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How a Glow Plug Works
How to Choos the Right Glow Plug
How a Glow Plug Works <br> How to Choos the Right Glow Plug
CHOOSE THE Correct Glow Plug !!!!:
How a Glow Plug Works
Spark plugs in gasoline engines cause ignition with a spark. In nitro engines, glow plugs cause ignition with heat. Heat is created initially by connecting a glow starter or 1.5V battery to the plug. Once the plug comes up to heat, the battery is disconnected and the heat retained by the combustion chamber will keep the engine running.
Engine timing is automatic and controlled by engine rpm.
Running at higher rpm makes the plug hotter and "fire" the fuel-air mix sooner.
At lower rpm, the filament cools and the plug fires less frequently.

How to Choos the Right Glow Plug
The "right" glow plug for your engine is the one that gives you the best performance.
And you can choose the right plug for any situation, just by following the guidelines below.

1. Engine Type
Guideline 1: Know what type of engine you have. Is it a standard - or a turbo?

Standard engines (engines with a 1-piece head) are most common.
Standard plugs are easily available, inexpensive and fit almost all standard engines.
Standard plugs are installed with a washer, which creates a compression seal with the head.
Many new O.S. engines are turbo engines, which feature a special 2-piece turbo head.
The biggest benefit of turbo plugs is superior performance.

Unlike standard plugs, turbo plugs (identified by a "P" in the description) feature a tapered "seat" that matches perfectly with the head.
That creates a superior compression seal and with it, maximum efficiency and power.
Turbo plugs are the choice for racers who want - and need - top performance. A word of caution: you should never install a turbo plug in a standard engine or vice versa.
Doing so risks doing serious (and expensive!) damage.

2. Displacement
Size matters to glow plugs. What size is your engine? 2. Displacement
A .12? .15? .21? 2. Displacement
Big engines have more mass and retain heat better.
Smaller, lighter engines dont, and need the help a hotter plug can offer.

Guideline 2: The smaller the engine, the hotter the plug.

3. Fuel Nitromethane Content
Whats the nitro percentage in your fuel? High-nitro fuels produce more power than low-nitro fuels, but also produce more heat.

Guideline 3: The higher the nitro content, the colder the plug.

4. Temperature
Smart modelers tend to keep a variety of glow plugs on hand.
The reason? Because the "right" plug for your engine can change with the temperature.
To achieve top performance, your choice of plug needs to change, too.

Guideline 4: The hotter the day, the colder the plug.

5, 6 & 7. Other Considerations

Here are a few other things you should know.
Hot plugs promote better idling and acceleration.
If your engine runs rough or accelerates sluggishly, a hotter plug will help.
Cold plugs produce more power and may improve performance if your engine runs hot.
The downside is rougher idling and more difficulty in tuning.
Where you run also plays a part.
If the track/course has a lot of twists and turns, a hot plug is fine.
If the track/course has long straights where you will reach maximum rpm, a colder plug is best.

Fuel-air mix not only affects how your engine performs:it can also have an impact on how long your plug lasts.
If you run rich, it means that you are using more fuel than necessary for top performance.
Modelers are often advised to run rich during engine break-in, because it helps cool the engine.
However, running too rich can also cause an engine to "bog down" or quit entirely.
In addition, it also means that the glow element is being exposed to more contaminants than necessary, which shortens plug life.

Running lean means that you are using less fuel. "Leaning down" an engine has a positive effect on performance.
However, care is needed here, because over-leaning an engine can harm it, by raising operating temperatures, "burn up" a plug before its time.

Final Thoughts
Choosing the right glow plug not only improves performance, but can also extend the life of your engine and the glow plug itself.
With the guidelines above and the tips below, you are well on your way to achieving both.
1.Buy quality plugs. You are protecting your investment.
2.Store plugs where it is dry. Moisture can ruin them.
3.Use the right glow plug. Follow the guidelines above.
4.Follow proper break-in procedures.
5.Tune your engine carefully.
Running too lean will make your engine "blow" plugs more often.
Proper tuning helps extend plug life.
6.Never touch the filament of a glow plug. Doing so can break the filament and ruin a plug.
7.Do not over-tighten your plug. Tighten it until it is just snug.
8.Be sure to shim your engine correctly.
A plug that is too close to the piston can cause detonation, which will quickly damage a glow plug.
9.Use only a glow starter or 1.5V battery to heat your plug.
Otherwise, your plug may burn out ahead of its time.
10.Do not be afraid to ask for help.
Experienced modelers have already "been there, done that."
Their experience can save you time and money - and most are glad to help.
(Extracted from O.S. Max Engines website)(www.osengines.com/

#6 Hot OSMG2690 A long-lasting plug for most .10-.60 2-strokes
P3 Ultra Hot OSMG2699 For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines
P4 Super Hot OSMG2697 For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines
P5 Very Hot OSMG2711 For 21VZ-B V-Spec and most .18-.28 off-road racing Turbo head engines,
especially when the temperature is high or for leaner needle settings and high-nitro/high-rpm running
LC3 Hot OSMG2700 Long reach, for 1/10 scale off-road engines such as O.S. 21TMs and Traxxas® peak needle
settings and punchy throttle response
#7 Medium Hot OSMG2713 For 2-stroke airplane, helicopter and car (except Turbo head) engines.
Offers stable idling, broad peak needle settings and punchy throttle response
RP6 Medium OSMG2703 For most .12-.21 on-road racing Turbo head engines
LC4 Medium OSMG2708 Long reach, for 1/10 scale off-road engines such as O.S. 21TMs and the Traxxas
TRX2.5 & 3.3™ engines
#8 Medium OSMG2691 A favorite for most 2-stroke engines
RP7 Cold OSMG2704 For most .12-.21 on-road racing Turbo head engines
RP8 Cold OSMG2715 Outlast the hottest heats with Turbo head engines
#10 Cold OSMG2693 Ideal for aircraft engines .60-size and up
R5 Cold OSMG2694 For leaner needle settings and high-nitro/high-rpm scale racing
F 4-Stroke OSMG2692 Long reach and long life for 4-stroke engines
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