The Proton CamPro engine is an internal combustion engine manufactured by Malaysian automobile company Proton Holdings. It is the first engine model to be developed in-house by Proton. The name CamPro is short for "cam profiling". This engine powers the Proton Gen-2, Proton Satria Neo, Proton Waja Campro, Proton Persona, Proton Saga, Proton Exora, Proton Preve, Proton Suprima S and Proton Iriz. The CamPro engine was created to show Proton's ability to make its own engines that produce good power output and meet newer emission standards. The engine prototype was first unveiled on 6 October 2000 at the Lotus factory in UK before it debuted in the 2004 Proton Gen•2. All CamPro engines incorporate drive-by-wire technology (specifically electronic throttle control) for better response, eliminating the need for friction-generating mechanical linkages and cables.
CamPro technical specifications
Variants
Original CamPro engine
The first CamPro engine made its debut in 2004 fitted to the newly released Gen•2 models. It was codenamed S4PH and was a DOHC 16-valve 1.6-litre engine that produced 110 bhp (82 kW) of power at 6,000 rpm and 148 N⋅m (109 ft⋅lbf) of torque at 4,000 rpm. The S4PH engine was ironically not equipped with Cam Profile Switching (CPS) even though its Campro designation was an abbreviation of Cam Profile Switching. It also lacked the Variable Inlet Manifold (VIM) technology of later CamPro engines. Proton also produced a 1.3-litre version of this original CamPro engine and codenamed it S4PE. Even though the S4PH engine had contemporary maximum power and torque outputs, its performance was reportedly sluggish in real world driving. This performance deficiency was attributed to a pronounced torque dip in the crucial 2,500 to 3,500 rpm mid engine speed range where torque actually decreased before picking up back to the maximum torque level at 4,000 rpm. This torque characteristic could also clearly be seen in manufacturer published engine performance curves. The original Campro 1.3-litre variant produced 94 bhp (70 kW; 95 PS) of power at 6,000 rpm and 120 N⋅m (89 lb⋅ft) of torque at 4,000 rpm, again contemporary outputs for a 1.3-litre passenger car engine of the time. This engine also displayed a torque dip in the mid engine speed range, similar to the one in the larger variant. The bore x stroke dimensions for both engines are as follows:-
S4PH (1.6L): 76 mm (3.0 in) x 88 mm (3.5 in), resulting the displacement of 1,598 cc. S4PE (1.3L): 76 mm (3.0 in) x 73.4 mm (2.9 in), resulting the displacement of 1,332 cc. Applications:
2004–2008 Proton Gen-2 2006–2008 Proton Waja 2006–2009 Proton Satria Neo (Lite & M-Line) 2007–2008 Proton Persona 2010–2015 Youngman Lotus L5
CamPro CPS and VIM engine
The CamPro CPS engine uses a variable valve lift system (Cam Profile Switching system) and a variable length intake manifold (VIM; not to be confused with the stand-alone IAFM used in the 2008 Proton Saga) to boost maximum power and improve the CPS engine's torque curve over the original CamPro engine. The engine's Variable-length Intake Manifold (VIM) switches between a long intake manifold at low engine speeds and a short intake manifold at higher engine speeds. Proton cars use a longer intake manifold to achieve slower air flow; as it was found that promotes better mixing with fuel. The short intake manifold allows more air in faster. This is beneficial at high RPMs. The Cam Profile Switching (CPS) system uses a tri-lobe camshaft to switch between two different cam profiles. One cam profile provides low valve lift, while the other cam profile has a high valve lift. The low valve lift cam profile is used at low to mid engine speeds to maintain idling quality and reduce emissions, while the high lift cam profile is used when the engine is spinning at mid to high engine speeds improve peak horsepower and torque. Unlike the other similar variable valve timing systems such as the Honda VTEC, the Toyota VVT-i and the Mitsubishi MIVEC which use rocker arm locking pins to change the valve timing, the CPS system uses direct-acting tappets with locking pins to change the valve timing and lift profile. VIM switches from the long to short runner at 4,800 rpm, while the CPS system switches over at 3,800 rpm (4,400 rpm in the Proton Satria Neo CPS). The result is 125 bhp (93 kW; 127 PS) at 6,500 rpm and 150 N⋅m (110 ft⋅lbf) of torque at 4,500 rpm compared to the non-CPS CamPro's 110 bhp (82 kW; 112 PS) at 6,000 rpm and 148 N⋅m (109 ft⋅lbf) of torque at 4,000 rpm. Proton claims that there is better response and torque at low engine speeds of between 2000 - 2500 rpm. The new CPS engine first made its debut in the face-lifted Proton Gen•2 launched in Thailand in 2008, and made its first Malaysian debut in the Proton Waja CamPro 1.6 Premium (CPS). Applications:
2008–2010 Proton Gen-2 (H-line) 2008–2011 Proton Waja 2009–2015 Proton Satria Neo (H-Line) 2009–2016 Proton Exora 2010–2012 Proton Gen-2 Facelift (M-Line)
CamPro IAFM engine
The CamPro IAFM (Intake Air-Fuel Module) is essentially an original CamPro engine equipped with a variable-length intake manifold, developed under a joint fast track programme that began in April 2005 by EPMB, Bosch and Proton. However, the IAFM differs from the VIM (Variable Inlet Manifold) for the CamPro CPS engine as follows:
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