Nitro Glow Plug selection Guide

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Here is a guide that is helpful when selecting what glow plug to suit what engine / conditions / fuel.

Glowplugs, in general:
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- Higher ambient temperature = colder plug
- Higher nitro content = colder plug
- Longer tracks = colder plug
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For each of these rules, the opposite is also true, i.e. low ambient
temperature means a hotter plug is required.

So for a track with lots of straights, in 30+ degrees, with 25%
nitro, you want the coldest plug you can get.

MC-9, OS A5, Rossi R5, RB 8, etc.

In the same conditions but on a tighter track, cold or medium cold.

MC-8, OS A3, Rossi R3, RB 7, etc

On colder days, use a slightly warmer plug.

Below is a list of popular plugs and their temperatures. Note that
each manufacturer has their own definition of what 'hot' or 'cold'
actually means, so a hot RB plug is not identical to a hot McCoy
plug. However they will be in the same ballpark.

The easiest way to deal with this is to pick one brand that is
easy to get, or you know is reliable, and then just use whichever
of their plugs is appropriate for the conditions and your engine
and fuel. Don't go trying hundred of different plugs as it will
just be too confusing.

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McCoy Plugs:
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MC-55: Hot, 0% - 16%
MC-59: Medium-Hot, 16% - 20%
MC-8: Medium-Cold, 20% - 25%
MC-9: Cold, 25% - 30%

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OS PLUGS
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OSMG2690- #A3 Hot plug for low nitro (0-5%).
OSMG2691- #8 Medium plug for (5%-20%)
OSMG2693- #A5 Cold plug for high nitro (20%+).



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Novarossi Plugs:
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C1 Very Hot
C2 Extra Hot
C3 Hot
C4S Hot ("Special")
C5R/C Hot (with protection band)
C4 Medium
C5S Medium ("Special")
C5 Cold
C7R/C Cold (with protection band)
C6S Cold ("Special")
C6G Cold ("Special Ultra")
C7G Cold ("Special Ultra")
C6 Extra Cold
C8S Extra Cold ("Special")
C7 Very Cold
C8 Very Cold


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RB Plugs:
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1055-4 RB No. 4 Hot
1055-6 RB No. 6 Medium
1055-8 RB No. 8 Cold

1056-5 RB CP-02 No. 5 Hot
1056-6 RB CP-02 No. 6 Medium
1056-7 RB CP-02 No. 7 Cold

CP Plugs are for competition (better resistance? whatever that means.)

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O'Donnell Plugs:
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#77 Hot
#99 Cold

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Enya Plugs:
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#3 Hot
#4 Medium Hot
#5 Medium
#6 Cold

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Model Technics:
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MaxFlash M3 Cold
MaxFlash M4 Cool
MaxFlash M5 Medium
MaxFlash M6 Warm
MaxFlash M7 Hot
MaxFlash M8 Extra Hot

FirePower F2 Extra Cold
FirePower F3 Cold
FirePower F4 Cool
FirePower F5 Medium
FirePower F6 Warm
FirePower F7 Hot

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