Broken timing chain question.
Thread Starter
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Joined: Jul 2002
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From: Lockport,IL
Broken timing chain question. Well racing at US41 last night at the 1000 ft mark motor just quit. Pulled the front end apart[ gotta get puller for pulley] the chain is broke there was no noise and when I crank it over theres no noise what are the chances I bent the valves? 
and whats the easiest way to tell if the valves are bent?
and whats the easiest way to tell if the valves are bent? Re: Broken timing chain question. If you broke the timing chain, it's 100% that there are bent valves and damaged pistons. If the cam stops but the crank continues to spin, some of the cylinders will be left with their valves open and the pistons will hit them.
Re: Broken timing chain question. Yup, you've definitely got some damage. Especially since the motor was running high rpm when the chain went. Hopefully it will only be valves and no damaged pistons. I've even heard of one case where some connecting rods got bent. Dont ask me how. What cam were you running? What pulley did you have on the car? I always hate these posts as I'm pressing my luck with the stock chain. Good luck to ya. Also, dont try to turn the motor over anymore...you may just end up causing more damage.
Re: Broken timing chain question. Mike, I broke a timing chain once, and I bent all the intake valves, what happened? You have a cam in the car right?
I have the pulley removal tools if you want to grab them.
I have the pulley removal tools if you want to grab them.
Thread Starter
TECH Enthusiast
Joined: Jul 2002
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From: Lockport,IL
Re: Broken timing chain question.
Mike, I broke a timing chain once, and I bent all the intake valves, what happened? You have a cam in the car right?
I have the pulley removal tools if you want to grab them.
I have the pulley removal tools if you want to grab them.
Re: Broken timing chain question.
reason Im asking is Ive had 2 cars in the past that I broke timing belts on and never hurt anything else.
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Verdad Gallardo Thread Starter
TECH Enthusiast
Joined: Jul 2002
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From: Lockport,IL
Re: Broken timing chain question. Well its confirmed chain did snap, pulled the r/side valve cover loosened up the rockers and atleast the #2 cylinder is open 3500 miles on this chain and I dyno only at 377 rwhp so what gives with this chain it shouldnt break that easy 
Thread Starter
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Joined: Jul 2002
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From: Lockport,IL
Re: Broken timing chain question.
I don't have much to say, but this is a good reminder to go with double chains (and double springs). A bit of redundancy is worth it!
Dope
Dope
Re: Broken timing chain question. Jorday, all I can say is I lost sleep at night thinking about having the stock chain so 2x Rollmaster went on when it was heads and cam time.
Tin Indian wrote
I have the double and I'm worried again 
Tin Indian wrote
Well, I have a single Rollmaster on mine too. Jeeze... Now you have me worried! 
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
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From: SW Florida
Re: Broken timing chain question. They always say; "The Rollmaster timing set comes with the Iwis Ketten chain. The best chain available"
Supposidly much better quality than the GM spec'd Renold chain.
So, what the deal with this superior chain breaking?
Supposidly much better quality than the GM spec'd Renold chain.
So, what the deal with this superior chain breaking?
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
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From: SW Florida
Re: Broken timing chain question.
What about the JWIS single chain? It is supposed to pretty strong isnt it?
BTW, the stock GM chain is produced in England by Renold.
Re: Broken timing chain question. When I did heads/cam om my '00 formula I didn't replace the stock timing chain. It broke after about a year. I haven't assessed the damage yet. should know in 4-6 weeks.
I was thinking about going with the rollmaster.
I was thinking about going with the rollmaster.
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From: Bring it........ b*tch
Re: Broken timing chain question. Wow, I'm certainly suprised to read that you broke a Rollmaster chain...... but this got me thinking (and I'm sure this has been discussed at some point before) but why is there no gear drive timing set for the LS1 from like Pete Jackson or something? I would think a billet gear drive timing set would be more reliable and less likely to break than a timing chain, but what do I know.
Anyhow, I'm glad I got the double roller...
Anyhow, I'm glad I got the double roller...
