Originally Posted by Dredd
Getting back into R/C and a few friends as well. The thing that blows my mind is how to decide what glow plugs to use. For example...I run a Novarossi C6G based on suggestions from some people. I understand this is a medium plug. When do you use a cold plug or a hot plug? Does it depend on nitro %, engine size, weather, a combination?
Thanks for schooling an idiot
Turbo Glow Plugs where designed to give more performance to an engine, for the following reasons:
1.- It forms an uninterrupted combustion chamber.
2.- The advantage of better heat transfer or heat dissipation, and a leak proof seal, generated by the conical seat of the plug.
3.- Greater choice of thermal ranges, that allow for a more precise tuning according to variations in weather conditions (temperature, humidity, altitude, barometric pressure, etc.).
The numbers and characters on the plugs, are the product number, wire thickness, and thermal range of the plug’s body. Example: The Novarossi C6TG (F) or (C)
Product: C (Conical)
Wire Thickness: 7
Plug Type: T (Turbo)
Plated: G (Gold)
Thermal Range: F (Fredda = Cold) C (Calda = Hot)
The plugs with cold thermal range F (Fredda), have a body with thinner walls and shorter body, so they dissipate heat better and faster to the engine head. The plugs with hot thermal range C (Calda), have a body with thicker walls and longer body, so they retain heat and dissipate heat slower to the engine head. The number of threads is the same on both types of plugs.
How to select the proper plug:
1.-When the ambient temperature is high, we have to use a plug with thicker wire.
2.-With higher compression, we have to use a plug with thicker wire.
3.-Humidity determines if we use a Cold (F) thermal range, or Hot (C) thermal range.
4.-With high humidity percentage we should use a Hot (C) thermal range plug.
5.-If we have high temperature and high humidity, we should use a plug with thick wire and a Hot(C) thermal range.
The best instrument to determine which Turbo Plug to use, is those table digital weather stations, that have Temperature, Humidity, and some also Barometric Pressure on them. That is the key to success or failure tuning engines with Turbo Glow Plugs, because they are so sensitive to weather variations that it is unbelievable.
Following is a selection chart for Novarossi Turbo Glow Plugs
Type Therm Range Nitro% Air C° Air Fº Humidity%
C5TGC Hot/hot 10-20 0-10 32-50 70-100
C6TGC Hot/medium 10-20 10-16 50-61 70-100
C7TGC Hot/cold 20-30 16-25 61-77 70-100
C8TGC Hot/ultra cold 30-up 25-up 77-up 70-100
C5TGF Cold/hot 10-20 0-10 32-50 40-70
C6TGF Cold/medium 10-20 10-15 50-61 40-70
C7TGF Cold/cold 20-30 16-25 61-77 40-70
C8TGF Cold/ultra cold 30-up 25-up 77-up 40-70