Good Day,
The basic Campro engine coded as S4PH is a basic DOHC 16-valve 1.6 L engine that produces 110 bhp (82 kW) @ 6,000 rpm of power and 148 N·m (109 ft·lbf) 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 Litre engine, Proton has produced the 1.3 Litre version of the Campro engine.

Even though the S4PH engine seems to be quite powerful at higher revs, its performance is reportedly sluggish at lower revs and this is proven by driving the Gen-2 uphill where drivers who drive the manual transmission version have to shift a lot between 2nd gear and 3rd gear. This is due to its torque dip in the crucial 2,000 ~ 3,000 rpm operating range, where the torque actually decreases before picking up back to the maximum torque at 4,000 rpm. This torque characteristic can be clearly seen in manufacturer published engine performance curves.[1]

Another engine option for the basic DOHC engine is a 1.3L engine coded as S4PE. The S4PE engine produces 94 bhp (70 kW) @ 6,000 rpm and the torque of 120 N·m (89 ft·lbf) @ 4,000 rpm, which is more powerful than the other 1.3L rivals, even with variable valve timing technology, it also (like its bigger brother) displays a torque dip at typical engine speeds of 2,000 to 3,000 rpm.

The bore x stroke dimensions for both engines are as follows:-

S4PH (1.6L): 76 x 88 mm, resulting the displacement of 1598 cc.
S4PE (1.3L): 76 x 73.4 mm, resulting the displacement of 1332 cc.

Replacing after market is not necessary improving your torque and pick up. The engine is design differently. Just accelarate smoothly in the begining and once reaching is optimum speed , then you really feeling the engine power and roaring.

I been driving Proton Waja Campro 1.6E, year 2007. Firstly, i do had the same impression but later i felt once it reach 60 km/h or 3rd gear you can notice the engine power.

Hi,
Burning smell shown that your engine oil breaks down prematurely due to high temperature which your engine oil is not design to. Take out the dipstick from your engine and try to smell it , if it smell burn strongly advise immediately change the engine oil to prevent engine damage in long run.

For optimum performance for high revving and high operating temperature Fully Synthetic engine oil is recommended as it oil vicosity is 5W-40 or 0W-40. I strongly recommend Castrol Edge.

By the way, your friend recommendation for more revving will get rid the burning smell is totally wrong. It do more harm and damaged to your engine's piston rather than fixing the situation. Petrol engine is not design for revving when idling. During revving when idling the petrol input is more into the combustion chamber to be burn to convert energy to move the camshaft but over revving will cause incomplete fuel burning and clean up the engine oil protecting the engine's piston and resulting premature damage to your engine.

This post has been edited by allankoh007: Dec 22 2009, 09:06 AM

This apply to all car on the road. Well, to reduce the curb weight something gotta sacrifice to lighten it up for a original design car.