I have a 06 Roush F150 w a 5.4., 60,000 miles. always been taken care of. I lost the piston in #8 , I have to replace the whole motor. seems crazy with so few miles. Is this normal for these motors??

 

Doesn't the powertrain have a 100k mile warranty?

 

Which exact Roush package, any other mods, any tunes? What have you been using for gas?

 

its the r/c 500 stage 3, only charged, no tune or any other mods , always premium

 

its an r/c 500 , charged, no tuner or other mods , always run premium

 

I've heard that some of the 5.4 engines have had problems with the #8 cylinder.

 

So it's supercharged, running a stock PCM?

 

what was the cause of no/low compression on cylinder 8?

 

'06 only had 3 year 36k.....

 

I wouldn't call it normal. Cylinder 8 runs the hottest and therefore is more likely to experince detonation eventually burning a hole in the piston. A lean mixture can create egt's hot enough to ruin the exhaust valve. Other worthy mentions that will create either of these problems is running the wrong temp range spark plug will allow heat to build in the combustion chamber, towing heavy loads (especially in od), racing, prolonged high speed, a dirty fuel filter, stuck injector, intake leak, dirty fuel, low octane and so on. In the end cylinder 8 is the hottest followed by cylinder 4 and it is the most likely to fail. Its why an egt gauge is a must and should be located less than one inch from the exhaust port on cylinder 4 or 8. Cylinder 8 runs 20F hotter than cylinder 4.

I know this isn't particularly helpful now unless it can help you figure out what went wrong. I do hope it all works out i the end with as little pain to your wallet as possible.

 

thanks, plugs were correct, fuel fliter good , good gas , never drove to hard or towed.

Guess ill just put a new crate engine in and go from there.

 

roush PCM

 

You might want to get a good tuner to look at the parameters.

 

Be it the new era of reliable engines but some do give out early. Maybe the blower helped maybe its coincidence? Iam surprised the usual spew from the usual suspects hasn't flowered yet.

Brand spanking new 3512 Cat engine in a truck at work is burning around 10 ltrs of oil per shift. It's got 500'odd hours on it. What can I say?

 

thanks, what is Douche bag parade?? and the new crate has 3yr 100k warranty