Glow Plugs

Old 08-23-2009, 07:50 PM
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Default Glow Plugs

I did a search to try and answer my question but couldnt find what I was looking for.

I purcahsed some spare glow plugs for my 1:8 nitro buggy on weekend, got OS medium hot ones.

I dont understand the difference between the heat differences eg medium vs. medium hot.

Can someone explain to me the difference when when I should use which one?
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Old 08-23-2009, 08:08 PM
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I've been trying to find the same info and can't find anything. I don't know what plugs to use in my buggy.
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Old 08-23-2009, 08:53 PM
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Pages 1 and 2 help a bit...
http://findarticles.com/p/articles/m...g=content;col1

This one is very in depth but the last half is the best
http://www.iroquois.free-online.co.uk/gloplug.htm
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Old 08-23-2009, 08:55 PM
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Glow plugs are essensially the timing adjustment in an engine. A hotter plug causes the ignition charge to happen slightly earlier, a colder one causes it to happen slightly later. Medium and hotter plugs usually make for a better idle and a wider tuning window, colder plugs usually make for a crisper response and cleaner top end while more difficult to achieve a good idle. If you go too hot on the plug and too lean on the needle, you could have detonation.
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Old 08-23-2009, 11:25 PM
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Thanks for the info. Ill be keeping a closer eye on the element in my glow plug from now on.
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Old 08-24-2009, 05:29 AM
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Hot days 90's and high humidity = COLD plugs. Normal days below 90 with moderate humidity = med - hot plugs. It is important to change plug type with changing weather. Hot plug on hot days equal flame outs and vice versa Cold plugs on cool days equal flame outs.
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Old 08-24-2009, 04:48 PM
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Originally Posted by vladconnery View Post
Hot days 90's and high humidity = COLD plugs. Normal days below 90 with moderate humidity = med - hot plugs. It is important to change plug type with changing weather. Hot plug on hot days equal flame outs and vice versa Cold plugs on cool days equal flame outs.
It's 100+ here daily and I don't flameout with medium plugs. Head temp is around 220.
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Old 08-24-2009, 04:51 PM
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Originally Posted by Davidka View Post
Glow plugs are essensially the timing adjustment in an engine. A hotter plug causes the ignition charge to happen slightly earlier, a colder one causes it to happen slightly later. Medium and hotter plugs usually make for a better idle and a wider tuning window, colder plugs usually make for a crisper response and cleaner top end while more difficult to achieve a good idle. If you go too hot on the plug and too lean on the needle, you could have detonation.
best.answer.ever.

Glad to read that one.
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Old 08-24-2009, 05:32 PM
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that gives me something to work on, thanks for the info guys. got a couple of months before it starts to get hot here in Melbourne so ill stick with the medium hot for now, max temp its been here in last 3 months is 68f but in middle summer it hovers around 95f.

thanks again
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Old 08-24-2009, 05:51 PM
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Originally Posted by pickle311 View Post
It's 100+ here daily and I don't flameout with medium plugs. Head temp is around 220.
Where is here? Also keep in mind every engine is a different as a finger print. If that's working for you then stick with it. Hot plugs for cool days and Cold plugs for hot days is a general rule not the law. Also keep in mind there is not a standard manufacturers rule for cold to hot plugs. One company's med plug is another company's cold plug.
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Old 08-24-2009, 11:58 PM
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Thanks again people, Ive got what I think I need to work with now and has me headed in the right direction.
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Old 08-25-2009, 01:53 AM
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hey sperera

i live in canberra and race all ova the east coast and i have only eva used #6 and#5 glow plugs all year round. but i supose its all up to tuning skill and personal prefrence.
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Old 08-25-2009, 07:10 PM
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Originally Posted by rcmad2700 View Post
hey sperera

i live in canberra and race all ova the east coast and i have only eva used #6 and#5 glow plugs all year round. but i supose its all up to tuning skill and personal prefrence.
rcmad2700 thanks for the info, are those medium plugs? Sorry im new, I think my medium hot ones are #7 or 8, cant remember.

Would the plugs have anything to do with the running temp or more the idle and response?
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