snapped timing chain. did I bend valves
Thread Starter
Teching In
Joined: Jun 2002
Posts: 5
Likes: 0
From: preston ct
snapped timing chain. did I bend valves Is the ls1 an interference engine. Timing chain snapped at close to redline. Will the valves hit the pistons? My engine is stock.
Thanks, Jeremy
Thanks, Jeremy
Re: snapped timing chain. did I bend valves Yeah, the LS1 is an interference motor. Ask those of us who have missed a shift. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
That stinks man <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> , did you have many mod'd on your car?
Eric
<small>[ June 17, 2002, 03:19 PM: Message edited by: wizkid ]</small>
That stinks man <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> , did you have many mod'd on your car?
Eric
<small>[ June 17, 2002, 03:19 PM: Message edited by: wizkid ]</small>
TECH Junkie
Joined: Nov 2001
Posts: 3,987
Likes: 0
From: Melbourne, FL
Re: snapped timing chain. did I bend valves </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by MelloYellow:
<strong>99% you bent all of them.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I doubt they're all bent. When the chain snaps, the cam stops turning. Any valve that are off the seats enough are gonna be bent though. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
<strong>99% you bent all of them.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I doubt they're all bent. When the chain snaps, the cam stops turning. Any valve that are off the seats enough are gonna be bent though. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Re: snapped timing chain. did I bend valves I was at 2200 rpm and bent 5 valves. 99% of the time you bend at least one valve.
John
<small>[ June 18, 2002, 11:16 AM: Message edited by: TRYMYZ ]</small>
John
<small>[ June 18, 2002, 11:16 AM: Message edited by: TRYMYZ ]</small>
TECH Fanatic
Joined: Nov 2001
Posts: 1,986
Likes: 1
From: Centrifugal City
Re: snapped timing chain. did I bend valves Mine went out around 5500 RPM. 8 were bent like dog legs, the other 8 were bent minorly but all still needed replacement.
<small>[ June 18, 2002, 01:21 PM: Message edited by: MelloYellow ]</small>
<small>[ June 18, 2002, 01:21 PM: Message edited by: MelloYellow ]</small>
Re: snapped timing chain. did I bend valves So, when the chain breaks and the valves and pistons meet up, what happens to the rest of the motor? Shattered, or just badly damaged pistons? I'm a little concerned with this happening, but probably not enough to invest in a $300+ Katech/comp setup. I will be using a small cam. BTW, who here has broken a chain with the stock harmonic dampener?
Brad
<small>[ June 18, 2002, 05:02 PM: Message edited by: MyLS1Hauls ]</small>
Brad
<small>[ June 18, 2002, 05:02 PM: Message edited by: MyLS1Hauls ]</small>
On The Tree
Joined: Nov 2001
Posts: 191
Likes: 1
From: Dallas, TX
Re: snapped timing chain. did I bend valves </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jeremy00ss:
<strong>Is the ls1 an interference engine. Timing chain snapped at close to redline. Will the valves hit the pistons? My engine is stock.
Thanks, Jeremy</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Youll need to pull the heads or get fancy with a small camera tool into the spark plug holes to be sure what exactly happened. Anything else is pure speculation. Go in expecting to replace pistons and valves, and possible some head repair.
I feel for ya.
<strong>Is the ls1 an interference engine. Timing chain snapped at close to redline. Will the valves hit the pistons? My engine is stock.
Thanks, Jeremy</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Youll need to pull the heads or get fancy with a small camera tool into the spark plug holes to be sure what exactly happened. Anything else is pure speculation. Go in expecting to replace pistons and valves, and possible some head repair.
I feel for ya.
TECH Fanatic
Joined: Nov 2001
Posts: 1,986
Likes: 1
From: Centrifugal City
Re: snapped timing chain. did I bend valves You'll have valve marks/reliefs on the top of all your pistons now. Pistons and ringlands 'should' be ok.
New valves after pulling the heads. Will need to be 'lapped' in. Low chance of possible valve seat damage.
FWIW, I spun a bearing 3-4 months later, so who knows what it does to the bottom end. Not sure if low oil pressure is always a pump failure or a symptom of a damaged bearing progressively getting worse. My oil pressure dropped slowly over the next 2-3 months, then catastophically fell from 25psi to nothing one day.
Spun a bearing, threw a rod thru the block.
New valves after pulling the heads. Will need to be 'lapped' in. Low chance of possible valve seat damage.
FWIW, I spun a bearing 3-4 months later, so who knows what it does to the bottom end. Not sure if low oil pressure is always a pump failure or a symptom of a damaged bearing progressively getting worse. My oil pressure dropped slowly over the next 2-3 months, then catastophically fell from 25psi to nothing one day.
Spun a bearing, threw a rod thru the block.
