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Old 04-24-2014, 09:26 PM   #1
jproy12
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Default Piston Slap?

I'm new to the 2.0L turbo engines, I previously had a 2.5L N/A and a 2.5L turbo, but never did I have a 2.0L turbo. I was wondering if it's normal to have, what I assume is piston slap on a 2.0L turbo engine? I never had piston slap on either of my 2.5L engines...

My sound is exactly as this one, my car does it when the engine is still a bit warm as well, not as bad as the video, but still does it, should I be worried?
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Old 04-25-2014, 03:09 AM   #2
Saabaru300
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That sounds exactly the same as my engine sound when it had spun 2 rod bearings. I would not drive that if I were you until you get that fully inspected. the piston to wall tolerances on these motors are pretty tight that you shouldn't really hear piston slap unless you have a built motor. Those have bigger tolerances usually. Don't quote me on any of this but definitely get the motor checked out. It could be toast. :/
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Old 04-25-2014, 03:32 AM   #3
sWagonRX
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Mine has that sound when it's cold (not as audible, but still present), and pretty much goes away when warm. I hear this is normal due to the design of the pistons and the short skirt they have, but I've also heard it's not too normal so it's a two-sided argument....but as the engine gets older and starts to wear down, the tolerances will become greater leading to increased mechanical noise, especially when the engine is cold. After the engine warms up, the metal expands and the noise dissipates. How many miles are on the engine, btw?
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Old 04-25-2014, 07:42 AM   #4
jproy12
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I'll double check this weekend, I've heard mixed reviews on this situation, most say it's normal "Subaru" piston-slap, and other might say it could lead to rod-knock... For sure I heard it at idle, when I would give it a bit of gas, didn't check over 2K rpm and under load.

Engine has/had around 82K miles (130K km), somewhat of a refreshed engine, head gasket and timing belt where done, new oil pan and heads where checked. Long story short, bought a Saab 9-2x Aero without an engine, bought the semi-refurbished engine this way, got it installed by the seller of the engine and car has been this way. The seller is a well-known Subaru Mechanics and told me that it's "normal", but I am having some doubts about it.

But would one say this is normal for a 2.0L turbo engine to have "piston slap"?
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Old 04-25-2014, 10:00 AM   #5
rynebieniasz
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This noise sounds normal. Id say its definitely not rod knock..Mine makes a very similar noise albeit on a built 205..check your oil for metal shavings and keep driving the thing as it is OK
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Old 04-25-2014, 10:43 AM   #6
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Quote:
Originally Posted by rynebieniasz View Post
This noise sounds normal. Id say its definitely not rod knock..Mine makes a very similar noise albeit on a built 205..check your oil for metal shavings and keep driving the thing as it is OK
I'm actually on the fence. I do hear a faint 'knock'. It's that hollowed out knock sound, not the other random assortment of noises and valves. It's audible in the video.

In my opinion, it shouldn't sound like that.
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Old 04-25-2014, 10:58 AM   #7
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I'd first get a long ass screwdriver and use it as a stethoscope on the injectors to rule those in or out as the cause as our injectors tend to be noisy. Also a used oil analysis can determine if there is bearing wear.
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Old 04-25-2014, 11:09 AM   #8
jproy12
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Quote:
Originally Posted by rynebieniasz View Post
This noise sounds normal. Id say its definitely not rod knock..Mine makes a very similar noise albeit on a built 205..check your oil for metal shavings and keep driving the thing as it is OK
Yea, I really doubt it's rod knock, but I'll get another friend of mine, mechanics as well to check it out.
Quote:
Originally Posted by Unabomber View Post
I'd first get a long ass screwdriver and use it as a stethoscope on the injectors to rule those in or out as the cause as our injectors tend to be noisy. Also a used oil analysis can determine if there is bearing wear.
I didn't think of this, but I agree that this is a great idea, at my next oil change, I'll get an analysis done on the oil and go from there.

Thanks all for the input, oil level is fine, and doesn't seem to have any "metal flacking" in it, at least not on the dipstick!

JP
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Old 04-26-2014, 12:50 AM   #9
rynebieniasz
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doesnt sound like rod knock in vid..that "hollowed out knock sound" is piston slap on a cold engine probly with some mileage.you can see the car has barely began to warm up by the end of the clip
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Old 04-26-2014, 04:14 PM   #10
jproy12
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Here's a video of mine:
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Old 04-26-2014, 06:41 PM   #11
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Quote:
Originally Posted by jproy12 View Post
Mine sounds similar, it's slap. If you are freaking out get an oil sample kit from Blackstone labs.
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Old 04-26-2014, 07:06 PM   #12
jproy12
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Quote:
Originally Posted by 2gnt2wrx View Post
Mine sounds similar, it's slap. If you are freaking out get an oil sample kit from Blackstone labs.
It's not the fact that I'm freaking out, it's the fact that the engine is rebuilt and only has about 82000miles, which is pissing me off, and I've seen engines with lots more milage...
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Old 04-26-2014, 09:14 PM   #13
sdunlimited
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Mine sounds identical to yours. Quiets down w/a fresh oil change and warmed up (20mins of driving) but it's always there.
I hear it most as I let out the clutch and the engine begins to bog going into gear. Turns into a slow tap-tap-tap or knock and disappears into engine/road noise just about 1k RPM.
Doing a UOA on mine at the next OCI because I'm getting indications she's wearing a little more than normal. 125k miles on mine currently.
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Old 04-26-2014, 11:05 PM   #14
2gnt2wrx
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Quote:
Originally Posted by jproy12 View Post
It's not the fact that I'm freaking out, it's the fact that the engine is rebuilt and only has about 82000miles, which is pissing me off, and I've seen engines with lots more milage...
All 4 wrx/sti's I've owned do it. Especially my built sti.
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