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 Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Glow plugs:
Getting the best engine performance from your engine means choosing the right glow plug, which depends on a number of different factors – the engine type, air–fuel mix, fuel nitro percentage, and even the ambient air temperature. What's more, the right glow plug will change as conditions change.
Keeping a range of glow plugs on hand will help you fine–tune glow heat and enjoy maximum performance under all conditions.Generally, hot plugs provide better idle and acceleration than cold plugs. Cold plugs will produce more power but may idle more roughly and be harder to tune. The glow plug provided with your RB7 engine is an R5.
Glow plug tips:
Use the right glow plug. Tune your engine carefully. Running too lean will make your engine ‘blow’ plugs more often, (proper tuning helps extend plug life). Never touch the filament of a glow plug, even when cold. Don’t over-tighten your plug. Tighten it until it’s just snug.
Be sure to include the glow plug seating gasket. A plug that’s too close to the piston can cause detonation, which will quickly damage a glow plug. Use only a glow starter of 1.5 volts to heat your plug, otherwise, your plug may burn out ahead of its time.
During the break-in process, it's quite common for the glow plug to die.
To check the plug, remove the plug from the engine, then lightly hold the threaded end with pliers and touch it into the end of the glow starter. If the glow plug element glows red, the plug is okay. If it does not glow, it is dead and you need to replace it.
Tomick attached the following image(s):
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 Rank: Beginner Level 2 Groups: Registered
Joined: 30/03/2013 Posts: 14 Points: 45 Location: Melton Vic Aust
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where can we get it from ?????
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 Hi fordman These sort of plugs can be obtained from local model shops that sell nitro engines/cars/ R/C aircraft they will also have stocks of the fuel needed to run the engines. Perhaps a search of local shops in your area may help regards Andy  Current builds:-C57,Zero, Lamborghini Countach, Caldercraft HMS Agamemnon,Robi,R2-D2, MFH Cobra .
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Rank: Pro Groups: Joined: 24/08/2009 Posts: 48,827 Points: -13,348
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Here is one source, for the GX21 an R4 and R5 is a good start point, (the engine comes with an R5)
http://www.modelsport.co...-categories/9930/993030
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 Rank: Vice-Master    Groups: Registered
Joined: 05/04/2013 Posts: 540 Points: 1,630 Location: England
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I always use modelsport for my general RC accessories. Its best to have a few glow plugs on stand by especially as mentioned during the break in process. You can also get a glow plug wrench which you can screw a few spares into. There is nothing worse than one going and not having a spare. ;) Finished 3D Printer, RB7, Hummer, Skyrider drone & Combat tank collection http://www.model-space.com/gb/
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