text: heavy detonation or preignition is common to 
  the high airflow at maximum power, the most 
  likely chance of detonation or preignition is at 
  takeoff. 
  In order to suppress detonation or 
  allow greater power for takeoff, water injec- 
  tion is often used in the reciprocating engine. 
  the injection of the 
  At high power’settings, 
  water-alcohol mixture can replace the excess 
  fuel required to suppress detonation, and de- 
  richment provisions can reduce the fuel-air 
  ratio toward the value for maximum heat re- 
  lease. Thus, an increase in power will be ob- 
  tained by the better fuel-air ratio. 
  In some 
  instances, a higher manifold pressure can be 1 
  utilized to produce additional power. The in- 
  jection fluid will require proportions of alcohol 
  and water quite different from the injection 
  jet engine thrust augmentation. 
  fluid 
  Since derichment of the fuel-air ratio 
  is de- 
  sired, the anti-detonant injection (AOZ) will 
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  fluid from fouling the plumbing. 