OH MY GOD! My TIMING CHAIN BROKE! WHAT NOW?!?!?! @ C.O.W.
OH MY GOD! My TIMING CHAIN BROKE! WHAT NOW?!?!?! THE WHOLE STORY @ CORVETTES of WESTCHESTER
For those of you who have not heard, our good friend and CF member "WelcomeToTry" aka "Cameron" had well, sort of a TIMING CHAIN MISHAP at like 7,000 RPM's....
Not the Familiar "Cameron" you all know.....
I meant this CAMERON...
Cameron calls me up and says "I'm stuck on the side of the road." so, I figured he FINALLY broke my 4.10 rear.....
NOPE!
Here is what I found when I tore into the engine....First off...When we removed the valve covers and rockers, some of the valves were stuck down...NOT GOOD.
After removing the passenger side head, here is what we found.
It isn't often that the valve leaves a "perfect circle" on the piston cause it's got to bend the valve almost 45deg to leave that kind of mark...OUCH!
HERE'S MY FAVORITE SHOT. Cameron bent ALL 16 VALVES!!! again...NOT GOOD.
GOTTA LOVE THIS ONE. Suitable for FRAMING.
Usually, pistons with longer skirts tend to bend or break after the valve smacks the piston sideways in the bore...These survived no problem and appear to be fine.
After removing the piston with the worst impact marks and thoroughly cleaning it...you can clearly see that the damage is minimal.
Here it is evident (from the previous pic) that (fortunately) the valve impacted the piston right on the edge of the "pin boss" which is considerably thicker and stronger than the hollow area just below the very thin piston deck. Had the valve impacted the deck of the piston in any other place, it would have likely cracked the piston and created much more serious problems.
Can you tell WHAT'S WRONG WITH THIS PICTURE?!?!?! (ABSOLUTELY NOTHING - SO LONG AS IT'S NOT YOUR CAR!)
VERY OBVIOUSLY!
Yes, "CAMERON" starts with the letter "C".
LS2 chains are really good...AND they're TRUE ROLLER CHAINS. BUT, This chain from CLOYES is the deal...CAMERON, I'll buy you dinner if you bust this one!
Which chain would want in your EXPENSIVE HEAD/CAM install????
The oil pump on the left is gonna get the CoW Treatment which includes internal modifications for flow improvement and increased pressure. Cameron's car sees 7,000 RPM every time he gets behind the wheel! MO-PRESSA is BETTA!!!
Introducing the latest in Corvette Fashion and Accessories (maybe Nakid Parts is gonna steal this idea from me... ) The "REMINDER KEYCHAIN". EVERY TIME YOU START YOUR CAR, EVERYWHERE YOU GO....You'll be sure to remember that...ANYTHING CAN BREAK---ANY TIME!
SO, this is where things are at right now. This week, I'll be re-assembling the bottom end, installing the new "SECRET C.O.W. CAM" , preparing the heads, and looking forward to a day off!
Some time later this week, I'll be posting up some of the other details regarding the build up and the performance mods we've got planned.
STAY TUNED! right now, it's 3am and I'm going home....
One Cow to the rescue. NICE work. Does that beautiful special chain.
That Cameron really needs will be a future, engine saver as, I think he like push it
a bit . Fit with out any modifcations? So much for the weak "two piece Valves" HUH! None broke!
Last edited by Rock'n Blue 08; 07-25-2008 at 04:14 AM.
Have you thought about putting rubber valves in just in case this problem happens again?
Rubber valves will not cause damage to the pistons. It would have to be a a special synthetic rubber, since I don't think used tire tread rubber will take the heat.
Location: Objects in your mirror are losing , Long Island, NY
Whoooly cow, hey Chuck when you said you were going to post some pictures on the build I didn't think you meant my mug shot..
Thanks for posting, I especially like the double roller, looks massive compared to the stock one. I also like my new key chain. Thanks for your time and effort Chuck.
Last edited by welcome2try; 07-24-2008 at 08:38 AM.
Location: Objects in your mirror are losing , Long Island, NY
Quote:
Originally Posted by mvcrash
I asked on the other thread, but here goes. Are you putting valves back in those heads without machining?
Hi Jeff
If it's machining of the heads you are referring to yes, they are being fully ported and milled to the tune of 11.5 compression. Chuck will post pics when they are done.
