Apr 8 2008, 10:30 PM
QUOTE(yu_wang @ Apr 7 2008, 10:17 PM)
more info here:
http://en.wikipedia.org/wiki/Campro_engine
For those lazy ppl, i'll try to summarize. There are 3 Campro engines out there:
1. Plain old CamPro (all proton cars after Waja and before New Saga)
2. CamPro IAFM (New Saga and latest batch Persona)
3. CamPro CPS (Gen-2 CPS and Waja CPS)
The plain CamPro was supposed to have cam profile switching technology since the very first version, but it was dropped to save cost(?). As a result it had a big ugly torque dip at lower rpms (i.e. no power unless you rev high).
IAFM stands for Intake Air Fuel Module (lol @ i am fat man). I dont know how it works, but basically the torque dip is gone. No need to rev so high, easier to handle in city driving and traffic jams.
CPS is the real Cam Profile Switching technology, which also has the same effect as IAFM. Maybe a little bit more overall power. It comes together with something called VIM (Variable Intake Manifold) but usually it's shortened to CPS only.
Interesingly, if you try to read CamPro CPS in full (no short form) then it sounds like Cam Profile Cam Profile Switching.
It should also be noted that none of these are cutting edge technology developed by proton. They exist in many other cars, probably under different names.
Sorry if i made any mistake in my post...cya
CPS doesnt have same effect as IAFM.. they are totally diffrent systemhttp://en.wikipedia.org/wiki/Campro_engine
For those lazy ppl, i'll try to summarize. There are 3 Campro engines out there:
1. Plain old CamPro (all proton cars after Waja and before New Saga)
2. CamPro IAFM (New Saga and latest batch Persona)
3. CamPro CPS (Gen-2 CPS and Waja CPS)
The plain CamPro was supposed to have cam profile switching technology since the very first version, but it was dropped to save cost(?). As a result it had a big ugly torque dip at lower rpms (i.e. no power unless you rev high).
IAFM stands for Intake Air Fuel Module (lol @ i am fat man). I dont know how it works, but basically the torque dip is gone. No need to rev so high, easier to handle in city driving and traffic jams.
CPS is the real Cam Profile Switching technology, which also has the same effect as IAFM. Maybe a little bit more overall power. It comes together with something called VIM (Variable Intake Manifold) but usually it's shortened to CPS only.
Interesingly, if you try to read CamPro CPS in full (no short form) then it sounds like Cam Profile Cam Profile Switching.
It should also be noted that none of these are cutting edge technology developed by proton. They exist in many other cars, probably under different names.Sorry if i made any mistake in my post...cya
QUOTE(athlonxp @ Apr 7 2008, 10:17 PM)
campro = no variable cam, no variable valve, no nothing
iafm = TVIS found on 1st gen 4AGE from AE86 from year 1985
cps = variable valve lift which dont work. a sophisticated and well designed engine with valve lift tech should make 165hp like B16A. this "new technology" could be found in 1988 EF9 CRX B16A
vim = variable inlet manifold
today is 7/4/2008. phailed
they need to comply with emission standard.. get ur facts right before blindly bash.. u can notice most cars especially the corolla altis 1.6 vvti producing low and lower poweriafm = TVIS found on 1st gen 4AGE from AE86 from year 1985
cps = variable valve lift which dont work. a sophisticated and well designed engine with valve lift tech should make 165hp like B16A. this "new technology" could be found in 1988 EF9 CRX B16A
vim = variable inlet manifold
today is 7/4/2008. phailed
QUOTE(yu_wang @ Apr 7 2008, 10:45 PM)
Then again, Gen-2 CPS engine block still says Campro CPS. I have photographic evidence. 
the campro is not meant to be read as cam profile..its a name, juz that the word derrived from the word cam profile
QUOTE(aizad02 @ Apr 7 2008, 11:57 PM)
it tot original cam campro oledi use high cam.or i'm wrong???dat's why campro power only comes at high revs.
original campro power comes in high rev because there is a torque dip in low rpm, hence u need to rev surpass the dip to get back the power it should haveQUOTE(sphiroth @ Apr 7 2008, 11:59 PM)
CPS has 2 set of cam, once hit 3.8rpm, it will change to high-cam.
2 set of cam since it is DOHC, not because it is CPS..they have 2 sets of lobe on 1 camshaft
QUOTE(athlonxp @ Apr 8 2008, 06:20 PM)
the problem is with proton do not have the ability to produce a high revving and reliable engine at a reasonable cost..proton can put in any degree cam lobe they want..but the engine will not be reliable because it is made by proton at constant 7-8k rpm.
cps is running on a rather high cam profile (but not high enough to produce astonishing power), this make low end suffer and make fuel economy worse.
if proton want to make it a high peformance engine, the low rpm power too will suffer badly like a B16A or 4AGE.
we can say that campro is something in between power and fuel economy. but both dont works
cps as a high performance engine = phailed
cps as a fuel economical engine = phailed
japanese manufacture rarely produce those high peformance engine in low price family saloon anymore.
again with your blind bash cps is running on a rather high cam profile (but not high enough to produce astonishing power), this make low end suffer and make fuel economy worse.
if proton want to make it a high peformance engine, the low rpm power too will suffer badly like a B16A or 4AGE.
we can say that campro is something in between power and fuel economy. but both dont works
cps as a high performance engine = phailed
cps as a fuel economical engine = phailed
japanese manufacture rarely produce those high peformance engine in low price family saloon anymore.
high revving engine as in 4G92 MIVEC and B16 VTEC is because the lobes is a wild 1 and u need to keep revving to extract all the power out..
since the campro using milder profile, revving pass the max hp and torque is a waste as u dont get any significant power and yet the fuel is drained
im using MIVEC auto and i can easily 140km/h without switching the second lobe
indirectly u r saying latest i-VTEC all are trash as their redline also till 6.5k
QUOTE(sphiroth @ Apr 8 2008, 07:39 PM)
I don't think at low rev CPS can perform as efficient as VVT system as the latter varies the timing across the RPM range. But the best I think is i-Vtec where the lift is varies across the RPM range and VVT-L system (variable valve timing + lift) . 
CPS is considered a VVT system as it varies the valve timing but not continously..VVTL-i has been phased out due to bad emission it make..
Quote
0.0299sec
0.35
6 queries
GZIP Disabled