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glowplugs

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abovelegit

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  1. Bashing
So my glowplug on my lrp finally gave away, I ordered a similar glowplug to replace it; but in the mean time I put an OS plug in it. I noticed I had to retune also, kind've a given. But it sounds a little different too. I was just wonderin what kinds of glow plugs are out there and why it may be sounding different.

Thanks!
 
If the OS plug is a little longer or shorter than the stock plug it will change the compression slightly. It may also be a hotter or colder plug.
 
whats a colder/warmer plug mean? and yup, it was way shorter.
 
Me personally I like the OS R5 plug I run them in all my .21 and larger engines. I race more then I bash thou.
I also use the OS#8 as well as O'Donnell plugs generally the med to cold plugs.

I run 30% in all my engines

Tower hobbies carries the OS R5 plugs
 
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my dad and i raced hemis and 440s a LONG time ago. he allways said " its cheeper to foul a plug, cause its cold, than burn a hole in a piston, cause its to hot ". i do know that spark plugs are different than glow plugs. but they do act a little alike.
 
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unknown123 said:
my hobby dealer said that OS 8 glow plugs last much longer
Click to expand...
He's lieing. ;)

I run McCoy MC8's in my LRP28's with 25% nitro and they run really good. I used to run OS#8's, but gave these a try. They are a bit cooler than OS's and my engines run better. Gave me better power throughout the RPM range. No noticeable difference in glowplug life between the two.

moe7404 said:
my dad and i raced hemis and 440s a LONG time ago. he allways said " its cheeper to foul a plug, cause its cold, than burn a hole in a piston, cause its to hot ". i do know that spark plugs are different than glow plugs. but they do act a little alike.
Click to expand...

A glow plug that is too hot for your fuel/compression will cause the fuel to detonate and it will pit the snot out of your piston. Causes poor performance and after enough time I'm sure damages the con-rod and definitely the piston face. Running too cool of a plug may cause the fuel to ignite when the engine is already on it's way down, which looses power and causes excess fuel build up in the pipe. This may cause you to run too lean to get decent power out of it, which of course isn't good on the engine.

Higher nitro = cooler plug
Lower nitro = hotter plug

Higher than 25% nitro usually means you have to re-shim your head to relieve some compression and drop your GP heat range down as well. At least it used to. I know many people run 33% in their TRX engines in stock form. Then again... not sure how many of those see a 5+ gallon life out of their engines. ;)
 
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