As an ex LAME of the era at Qantas of 'wet' JT9D engines, I must concur with "justavagander" entirely. The engine ground runs were just as spectacular as those described. Added to that was the exorbitant cost of the demineralised water supplied by fuel agents. Water Injection was a great idea but in practice, the bad far outweighed the good. However, I was able to pay off my house mortgage quickly on the overtime earned thru all those engine changes due to overtemps from malfunctioning water injection systems!!!!!!