OH MY GOD! My TIMING CHAIN BROKE! WHAT NOW?!?!?! @ C.O.W.
07-24-2008, 03:13 AM
#1
Former Vendor
Thread Starter
Member Since: Nov 2005
Location: Ossining New York
Posts: 11,792
Received 243 Likes
on
183 Posts
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
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.... Chuck CoW
07-24-2008, 03:40 AM
#3
Team Owner
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!
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 3 Z06ZR1; 07-25-2008 at 03:14 AM.
07-24-2008, 06:42 AM
#5
Race Director
Member Since: Aug 2005
Location: Hudson WI
Posts: 13,598
Received 181 Likes
on
162 Posts
NCM Sinkhole Donor
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.
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.
07-24-2008, 07:33 AM
#7
Safety Car
Member Since: Jul 2006
Location: Objects in your mirror are losing , Long Island, NY
Posts: 4,647
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08
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.
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 07:38 AM.
07-24-2008, 07:38 AM
#8
Safety Car
Member Since: Jul 2006
Location: Objects in your mirror are losing , Long Island, NY
Posts: 4,647
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08
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.
07-24-2008, 07:41 AM
#9
Advanced
Member Since: Aug 2007
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
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
Ed
07-24-2008, 07:57 AM
#10
Safety Car
Member Since: Jul 2006
Location: Objects in your mirror are losing , Long Island, NY
Posts: 4,647
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08
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
Ed
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 08:05 PM.
07-24-2008, 08:19 AM
#12
Melting Slicks
Member Since: Sep 2007
Location: READING PA
Posts: 2,597
Likes: 0
Received 3 Likes
on
3 Posts
St. Jude Donor '08-'09-'10
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.
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.
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. ?
07-24-2008, 08:24 AM
#13
Team Owner
Member Since: Jul 2004
Location: NJ
Posts: 24,652
Received 297 Likes
on
94 Posts
St. Jude Donor '05-'08
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.
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.
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.
Again it sucks, but it could be a lot worse.
07-24-2008, 08:48 AM
#15
Safety Car
Member Since: Jul 2006
Location: Objects in your mirror are losing , Long Island, NY
Posts: 4,647
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08
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. ?
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. ?
.
07-24-2008, 09:05 AM
#16
Le Mans Master<br><img src="/forums/images/ranks/5k-6k.gif" border="0">
Member Since: May 2007
Posts: 5,399
Likes: 0
Received 0 Likes
on
0 Posts
St. Jude Donor '08-'09
You going to at least magnaflux those pistons, right? There could be damage that can't be seen with the nakid eye.
BTW, nice job Chuck!
Cameron- Can you PM me Chuck's cell phone number?
BTW, nice job Chuck!
Cameron- Can you PM me Chuck's cell phone number?
07-24-2008, 09:41 AM
#17
Premium Supporting Vendor
Member Since: Oct 2004
Location: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Posts: 23,316
Received 1,085 Likes
on
656 Posts
Chuck, you have a lot of time on your hands!
btw, you can definately break a double roller timing chain the same way.
btw, you can definately break a double roller timing chain the same way.
07-24-2008, 09:47 AM
#18
Safety Car
Member Since: Jan 2006
Location: Miami FL
Posts: 4,598
Received 69 Likes
on
45 Posts
2020 C6 of the Year Finalist - Unmodified
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16,'17,'18-'19-'20-'21-'22
You going to at least magnaflux those pistons, right? There could be damage that can't be seen with the nakid eye.
Fluorescent dye penetrant might not be a bad idea, though.
