Cox Engines Forum
You are not logged in! Please login or register.

Logged in members see NO ADVERTISEMENTS!


Weak glow plugs Cox_ba12




Weak glow plugs Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Introducing our Cox .049 TD Engines
by Yabby Today at 10:03 pm

» Another of C.T. engines cleaned ---- Cox Tee Dee .09 --- Just today (3/26/2024) more Cox parts
by Yabby Today at 9:49 pm

» STUKA bomb dimentions needed
by latole Today at 9:14 pm

» Indexing COX cylinders
by balogh Today at 4:40 pm

» 1/2a Skyray plans?
by 944_Jim Today at 1:44 pm

» Postage stamp backplates
by JPvelo Today at 12:22 pm

» my attempt at making an exhaust throttle for Cox .049
by roddie Today at 11:50 am

» Cosmic Winds, - Big Guy, Little Guys, Silver Guy and Wounded Guy.
by rsv1cox Today at 8:48 am

» My friend Ramón, his Cox .09 & Cox .010
by MauricioB Today at 4:01 am

» Parts Cox TD-4
by rsv1cox Today at 12:10 am

» On ebay a very special Cox engine
by davidll1984 Yesterday at 10:02 pm

» Introducing the new - "QZ" RR-1
by Admin Yesterday at 4:21 pm

Cox Engine of The Month
March-2024
balogh's

"COX Budapest" .049 engine



PAST WINNERS
CEF Traveling Engine

Win This Engine!
Gallery


Weak glow plugs Empty
Live on Patrol


Weak glow plugs

Go down

Weak glow plugs Empty Weak glow plugs

Post  RknRusty Mon Dec 19, 2011 3:21 pm

I installed a glow plug that glowed brightly in an engine that I had used blue Permatex thread locker for the tank screws (not the one I carefully built last night, letting the thread locker set, this was a quick job I did today). Being the impatient guy that I am, I slapped it straight onto the test 2x4 and cranked it up. It ran out the tank and wouldn't start again. I removed the head and plugged in the battery and there was no glow. It had a bright glow before I installed it. Hmmm, Permatex? I took a syringe full of alcohol and blasted the coil, dried it, and hooked up the battery. And whaddya know, red hot. It cranked and ran fine for 4 more tanks.

Okay then, I have a few more that won't glow, so I gathered them up and cleaned them the same way and they all lit perfectly, even the old W filament that I thought was dead years ago. Some were relatively new and some were decades old. Under the magnifying glass, one of the newer ones had a pink glob that looked the color of Glowplugboy fuel. None of the rest looked contaminated, a couple were less than shiny.

For the life of me and my electronic engineering background, I cannot explain what may have been coating them that was conductive enough to short circuit the coils(except the one that was touching the side of its enclosure). But the moral of the story is, shoot your plugs with denatured alcohol occasionally whether they need it or not.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-11
Age : 68
Location : South Carolina, USA

Back to top Go down

Weak glow plugs Empty Scotch

Post  John Goddard Tue Dec 20, 2011 3:21 am

I haven't got any Meths (denatured) Rusty but I've got some single malts around my office
do you reckon it's worth a try?
J
John Goddard
John Goddard
Diamond Member
Diamond Member

Posts : 2447
Join date : 2011-11-24
Age : 59
Location : Leyton North East London

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  RknRusty Tue Dec 20, 2011 3:25 am

John Goddard wrote:I haven't got any Meths (denatured) Rusty but I've got some single malts around my office
do you reckon it's worth a try?
J
Weak glow plugs Icon10 You might want to distill it first.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-11
Age : 68
Location : South Carolina, USA

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  John Goddard Tue Dec 20, 2011 3:32 am

RknRusty wrote:
John Goddard wrote:I haven't got any Meths (denatured) Rusty but I've got some single malts around my office
do you reckon it's worth a try?
J
Weak glow plugs Icon10 You might want to distill it first.

Unfortunately I'd feel compelled to drink it then.

