R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Nitro Off-Road

Reply
 
Thread Tools Search this Thread
Old 03-20-2010, 06:32 PM   #1
Tech Master
 
Join Date: Jan 2010
Posts: 1,710
Trader Rating: 119 (99%+)
Default burning through Glow Plugs

so what would cause my motor to burn through glow plugs so quickly. i have a Ninja JX21 that is about 2 1/2 gallons old and up until last night has been running flawless and was actually still on the original factory glow plug. well just last night i went through 3 glow plugs and i cant figure out why. the tune didnt change and the car was running strong all night but i had to but a brand new pkug in each time i fired up the car cuz they were burnt out. and i know it was a plug because as soon as i put a new one it she fired right up. PLEASE help plugs arent cheap and cant afford to keep going through them like that
by the way i am running an OS P3 plug in the motor and its in an xray 808 with an os 2050 pipe
skoalisbad4me is offline   Reply With Quote
Old 03-20-2010, 06:40 PM   #2
Tech Prophet
 
tc5 man's Avatar
 
Join Date: Oct 2007
Location: levittown pa
Posts: 16,873
Default

Quote:
Originally Posted by skoalisbad4me View Post
so what would cause my motor to burn through glow plugs so quickly. i have a Ninja JX21 that is about 2 1/2 gallons old and up until last night has been running flawless and was actually still on the original factory glow plug. well just last night i went through 3 glow plugs and i cant figure out why. the tune didnt change and the car was running strong all night but i had to but a brand new pkug in each time i fired up the car cuz they were burnt out. and i know it was a plug because as soon as i put a new one it she fired right up. PLEASE help plugs arent cheap and cant afford to keep going through them like that
by the way i am running an OS P3 plug in the motor and its in an xray 808 with an os 2050 pipe






if your eating throw plugs like that, than i think you might have leak somewhere.
tc5 man is offline   Reply With Quote
Old 03-20-2010, 06:41 PM   #3
Tech Champion
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 9,846
Trader Rating: 75 (100%+)
Default

check your rod for slop, that usually causes plugs to blow quickly. OS rod bushings wear somewhat quickly.
__________________
"I have no idea what you're talking about, so here's a bunny with a pancake on it's head."

In mind and body, we're all heading towards old age. It is slower to go by bike.
Davidka is offline   Reply With Quote
Old 03-20-2010, 06:42 PM   #4
Tech Master
 
Join Date: Jan 2010
Posts: 1,710
Trader Rating: 119 (99%+)
Default

no leaks, motor is all sealed up. if there was a leak the motor just wouldnt run the way it does. it screams down the back straight, drops to a perfect idle every time the tune is very good and after a 15min A main it came off the track right at 221. the motor runs flawless except for the fact that i cant keep a plug. and this just started last night
skoalisbad4me is offline   Reply With Quote
Old 03-20-2010, 06:57 PM   #5
Tech Elite
 
Join Date: Mar 2009
Posts: 3,657
Trader Rating: 5 (100%+)
Default

i had a faulty plug in my jx not to long ago. Put it in started once then burned out.

Faulty plug. Dont' know, but maybe you got a bad batch?


are you absolutley sure it's the plug? Did you check them all when you had them out of your engine?

Maybe you got some freak fuel?
__________________
"You are not understanding the fundamental principles of my fragmented personality"

Mugen
dreaux is offline   Reply With Quote
Old 03-20-2010, 06:58 PM   #6
Tech Elite
 
jpalessi's Avatar
R/C Tech Elite Subscriber
 
Join Date: Feb 2008
Location: SoCal
Posts: 4,747
Trader Rating: 55 (100%+)
Send a message via AIM to jpalessi Send a message via Skype™ to jpalessi
Default

good chance the front bearing is bad,,, common in OS engines. has the engine "backfired" at all?
__________________
Joe Alessi
www.Lucky7RC.com
jpalessi is offline   Reply With Quote
Old 03-20-2010, 07:19 PM   #7
Tech Regular
 
rotarynut's Avatar
 
Join Date: Sep 2009
Location: Duluth,Ga.
Posts: 266
Trader Rating: 30 (100%+)
Default glow plugs

