Glow Plug Choice/Humidity %
07-27-2008, 06:28 PM
#1
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.
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.
07-28-2008, 06:58 AM
#3
http://www.osengines.com/accys/glowplugs.html
07-28-2008, 07:48 AM
#6
07-28-2008, 08:56 AM
#7
+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.
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.
07-28-2008, 10:09 AM
#10
The Nova plugsa also come in short and long body for humid diff...
http://www.outlawrc.com/glowplugs.htm
http://www.outlawrc.com/glowplugs.htm
07-28-2008, 11:01 AM
#11
[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?
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?
07-28-2008, 02:47 PM
#12
NEMESIS44: check the link I posted, it has all the temps and humid and what plug to run.
07-28-2008, 06:09 PM
#14
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.
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.
08-02-2008, 09:11 PM
#15
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.
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.
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
