2002 LS1 (used) knocks on first startup
Thread Starter
Teching In
Joined: Nov 2010
Posts: 21
Likes: 0
From: Portland, Oregon
2002 LS1 (used) knocks on first startup I'm trying to resolve a knock in my engine. I've been getting help from members at TGO in this thread:
http://www.thirdgen.org/techboard/lt...ns-knocks.html
but maybe my questions more appropriately belong here.
That thread chronicles how it sounded wrong when it first fired:
and how I ended up pulling the heads (after pulling the pan and checking rod bearings) to find this:
The rings looks to be intact, and there is a wide shallow gouge on the cylinder wall opposite the piston damage. Valves appear fine.
So my question for experienced LS1 owners is this: As bad as that looks, would it cause the knock heard in the video?
http://www.thirdgen.org/techboard/lt...ns-knocks.html
but maybe my questions more appropriately belong here.
That thread chronicles how it sounded wrong when it first fired:
and how I ended up pulling the heads (after pulling the pan and checking rod bearings) to find this:
The rings looks to be intact, and there is a wide shallow gouge on the cylinder wall opposite the piston damage. Valves appear fine.
So my question for experienced LS1 owners is this: As bad as that looks, would it cause the knock heard in the video?
It more than likely has something broken in the valvetrain. Sounds just like my buddys car when a rocker lost all the needle bearings.
All the cars I have seen lose a ringland have ran decent -1 cylinder. My friend drove his car 70 miles home from the track with a broken ringland. Other than a slight miss and a back fire it ran as quiet as before.
All the cars I have seen lose a ringland have ran decent -1 cylinder. My friend drove his car 70 miles home from the track with a broken ringland. Other than a slight miss and a back fire it ran as quiet as before.
Thread Starter
Teching In
Joined: Nov 2010
Posts: 21
Likes: 0
From: Portland, Oregon
So far the valvetrain looks fine. I pulled the rockers and pushrods and they were fine. I pulled the heads off to replace the lifters when I found the busted piston.
I figured I had found my problem, but yeah, I wondered if it would actually cause a knocking noise or not.
Has anyone ever had a busted piston like this cause a discernible knock from the engine?
I figured I had found my problem, but yeah, I wondered if it would actually cause a knocking noise or not.
Has anyone ever had a busted piston like this cause a discernible knock from the engine?
