R/C Tech Forums

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

Reply
 
Thread Tools Search this Thread
Old 06-23-2009, 07:46 PM   #1
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default Could a worn clutch cause blown glow plugs?

In a nutshell can a worn clutch cause blown glow plugs?

Engine was just repinched and broken in correctly. Engine is tuned WAY fat even. The engine runs pretty warm (240ish) and I'm pretty sure it's the clutch. Anyways, I blew a plug killing off the last of my clutch shoes and it killed the plug. I'm just wondering if it's from running hotter than normal or what.

When I pulled it the plug was wet and had dark marks around it, like it was running fat. Coil was shiney but the coil I guess failed internally. I tried to bent it back, but like an idiot I hooked my glow driver to the charge port of the power pannel and the plug went completely POOF while checking to see if the coil was lighting.

If it matters, it's a hyper .21. It runs pretty solid at about 210ish race tuned.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-23-2009, 07:52 PM   #2
Tech Adept
 
tonydig11's Avatar
 
Join Date: Jun 2009
Location: pittsburgh pa
Posts: 219
Trader Rating: 21 (100%+)
Default

if the clutch slips it makes heat witch makes the temp go way up even if your rich.
tonydig11 is offline   Reply With Quote
Old 06-23-2009, 07:54 PM   #3
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by tonydig11 View Post
if the clutch slips it makes heat witch makes the temp go way up even if your rich.
Right, and I'm wondering if that will blow the plug. You can have a rich top, lean bottom and it will still blow plugs, even though the temps are ok.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-24-2009, 12:35 AM   #4
Tech Master
 
Join Date: Feb 2008
Location: Ontario, Canada
Posts: 1,210
Trader Rating: 3 (100%+)
Default

You may also blow it by overcompensating your needle settings to remedy the performance changes of a bad clutch...
__________________
Team HRC Raceway - http://www.hrcraceway.ca/
Semple is offline   Reply With Quote
Old 06-24-2009, 12:55 AM   #5
Tech Champion
 
losi_racer's Avatar
R/C Tech Elite Subscriber
 
Join Date: Nov 2008
Location: mesa,az
Posts: 6,470
Trader Rating: 25 (100%+)
Default

your at 240 and its way rich you say? somethings wrong there, what it run before?
__________________

Byron Fuels/AKA Tires/Radiopost/TKO/Viper Rc/Dialed Inc/Empire Metal Product/Advantage Racing Products
losi_racer is offline   Reply With Quote
Old 06-24-2009, 01:09 AM   #6
Tech Master
 
markt311's Avatar
 
Join Date: Aug 2008
Location: Nashville Tennessee
Posts: 1,368
Trader Rating: 32 (100%+)
Default

sounds like it's lean on the bottom and a little rich on top to me

240, but a rich looking plug. it's got plenty of gas at WFO
__________________
PR Racing Bellgate Distributors
Caster Racing Parts
311 RC Graphics
markt311 is offline   Reply With Quote
Old 06-25-2009, 11:19 AM   #7
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by markt311 View Post
sounds like it's lean on the bottom and a little rich on top to me

240, but a rich looking plug. it's got plenty of gas at WFO
It's rich on the bottom. I promise.. throwing tons of smoke.

It's running 240 rich because of the worn clutch shoes.

I'll pick up some plugs and some new shoes, maybe tomorrow.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-25-2009, 02:56 PM   #8
Tech Lord
 
wingracer's Avatar
 
Join Date: Nov 2007
Posts: 12,785
Trader Rating: 23 (100%+)
Default

You say it was just re-pinched but was the rod replaced? 9 times out of ten, blown plugs mean worn rod bearings or stretched rod.
__________________
Sean. Certified speed crazed mowron.
Team Shepherd USA
www.ashfordhobby.com
wingracer is online now   Reply With Quote
Old 06-25-2009, 03:17 PM   #9
Tech Champion
 
JAMMINKRAZY's Avatar
 
Join Date: Jun 2007
Location: Pittsburgh PA
Posts: 6,575
Trader Rating: 17 (100%+)
Default

