Here's an article I found on the web;
Campro CPS and VIM engineThe 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 standard DOHC 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 is using a longer intake manifold to achieve slower air flow; as they found this promotes better mixing with fuel. The short intake manifold allows more air in faster. This is beneficial at high RPMs[2].
The Cam Profile Switching (CPS) system uses a trilobite 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[2].
VIM switches from the long to short runner at 4,800 rpm, while the CPS system switches over at 3,800 rpm. The result is 127 horsepower (96kW) at 6,500 rpm and 150Nm of torque at 4,500 rpm compared to the non-CPS Campro’s 110 horsepower (82kW) at 6,000 rpm and 148Nm of torque at 4,000 rpm[2]. 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 facelifted Proton GEN2 launched in Thailand[3][4], and made its first Malaysian debut in the Proton Waja Campro 1.6 Premium (CPS)[2]. Besides the 1.6L version, the Campro CPS engine is also available in 1.8L version; however, the bigger 1.8L version has not yet debuted in any of Proton's car (as in 30 April 2008) but rather made its first debut in a Malaysian-made hovercraft[5].
Applications:-
* 2008 Proton Gen-2 (H-line)
* 2008 Proton Waja
Campro IAFM engine[U]
The Campro IAFM (Integrated Air-Fuel Module) is essentially a basic DOHC Campro engine equipped with a variable-length intake manifold, developed under a joint fast track programme which began in April 2005 by EPMB, Bosch and Proton. However, the IAFM differs from the VIM (Variable Inlet Manifold) for the Campro CPS engine in terms as follows:-[6]
1. The IAFM is a stand-alone module that can be fitted with a basic DOHC Campro engine whereas the VIM needs to work in conjunction with the CPS system in a Campro CPS engine.[6]
2. The IAFM is operated by the engine vacuum while the VIM uses an ECU-controlled solenoid.[6]
The Integrated Air-Fuel Module for the Proton Campro engine debuted in the second-generation Proton Saga, which was launched on 18 January 2008. We first heard of it back in October 2006 where it was still in advanced tooling stages, and ever since then everyone has been eagerly awaiting for the first Campros to roll out with the new air fuel module.
With the IAFM, the 1.3L engine used in the Proton Saga now produces 98 bhp (73 kW) @ 6,500 rpm[7]. The maximum torque is slightly reduced to 113.2 N·m (83.5 ft·lbf); however, the engine has broader torque range and the noticeable torque dip in the basic DOHC Campro engine has been eliminated[7]. However, the official brochure is only published with the familiar 94 bhp (70 kW) @ 6,000 rpm power and 120 N-m @ 4,000 rpm torque for consistency with other 1.3L Proton models.[8]
Meanwhile, the output of the 1.6L version of the IAFM engine which debuted in the 2008 Proton Gen-2 M-Line produces 110 bhp (82 kW) @ 6,500 rpm of horsepower and 148 N·m (109 ft·lbf) of torque, and the torque dip around 2,500-3,500 rpm has been eliminated.[9]
Applications:-
* 2008 Proton Saga
* 2008 Proton Gen-2 (M-line)
* 2008 Proton Persona
(sourced from:
http://en.wikipedia.org/wiki/Campro_engine)
alternatively, check out:
http://www.proton.com/innovation/rnd/campro.php