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Cox 049 reed valve 3 fin glow heads
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Cox 049 reed valve 3 fin glow heads
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.
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- Gold Member
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Location : Near Caernarfon, Snowdonia, Wales, UK
balogh- Top Poster
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Location : Budapest Hungary
KariFS- Diamond Member
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Re: Cox 049 reed valve 3 fin glow heads
Thanks Kari..this is one of those rare moments when empirical results and theoretical science resonate
balogh- Top Poster
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Location : Budapest Hungary
Re: Cox 049 reed valve 3 fin glow heads
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
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- Top Poster
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Fledgling
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 ...
Please what are taters ?
Yes I suppose the acid test is will the engine start ...
Coxfledgling- Gold Member
- Posts : 375
Join date : 2021-01-10
Location : Near Caernarfon, Snowdonia, Wales, UK
Re: Cox 049 reed valve 3 fin glow heads
balogh wrote:Thanks Kari..this is one of those rare moments when empirical results and theoretical science resonate
I must admit I had to wait a while for the meter to read the ”correct” value before documenting (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 Not sure what taters have to do with glow plugs though
KariFS- Diamond Member
- Posts : 2005
Join date : 2014-10-10
Age : 52
Re: Cox 049 reed valve 3 fin glow heads
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- Top Poster
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Fledgling
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....
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- Gold Member
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Join date : 2021-01-10
Location : Near Caernarfon, Snowdonia, Wales, UK
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