What could cause this?(Pic Inside)

QMSolutions · May 19th, 2009, 06:21 PM

Originally Posted by Jakashh

^^hey do you still have my rear brake pads?

Sitting on my desk. I noticed them 5 min after you left yesterday.

Dolbs4082 · May 19th, 2009, 06:23 PM

looks to me like a detonation, my car did the same thing about 6 months before i tore the motor down. didnt realize that it had happen. Did u by any chance have to replace a spark plug here any time recently? because when mine broke loose, it threw that chunk of piston into the spark plug and crushed the tip causin the motor to misfire and die.

i replaced the plug and drove her for almost 6 months and nothing bad happen haha. but i would say it was a detonation?

Jakashh · May 19th, 2009, 06:24 PM

Originally Posted by QMSolutions

Sitting on my desk. I noticed them 5 min after you left yesterday.

oh yeah what did you do about those clips that new guy was talking about that was holding the pad to my rotor?

Trick Tuners · May 19th, 2009, 06:55 PM

What did the plugs look like? I would suspect detonation, or meth injection.

JayC · May 20th, 2009, 12:05 AM

Originally Posted by Quick99

Detonation?

We have a winner

jivepepper · May 20th, 2009, 12:13 AM

Originally Posted by Quick99

Detonation?

Originally Posted by JayC

We have a winner

mig4236 · May 20th, 2009, 01:37 AM

Originally Posted by QMSolutions

Due to detonation, the ring more than likely broke causing the damage to the piston. I have a Cobra sitting here with the same problem. His car ran way lean because of a vacuum leak. Now building him a new forged block.

That sounds abt right the piston rings were all messed up. Now I have to buy some new pistons. If I remember, Is that the silver cobra that got messed up on the dyno? Now it happened to me.

mig4236 · May 20th, 2009, 01:40 AM

Originally Posted by Trick Tuners

What did the plugs look like? I would suspect detonation, or meth injection.

The plugs look ok except for 1 of them, it was burned. I was runnig methanol injection.

99cobra! · May 20th, 2009, 09:33 AM

hey man, I have some CP pistons up for sale and the piston rings, forged and 17cc, puts your compression ratio right around 8.67:1 if you are interested.

rodeheavers · May 20th, 2009, 09:41 AM

dude, she went lean or detonated and melted the piston, the edges are the thinnest so they usually go first.. seen it a hundred times.. and thats not were the valves would hit if they would have hit..

jivepepper · May 20th, 2009, 11:04 AM

Originally Posted by 99cobra!

hey man, I have some CP pistons up for sale and the piston rings, forged and 17cc, puts your compression ratio right around 8.67:1 if you are interested.

That's funny mmr told me with stock heads and 18cc it's around 9 flat.

99cobra! · May 20th, 2009, 11:47 AM

Originally Posted by jivepepper

That's funny mmr told me with stock heads and 18cc it's around 9 flat.

It is also funny that 8.5:1 to 8.67:1 is what it is listed, 18cc pistons on a 5.0L stroker will be 9 falt.
Maybe that is what you meant?

Trick Tuners · May 20th, 2009, 12:05 PM

Originally Posted by mig4236

I was runnig methanol injection.

This has been coming up more and more. Some cylinders are fine, and some are ruined by detonation. This is caused by a non-homogeneous distribution of the meth/ water. (not getting the same mixture to all cylinders). This is by far the best argument to run an IC instead of meth.

jivepepper · May 20th, 2009, 01:30 PM

Originally Posted by 99cobra!

It is also funny that 8.5:1 to 8.67:1 is what it is listed, 18cc pistons on a 5.0L stroker will be 9 falt.
Maybe that is what you meant?

I have a MMR 900 and with stock 2v heads the 18cc is around 9 flat. On a 4.6 4v it's around 8.5:1

superbeef1000 · May 20th, 2009, 04:29 PM

bad ring gap

mig4236 · May 21st, 2009, 04:01 AM

Originally Posted by Trick Tuners

This has been coming up more and more. Some cylinders are fine, and some are ruined by detonation. This is caused by a non-homogeneous distribution of the meth/ water. (not getting the same mixture to all cylinders). This is by far the best argument to run an IC instead of meth.

That makes good sense it coulve been that. If coolant goes to the spark plugs does it go to the cylinders? I remember 1 day I broke a hose and coolant was flying everywhere.

May 19th, 2009, 06:55 PM	#24
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	What did the plugs look like? I would suspect detonation, or meth injection. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

May 20th, 2009, 09:33 AM	#29
99cobra! Regular 1999 Mustang Cobra Not Yet Join Date: Oct 2008 Location: North Carolina Posts: 255 iTrader: 0 reviews	hey man, I have some CP pistons up for sale and the piston rings, forged and 17cc, puts your compression ratio right around 8.67:1 if you are interested. __________________ MM COBRA CLUB #19 "Real cars aren't powered by their front wheels, they lift them"

May 20th, 2009, 09:41 AM	#30
rodeheavers Regular 1981 4 EYED FREAK 9.48@147 Join Date: Mar 2009 Location: southwestern pa Posts: 329 iTrader: 0 reviews	dude, she went lean or detonated and melted the piston, the edges are the thinnest so they usually go first.. seen it a hundred times.. and thats not were the valves would hit if they would have hit.. __________________ www.rodeheavershotrod.com 9.48@147 on pump gas through the mufflers, still has pw,tilt,t-tops,all lights, wipers!!!, check out the vid http://www.youtube.com/watch?v=SloE3Zdetac

May 20th, 2009, 04:29 PM	#35
superbeef1000 Hardcore Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 1,475 iTrader: 2 reviews	bad ring gap __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

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May 19th, 2009, 06:23 PM	#22
Dolbs4082 I Post Entirely Way Too Much 2005 Mustang GT Join Date: Dec 2008 Location: kansas Posts: 5,394 iTrader: 0 reviews	looks to me like a detonation, my car did the same thing about 6 months before i tore the motor down. didnt realize that it had happen. Did u by any chance have to replace a spark plug here any time recently? because when mine broke loose, it threw that chunk of piston into the spark plug and crushed the tip causin the motor to misfire and die. i replaced the plug and drove her for almost 6 months and nothing bad happen haha. but i would say it was a detonation?

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