I don't know but it seems (IIRC #4 cylinder) likes to go away modded or not. Mostly ringland failures...Oh no, thats not what I wanted to hear but needed to. I've seen a few pix of the pistons, wow. Why does the Fist ones look so much better?
This is one thread of the many (modded or not)What's the St engine issue? Have 56,000 miles on mine. No issues at all.
Let's see put a tune on it modify it beat the crap outta it. Then cry about it breaking.
Whatched a fella buy an RS with zero miles pulled out of the dealership and had the pedal to the floor. Held it there until he disappeared. How long do you think that car is going to be around?
I was very deep into the blown motor thread. The causes seem to be pistons melting/ringlands. As far as I know, even ford doesnt know why it happens, according so some techs, they told me that theirs calcium build up and flakes off in the cylinder. Also the one guy had cylinder 3 die and when they pulled it apart the carbon build up was so bad it make the valves stick. When talking to ford, I asked how to prevent this, they told me theirs not really a way to stop it. From owners, a catch can would help a lot and to check the intake during oil changes just to make sure the build up isn't bad. I was told also that 5th at 3k rpms is fine as long as you ease into the throttle and some pulls on the highway would help burn off some build up.
This thread is only a fraction of owners, plenty of them are very happy while others blow up. I know 3 guys, they have a 15', 13' and 14'. Their on motor number 2.
They had the same problem just in different cylinders. And 2 were tuned. A catch can helps but their is always a chance of detonation. I have a 16 and so far 16's blowing up inst as common but i still would like to avoid it. The solutions to keeping it healthy from what i gathered up is, treat it like a 5 speed. 5th gear at 3k rpm is fine as long as you ease on it. 4th or 3rd to over take and 5th and 6th for the mpg life depending on how fast your going and so on. Also a catch can and just check the intake and plugs during oil changes.
Tuning is different from factory... ecoboost escape are more for hauling than doing quarter-mile runs.Why the focus st? the escape has much the same motor. I've seen hundreds of escapes no piston issues.
The DI motors do have carbon build up,more so than non DI motors.
they are doing that swap on the 2.3L mustang. the ports for the NA 2.0L is better flowing then the ports on the 2.3L mustang. pretty sure i read that it was an upgrade for the ST as well. so you would have to either make your own exhaust mani.And if thats the case, Who has a header/manifold for the turbo?