Maybe I'm oldfashioned, but in my world a piston and valve touching equals replacing that piston or pistons at minimum. For the cost of LS2 pistons or a nice set of forged units, I don't see the advantage to not replacing them to be on the safe side. The motor is apart already and it would be a piece of cake to do it. Just my 2 cents though.
Location: Objects in your mirror are losing , Long Island, NY
Quote:
Originally Posted by bad427
Maybe I'm oldfashioned, but in my world a piston and valve touching equals replacing that piston or pistons at minimum. For the cost of LS2 pistons or a nice set of forged units, I don't see the advantage to not replacing them to be on the safe side. The motor is apart already and it would be a piece of cake to do it. Just my 2 cents though.
Ed
Chuck felt that the pistons are in very good shape, due to the area of impact on the piston. I personally was not budgeted for a whole new rebuild and this mishap. I am fortunate enough here to have the labor covered by chuck.
My decision on the rebuild and staying with the current pistons was scrutinized by me and chuck and I personally made the decision to stay with the current short block.
If I were to build a short block it would be a 416 stroker, which alone would run around $5000. Obviously with the increase in cubes and drastic change with power, other areas need to be addressed for longevity (new clutch, stronger rear end) which at this particular time is not a prudent move on my part. You are not old-fashioned in your thought process I appreciate your input.
Last edited by welcome2try; 07-25-2008 at 09:05 PM.
Chuck felt that the pistons are in very good shape, due to the area of impact on the piston. I personally was not budgeted for a whole new rebuild and this mishap. I am fortunate enough here to have the labor covered by chuck at no cost to me..
My decision on the rebuild staying with the current pistons was scrutinized by me and chuck and I personally made the decision to stay with the current short block.
If I were to build a short block it would be 416 stroker, which alone would run around $5000. Obviously with the increase in cubes and drastic change with power, other areas need to be addressed for longevity (new clutch, stronger rear end) which at this particular time is not a prudent move on my part. You are not oldfashioned in your thought process I appreciate your input.
Cameron, The keychain alone is worth it. Thats your good luck charm.
Chuck said he was going to post the progress of your rebuild. It looks like he is off to a good start. Ill be watching and planning as this is the
prototype that will fly. Is Spin going to port the FAST before he makes
the move to CO. ?
Location: ECS Sales and Support, ECSRacing Cream Ridge, New Jersey
Quote:
Originally Posted by welcome2try
Chuck felt that the pistons are in very good shape, due to the area of impact on the piston. I personally was not budgeted for a whole new rebuild and this mishap. I am fortunate enough here to have the labor covered by chuck at no cost to me..
My decision on the rebuild staying with the current pistons was scrutinized by me and chuck and I personally made the decision to stay with the current short block.
If I were to build a short block it would be 416 stroker, which alone would run around $5000. Obviously with the increase in cubes and drastic change with power, other areas need to be addressed for longevity (new clutch, stronger rear end) which at this particular time is not a prudent move on my part. You are not oldfashioned in your thought process I appreciate your input.
Good luck with the rebuild. I was wondering why you didnt go forged, but this explains it. When my double roller timing chain went I already was planning on doing something else knowing that a track car engine wasnt going to last forever so funds were already put on the side for my forged LS7 setup. If not for having that money in reserve I might have gone another route with my setup.
I also consider myself lucky that mine went on the very last track day schedule in October so I didnt lose any of the precious warm months we have. I know you it probably eating away at you not being able to drive the vette right now, but it looks like you will be up and running soon.
Location: Objects in your mirror are losing , Long Island, NY
Quote:
Originally Posted by LSCHLEM
Cameron, The keychain alone is worth it. Thats your good luck charm.
Chuck said he was going to post the progress of your rebuild. It looks like he is off to a good start. Ill be watching and planning as this is the
prototype that will fly. Is Spin going to port the FAST before he makes
the move to CO. ?
I was hoping he could port match. He is leaving I believe next monday, if the heads get back by tomorrow, he might be able to, if not, he will port them another time in the future once he is settled in Colorado. It's alright, she was running strong before, with porting and milling the heads, I can live with some additional HP .
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OH MY GOD! My TIMING CHAIN BROKE! WHAT NOW?!?!?! @ C.O.W.
) The "REMINDER KEYCHAIN".
right now, it's 3am and I'm going home....
Call NOW to reserve your AutoCal today!
. Fit with out any modifcations? 
So much for the weak "two piece Valves" HUH! None broke!
Thanks for your time and effort Chuck.
