Strange noise from Engine

[Slash200]

Hi,

i got a strange noise from my engine when the engine is warm.
It comes not from the head. The valveplay is good.
On this video you can hear the noise. It comes from the bottom of the engine.

[video=youtube;C1B48MgA9Ps]http://www.youtube.com/watch?v=C1B48MgA9Ps[/video]

The crank and rod bearings are new clevites.
I need your help



Bastian

 

[hvyman]

What were the clearances for the rods and mains?

 

[Slash200]

the journals are grounded to the next undersize with undersize bearings. And this is 5000 miles ago. The clearance should be good.

 

[SupraBro]

hmmm...mine kinda sounds like that too when it gets warm. i was thinking maybe a loud oil pump??? mine has done it since day one and i have been driving the hell out of it!!

 

[Slash200]

hey brgrubbs24,
i got it from first day too, but the engine runs normal,! My Pump and the drive for the pump are new. But maybe the clearance from the oilpumpdrive is not good.. hm

 

[SupraBro]

does it only do it at idle??? does it get louder when you rev?? i can only hear mine at idle...

 

[CyFi6]

Sounds normal to me :dunno:

http://www.youtube.com/watch?v=DXIGkwjhrW8

Theres a clip of my NA running, I was concerned about the light clacking you can hear a little bit, but even that wasn't a problem, engine is still running today to my knowledge (sold it).

 

[Poodles]

Sounds more like an exhaust leak or something rattling. Doesn't sound like a knock to me...

 

[Slash200]

i only hear it at idle. I cant hear it when i'm reving
cyfi6: thats exact the same noise
poodles: but if there is something broken on my exhaust, why can i only hear it when the oil is hot

 

[Poodles]

Engine gets hot, parts expand all over the engine. If it's a knock, it's knocking on more than one with it being that rapid...

 

[grimreaper]

My forged bottom end sounds similar. only at idle. Bit of a "lighter" sound then before. guessing lighter rods/pistons might have that effect.

Mine got tore down after only a few miles a few months back due to a rattle under the accel to deccel shift on throttle lift off. Rod bearings had no noticeable wear. Idle sound the same as it does now, similar to the video. funky wear on the mains though but thats another story..