Page 21 - Catalog spare parts NGK for cars

Auto Parts / Ceramic glow plugs

As opposed to a metal rod glow The NHTC ceramic glow plug was The answer: many things “can” be
plug, the heating coil of a ceramic specially developed by NGK to done, of course. The question is,
glow plug has an especially high enable automobile manufacturers what risk is involved. In cars that
melting point. It is also sheathed to comply with the Euro 4 and have NGK ceramic glow plugs
in silicon nitrite, an extremely Euro 5 emissions standards. One installed at the factory, only NGK
rugged ceramic material. The of the goals of these standards is ceramic glow plugs should be
combination of the heating coil to reduce the compression ratio in used when it comes time to
and ceramic sheath enable higher diesel engines. NHTC glow plugs replace the glow plugs.
temperatures and extremely reach a temperature of 1,000 °C The reason: These glow plugs
short preheating times due to in less than two seconds and were developed in-house for the
excellent thermal conductivity. can after-glow for more than respective engines. Ceramic glow
Also, ceramic glow plugs have ten minutes at temperatures plugs from NGK guarantee a long
a more compact design. This of up to 1,350 °C. Optimal service life and ensure a reliable
is important, because there combustion is assured even and fast ignition, even at the
is very little free space in with low compression ratios. In lowest outside temperatures.
today’s engines. In an SRC addition, the NHTC glow plug At the same time, they reduce
(Self Regulating Ceramic) glow can glow intermediately to harmful emissions. Although they
plug the heating element is prevent cooling of the particle at first appear to be somewhat
made of ceramic with a sintered filter in deceleration phases. more expensive than metal glow
metal heating coil. An HTC plugs, one should consider the
(High Temperature Ceramic) or Ceramic glow plugs: following: Metal glow plugs can
NHTC (New High Temperature the technical optimum make it difficult to start a car at
Ceramic) glow plug has a heating For more than 20 years extremely cold sub-zero
element and a heater made automobile manufacturers have temperatures.
of ceramic. been using NGK glow plugs as
standard equipment. But can Tip!
these glow plugs be replaced with When changing to metal glow
comparatively less expensive plugs, all of the glow plugs have
metal glow plugs? to be replaced, including those
that are intact.

GB 19

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