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Nitro Rc Glow Plug onborad glow plug ignition Answered

So I'm relatively new to nitro rc and i had a few questions about on board glow plug ignition system  . I know the igniter is cheep and bla bla bla easy however...

Can one be made ?
I have often thought that i might be able to use a third channel off my receiver with a wire directly to the glow plug and at the flip of a switch the glow plug would ignite but i don't know if it would work and don't wanna spend the money on a receiver  to find out.

Is there someone out there willing to give it a go and let me know? 

Really my question would be at what voltage does a glow plug ignite? would a 7.2 volt battery do the trick?
Are there any CHEEP systems out there?



6 years ago

it can be done, you would need to have a switch of some kind that would be actuated by your extra channel on your radio (assuming it's an open channel on your receiver as well), however, you'd still have to pull the start cord, unless you've got an electric start (which i'm sure you don't since those kits usually come with an integraded glow plug warmer).

that said, you would probably be better off wiring your glowplug up to an onboard battery with a momentary switch that way you push the switch in and then pull the cord and away you go. you would just need to solder the positive and negative connections from the battery (and switch) to your glowplug in the same places that your current ignitor contacts the plug (one goes to the tip of the plug and one goes to the body of the plug where you wrench it in)


Reply 5 years ago

I realize that this is an old post, but couldn't you use a bulb to limit the current?


6 years ago

Oh I forgot....How did I get the 8 watts? E x I = W


6 years ago

Glow plugs for R/C glow at 1.5 ~ 2.0vdc. If you connect the 7.2vdc you'll be making a trip to the store to get a new plug.

To use your current 7.2vdc battery, we'll need to do some math...

We need yet another number, either the current supplied by the battery or the resistance of the plug. With either of those we can calculate the unknown.

So I grabbed a glow plug and measured the resistance which is....

.5 Ohm That's HALF an Ohm...We have our other value

So we divide 2 by .5 and get 4

"What does it mean?" you ask. It means the at 2 volts the glow plug is drawing a whopping 4 amps!! No wonder it glows so bright ! I wonder if Rudolph's nose draws that much...

Were gonna need a BIG resistor... Not big in resistance but physically big...

8 watts big.... Starting to seem a bit impractical since most electronic supply houses won't carry that size wattage wise....Hey I'm a poet

So it has to be 8 watts, what resistance? I'll leave that to you, see the formulas at the end. You might want to take say two "D" cells and parallel them ( + to + and - to - ) and then + to the tip of the plug and - to the cylinder head. I think that will get the plug to glow few times.

Here are the formulas for calculating

E - Voltage
I - Current
R - Resistance:

E = I x R
I = E / R
R = E / I