21. O . S . also makes required accessories for their engines including glow plugs , exhausts / mufflers and air filters. 22. Cold engine start is achieved via multi-hole piezo injectors with 3 programmable injection patterns, and adoption of ceramic glow plugs . 23. There are some year models of Jeep that require a module output for the 4-volt glow plugs installed on those models. 24. Nova Rossi produce 60, 000 engines a year, and 300, 000 glow plugs a year . showing a very high global interest. 25. The greater the nitromethane content in the fuel, the hotter the fuel will burn; high " nitro " fuels require cooler glow plugs . 26. Glow plug engines can be designed for two-cycle operation ( ignition every rotation ) or four-cycle operation ( ignition every two rotations ).27. The 2008 Mercedes E320 Bluetec has the NGK CZ 302 glow plug ( replaced by NGK CZ 303 ) that require 7 volts. 28. In model engines, the glow plug is an integral part of the ignition system because of the catalytic effect of the platinum wire. 29. Although there is a common misconception that model glow plug engines are a variation of the hot bulb engine, this is not the case. 30. The fuel injector spray pattern then impinges directly upon the hot tip of the glow plug during the injection of fuel at top dead center.
