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Old 07-31-2020, 08:54 PM   #1
defury
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Default Rod knock? (video)


You can hear the noise slightly better near the end, its subtle but underneath the rest of the engine noise (fans kicked in mid recording) the engine was hot as I had just been driving for 30 minutes, this is why I used the throttle to really rev the engine as the cable was to hot to hold.

Since I've taken delivery 11,000km ago the vehicle has had 3 oil changes all with motul xcess 5w40, the car consumes no oil, the timing belt and tensioners/pullys and water pump were all done, AC compressor rebuilt, cam seals checked, valve cover gaskets replaced (began sweating no real leak caught it early) and cams and cam gears/avcs sensors inspected. No boost leaks recently tested, knock sensor recently replaced to diagnose Phantom ecu knock, tech heard no real engine knock with mics hooked up to the block while driving.

Coolant temp in this video is 190f and the oil was checked and was full before recording.

I see no reason this would be rod knock but there's definately a low hollow knock from something. There's also a ticking from the valve train, I need to adjust the lifters so that's not the noise I'm referring to.

Thoughts?
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Old 08-01-2020, 12:07 AM   #2
D-Rodman
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Piston slap.
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Old 08-01-2020, 04:28 AM   #3
defury
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Quote:
Originally Posted by D-Rodman View Post
Piston slap.
Even though the engine is fully warmed up after a 30 minutes drive?
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Old 08-01-2020, 09:48 AM   #4
D-Rodman
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Default Rod knock? (video)

Pistons can still slap, itís not rod knock on that video.
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Old 08-01-2020, 12:57 PM   #5
subaru_gc8
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Quote:
Originally Posted by D-Rodman View Post
Pistons can still slap, it’s not rod knock on that video.
unless your have a forged engine, slap will means you probasbly haver alot of wear on your rings. might wnat to take the oil fill cap off when its cold to see if there is any smoke coming out of it
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Old 08-01-2020, 02:22 PM   #6
defury
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Originally Posted by subaru_gc8 View Post
unless your have a forged engine, slap will means you probasbly haver alot of wear on your rings. might wnat to take the oil fill cap off when its cold to see if there is any smoke coming out of it
The vehicle consumes no oil so I doubt the rings are bad. It's the first Subaru I've owned where I never have to top up the oil.
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Old 08-01-2020, 10:20 PM   #7
Shik
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I wouldn't be concerned with that at all. I can't remember hearing an ej205 that didn't have that noise. Piston slap has been around Subarus since the 90s. Here's a short video explaining a bit about it from a shop that has been around a long time:


It sounds like you are on top of all the maintenance. Just run it, keep up on the basics, and you'll be good to go.
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Old 08-02-2020, 12:00 PM   #8
Samurai Jack
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I'm not hearing anything but a normal EJ205 at idle or otherwise.
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