Very Happy
John Goddard
John Goddard
Diamond Member
Diamond Member

Posts : 2447
Join date : 2011-11-24
Age : 59
Location : Leyton North East London

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  andrew Tue Dec 20, 2011 4:40 am

RknRusty wrote:I took a syringe full of alcohol and blasted the coil, dried it, and hooked up the battery. And whaddya know, red hot. It cranked and ran fine for 4 more tanks.

...............Under the magnifying glass, one of the newer ones had a pink glob that looked the color of Glowplugboy fuel. None of the rest looked contaminated, a couple were less than shiny.

That's an interesting result.

Over the last few years, I've been flying almost exclusively (please don't string me up for this) NORVELs. There was a lot of discussion (some has shown up here) on the use of rubber fuel bulbs or syringes with black rubber seals and the contamination of glowplug elements. On some of my high time engines, while the plug still heated and functioned, close examination of the elements showed a deposit that looked almost like white fur growing out of the element. Since some of these engines had been fueled only with an all nylon syringe, I assumed that the deposit was from some other contaminant.

I never thought of using alcohol or acetone to try to clean it. It certainly will be worth experimenting with a couple of solvents to see if I can remove it -- I can't help but think that a clean element should improve running. Some of you with a better chemistry background may be able to explain it, but it is my understanding that ignition is due to catalytic action and that plug heat only serves to accelerate the reaction. If that's the case, then anything that coats the element would tend to block or slow down ignition.
andrew
andrew
Diamond Member
Diamond Member

Posts : 1807
Join date : 2011-08-11
Age : 76
Location : Western Kentucky

http://web2.murraystate.edu/andy.batts/ps/POWERSUPPLY.HTM

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  RknRusty Tue Dec 20, 2011 4:58 am

My son the Chemist will be home this coming weekend. I'll ask him about it. And the best cleaning method. Meanwhile, here's some interesting info about the stuff of which our plugs are made:
http://www.periodicvideos.com/videos/078.htm

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-11
Age : 68
Location : South Carolina, USA

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  PV Pilot Tue Dec 20, 2011 5:16 am

I used Hydrofluoric acid to clean a old supposedly dead, no-glow standard plug. the thing lit up nice and bright and I ran the old 1952 motor with it. Don't know how old the plug was, but it would not light when I tried intitally.
PV Pilot
PV Pilot
High Tech Balsa Basher
High Tech Balsa Basher

Posts : 1854
Join date : 2011-08-11
Age : 57
Location : The ragged end of the Universe.

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  microflitedude Tue Dec 20, 2011 5:29 am

If I think a head is dead, I make sure the element is centered and is broken before doing something to it. Smile I have had one go out, it was broken in the middle of the coil.

Good idea with cleaning them.
microflitedude
microflitedude
Top Poster
Top Poster

Posts : 3417
Join date : 2011-08-17
Age : 26
Location : Columbia, SC

https://www.facebook.com/MiniCub?fref=ts

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  RknRusty Tue Dec 20, 2011 7:05 am

If you use acid it probably etches the platinum a little bit. And you'd need to neutralize it if you aren't going to use it in a few minutes. I'll have to ask my chemist what to use for that. Sodium hydroxide maybe, but I forgot how to make it. I'll have those answers this weekend.

_________________
Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!


My Hot Rock & Blues Playlist
RknRusty
RknRusty
Rest In Peace
Rest In Peace

Posts : 10869
Join date : 2011-08-11
Age : 68
Location : South Carolina, USA

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  tubebass Tue Dec 20, 2011 7:32 am

Years ago we got a batch of fuel that was killing plugs. They would still glow but the engines would not run. Switching to different fuel didn't help till we changed the glow plug. We figure the elements got coated with some foreign substance.
tubebass
tubebass
Silver Member
Silver Member

Posts : 75
Join date : 2011-08-12
Age : 70
Location : Saint John, N.B, Canada

Back to top Go down

Weak glow plugs Empty Re: Weak glow plugs

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum