Trouble with Spark Plugs

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Old 07-05-2018, 02:23 AM
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Default Trouble with Spark Plugs

Hi everyone so here is my issue.
I have an Orion CFR Nitro Engine.
The engine is pretty new, i think i did less than 5 gallons with it, but i already had to change 3 spark plugs.
Im keeping the engine temp around 100C, it's not lean at all, so i don't get why it's killing the SP.
On a side note, if that can be any relevant, it always happened when i runned out of fuel, and i was using byron 25% nitro and 11% oil (the tank was open since 4 months i reckon).

So, can it be due to bad fuel or the oil %?
Thank you.
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Old 07-05-2018, 02:56 AM
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Running out of fuel will always give the chance of blowing the plug so do not do that.

5 galons is pretty used, did you ever check or renew the bearings and conrod?
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Old 07-09-2018, 03:09 AM
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Originally Posted by Roelof View Post
Running out of fuel will always give the chance of blowing the plug so do not do that.

5 galons is pretty used, did you ever check or renew the bearings and conrod?
Sorry, i meant to say less than 5 liters, that is 1 galon and a half i think.
Could it be the 11% oil Byron fuel, because it just always happened when i used that, not with the 9% nor with another brand 9% fuel.
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Old 07-13-2018, 05:12 AM
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It's not the fuel killing glow plugs. If it's constantly killing them and you are sure you're not too lean (ignore temp, it means almost nothing. Judge tunes on sound and performance) then the usual culprits are bearing failure or a stretched connecting rod as stated before.
Richen it, change fuel if you must, and rule that out.
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Old 07-13-2018, 11:51 AM
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Originally Posted by Guyon View Post
Hi everyone so here is my issue.
I have an Orion CFR Nitro Engine.
The engine is pretty new, i think i did less than 5 gallons with it, but i already had to change 3 spark plugs.
Im keeping the engine temp around 100C, it's not lean at all, so i don't get why it's killing the SP.
On a side note, if that can be any relevant, it always happened when i runned out of fuel, and i was using byron 25% nitro and 11% oil (the tank was open since 4 months i reckon).

So, can it be due to bad fuel or the oil %?
Thank you.
3 plugs in 5 gallons? you like to take chances i take it? lol

a gallon on a plug is more than it should be ran imo
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Old 07-13-2018, 12:35 PM
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He clarified on post #3. 5 liters.
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Old 07-13-2018, 01:13 PM
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Originally Posted by houston View Post
3 plugs in 5 gallons? you like to take chances i take it? lol

a gallon on a plug is more than it should be ran imo
So youre saying one should only put a gallon on a plug and then change it?
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Old 07-13-2018, 05:27 PM
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It can be a pretty big difference how long they last depending on what brand they are.
But as Roelof said, running out of fuel can blow a plug, especially if running it hard while it runs out of fuel.
Break-in will also consume one glow plug, but 3 during 5 liters is pretty bad!
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Old 07-13-2018, 06:19 PM
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I don’t know man. I got 2 gallons from a Nova C6TGC in my Legend 28-8RT and over 1.5 gallons from a Picco P6S in my Picco .28. The Nova plug was the factory issued plug that came in the engine. I still haven’t changed it!

Granted these are basher rigs and not racing, but still. If it ain’t broke, don’t fix it is my motto.

I’m sure the racing environment is more demanding, so perhaps new plugs are required more often... but if the engine runs fine and takes a needle setting without much fuss, why change it? Conversely, if your engine is consuming plugs much more often, determining the cause is in order. Reading the glow plug is the first step. This should tell you what you need to know to figure out the problem. If not, some more troubleshooting is in order; there’s only a few things that will cause plugs to pop prematurely.
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Old 07-14-2018, 03:54 AM
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Well, if you drop a coil the fun is usually over, so it's pretty cheap insurance to change them.
When I have used Novarossi plugs they gave up around where Houston said, so I changed them around 1 gallon, and I see no problem at all in that.
Picco plugs I usually run about 2-3 gallons on, but they usually last a lot longer then that though they get a little more difficult to tune when they get older.
I have used other brands as well for testing purposes, and have thought about testing some brands as well to see how they work but not got around to it.
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Old 07-14-2018, 05:59 AM
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Huh.. My experience is much better than that so far. Maybe I’m just lucky.

Ive only ever lost the whole element from one single plug, but that was in an airplane engine. It didn’t damage the engine at all thankfully. Car engines I’ve gotten a bit lean and deformed elements and such, but never dropped an element. Again - maybe I’m lucky. I guess being strictly a basher has advantages. Glow plugs last a long ass time - and on homebrewed fuel... who knew?

Truly YMMV.

Last edited by RCTecher12; 07-14-2018 at 06:24 AM.
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