I've had the same problem with my LRP.28, the orig plug lasted a full gallon, since then I've had issues with them, different brands,colds..mediums, I think what was doing was running the engine too lean, causing it to burn the plugs if it ran out of fuel or pinched the fuel line to shut it off. I'm runnung LSN a little richer than I was before,have run about a quart of fuel thru with this plug, I'll keep my fingers crossed.
__________________
Robert S.
CEN Matrix R2 1/8 Buggy, Novarossi Toronero H.E.S.Tuned 9901/41021, Hitec HS-7955TG/5625M
Losi 8ight-T 2.0,BCE chassis, Novarossi 21-7 FMS H.E.S. Tuned 2084SS/41021
Hitec HS-7955TG/5645MG - Stickman Batteries -Airtronics M11x
Traxxas Summit 1/10 on Gens Ace 2S lipos 5000mah
rotarynut is offline   Reply With Quote
Old 03-20-2010, 07:29 PM   #8
Moderator
 
J.Whiting's Avatar
 
Join Date: May 2005
Location: a very small town in wisconsin that is in the middle of absolutely no where
Posts: 4,536
Trader Rating: 57 (100%+)
Default

Quote:
Originally Posted by Davidka View Post
check your rod for slop, that usually causes plugs to blow quickly. OS rod bushings wear somewhat quickly.
ya what he says...... hi dave....

also a rich lsn and a very lean high needle will cause this... causing a false normal idle.. like rotarynut stated do a pinch test on fuel line. around 4 secs then die is what you are looking for.... for indoor nitro temps should be 180-200 if outdoor then temp is good.... jeremy
__________________
Jeremy Whiting - serpent america - desoto racing - apicco race engines - RcRenew - jconcepts - Rc Pro Products - ko propo eurus - ko propo servos - VP PowerMaster Fuels - Answer-rc usa - advantage racing products - Parma/pse bodies - serpent 811 2.1 - 811t
J.Whiting is offline   Reply With Quote
Old 03-20-2010, 07:35 PM   #9
dja
Tech Initiate
 
Join Date: Feb 2009
Location: WI
Posts: 32
Default

If you are plugging the exhaust when you shut your engine down this compresses the filament in the plug and causes it to fowl almost every time. You have to shut the engine off by stopping the fly wheel, had to do this when I switched to P3's.
dja is offline   Reply With Quote
Old 03-20-2010, 07:45 PM   #10
Tech Elite
 
madweazl's Avatar
 
Join Date: Oct 2002
Location: Woodbridge, VA
Posts: 2,578
Trader Rating: 11 (100%+)
Default

Quote:
Originally Posted by dja View Post
If you are plugging the exhaust when you shut your engine down this compresses the filament in the plug and causes it to fowl almost every time. You have to shut the engine off by stopping the fly wheel, had to do this when I switched to P3's.
Is this an OS thing? I always kill my engines by plugging the exhaust and I've only had 1 plug fail.
__________________
RadioPost
Mugen MBX7r | CRE Picco 5TR/2120 | Hitec 7950/7940
Tekno NB48 | B6 Pro/2058 | Hitec 7950/7940
Kyosho RB6 | Viper VTX10r/Reedy Mach 3 9.5 | Hitec 7940
Schumacher SX3 Pro | Viper VTX10r/Reedy Mach 2 8.5 | Hitec 7940
madweazl is offline   Reply With Quote
Old 03-20-2010, 07:48 PM   #11
Tech Lord
 
Jaz240's Avatar
R/C Tech Elite Subscriber
 
Join Date: Aug 2008
Location: Dwindle city
Posts: 12,492
Trader Rating: 52 (100%+)
Default

Quote:
Originally Posted by dja View Post
If you are plugging the exhaust when you shut your engine down this compresses the filament in the plug and causes it to fowl almost every time. You have to shut the engine off by stopping the fly wheel, had to do this when I switched to P3's.
Quote:
Originally Posted by madweazl View Post
Is this an OS thing? I always kill my engines by plugging the exhaust and I've only had 1 plug fail.

