Engine Damage at 16PSI
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Had the car on the dyno and maybe 200 miles of driving and this is the damage that was done. The car is a 2010 Camaro with a built 416ci 9.28cr engine. It made 750rwhp/800tq once but then the next pull it dropped down about 200hp so the dyno session was called off.
I pulled the plugs out and the #7 cylinder plug was missing the tip of the ground strap from just past the bend. The #5 had a little tiny bit missing and all the other plugs were intact.
Here are pics of the #7 plug and the #4.
#7
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/SparkPlug7001.jpg)
#4
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/SparkPlug4002.jpg)
A leakdown test showed 28% on the #4 piston so the head was pulled off. All the other cylinders were 0% with the exception of #7 showing 7%.
Here is #4 cylinder after the head was pulled.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Cylinder4002.jpg)
Had to pull the whole engine and tear it down. Going to have to start from square one again.
Here is the piston damage on #4.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Piston4003.jpg)
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Piston4001.jpg)
Also, the pistons on the passenger side show a lot of wear on the skirts.
I pulled the plugs out and the #7 cylinder plug was missing the tip of the ground strap from just past the bend. The #5 had a little tiny bit missing and all the other plugs were intact.
Here are pics of the #7 plug and the #4.
#7
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/SparkPlug7001.jpg)
#4
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/SparkPlug4002.jpg)
A leakdown test showed 28% on the #4 piston so the head was pulled off. All the other cylinders were 0% with the exception of #7 showing 7%.
Here is #4 cylinder after the head was pulled.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Cylinder4002.jpg)
Had to pull the whole engine and tear it down. Going to have to start from square one again.
Here is the piston damage on #4.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Piston4003.jpg)
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Piston4001.jpg)
Also, the pistons on the passenger side show a lot of wear on the skirts.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Piston4004.jpg)
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NGK BR7EF's were in there for the dyno runs but I have since then installed B8EFS's and have some B9EFS's in stock just in case. Damage is already done so a new set of plugs will go in the new engine.
We didn't even get a chance to spray the methanol, lol. Or the nitrous!
We didn't even get a chance to spray the methanol, lol. Or the nitrous!
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So did the plugs hang too deep and get beat up by the pistons or what? Very strange that the straps of 2 plugs would just fall off, seems like something wasn't accounted for.
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Weird thing is that the #7 cylinder that had the plug melt was ok and the #4 that had a complete plug is the one with all the damage.
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The engine builder thinks the passenger side was running a bit lean and the drivers side a bit rich. The injectors were supposed to be flow balanced.
The fuel system consists of three in-tank pumps with -8 lines going to a filter then to the back of the passenger fuel rail. Then a crossover to the drivers side then a -6 line from the back of the drivers side to the FPR and finally a -6 line back to the gas tank.
Here is a pic of the tops of the pistons.
![](http://i47.photobucket.com/albums/f165/SRT10KLLR/Camaro%20Engine/Pistons001.jpg)
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What came first, the dyno tune or the 200 miles of driving? Bob
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#19
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I was running 22psi and 20 degs on my engine, pump gas and alot of meth..
The way the piston skirts look are just the reason I dont like stroker cranks.. alot of guys have problems with shaving the skirts off with stroker cranks.
I really dont think the engine went lean as the pistons dont show any sign of hot spots on the top
The way the piston skirts look are just the reason I dont like stroker cranks.. alot of guys have problems with shaving the skirts off with stroker cranks.
I really dont think the engine went lean as the pistons dont show any sign of hot spots on the top