Last Updated：2025/11/22
(automotive, aviation) The process of squirting a small amount of water, in the form of a fine spray, into the air/fuel mixture going into a gasoline piston engine, in order to cool the engine cylinders, and, thereby, reduce detonation or knocking in high performance engines, especially when using a high compression ratio.
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water injection
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Source Word
water injection
Noun
uncountable
(automotive,
aviation)
The
process
of
squirting
a
small
amount
of
water,
in
the
form
of
a
fine
spray,
into
the
air/fuel
mixture
going
into
a
gasoline
piston
engine,
in
order
to
cool
the
engine
cylinders,
and,
thereby,
reduce
detonation
or
knocking
in
high
performance
engines,
especially
when
using
a
high
compression
ratio.
Japanese Meaning
自動車や航空機のエンジンにおいて、気缶内の空気・燃料混合気に極細の水の霧を噴射し、エンジンシリンダーを冷却することで高圧縮比エンジンにおける敲火（ノッキング）を抑制するプロセス
Sense（1）
(automotive,
aviation)
The
process
of
squirting
a
small
amount
of
water,
in
the
form
of
a
fine
spray,
into
the
air/fuel
mixture
going
into
a
gasoline
piston
engine,
in
order
to
cool
the
engine
cylinders,
and,
thereby,
reduce
detonation
or
knocking
in
high
performance
engines,
especially
when
using
a
high
compression
ratio.
Sense（2）
