MindIfISmoke?
Wrecking Crew
Car did not over heat. Hole in number 7 ill post pics soon
MindIfISmoke's? Built Part 3.
- Thread starter MindIfISmoke?
- Start date
Backroad_Beast
2007 Torch Red GT
God damn sorry dude, that sucks.
ZmanM3
The Evil One
Sorry about your motor.
GerRod
Member
Damn ... Sorry to hear that.
ctt326
Brenspeed Hater
wtf happened?
AnotherS197GT
Serial Valve Dropper
Man, thats so fucking shitty.
MindIfISmoke?
Wrecking Crew
I'm not to happy right now.
garner
Senior Member
Do you have the rest of those pistons that you had to get before?
MindIfISmoke?
Wrecking Crew
Nope.. they were different anyway
rford426
Resident 5.0 H8R
Damn dude....!
BruceH
BBB Big Bore Boss 322
Not all of them. The Saleen cp pistons are all 4032. They used 4032 to run tighter piston to bore clearances for less cold motor noise. Ford also uses and used Mahle 4032 pistons in the Terminator, GT500, GT, and aluminator motors. The Brenspeed cp pistons that were used this time around were also 4032.
rford426
Resident 5.0 H8R
That pump gas let you down ! What's your next move?
BruceH
BBB Big Bore Boss 322
This from engine builder magazine on holes in pistons:
Uncovering the Causes of Burned or Scuffed Pistons
A burned piston will typically have a melted appearance, or a hole burned completely through the top of the piston. The underlying cause is usually detonation and/or pre-ignition.
By Larry Carley
Question: My engine burned a piston. What does that mean and why did it happen?
Answer: It means the piston failed due to excessive heat in the combustion chamber. A burned piston will typically have a melted appearance, or a hole burned completely through the top of the piston. Aluminum can only withstand so much heat, and when it gets too hot, it melts. The underlying cause is usually detonation and/or pre-ignition.
Detonation occurs when the temperature and pressure inside a cylinder exceed the fuel’s octane rating. Instead of igniting when the spark plug fires, the air/fuel ignites spontaneously much like a diesel engine. This creates multiple flame fronts within the combustion chamber that collide and hammer the top of the piston, producing a metallic knocking noise called “spark knock.”
Common causes of detonation include a buildup of carbon deposits in the combustion chamber and on the top of the piston that increase compression, no EGR (exhaust gas recirculation), overadvanced ignition timing, a bad knock sensor, a lean fuel mixture, low quality gasoline that does not meet minimum octane requirements, or any cooling problems that causes the engine to run hotter than normal (coolant leak, low coolant level, bad water pump, stuck thermostat, restricted radiator, defective cooling fan, even exhaust restrictions that back up heat into the engine.
Pre-ignition occurs if a hot spot develops in the combustion chamber that ignites the air/fuel mixture before the spark plug fires. The hot spot may be the spark plug itself, an overheated exhaust valve, carbon deposits in the combustion chamber, or a sharp edge in the combustion chamber.
Common causes of pre-ignition include the wrong heat range spark plugs (too hot for the application), carbon deposits in the combustion chamber and on the tops of the pistons, a lean fuel mixture, detonation or anything that makes the engine run hotter than normal.
On engines that are turbocharged or supercharged, too much boost pressure and/or not enough fuel can burn a piston very quickly. Check the operation of the wastegate and boost control system. If the turbo system has been tweaked to deliver higher than stock boost pressure for more power, the turbo may be pushing more air into the engine than the stock injectors can handle, causing the fuel mixture to lean out and burn the piston.
An often overlooked cause of piston burning is a weak or dirty fuel injector. If an injector is not spraying enough fuel into the combustion chamber, the air/fuel mixture in that cylinder may become too lean increasing the risk of detonation, pre-ignition and piston damage.
Installers may diagnos the problem using a scan tool to check for lean codes and to look at fuel trim values. If a P0171 or P0174 code is found, or the long term fuel trim readings are 10 or higher (indicating a lean mixture), the engine may have one or more weak or dirty injectors.
