Why campro engines fail on crank!!! Campro 1.6 vs 4g92p

speed2horizon

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speed2horizon

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well ideally thats was the list....


but in real life is....theres some other parts need to be replaced also prior to top overhaul(mostly due to overheating)

-waterpump
-radiator hose
-waterpump pipe
-timingbelt (snapped/old)
-radiator flushing
-engine oil+oil filter
-new coolant


if u add those...then u'll understand why i quoted a bit higher price... :adore:

*blood....maybe u can ask them full quotation of replaced parts and labour
Sorry, I didn't know u were quoting. I though ur car were sent to workshop with that price. I did a cylinder head overhaul. Which is why it's costly. Normal top overhaul doesn't involved so many parts.

Just out of curiosity,does these problem among campro still persist?Still got cases such as this nowadays?From what i heard,this is a batch faulty.Some said it's the design of target wheel dat causes this issue.So, can anyone enlight me with the info...batch problem or design problem?
I heard of the target wheel too. Somehow only cylinder 1-4 matches the tdc, but the 2-3 cylinder didn't when the target wheel is turned 180 degree. That's what I heard. Just sharing, no offense.
 

jswong

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jswong

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Putting the target wheel on the *inside* of the crankcase with the crank angle sensor located so close to it seems to be cause of the problem, because it seems like in all the cases, the destruction of the target wheel leads to the fracturing of the flywheel-side of the crankshaft, the same area the target wheel is mounted.

Could it be that power shifting or clutch-dumping at high-revs result in momentary shocks that are not properly absorbed/dissipated by the crankshaft end/thrust bearings, thus causing the target wheel to be deflected towards the crank angle sensor?

Apparently the 4G18 crankshaft has similar dimensions to the S4PH's crankshaft, except that the balancers are a bit larger and thus the crankshaft housing needs to be skimmed a little for more clearance. I wonder if anyone has modded the 4G18 crank into the S4PH block, and used a crank pulley similar to the 4G15 SVDO's, with the target wheel located externally, and use it together with the 4G15 SVDO's external hall-effect crank angle sensor.
 

senbe84

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senbe84

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Only campro carries a design which have target wheel inside the crankcase?does other engine design do the same way?If only campro does dat, meaning maybe the campro design have weak spot but if other engine maker does carry the same design,maybe its a material failure...Just wondering...
 

speed2horizon

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speed2horizon

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Putting the target wheel on the *inside* of the crankcase with the crank angle sensor located so close to it seems to be cause of the problem, because it seems like in all the cases, the destruction of the target wheel leads to the fracturing of the flywheel-side of the crankshaft, the same area the target wheel is mounted.

Could it be that power shifting or clutch-dumping at high-revs result in momentary shocks that are not properly absorbed/dissipated by the crankshaft end/thrust bearings, thus causing the target wheel to be deflected towards the crank angle sensor?

Apparently the 4G18 crankshaft has similar dimensions to the S4PH's crankshaft, except that the balancers are a bit larger and thus the crankshaft housing needs to be skimmed a little for more clearance. I wonder if anyone has modded the 4G18 crank into the S4PH block, and used a crank pulley similar to the 4G15 SVDO's, with the target wheel located externally, and use it together with the 4G15 SVDO's external hall-effect crank angle sensor.
different stroke...
 

sagacokelat

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sagacokelat

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good info bro... worried oredi bcoz im always gasak my car huhuhu... no wonder la gen 2 1st batch have issue engine pecah...
i think new campro oredi improve this part because no complaint about engine issue....
 

drexchan

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drexchan

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4G18 stroker kit can be easily modified to match a S4P block but the capacity will be slightly lower and the target wheel needs to be relocated on the crank pulley. A new bracket is needed for the sensor too.

However, with lighter conrods from 4G15, hi-comp and oversized S4PE pistons, skim block (~0.5mm), plus dynamic balancing, probably nitride surface hardening, it will perform better than stock and more durable.

The question is - is it worth it?
 

senbe84

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senbe84

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my drex,how much is the nitride harden will cost us?most of us dont know the price for it,so not sure worth it or not.enlight us if u may.huhu.

btw,since u always deal with campro,have u heard about campro crankshaft snap nowadays?
 

senbe84

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senbe84

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mostly would cost how much for this treatment?if u dont have exact pricing,might as well quote the range of price we could expect for such services.As a guideline for us for future planning.

The problem of crankshaft snap is design failure or material failure bro?since u always deal with campro,i think ur the one who most trusted for such questions...
 

Alok

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Alok

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The hole in the conrod bearing is not for oil entry. Almost all (if not all) crank bearings and conrod bearings oil supply is from the crank shaft it self. The hole is mainly for piston cooling.

Most aftermarket conrod do not have the oil hole. They can work without it..

The holes under the piston are for oil drainage from the piston oil scraper rings. It is never intended for oil supply to the rings..

I suspect what cause premature failure of the conrod bearing is the conrod and the conrod cap are not aligned properly.. proton bad machine work...
i thk the engine oil also important, full synthetic oil can do much lubricating in big end bearing... how do you thk?
 

satria_neo

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satria_neo

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I did not read thru the entire thread. However I personally do not think the oil holes are the cause of the issue. This is because I previously have a BMW 318IS which uses the M42B18 engine. There are no oil holes on the conrod and bearings.

Failure of rod bearings or crank is unheard of except for oil starvation under racing conditions. Hence, I would say the hole for lubrication is optional.
 

Kevin_Tan

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Kevin_Tan

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Can't believe this topic still popular until today. Actually the crankshaft snap problem still happen until today. But only happen on those campro that used to accelerate from static or to be precised those drag frequently. i think those who know me personally , they know that my campro made in 2004/5 or first batch running with turbocharge system until today. Engine still running fine until today , 4 yrs already with turbocharge and amount of torque produced was 2.5 times of standard modified campro. The reason why my engine won't fail until today , i never practice to accelerate from static with WOT and high rev launching. High speed cruising at 220km/hr and full boosting 0.6 bar for some distance on highway quite often. Here what i try to deliver is campro crankshaft can not withstand or force to move weight 1.2 tan from static up to certain speed too frequent , the shock of sudden engage of clutch which carried weight 1.2 tan will snap the crankshaft if the shock or transient just happen at right timing. Recently i just receive a msg of my customer's crankshaft and that car built for drag purpose. Crankshaft snap after many session of drag launching practice. But this fellow was lucky that crankshaft totally snap off during low speed cruising and engine stall due to trigger wheel wasn't rotate as supposed to be. The crack line propagation is not happen immediate but extend a little bit with each sudden shock happened.
 

misai

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misai

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wah...this make me worry even more...since my car clocked 40000km...and i do rev and highspeed a few times every month...scare man...wonder can mobil 1 engine oil im using now can protect this shit o nt...:rofl:....proton oh proton....why can make something perfect..we people just need a reliable car is more than enough...:vollkommenauf:

and wonder can it last at least 150000km++ without any overhaul or problem....btw any campro user pass 150k km??
so far mine already 220000km++ hari2 gasak..still no problem mehh...

---------- Post added at 10:31 AM ---------- 6 hour anti-bump limit - Previous post was at 09:50 AM ----------

btw do u think skimming + timing belt and piston ring replacement = rm1500 is normal?
can get new with that 1.5k...