jeremy00ss

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

steve

prolly...

did you get another chain on it yet?
if so, its easy to find out if you have compression

steve frank

wizkid

iTrader: (3)

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>

Pro Stock John

iTrader: (34)

I think you bent a lot of valves.

I broke a timing chain.

AlonzoVersion 1.0

Maybe maybe not.Do a compression test on the motor.

MelloYellow

99% you bent all of them.

GeorgeC

</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" />

wizkid

iTrader: (3)

Never mind my mod question I see that you have a stock engine.

Do you run the bottle?

Eric

Pro Stock John

iTrader: (34)

I bent all the intake valves and I was only at 3500 rpms. I was told that at WOT the damage would be even worse.

TRYMYZ

iTrader: (2)

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>

MelloYellow

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>

MyLS1Hauls

iTrader: (2)

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>

Pro Stock John

iTrader: (34)

My damage was all to the valves.

kewlbrz

</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.

MelloYellow

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.