How To Read Your Plug - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-29-2004, 09:46 PM   #1
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How To Read Your Plug

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Keeping an Eye on your glowplug will help you to understand how you should adjust your carburation.

Take the glowplug out and look at the coil element:

1. if the spiral is a little bit pressed and bent it means that the engine has too much compression. If you are racing on a sea level track, with 25% or more nitro this could be the main reason. Than you need to check under-head shims and insert another shim or you can add another glowplug copper washer.

2. If the coil element has a dull, as if it were sanded, it means that the carburation is too lean (lack of fuel) and you can damage the engine. You run the risk to break the coil element and make it fall down on the top end of the piston, damaging the piston/sleeve. In this case, you should replace the old Plug with a new plug and richen the High Speed needle 1/8th.

3. If the thread has a dark colour and the plug seems wet, the carburation is too rich and the engine isn't running at optimal power. You have to lean the carburation closing the High speed needle. If the color of the threads are BROWN, your engine is running at the right Temperature, and if it is black, you are running too hot.

4. When the coil element is polished and the spiral does not present any imperfections, your engine carburation is most likely spot on.

This, along with increased experience in learning the "Sounds" of a glow engine and use of a quality temperature guage, will make you an Ace at tuning your engine... Tuning your Models engine is not "rocket science" and is fairly easy once you completely understand how the carb works and the effects it has on your engines performance and sound. With some time and experience, it will become second nature to you... just be patient and perceptive and the knowledge you gain will take the voodoo out of this great hobby!
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Old 12-06-2004, 05:30 PM   #2
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Does it matter if its a copper washer you add or a head gasket? (number 1)
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Old 12-06-2004, 10:01 PM   #3
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well,,,,,thanks for that info it just made life eazzer 4 me.
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Old 12-07-2004, 03:46 PM   #4
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If I can add my two bits......A common mistake often assumed is:
If the glow plug is 'glowing' it must be o.k. Not it is wise to learn to read your plug.
When using a glow-ignitor, you can usually get the engine to start (even if the plug is in poor condition) if however the engine stops as soon as the glo-ignitor is removed then that's a clear indicator a new plug should be tried.
To finish first....first ya gotta finish!
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