Campro Engine
CAMPRO engine is derived from the combination of Cam Profile, designed and developed by Proton using Lotus technologies. In short, Campro engine is a normal engine, which can be used in future with the latest technology, such as variable inlet and IAFM. They claim that Campro offers more power and reduced fuel consumption. This was proved true when it won the most fuel efficient cars title with Proton Persona family.
The Campro engine coded as S4PH is a basic DOHC 16-valve 1.6 L engine that can generate 110 bhp (82 kW) @ 6,000 rpm of power & 148 Nm of torque. This is the engine that powers the Proton Gen-2. The S4PH engine can be fitted with Cam Profile Switching (CPS) and Variable Inlet Manifold (VIM) technology. Besides this 1.6 L engine, Proton has also designed the 1.3 L version of the Campro engine.
Despite being powerful at higher revs, the S4PH engine seems to be reportedly sluggish at lower revs. This is proven when Gen-2 is taken uphill whereby manual transmission version have to be shifted a lot between 2nd gear and 3rd gear. This is caused by the dropping torque at the vital 2000 ~ 3000 rpm operating range, where the torque actually decreases before picking up back to the maximum torque at 4,000 rpm. This characteristic can be observed in manufacturer’s engine performance curve data.
Campro CPS Engine
Following to the Campro engine, CAMPRO CPS (Cam Profile Switching) uses a variable valve lift system and a variable length intake manifold to generate maximum power and perk up the CPS engine’s torque curve compared to the standard DOHC Campro engine.
CPS’s Variable-length Intake Manifold (VIM) switches between a long intake manifold at stumpy engine speeds and a short intake manifold at elevated engine speeds. Proton is using a longer intake manifold to achieve slower air flow; as this is found to promote better the mixing of air with fuel. The short intake manifold allows more air in quicker. This is extremely useful at higher rpms.
The CPS system utilizes a trilobite camshaft to toggle between two different cam profiles whereby one of the profiles provide low valve lift, while the other one provides high valve lift. Lower valve lift profile is utilized at low to mid engine speeds to maintain idling quality while reducing unnecessary emissions. The high lift cam profile is used when the engine is spinning from mid to high engine speeds and this is intended to improve the torque and hp.
VIM toggles at 4,800 rpm, while the CPS system toggles over at 3,800 rpm. The result is 127 horsepower @ 6,500 rpm and 150Nm of torque at 4,500 rpm compared to the normal Campro’s 110 horsepower @ 6,000 rpm and 148Nm of torque at 4,000 rpm. The all new CPS engine made its first entry into the market in the facelifted Proton GEN2 that was released in Thailand, and made its first Malaysian debut in the Proton Waja Campro 1.6 Premium (CPS). Besides the 1.6L version, the Campro CPS engine is also available in 1.8L version.
CAMPRO engine is derived from the combination of Cam Profile, designed and developed by Proton using Lotus technologies. In short, Campro engine is a normal engine, which can be used in future with the latest technology, such as variable inlet and IAFM. They claim that Campro offers more power and reduced fuel consumption. This was proved true when it won the most fuel efficient cars title with Proton Persona family.
The Campro engine coded as S4PH is a basic DOHC 16-valve 1.6 L engine that can generate 110 bhp (82 kW) @ 6,000 rpm of power & 148 Nm of torque. This is the engine that powers the Proton Gen-2. The S4PH engine can be fitted with Cam Profile Switching (CPS) and Variable Inlet Manifold (VIM) technology. Besides this 1.6 L engine, Proton has also designed the 1.3 L version of the Campro engine.
Despite being powerful at higher revs, the S4PH engine seems to be reportedly sluggish at lower revs. This is proven when Gen-2 is taken uphill whereby manual transmission version have to be shifted a lot between 2nd gear and 3rd gear. This is caused by the dropping torque at the vital 2000 ~ 3000 rpm operating range, where the torque actually decreases before picking up back to the maximum torque at 4,000 rpm. This characteristic can be observed in manufacturer’s engine performance curve data.
Campro CPS Engine
Following to the Campro engine, CAMPRO CPS (Cam Profile Switching) uses a variable valve lift system and a variable length intake manifold to generate maximum power and perk up the CPS engine’s torque curve compared to the standard DOHC Campro engine.
CPS’s Variable-length Intake Manifold (VIM) switches between a long intake manifold at stumpy engine speeds and a short intake manifold at elevated engine speeds. Proton is using a longer intake manifold to achieve slower air flow; as this is found to promote better the mixing of air with fuel. The short intake manifold allows more air in quicker. This is extremely useful at higher rpms.
The CPS system utilizes a trilobite camshaft to toggle between two different cam profiles whereby one of the profiles provide low valve lift, while the other one provides high valve lift. Lower valve lift profile is utilized at low to mid engine speeds to maintain idling quality while reducing unnecessary emissions. The high lift cam profile is used when the engine is spinning from mid to high engine speeds and this is intended to improve the torque and hp.
VIM toggles at 4,800 rpm, while the CPS system toggles over at 3,800 rpm. The result is 127 horsepower @ 6,500 rpm and 150Nm of torque at 4,500 rpm compared to the normal Campro’s 110 horsepower @ 6,000 rpm and 148Nm of torque at 4,000 rpm. The all new CPS engine made its first entry into the market in the facelifted Proton GEN2 that was released in Thailand, and made its first Malaysian debut in the Proton Waja Campro 1.6 Premium (CPS). Besides the 1.6L version, the Campro CPS engine is also available in 1.8L version.
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