A number of people have upgraded their 1.9 engines for 2.1 and have then had
bottom end failures. It is necessary to maintain the 2.1 liter engines oil
cooler when doing this. The 2.1's longer stroke seems to cause the oil to
operate at much higher temps than the 1.9. Even with the oil cooler working,
260'F and up is normal at 4,000rpm. Most bearing or rod failures are not
caused by normal wear. Something failed or wear was really excessive which
would have provided much warning before parts started flying. Excessive oil
temps will thin the oil out enough that oil can actually stop pumping at
all.

Hope this helps someone,
Dennis