Plugging the exhaust stinger is also a great way to suck all the dirt out of your air filter and right into your engine
__________________
nothing to see here................................
Jaz240 is offline   Reply With Quote
Old 03-20-2010, 08:31 PM   #12
Tech Master
 
Join Date: Jan 2010
Posts: 1,710
Trader Rating: 119 (99%+)
Default

I never ever shut down the car by plugging the stinger. Always stop it with the flywheel. I checked the rod earlier in the week and not a bit of play. I will do the fuel line test. Maybe my tune is off. But my tune is good, any other suggestions? Maybe bad bearings?
skoalisbad4me is offline   Reply With Quote
Old 03-20-2010, 08:33 PM   #13
Tech Elite
 
jpalessi's Avatar
R/C Tech Elite Subscriber
 
Join Date: Feb 2008
Location: SoCal
Posts: 4,747
Trader Rating: 55 (100%+)
Send a message via AIM to jpalessi Send a message via Skype™ to jpalessi
Default

Quote:
Originally Posted by jpalessi View Post
good chance the front bearing is bad,,, common in OS engines. has the engine "backfired" at all?
Quote:
Originally Posted by skoalisbad4me View Post
Maybe my tune is off. But my tune is good, any other suggestions? Maybe bad bearings?
__________________
Joe Alessi
www.Lucky7RC.com

Last edited by jpalessi; 03-20-2010 at 08:54 PM.
jpalessi is offline   Reply With Quote
Old 03-20-2010, 08:55 PM   #14
Tech Adept
 
Felix's Avatar
 
Join Date: May 2005
Posts: 124
Trader Rating: 9 (100%+)
Default

If spanking plugs came outta no where try this...

Take off the head and look at the button and check for detonation(the button will look rough and so will the piston) if thats happening then thats usually from a bad bearing or con rod... and will spank plugs like crazy... hopefully you didnt drop a coil because that is common when engines get like this...
__________________
Serpent 811-T TE CLOCKED BONITO
Serpent 811-B TE SPEED
Felix is offline   Reply With Quote
Old 03-20-2010, 09:04 PM   #15
Tech Elite
 
jpalessi's Avatar
R/C Tech Elite Subscriber
 
Join Date: Feb 2008
Location: SoCal
Posts: 4,747
Trader Rating: 55 (100%+)
Send a message via AIM to jpalessi Send a message via Skype™ to jpalessi
Default

Quote:
Originally Posted by Felix View Post
If spanking plugs came outta no where try this...

Take off the head and look at the button and check for detonation(the button will look rough and so will the piston) if thats happening then thats usually from a bad bearing or con rod... and will spank plugs like crazy... hopefully you didnt drop a coil because that is common when engines get like this...
+1 most likely a bearing in this case.. OS

its sucks a $15 dollar bearing causes hundreds in pre-mature failures.

GO TKO!
__________________
Joe Alessi
www.Lucky7RC.com
jpalessi is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Burning glow plugs?? tylerp_2000 Monster Trucks 21 05-14-2009 05:50 PM
Eating through glow plugs today? A costly day.. Why? Mpowerz Nitro Off-Road 31 01-05-2008 09:20 PM
OS P3 Glow Plug Problems Jon Kerr Onroad Nitro Engine Zone 8 09-26-2007 07:32 PM
Tax Return Burning A Whole In Your Wallet Mr. Shookie R/C Items: For Sale/Trade 21 02-26-2005 07:47 AM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 09:31 PM.


Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net