Ed Blown Vert

iTrader: (2)

Well, after the 1/8 mile track. Starting hearing another noise. Idle is a bit rough. But runs strong.

Knock Any ideas?

LSONE

iTrader: (1)

sounds like its time to pull the valve covers and check things out, shouldnt take too long.

Ed Blown Vert

iTrader: (2)

I plan on it, just trying to figure out what it is.

Bad30th

iTrader: (13)

I heard this noise in person on Sunday, it's not as hollow sounding as bottom-end rod knock I've heard before (spun main bearing). ...although I've never heard anything make this specific noise before...

We're pretty sure it's not the crank pulley/bolt as we verified it was pretty tight...

Things I just though of - how's your oil pressure ? Any fluctuation in oil pressure when the noise happens ? Any metal on your oil drain plug ?

I'd definately look at/verify the top end first Ed...

Rob (Bad30th)

Ed Blown Vert

iTrader: (2)

Yep, I don't think it was the crank bolt. But I will double check it again.

Oil Pressure is fine. Its actually a bit higher since the install.

I will be pulling the valve covers off tonight.

I am wondering if it could be lifters....

Ed Blown Vert

iTrader: (2)

The valvetrain looks fine. So I am guessing it still may be the crank pulley.

strokedls1

iTrader: (1)

Didn't sound like anything specific. I would check some of the plugs to see how they are running. Check for misfires on the computer also to try to narrow it down.

Z-286speed

I am just throwing this out there, cam bearings?

Ed Blown Vert

iTrader: (2)

No misfires. Plugs look fine.

strokedls1

iTrader: (1)

That top right one #7 I assume looks like it got a little hotter than the rest. What is all the dirt on that plug? How is the coolant level in the radiator?

Ed Blown Vert

iTrader: (2)

Not sure what the dirt is, but looks green in color. I am losing coolant. But I think that was caused by a leaky thermostat housing.