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Old 10-04-2007, 03:17 PM   #1
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Default Trivial Question on glow plugs

Can someone give me the low down on Glow plugs. What are the differences, cold, hot, medium, long, short, blah, blah. I have a general idea, but I want the facts!!! I have an old .21 RB C4 that still kicks ass and a .28 Picco P3. Racing offroad in temps between 58 to 75 degrees F. Which glow plug do i need for my two engines?

Thanks!!!
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Old 10-04-2007, 04:22 PM   #2
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http://www.outlawrc.com/glowplugs.htm
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Old 10-05-2007, 08:54 AM   #3
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That's a good link but I do have one issue with some of the info they have posted.

A glow plugs "heat" range has nothing to do with temperate. For example they list the MC-59, 8, and 9 all for 20-40% nitro and just varying outside temperatures. That is basically false.

The heat range of a plug is used to alter the engines timing. A hot plug advances, a cold plug retards. High compression and high nitro will both advance timing, that is why a cold plug is generally used in this condition.
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Old 10-05-2007, 09:26 AM   #4
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good call
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Old 10-05-2007, 11:19 AM   #5
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Quote:
Originally Posted by gubbs3 View Post
That's a good link but I do have one issue with some of the info they have posted.

A glow plugs "heat" range has nothing to do with temperate. For example they list the MC-59, 8, and 9 all for 20-40% nitro and just varying outside temperatures. That is basically false.

The heat range of a plug is used to alter the engines timing. A hot plug advances, a cold plug retards. High compression and high nitro will both advance timing, that is why a cold plug is generally used in this condition.
so im running the losi 427 in my buggy and am useing tq 30% and mccoy 59 and my car is running fine should i change are keep it
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Old 10-05-2007, 11:42 AM   #6
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Old 10-05-2007, 05:31 PM   #7
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If it runs fine for you then stick with it. Usually with hotter fuel you would not need such a hot plug but large displacement motors need a clean burn on a lot of mixture. You will be fine.
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