Goin' through glow plugs
#1
Tech Initiate
Thread Starter
Goin' through glow plugs
Just started in this nitro thing and I have a problem. I am going through glow plugs big time. I am only getting a tank or two before they aren't glowing anymore .I went through two tonight. I don't think it's leaned out or anything, the temp is pretty good when I am done. The engine is a well used hyper 21, and the plugs are MC Coy mc-8's
#2
probably running it too rich....what is your enigne temp after about 5 minutes?
#3
Tech Initiate
Thread Starter
barely 200 degrees
#4
Tech Initiate
Thread Starter
what should a glow plug look like after its been run ? kinda like a spark plug dry and carboned a little?
#5
200 for a .21 seems way to low...try leaning that baby out a little ...i think that might solve your glow plug problem you probably want to go at least another 35-40 degress hotter.
#6
Originally Posted by sheveman
what should a glow plug look like after its been run ? kinda like a spark plug dry and carboned a little?
#7
Tech Initiate
Thread Starter
I picked up the engine used so I don't really know how old it is. yes there is smoke coming from exhaust. I am running 30% fuel, that is what the guy i got from told me to use
#8
I ran a hyper 8 port last season with mc-8's with no prob. It sounds like your rich. My hyper 8 port liked to run around 260 degrees. My plugs would last for weeks. Good luck with it.
#9
Try a Odonnell 99.
#10
When I was going through glow plugs, it was actually my "power panel" (you know the one on the ofna starter boxes) had gotten damaged (fuel probably) and was sending way too much voltage to the glow plug... poof...
Now I ONLY use the battery powered, handheld one's. Problem solved.
It seems that even a poorly tuned moter won't blow a glow plug in one night of racing, but sending way too much voltage to it will blow it quite quickly.
Now I ONLY use the battery powered, handheld one's. Problem solved.
It seems that even a poorly tuned moter won't blow a glow plug in one night of racing, but sending way too much voltage to it will blow it quite quickly.
#12
The OS.8 plugs you have been using are just about perfect for a .12 CVR.The MC59 doesn't sound right with a CVR running on 20% but just for other suggestions the OS.A3 and HPI R3 and R4 should work with the CVR.
Sean
Sean
#13
Tech Adept
EDIT: Duratrax - the MC-59 is classified as a hot plug but is designed to run with wider ranges of nitro which makes it a good equiv. for an OS 8, see link below.
The three most common causes of blowing plugs regularly are running too lean, too high of compression, or improper plug temp for the nitro percentage you're using (forsaking engine break-in's.) If your temps are accurate, it's not likely it's too lean. Running rich usually doesn't burn out plugs but it can.
Generally you pair the plug temp range with the nitro percentage you're using: high nitro=cold plug, low nitro=hot plug, with 20% being "medium." The plug temp changes the ignition point of the engine, much like altering timing on a full-scale. Your MC-8 should be right on for that being cool to medium with 30%, but you could try an MC 9 or OS 5. Additionally a cold plug will outlast a hot one due to the thicker element.
If all lese fails you could **try** a hotter plug just to see how it fares, if you bought it used maybe someone's fiddled with the head clearance.
Good page on plug temps
Originally Posted by sheveman
... I am running 30% fuel, that is what the guy i got from told me to use
Generally you pair the plug temp range with the nitro percentage you're using: high nitro=cold plug, low nitro=hot plug, with 20% being "medium." The plug temp changes the ignition point of the engine, much like altering timing on a full-scale. Your MC-8 should be right on for that being cool to medium with 30%, but you could try an MC 9 or OS 5. Additionally a cold plug will outlast a hot one due to the thicker element.
If all lese fails you could **try** a hotter plug just to see how it fares, if you bought it used maybe someone's fiddled with the head clearance.
Good page on plug temps