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Old 07-18-2013, 04:34 PM   #1
Fernando_221
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Damaged rod bearing

So, after some miles (around 50.000), I had a damaged rod bearing.
I have Cosworth IM, 280 cams, OBX header, 2.5" exhaust and a custom CAI, SCT X3 custom tune, running motorcraft 5w30 and changing every 5k miles.

Damaged rod bearing was at 4th cylinder. Other cylinders were worn but no serious damage.
Started making a thick noise, and was increasing.
This already happened to anyone here before?
Rev limiter was at 7800rpm... I think this was the cause.
Crankshaft was perfect, only surface stains that were removed with a light polishing. After polishing still at 47.00mm.

The car is already back, now with a 2.3 head.

Damaged at 4th cylinder


2 and 3


crankshaft 4th cylinder journal



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Old 07-18-2013, 04:52 PM   #2
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I believe 6800 is the factory set rev limit. 7800 is pretty high for a stock bottom end, you may want to reset that
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Old 07-18-2013, 06:26 PM   #3
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Quote:
Originally Posted by JPFocus86 View Post
I believe 6800 is the factory set rev limit. 7800 is pretty high for a stock bottom end, you may want to reset that
I see no reason to have cosworth IM and cams and don't rev at least 7500rpm.

Now it's at 7500.
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Old 07-18-2013, 08:01 PM   #4
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Ok, you'll be doing this job again
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Old 07-18-2013, 08:53 PM   #5
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Ok, you'll be doing this job again
No problem doing it every 50k miles, it's a modified engine.

Caterham engines requires servicing every 10k miles or kilometer, don't remember.
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Old 07-18-2013, 09:27 PM   #6
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yeah i'm no professional engine builder but i'd be sure that even w/ those mods listed, isn't enough to support anything beyond 7200. i see you mention a 7800 limiter, but at those speeds wouldn't you need some stiffer valve springs? it's just my opinion but i say if you want those high rpms then run the engine thats in the car as long as you can while simultaneously building another engine w/ stronger internals to handle those speeds...
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Old 07-19-2013, 09:00 AM   #7
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not sure what the 280 cams are, but they probably require springs since all aftermarket cams bigger than stage 1 do require valve train upgrade. so the rev lim isn't the problem, I saw stock Ranger crank rev past 10k before the none keyed crank start to fail only due to the timing gear shifting. so IM pretty sure it's only a small detail problem!
did you check the bearing clearance?
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Old 07-19-2013, 11:36 PM   #8
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not sure what the 280 cams are, but they probably require springs since all aftermarket cams bigger than stage 1 do require valve train upgrade. so the rev lim isn't the problem, I saw stock Ranger crank rev past 10k before the none keyed crank start to fail only due to the timing gear shifting. so IM pretty sure it's only a small detail problem!
did you check the bearing clearance?
Yeah, A ranger crank is a great crank. I'd upgrade to forged pistons & rods & install 1 piece ss valves.
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Old 07-21-2013, 12:49 PM   #9
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Thi is on ur project engine? The 2.5??
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Old 07-28-2013, 05:05 PM   #10
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Thi is on ur project engine? The 2.5??
No, it was on the 2.0

The 2.5 is not ready yet.
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