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Old 07-28-2013, 04:29 PM   #1
kartracing6
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Default 2002 wrx blown motor?

Hi I was driving my car the other day and when I hit 5000-6000rpm in first it stopped accelerating as fast and started making a loud knocking sound. Does anyone have any ideas what it is? The timing belt is still aligned and there are no metal shavings in the oil pan. It currently starts but barely runs.

http://www.youtube.com/watch?v=C5_nM...ature=youtu.be

here is a link to my startup this afternoon...
any advice would be appreciated, thanks!
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Old 07-28-2013, 04:40 PM   #2
Imprzaboy89
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This should be good
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Old 07-28-2013, 04:46 PM   #3
Frankh21
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What oil u running?
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Old 07-28-2013, 04:52 PM   #4
kartracing6
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I was using mobil 1 5w30 synthetic oil. The engine was still full of oil and It had been around 4000-5000km since I last changed it
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Old 07-28-2013, 04:53 PM   #5
kartracing6
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I'm beggining to think it sounds like bad rod bearings
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Old 07-28-2013, 05:12 PM   #6
Jack
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Quote:
Originally Posted by kartracing6 View Post
I'm beggining to think it sounds like bad rod bearings
Your description certainly does not rule this out.
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Old 07-28-2013, 08:50 PM   #7
Frankh21
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One more thing, was the car warmed up or cold when you hit 5-6000 rpms.
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Old 07-28-2013, 09:22 PM   #8
kartracing6
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it was at normal operating temperatures
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Old 07-28-2013, 09:41 PM   #9
2gnt2wrx
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Another subie motor lost to m1 5w-30...

I would pull your plugs and see if the piston is smashing the heads yet. It sounds really bad...
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Old 07-28-2013, 11:52 PM   #10
Frankh21
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I'd save some money and invest in a new or rebuilt long block.
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Old 07-29-2013, 07:50 PM   #11
kartracing6
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Old 07-29-2013, 10:32 PM   #12
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Quote:
Originally Posted by 2gnt2wrx View Post
Another subie motor lost to m1 5w-30...

I would pull your plugs and see if the piston is smashing the heads yet. It sounds really bad...
Its so sad
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Old 07-30-2013, 08:03 AM   #13
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Been there, and usually it damage a lot of thing other than just the bearings.
So like Frankh21 said, get a new longblock
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Old 07-30-2013, 10:56 AM   #14
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another one bites the dust. an another one and another one bites the dust.
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Old 07-30-2013, 11:54 AM   #15
kartracing6
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Yeah I think I will have to get a new longblock because rebuilding would be too expensive.
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Old 07-30-2013, 12:05 PM   #16
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Make sure you get a new oil cooler. A oil pan and pick up wouldn't be a bad idea either. Otherwise make sure they are super clean before you reuse them.
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Old 07-30-2013, 03:18 PM   #17
kartracing6
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Would I need all that even if it came with the other engine I would buy? Probably would be a good idea either way just to be safe
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Old 07-30-2013, 08:15 PM   #18
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mobil 5-30 and rod knock .....do a serch ,this is not the first time .dont run the car untill you fix it ...if you rebuild get a new oil cooler ,oil pan,oil pump,and oil pick up . if it's knocking there is metal shaving in your oil and all through the motor.sorry dude rebuild or new motor time . do a serch on mobil oil
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Old 07-31-2013, 07:57 AM   #19
bluesubie
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Do not run ANY oil that says Resource Conserving in the API donut on the back of the bottle. If you want to run Mobil1, use the 0W-40 or TDT 5W-40.

This M1 5W-30 analysis showed that the oil sheared to a 20 grade in 2,500 miles.
http://forums.nasioc.com/forums/show....php?t=2527193

-Dennis
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Old 07-31-2013, 08:48 AM   #20
kartracing6
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Quote:
mobil 5-30 and rod knock .....do a serch ,this is not the first time
Yeah I learned that after it was too late...

Quote:
Do not run ANY oil that says Resource Conserving in the API donut on the back of the bottle. If you want to run Mobil1, use the 0W-40 or TDT 5W-40.

This M1 5W-30 analysis showed that the oil sheared to a 20 grade in 2,500 miles.
http://forums.nasioc.com/forums/show....php?t=2527193

-Dennis
Thanks for the info, will keep that in mind, I want my new engine to last!
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Old 07-31-2013, 09:07 AM   #21
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Now, are you SURE it was 5-6k in first and not 6-7k in first? It sounds to me like you overspun your engine...

Howard
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Old 07-31-2013, 09:19 AM   #22
kartracing6
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Quote:
Now, are you SURE it was 5-6k in first and not 6-7k in first? It sounds to me like you overspun your engine...
I think it might have been closer to 6-7k to be completely honest. I have to admit the engine failure was probably mostly my fault...

Edit: I also ordered a new longblock yesterday because I'm pretty sure the engine's toast. Lots of shavings in the oil pan
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Old 07-31-2013, 09:46 AM   #23
hetkind
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Now, this MIGHT be preaching to the choir, but if you are going to drive this like a RALLY car, you have to MAINTAIN it like a RALLY car. Use a higher viscosity oil, change it more often and DON'T overspin the engine:-)

And if you hear ANY noise from the lower end of the engine, pull the pan and inspect bearings...

I hope the longblock didn't set you back too much, but keep the old engine, take it apart, do a Post Mortem and see what failed and why. I don't know much about Subaru machine shop work, but there is a shop near me that rebuilds Subaru motors when they don't have enough BMW motorcycle work to keep busy.

If the valves didn't hit the piston, repair costs will be much lower.

Howard
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Old 07-31-2013, 10:00 AM   #24
kartracing6
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Quote:
Now, this MIGHT be preaching to the choir, but if you are going to drive this like a RALLY car, you have to MAINTAIN it like a RALLY car. Use a higher viscosity oil, change it more often and DON'T overspin the engine:-)

And if you hear ANY noise from the lower end of the engine, pull the pan and inspect bearings...

I hope the longblock didn't set you back too much, but keep the old engine, take it apart, do a Post Mortem and see what failed and why. I don't know much about Subaru machine shop work, but there is a shop near me that rebuilds Subaru motors when they don't have enough BMW motorcycle work to keep busy.

If the valves didn't hit the piston, repair costs will be much lower.
You're right, I change the oil every 5000km and I thought mobil 1 was a good oil to use but I guess not!
removing the oil pan revealed a fried rod bearing on the big end.
I paid 1300 usd for the engine, all I need from my old one are the exhaust, intercooler, intake, turbo etc.

Last edited by kartracing6; 07-31-2013 at 10:26 AM.
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Old 07-31-2013, 12:19 PM   #25
Scooby2002
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1300 for a used engine? Not bad. Mind if I ask where you bought it from?
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