The only way to know for sure is to remove the injectors, clean them on a fuel injector cleaning machine, then flow test all the injectors and compare the results. Any injector that does not flow within 5 to 8 percent of the rest should be replaced.
Edit: I'm wondering what the stoich was of the 101 octane fuel.
Uncovering the Causes of Burned or Scuffed Pistons
A burned piston will typically have a melted appearance, or a hole burned completely through the top of the piston. The underlying cause is usually detonation and/or pre-ignition.
By Larry Carley
Question: My engine burned a piston. What does that mean and why did it happen?
Answer: It means the piston failed due to excessive heat in the combustion chamber. A burned piston will typically have a melted appearance, or a hole burned completely through the top of the piston. Aluminum can only withstand so much heat, and when it gets too hot, it melts. The underlying cause is usually detonation and/or pre-ignition.
Detonation occurs when the temperature and pressure inside a cylinder exceed the fuel’s octane rating. Instead of igniting when the spark plug fires, the air/fuel ignites spontaneously much like a diesel engine. This creates multiple flame fronts within the combustion chamber that collide and hammer the top of the piston, producing a metallic knocking noise called “spark knock.”
Common causes of detonation include a buildup of carbon deposits in the combustion chamber and on the top of the piston that increase compression, no EGR (exhaust gas recirculation), overadvanced ignition timing, a bad knock sensor, a lean fuel mixture, low quality gasoline that does not meet minimum octane requirements, or any cooling problems that causes the engine to run hotter than normal (coolant leak, low coolant level, bad water pump, stuck thermostat, restricted radiator, defective cooling fan, even exhaust restrictions that back up heat into the engine.
Pre-ignition occurs if a hot spot develops in the combustion chamber that ignites the air/fuel mixture before the spark plug fires. The hot spot may be the spark plug itself, an overheated exhaust valve, carbon deposits in the combustion chamber, or a sharp edge in the combustion chamber.
Common causes of pre-ignition include the wrong heat range spark plugs (too hot for the application), carbon deposits in the combustion chamber and on the tops of the pistons, a lean fuel mixture, detonation or anything that makes the engine run hotter than normal.
On engines that are turbocharged or supercharged, too much boost pressure and/or not enough fuel can burn a piston very quickly. Check the operation of the wastegate and boost control system. If the turbo system has been tweaked to deliver higher than stock boost pressure for more power, the turbo may be pushing more air into the engine than the stock injectors can handle, causing the fuel mixture to lean out and burn the piston.
An often overlooked cause of piston burning is a weak or dirty fuel injector. If an injector is not spraying enough fuel into the combustion chamber, the air/fuel mixture in that cylinder may become too lean increasing the risk of detonation, pre-ignition and piston damage.
Installers may diagnos the problem using a scan tool to check for lean codes and to look at fuel trim values. If a P0171 or P0174 code is found, or the long term fuel trim readings are 10 or higher (indicating a lean mixture), the engine may have one or more weak or dirty injectors.
The only way to know for sure is to remove the injectors, clean them on a fuel injector cleaning machine, then flow test all the injectors and compare the results. Any injector that does not flow within 5 to 8 percent of the rest should be replaced.
Edit: I'm wondering what the stoich was of the 101 octane fuel.
Last edited:
garner
Senior Member
I gotta say it might be time to drop the boost down, go back na, or go to another platform like a 5.0
05stroker
Never enough power guy!
Was this on 93 oct. pump or race gas with 10.5 cr and a boost spike tp 20 psi ?
rford426
Resident 5.0 H8R
Pretty sure it was pump as he was trying to "push the limits of pump gas" in a earlier thread
BruceH
BBB Big Bore Boss 322
I talked to Matt earlier. It was 101 fuel, 9.8 cr, and 16psi on the boost controller. I forgot to ask about the 20lb spike dietcoke mentioned. He said the hole was in proximity to the exhaust valve.
rford426
Resident 5.0 H8R
Ok I thought he was still going on pump gas! Thanks for clarifying! I wanna know how it spiked so bad...if the boost controller failed it would go off spring pressure as buzzlightyear brought up to me!?!?!
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