Watch And Listen How A Subaru Engine Rod Knock Vs Piston Slap Sounds Like

Difference between a Subaru engine rod knock vs who a piston slap (which is minor) sounds like. They sound similar but very are very different.

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[pavoutsinas]

The New York accent shined through over that rod knock 👍 best comparison video online. thank you!

[MTCHSMLN]

Thank you so much for this very practical and helpful video! It's so frustrating sifting through all the junk information on the internet, but finally finding a video with the actual sounds was completely worth it.

[reidthompson]

Thanks for the video!! My Honda B20 has some bottom end tapping when the coolant is warmed up enough for the idle rpm to drop lower but the oil and metal isn’t very warm yet, and I was 98% sure it was piston slap (fairly common on the B series engines) because its never complained about me wrapping it out to 7000+ rpm, and this confirmed that and put my rod knock fears aside. Thanks!

[vihreelinja]

Thanks. My subie definitely do NOT have a rod knock. Perfect explanation.

[Tomas.X]

Picked up a rust-free 2006 Impreza 2.5i 6 months ago for my son. It had a rattle on start-up, and some noises, classic Subaru, they're all I drive. Now, he is gone all the time and I see and hear it infrequently. But when I heard it idle at times, I thought it sounded worse. I changed the oil, but no change in sound. I had access to the car just after Christmas and the loud tapping/knocking occurred in the following cycle:

Distinct at idle, increased upon accellerating, then gone while cruising along. When letting off the gas to coast approaching a stop sign, the noise returns when it gets to 25 mph > idle.

The local Subaru specialist had it today for some other things, and he checked the sound, confirmed no exhaust leaks, and suggested rod knock. When I drove it home, I wasn't sure if I'm now oversensitive or if the symptoms described were far more pronounced. Never had this with any of my Subaru's. Any opinions?

[moorefab]

This is exactly right. I just built a 2008 2.5 SOHC engine using a good 2001 block and crank. Good used 2008 rods and new 2008 pistons. I put new rod bearings in but couldn’t get a good set of main bearings anywhere so I opted to use the old ones that were in very good shape. I plasti gauged all the bearings and they were all perfectly in spec. The wrist pins to small rod end were perfectly in spec. The new pistons had about 8 thou of piston to bore clearance which was a ways out of spec but I decided to give it a go since the ring end gap was good. The heads are rebuilt and surfaced. Anyway, what I’m getting at, is it had a small knock like the first example but not near as loud and it worried me but I know for sure it couldn’t have been rods because I went through all them. I know the pistons were sloppy so that’s gotta be what it is. Goes away when warm or when reved.

[jve]

Good video. I just seized my 2008 Subaru Impreza 2.0 engine completely. The mechanic had just a quick look because it was not worth it to do a full inspection but he thought the crankshaft cracked. It made the knocking sound as well before it seized. It already used excessive amounts of oil for months. Fixing it would break the bank so I'll bring it to the scrapyard.

[thatman]

You forgot to rev the engine knock so we can hear the difference.

[MrCWoodhouse]

Thank you Sir. I was able to identify the rod knock in a 2016 Kia at the used car lot. Didn't buy the car, of course, thanks to your video.

[a.m.tacobellrun]

Bought a 2015 legacy 2.5i a little over a year ago. Bought it at 108000 now has 145000. Engine gets a little loud when cold starting. Michigan weather for reference. Obviously cars hate cold weather but hearing what a problematic boxer sounds like helps a lot. Now i know what to look for in case something is actually wrong. That being said, these engines are noisy for a 4 cylinder

[bryanwillis]

My 15 Legacy is nice and quiet with 125, 000 miles on it. My wifes 18 Legacy with 70, 000 is loud. I treat them the same except, I take the time to warm up the engine, she doesn’t. People say warming up an engine is useless?

[TurboWolf]

Alright now stuntman hold her to the boards and get to it! LOL

[joeyhdz]

Yep, I always have loved an engine that will blow up very quietly😆👌

[davidn]

Awesome video at 62YO I am thinking on getting a Used Subaru, what years do you think are the better ones, Thank You

[dogkamusica]

Tengo un Subaru Impreza sport 2017, es normal que cuando lo encienda este acelerado y luego se normalize?

[PouyaLucky]

Thanks for explanations. a month ago picked up a 2006 WRX with 124k miles, after some day of enthusiastic driving I heard a very faint ticking noise for a few seconds, I revved slightly and the sound went away. Next morning I checked oil, and it was quite dry, I added 4 Liters Castrol 5W30 and the sound has fully gone, and the car drove normally, but I can see some oil spill on the lower plastic parts, I am scared this was a case of lemon car being masked with thicker oil with some major engine issues... Mechanic is away on sick leave and other one is booked till end of week, and I am panicking a bit.. Would appreciate some input

[JRosepenolope]

Thank you so much! But I’m not mechanically in inclined so I’m still a little confused. I have a Toyota carolla 2022. I was 1, 326 miles past my oil change. I got the car in February. I’m not sure how the past owners took care of it though. Anyway, I got an oil change the noise stopped. Was it just a piston slap? I haven’t heard it since but maybe I haven’t drove enough with it :/

[KingIsBored]

my first car was burning oil and i had no idea, so one day my engine exploded on the highway, and it was very loud knocking sound. now 10 years later, im facing a problem with my hyundai kona 2020 burning oil, keep adding more every few days

[sandstorm]

Thank you for showing both! I don't have a Subaru but my Sebring is making a similar noise (210k miles) to the piston knock. Hopefully that's what it is but I guess I'll find out LOL

[KorayRuthlessvillian]

Is piston slap for a few seconds on cold start normal?