Sure, I'll take some FI to go with all my N/A mods - Page 21 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

10-06-2012, 10:57 PM

Quote:

Originally Posted by BaylorCamaro

Well I was between 1/8 & 1/4 so I wasnt pegged on E. My point was I wasnt on a full tank so the weight of extra gas was not an issue.

Sent from my SAMSUNG Galaxy S III using telekinesis.

Gotcha.. Remove that possibility from the list.

Vince can also tell if you are overrunning the high pressure pump.

Stay tuned for further updates and better track times.

BaylorCamaro · 02-05-2013, 07:19 PM

WELL I was hoping this thread wasn't going to pop up again. At least not like this.

I heard a weird rattle coming from the engine bay earlier today. Once I got home I used an automotive stethoscope to pin the location of the sound down to the tensioner bracket and found this.

My guess is a stress fracture, just like what happened to the bolt that snapped off the tensioner a few months ago. The real salt in the wound is I haven't even been to the drag strip since I got my car back from RX. Even worse, aside from two Saturdays ago I haven't even taken my car past 4,000 RPMs (drive to work is only 5.5 miles in the city). Tensioner is hardly holding any tension on the belt.

Just spoke with Tracy, looks like he has a different bracket (1/2 billet). Stay tuned.

scrming · 02-05-2013, 07:25 PM

dang... sorry to see that...

GretchenGotGrowl · 02-05-2013, 07:39 PM

Crap man, you have had a battle with everything.

KMPrenger · 02-05-2013, 07:43 PM

More Bad news?? That sucks man...hope you get it worked out.

BaylorCamaro · 02-05-2013, 07:50 PM

Thanks guys...

Quote:

Originally Posted by GretchenGotGrowl

Crap man, you have had a battle with everything.

Yup. Getting close to understanding first hand the expression the straw the broke the camel's back..

GretchenGotGrowl · 02-05-2013, 07:56 PM

Quote:

Originally Posted by BaylorCamaro

Thanks guys...

Yup. Getting close to understanding first hand the expression the straw the broke the camel's back..

Hang in there. All the battle may make that final victory that much sweeter.

BaylorCamaro · 02-05-2013, 09:33 PM

Quote:

Originally Posted by GretchenGotGrowl

Hang in there. All the battle may make that final victory that much sweeter.

I really hope so man. With this being my daily driver, if I have any more issues I am going to have to look into alternative options as I cannot keep having these repeats.

KaBoom1701 · 02-05-2013, 11:14 PM

BaylorCamaro · 02-06-2013, 10:34 AM

Well here is the one silver lining. My current plan is to remove the tensioner bracket and bring it to my work. One aspect of our company is metallurgical testing, so I am going to have the bracket tested for hardness and try to determine the exact type of metal we are dealing with (unless Tracy knows). From that I'll be able to see if this type of metal is strong enough for the application. The next step (based on our metallurgist suggestions) is to buy an appropriate strength metal, I'm thinking Aluminum 7075. I will then have our machinist replace or build a new bracket out of the upgraded material. The end result will hopefully be something way stronger than is necessary but hopefully will never fail.

V6owner · 02-06-2013, 11:05 AM

Awesome man! Keep is posted!

BaylorCamaro · 02-06-2013, 02:41 PM

Well my bracket is 1/2" thick which means it must be your updated bracket.

Over my lunch break I removed the tensioner and brought into work. Our Ph D who is head of the lab along with our metallurgist looked at it and determined the failure was a result from stress and fatigue.

This picture shows where it started. If you look at the bottom right corner, rings extend out from bottom right to upper left like a radar ping which explains the origin point of the failure.

However if you look at the below picture you can see the the bracket was cut to accommodate the shape of the tensioner. It appears it wasn't machined in this shape and because of that there is a possibility it introduced a defect. Which makes sense since the fatigue originates right at the center of the cut.

In conclusion the break resulted from fatigue / stress fracture. However whether or not that was because of the quality of the metal isn't determinable unless a full failure analysis is performed. It IS possible that the way the bracket piece was cut rather than being machined introduced a defect, such as a hair line fracture.

Sent from my SAMSUNG Galaxy S III using telekinesis.

V6owner · 02-06-2013, 03:22 PM

That does look half inch thick

BaylorCamaro · 02-06-2013, 03:24 PM

It is, used measuring calipers. Technically it is .499 but basically half inch.

Sent from my SAMSUNG Galaxy S III using telekinesis.

