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

Logged in members see NO ADVERTISEMENTS!


Cox 049 reed valve 3 fin glow heads  Cox_ba12




Cox 049 reed valve 3 fin glow heads  Pixel

Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Bird feeder, new visitor
by dckrsn Today at 4:18 pm

» Sportsman/Olympic Aft End
by dckrsn Today at 4:08 pm

» Happy birthday Bernie
by fredvon4 Today at 2:52 pm

» How does your Garden Grow
by rsv1cox Today at 2:02 pm

» Cox Vega Funny Car - Rear Wheel Nut
by Marleysky Today at 12:17 pm

» Iced Tea Help Please......
by Marleysky Today at 12:14 pm

» Jerobee how To save how to fix a broken frame
by Marleysky Today at 12:12 pm

» New project... Loop Graupner "Glow"
by MauricioB Today at 10:32 am

» Old School ?
by Scratch049 Today at 8:35 am

» **VOTE-ON-THE-NEXT-COX-ENGINE-OF-THE-MONTH** (May 2021)
by dckrsn Yesterday at 7:29 pm

» Fokker V.23 + MARZ 2.5D
by getback Tue May 04, 2021 8:24 am

» American Pickers And Airplanes
by OhBee Tue May 04, 2021 3:21 am

Cox Engine of The Month
April-2021
fredvon4's

Finely polished Cox .049 with exhaust collector.




PAST WINNERS
CEF Traveling Engine

Win This Engine!
Forum Store
CEF Ear Savers
Gallery


Cox 049 reed valve 3 fin glow heads  Empty

Cox 049 reed valve 3 fin glow heads

Go down

Cox 049 reed valve 3 fin glow heads  Empty Cox 049 reed valve 3 fin glow heads

Post  Coxfledgling Sun Mar 21, 2021 6:31 am

Would someone know the Cox part number for the standard Cox 049 reed valve 3 fin glow head, and, what is the resistance value when the glow head is serviceable please.

I need to check all the fitted glow heads and am not set up for "live" testing yet, so was thinking a quick resistance check first.

Obviously an infinite reading means a dead glow head, which may have an afterlife as I "converted" one to a glow plug head about 22 years ago that seems to work fine as it was run up from storage late 2019, then covid hit.

All help greatly appreciated.
Coxfledgling
Coxfledgling
Silver Member
Silver Member

Posts : 92
Join date : 2021-01-10

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  balogh Sun Mar 21, 2021 10:46 am

I think the typical current a Cox glow head takes is about 2.5....3 Amps. This is the current range I use with a starting panel.
Cox 049 reed valve 3 fin glow heads  Screen36

So if you use 1.5 Volts D cell batteries to start your COX, then
R=U/I = 1.5/(2.5...3) = 0.5....0.6 ohm...
balogh
balogh
Top Poster
Top Poster

2019 Supporter

2020 Supporter

Posts : 3373
Join date : 2011-11-06
Age : 62
Location : Budapest Hungary

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  KariFS Sun Mar 21, 2021 1:23 pm

It’s just like Andras figured:

Cox 049 reed valve 3 fin glow heads  F7cf0610

The reading fluctuated from 0.2 to 0.5 ohms, but that’s probably because my multimeter is not a very high-precision instrument.
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1741
Join date : 2014-10-10
Age : 49

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  balogh Sun Mar 21, 2021 2:17 pm

Thanks Kari..this is one of those rare moments when empirical results and theoretical science resonate Very Happy
balogh
balogh
Top Poster
Top Poster

2019 Supporter

2020 Supporter

Posts : 3373
Join date : 2011-11-06
Age : 62
Location : Budapest Hungary

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  fredvon4 Sun Mar 21, 2021 2:38 pm

In this case the answer is IT DEPENDS

Resistance is variable with temperature

and don't forget that even a bright glowing filament my not run without current if the Catalyst is eroded or depleted or covered with 'Taters: Thus a bright glow or continuity is not a perfect indication of a GOOD glow plug
fredvon4
fredvon4
Top Poster
Top Poster

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 3446
Join date : 2011-08-26
Age : 65
Location : Lampasas Texas

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Fledgling

Post  Coxfledgling Sun Mar 21, 2021 2:43 pm

Thanks guy's, a good starting point at any rate.

Please what are taters ?

Yes I suppose the acid test is will the engine start ...
Coxfledgling
Coxfledgling
Silver Member
Silver Member

Posts : 92
Join date : 2021-01-10

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  KariFS Sun Mar 21, 2021 3:01 pm

@balogh wrote:Thanks Kari..this is one of those rare moments when empirical results and theoretical science resonate Very Happy

I must admit I had to wait a while for the meter to read the ”correct” value before documenting Very Happy (Learnings from Laboratory Work 101)

Fred is right though, the only thing the measurement indicates, is that there is continuity similar to an unused OEM plug. If the platinum is gone, it’ll only glow when the battery is connected. Also the filament should be clean of course.

’Taters I think means potatoes. ’Maters are tomatoes... Learnings from hanging out here at CEF This Site Rocks! Not sure what taters have to do with glow plugs though Huh...
KariFS
KariFS
Diamond Member
Diamond Member

Posts : 1741
Join date : 2014-10-10
Age : 49

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  fredvon4 Mon Mar 22, 2021 10:46 am

A few years back certain fuels had some sort of contaminant that would "grow" on the filament and had to be carefully chipped off with a tip of Xacto knife.....usually destroying the filament. If I recall correctly it was one of the Sig fuels used for stunt but not sure of the brand. Over time described as "    'taters" .  Seen as a Blob of whitish-grey very hard contaminant "bead" built up near the weld to the plug.....mostly low nitro and hot plug
fredvon4
fredvon4
Top Poster
Top Poster

2019 Supporter

2020 Supporter

2021 Supporter

Posts : 3446
Join date : 2011-08-26
Age : 65
Location : Lampasas Texas

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Fledgling

Post  Coxfledgling Mon Mar 22, 2021 2:51 pm

Ahhhh, "whisker" like a 2t petrol....possibly...

One of the td09 heads glows but the engine doesn't run well, and seems to have a white " something" in the filament coil, that I don't want to touch as the coil would probably get broken....

I have 2 new heads, I have modified a dead 049 head to a glow plug many many years ago that seemed to work ok....
Coxfledgling
Coxfledgling
Silver Member
Silver Member

Posts : 92
Join date : 2021-01-10

Back to top Go down

Cox 049 reed valve 3 fin glow heads  Empty Re: Cox 049 reed valve 3 fin glow heads

Post  Sponsored content


Sponsored content


Back to top Go down

Back to top


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