Quote:
Originally Posted by wingracer View Post
You say it was just re-pinched but was the rod replaced? 9 times out of ten, blown plugs mean worn rod bearings or stretched rod.
+1 or worn rear bearings. Pinching will give you new engine compression, but not a new engine. If the rod or bearings are worn, the engine is still owrn out even with a pinch. To me it sounds like the clutch is causing most of the issues. Get some new shoes and springs and try again. I would also suggest checking the rod and rear bearing for signs of wear. I do however feel it's probably all being caused by the clutch. A slipping clutch will heat an engine up no matter what the tune is. You probably killed the plug with the super rich settings trying to compensate for the clutch slippage. My 2 cents.
__________________
-Koby Kubrin-
Thanks to my Sponsors:
Serpent America | Team Novarossi | Desoto Racing | Race AKA | Ridgeway Bodies
JAMMINKRAZY is offline   Reply With Quote
Old 06-25-2009, 07:03 PM   #10
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by JAMMINKRAZY View Post
+1 or worn rear bearings. Pinching will give you new engine compression, but not a new engine. If the rod or bearings are worn, the engine is still owrn out even with a pinch. To me it sounds like the clutch is causing most of the issues. Get some new shoes and springs and try again. I would also suggest checking the rod and rear bearing for signs of wear. I do however feel it's probably all being caused by the clutch. A slipping clutch will heat an engine up no matter what the tune is. You probably killed the plug with the super rich settings trying to compensate for the clutch slippage. My 2 cents.

It got a rod and a new front bearing, rear bearing was fine. Carb got a complete reseal and I sealed the carb base and backplate. I'm not a total newb.

Gonna go to the LHS and pick up some clutch shoes tomorrow and report my findings.

I was hoping to recieve my V-spec in the mail today but apparently this guy wants to screw me over. I was planning on just running the V-spec with new shoes and putting away the Hyper for a while.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-25-2009, 08:17 PM   #11
Tech Champion
 
Davidka's Avatar
 
Join Date: Oct 2004
Posts: 9,846
Trader Rating: 75 (100%+)
Default

The clutch has absolutely nothing to do with glow plugs wearing out prematurely. It's more likely something in the engine itself. Either your rear bearing has developed play (only takes a tiny bit). Something is loose and your piston is not traveling up and down accurately. Could also be your head squish/deck height is too low (if you left out a shim or something)
Davidka is offline   Reply With Quote
Old 06-26-2009, 08:52 AM   #12
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Quote:
Originally Posted by Davidka View Post
The clutch has absolutely nothing to do with glow plugs wearing out prematurely. It's more likely something in the engine itself. Either your rear bearing has developed play (only takes a tiny bit). Something is loose and your piston is not traveling up and down accurately. Could also be your head squish/deck height is too low (if you left out a shim or something)
All that stuff you just listed checks out ok. Maybe I need to add another head shim.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-28-2009, 10:55 AM   #13
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Haha.. oh man

I got a set of KHZ 7075 clutch shoes.

I didn't realize how worn out my old ones were. Once I got it started and running well it ended up being way fat on the bottom and lean on the top. I never really speed run it so I guess that's why my plug looked like it was running fat but it blew that plug. I ended up richening the top a lot and leaning the bottom a ton. it's throwing more smoke now and it accelerates a hell of a lot faster.

What was wierd was that the clutch bell wasn't blue or showing signs of overheating.

Note to self.. I can't dremel out the shoe to clear the clutch spring 3 times to compensate for wear, haha.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Old 06-28-2009, 11:06 AM   #14
Tech Fanatic
 
Join Date: Apr 2009
Location: SL,UT
Posts: 938
Trader Rating: 49 (100%+)
Default

Oh, the reason my tune was effed up was because the gasket between my pipe and header was toast, so it was a combination of things.
__________________
-Mike B. - TLR22 - Tekin - K.O propo
aradaiel is offline   Reply With Quote
Reply



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 06:59 PM.


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