02-05-2013, 07:19 PM	#282
BaylorCamaro Track > 1/4 Mile Drives: 2016 C7 Z51 Join Date: Sep 2009 Location: League City, TX Posts: 6,072 View My Garage	WELL I was hoping this thread wasn't going to pop up again. At least not like this. I heard a weird rattle coming from the engine bay earlier today. Once I got home I used an automotive stethoscope to pin the location of the sound down to the tensioner bracket and found this. My guess is a stress fracture, just like what happened to the bolt that snapped off the tensioner a few months ago. The real salt in the wound is I haven't even been to the drag strip since I got my car back from RX. Even worse, aside from two Saturdays ago I haven't even taken my car past 4,000 RPMs (drive to work is only 5.5 miles in the city). Tensioner is hardly holding any tension on the belt. Just spoke with Tracy, looks like he has a different bracket (1/2 billet). Stay tuned. __________________ Automotive YouTube Channel / Texas World Speedway / MSR Houston

02-05-2013, 07:25 PM	#283
scrming Red Brick of Vengeance! Drives: 12 Second Brick Join Date: Jun 2009 Location: at my pulpit Posts: 7,745	dang... sorry to see that... __________________ 2011 Ford Flex EcoBoost Limited - 12.727 @ 109.790 MPH

02-05-2013, 07:39 PM	#284
GretchenGotGrowl Drives: 11 F150 EB/13 Sonic RS/15 Z06 Join Date: Sep 2010 Location: Little Rock, AR Posts: 7,129 View My Garage	Crap man, you have had a battle with everything. __________________ New Ride -- 2015 Z06 2LZ (stock) -- Journal Old Ride -- 2012 Camaro 2LT/RS (647 RWHP & 726 RWTQ) -- Build Thread

02-05-2013, 07:43 PM	#285
KMPrenger Drives: 16 Camaro SS, 15 Colorado Join Date: May 2009 Location: Jefferson City, Missouri Posts: 13,944	More Bad news?? That sucks man...hope you get it worked out. __________________ 2016 Camaro 1SS - 8-speed - NPP - Black bowties 2010 Camaro 1LT V6 (Sold. I will miss her!)

02-06-2013, 10:34 AM	#290
BaylorCamaro Track > 1/4 Mile Drives: 2016 C7 Z51 Join Date: Sep 2009 Location: League City, TX Posts: 6,072 View My Garage	Well here is the one silver lining. My current plan is to remove the tensioner bracket and bring it to my work. One aspect of our company is metallurgical testing, so I am going to have the bracket tested for hardness and try to determine the exact type of metal we are dealing with (unless Tracy knows). From that I'll be able to see if this type of metal is strong enough for the application. The next step (based on our metallurgist suggestions) is to buy an appropriate strength metal, I'm thinking Aluminum 7075. I will then have our machinist replace or build a new bracket out of the upgraded material. The end result will hopefully be something way stronger than is necessary but hopefully will never fail. __________________ Automotive YouTube Channel / Texas World Speedway / MSR Houston

02-05-2013, 11:14 PM	#289
KaBoom1701 KaBoom1701 Drives: 13' ZL1 Red M6 Join Date: Dec 2012 Location: I.E. SoCal (Yucaipa) Posts: 8,630

02-06-2013, 11:05 AM	#291
V6owner Cedar Creek Woodshop Drives: One Badass 1LE Join Date: Mar 2011 Location: Rosenberg, TX Posts: 2,227 View My Garage	Awesome man! Keep is posted! __________________ 2014 Black 2SS/RS 1LE

02-06-2013, 02:41 PM	#292
BaylorCamaro Track > 1/4 Mile Drives: 2016 C7 Z51 Join Date: Sep 2009 Location: League City, TX Posts: 6,072 View My Garage	Well my bracket is 1/2" thick which means it must be your updated bracket. Over my lunch break I removed the tensioner and brought into work. Our Ph D who is head of the lab along with our metallurgist looked at it and determined the failure was a result from stress and fatigue. This picture shows where it started. If you look at the bottom right corner, rings extend out from bottom right to upper left like a radar ping which explains the origin point of the failure. However if you look at the below picture you can see the the bracket was cut to accommodate the shape of the tensioner. It appears it wasn't machined in this shape and because of that there is a possibility it introduced a defect. Which makes sense since the fatigue originates right at the center of the cut. In conclusion the break resulted from fatigue / stress fracture. However whether or not that was because of the quality of the metal isn't determinable unless a full failure analysis is performed. It IS possible that the way the bracket piece was cut rather than being machined introduced a defect, such as a hair line fracture. Sent from my SAMSUNG Galaxy S III using telekinesis. __________________ Automotive YouTube Channel / Texas World Speedway / MSR Houston

02-06-2013, 03:22 PM	#293
V6owner Cedar Creek Woodshop Drives: One Badass 1LE Join Date: Mar 2011 Location: Rosenberg, TX Posts: 2,227 View My Garage	That does look half inch thick __________________ 2014 Black 2SS/RS 1LE

02-06-2013, 03:24 PM	#294
BaylorCamaro Track > 1/4 Mile Drives: 2016 C7 Z51 Join Date: Sep 2009 Location: League City, TX Posts: 6,072 View My Garage	It is, used measuring calipers. Technically it is .499 but basically half inch. Sent from my SAMSUNG Galaxy S III using telekinesis. __________________ Automotive YouTube Channel / Texas World Speedway / MSR Houston