This image was found over Reddit Subforum "Mustang" where someone found this 2015 4-cylinder engine with a nice hole in the bottom. According to the picture's poster, their brother, who works as a tech at the dealer, said that the person tried downshifting from 2100 RPM in 6th to 2nd gear. Yeah...that would cause it.


Now, that's not to say these blocks aren't strong. With new turbos and a couple of other bolt-ons, people have been getting upwards of 400 HP. While we cannot yet confirm the exact details, it does seem to be driver error and not the result of an engineering error.

EDIT: Some people on Reddit were discussing whether or not the driver was in fact to blame for this. One user, /u/OffensiveTroll, stated that: "Sixth gear ratio is 0.704, diff ratio is 3.31:1. Rolling tire diameter ~28.5". Assuming he was at 2100RPM in 6th gear, he would be going approximately 76mph.


The Ecoboost engine has a rev limit set at 7,000rpm. Plugging the 2nd gear ratio of 2.538 into the equation at 7,000rpm tells us that the car will be in redline at 2nd gear at ~68mph.

My conclusion is that he didn't overspin the engine much when shifting into 2nd gear, maybe a few hundred rpm over redline."


So anyone care to argue that?