ls3 Engine Knock at 8,000 miles ???
ls3 Engine Knock at 8,000 miles ??? Diagnostic question for ya guys...I have a built 2009 c6 with 8,000 miles on the motor. TEA ls3 heads, fast intake, and vengeance stage 3 ls3 cam with all supporting mods all built by vengeance. Build has about 6k on the the engine. Car is never abused and NEVER TAKEN TO HIGH rpms, completely babied...On the way home from work the other night i noticed over the radio and tick and a knock and it wont go away and taking to the dealer to check it out in the am. The knock is coming from the left cylinder head and makes a pretty good noise. Its not real bad when you first start it up but it gets a little louder as it runs. Oil pressure is normal, temp is normal, fluid (oil is fine) and everything else seems ok....I recently went from factory 10-30 to 10-40 about 1,000 miles ago if that could have anything to do with it. I know its hard to to tell with out hearing the noise but do you guys have any ideas on what kind of issue this could be...Im thinking maybe a lifter gone bad??? What do you guys think. Thanks for all your input.
Teching In
Joined: Jan 2007
Posts: 31
Likes: 0
That knocking noise almost sounds like what I heard on mine. Came from a bad lifter which had a flat spot on the roller. After it reached the peak lift on the lobe it started slamming down on the back profile of the lobe. Combination of high ramp rates, lift and spring pressure caused it.
Let us know but considering your mods, would warrenty really cover this? Dealers sure can get expensive. Heads need to be pulled to check lifters.
Let us know but considering your mods, would warrenty really cover this? Dealers sure can get expensive. Heads need to be pulled to check lifters.
That knocking noise almost sounds like what I heard on mine. Came from a bad lifter which had a flat spot on the roller. After it reached the peak lift on the lobe it started slamming down on the back profile of the lobe. Combination of high ramp rates, lift and spring pressure caused it.
Let us know but considering your mods, would warrenty really cover this? Dealers sure can get expensive. Heads need to be pulled to check lifters.
Let us know but considering your mods, would warrenty really cover this? Dealers sure can get expensive. Heads need to be pulled to check lifters.
I will let you know their outragious quote just for ***** and giggles.......But if it if something expensive like that i will just send it to vengeance and do some upgraded when i have the extra cash to spare.......Anyone else had this problem? 
Staging Lane
Joined: Dec 2008
Posts: 79
Likes: 0
From: Bergen, NORWAY
I have had the same problems, but my engine had run far less that this, but it is a race engine... One of the 16 lifters had a flat roller, and the Cam witch is actually a TSP Torquer v2 (Engine built in 2009 by Street Rod Engines) took some heavy damage. I have not blamed eater TSP or SRE for this, they have both shown great service, and what I think in my case was a loss of oil pressure during a training session in the top of engine that caused it. There where used L92 heads with springs and rockers, and what seems to be stock lifters. See attached picture of cam and lifter.
