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Old 07-27-2008, 06:28 PM   #1
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Default Glow Plug Choice/Humidity %

I was recently told by a veteran that the higher the humidity is the hotter the plug I should use. He basically summed it up like this.

60% Humidity(or below) Cold Plug
60-80% Humidity Medium Plug
80% and above Hot Plug

For the last two months my brother and I have had no heat problems. He runs a medium standard plug in his Losi 427 and I run a hot Novarossi C5 Turbo Plug in my Nova Plus 21-7. We live in Mississippi so humidity is usually very high. Last night humidity was very high due to rain early in the day with high temps in the evening. It wasn't extremely hot outside but very muggy. Both of us fought high temps from our engines all night.
My brother went off of what we were told about plugs and tried a hotter plug and saw no difference. I read in the GRP manual that the hotter it is outside the colder the plug you need, just like in a 4 cycle. Generally in Mississippi the hotter it is outside, the higher the humidity but other places like Cal. or the Midwest that isn't always true right? Dry heat?
So, please someone explain to the general rule of thumb with outside temp.and humidity in relation to plug choice.
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Old 07-28-2008, 06:47 AM   #2
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Come on guys I know dozens of you can explain this.. why the blackballin?
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Old 07-28-2008, 06:58 AM   #3
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Originally Posted by NEMESIS44 View Post
Come on guys I know dozens of you can explain this.. why the blackballin?
I run the P3 all year round. Works great and purrs like a kitten at idle speed.
http://www.osengines.com/accys/glowplugs.html

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Old 07-28-2008, 07:03 AM   #4
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Thanks but that doesn't answer my question.
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Old 07-28-2008, 07:06 AM   #5
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Thanks but that doesn't answer my question.
That's the best I can do. Maybe one of the gurus will chime in? On there site it explains it pretty well.
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Old 07-28-2008, 07:48 AM   #6
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Originally Posted by NEMESIS44 View Post
Thanks but that doesn't answer my question.
Your local VET hit the nail on the head! The denser the air, the hotter the plug..
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Old 07-28-2008, 08:56 AM   #7
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+2
I agree that your local vet gave you the correct info.
In Pa, we are having some warm and humid days. Fattening up that bottom needle and running a warmer plug seems to work.
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Old 07-28-2008, 09:38 AM   #8
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We had temps around 95 the entire time, with humidity at 100% and going to the hotter plug and fattened up setting didn't help.
Why does GRP recommend to go to a colder plug in hotter weather?
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Old 07-28-2008, 09:42 AM   #9
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That's the best I can do. Maybe one of the gurus will chime in? On there site it explains it pretty well.
I would take you up on running a P3 but I have a Nova 21-7T and Ninja B01 with all new GRP MRTuned interals.
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Old 07-28-2008, 10:09 AM   #10
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The Nova plugsa also come in short and long body for humid diff...


http://www.outlawrc.com/glowplugs.htm
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Old 07-28-2008, 11:01 AM   #11
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[QUOTE=JayL;4681436]The Nova plugsa also come in short and long body for humid diff

I have been running the long body(veteran told me to). Whats the difference? Long for high humidity or long for low humidity and does outside temp. have anything to do with the length?
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Old 07-28-2008, 02:47 PM   #12
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NEMESIS44: check the link I posted, it has all the temps and humid and what plug to run.
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Old 07-28-2008, 04:21 PM   #13
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Thanks that was very helpful. Wish GRP had long and short bodied plugs.
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Old 07-28-2008, 06:09 PM   #14
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Ok I want a shot at this one. Humid days are low on air its required to lean the needle. Therefore a cold plug is recommended because it has a bigger wire in the plug. The lean mixture has a hotter fire. And the thicker wire is more dependable in an hour long main.

Cold days it recommended to run a hotter plug because there's more air and the needle mixture is richer, or more fuel running threw the plug, it needs the smaller wire to be hot enough to burn the added fuel on a cold day.
Well?????????????

I personally think we can get to technical on some of this stuff.
But I'm not real hard core either.
This is a good learning thread.
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Old 08-02-2008, 09:11 PM   #15
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It's not really a matter of getting technical, it's actually a pretty simple matter. Temps...200-fat 210-fat 220-fat 230-fat oh sh*t 300

I did fail to mention that when we are having these issues we are racing on a almost WOT dirt oval. I followed up on the link above and used Novarossi's chart and had good results tonight. Outside temp. was 95 and humidity was 50% it suggested using the short body plug in a C8(ultra cold). I had a short C7 and after I finally left the LSN alone and leaned on the top a little it ran like a champ. So, thanks again for that link.
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