also has been shortened to 86mm , a 2mm reduction. This is because the height of Campro's block did not provide sufficient space to increase the piston crown strength with the size limitation to withstand the compression ratio which it self is boosted by charged air from the turbo

Perhaps, just maybe the necessity to retain the major engine components from the donor Campro was the driving factor of 'just' 138bhp and 205Nm instead of 156bhp and 240Nm of the Peugeot's engine. In its bid to make the business sense, the output has to be capped somewhat before it start needing an all-new engine design altogether.

The reduction in stroke, while retaining 76mm bore has reduced the swept capacity to 1,561cc from 1,597cc. Compression ratio was set at 8.9:1. To accommodate the higher cylinder pressure, a new piston design with 19mm floating piston pin. The turbo boost was kept between 0.6 to 0.8 bar.