Weird knock

[A80Avant]

I'm all for humor and those who know me and met me can tell more about it, but this was not well placed.

If it was knock and detonation damage to piston spring or such, I shouldn't have good compression in that cylinder.

Anyway, I thought someone may have had something like this happen to them. I'll update in 2 weeks when we reopen the engine

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[A80Avant]

https://youtu.be/5i39i-PyQxA

Watching this makes me realise that it's just a conrods bearing failure. So hopefully we will be ok.

I will keep you updated

[rxl]

if thats the sound you have some serios problems

[Thuppu]

Pre-ignition and knock can destroy a rod bearing(also small end bushing) without any visible damage on the piston. I got knocking sound. Piston top, ringlands and rings was undamaged, no marks at all... but piston pin looked like this:




Everything can be possible. There may not always be a clear reason for a damage. It could be a rod bearing failure due oil starvation, and then the more you run the engine the bigger is the chance to destroy the crank.

[A80Avant]

Photo doesn't open, but does it make a difference that with high oil pressure the noise goes away and this only sounds on idle? I'm thinking something to do with the oil on that area

Ok I saw the picture. I probably need to leave the car alone until it gets opened up.

[Error404]

I agree with the above, sounds like a rod or pin issue to me, since the noise stops when the load is removed.
I would not continue to run the engine until you have found the cause. It is sooo hard to find a good block these days, you don't want a rod through the side!

[A80Avant]

Having lived with the car for so long I have learnt.
I have 2 blocks and waiting for a set of pistons and rods..

[Error404]

Well even so, better to keep those as spares

[A80Avant]

That was the point. To have as much as possible available when needed. I have all the bottom end parts ready. Now waiting for the pistons and hopefully if the rods are not needed I'll keep them for a stroker build.
I'll update this thread once we open up the engine

[rs2coupe]

Hope you get it figured out Vasili

[A80Avant]

I'm sure it will. Expensive but it will get sorted one way or another

[GazzaG60]

vas. recently had a dead pos channel. similar sound pissed through plug. you changed the plug. change the channel and it was back to usual.

do you get the rattle around 2k rpm. if so its rod bearings. remember my scats have been in for about 8-9 years now. sat without turning in garage for 5-6 years. still great. cant fault them regardless of whats said. so long as they are weight matched.

whats the oil pressure. personally

[A80Avant]

Oil pressure is perfect. When cold 5 bar and there is no knock, when warm and sitting at 2 bar it does it.

I have ls2 coils so they are meant to be trouble free. I had recently 2 coil cables go bad on me causing misfires. That went away after replacing them.

If I changed the position of the POS it should do the same but in different cylinder. I'll try that one more time

Mine only does it on idle. It goes away as soon as revs go up and of course oil pressure.

[GazzaG60]

maybe worth different oil. id recommend millers 10-60. my engine is so much quieter on that.

your a quack. get yer listening gear out. get to the heart of the matter

[A80Avant]

I had 10w60 castrol and it was doing it. We engine flushed and used 0w40 mobil 1. Still does it

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