Glow Plug for WVO heater on continuously?

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Glenn's picture
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Joined: 05/28/2004

Concerning using a glow plug (GP) as a WVO heater installed just prior to the IP:

Has anyone had sustained success using a GP in constant duty (always switched on for hours)?

Seems to me that GPs were designed for short duty cycles to aid starting only.

If a GP is to be used as a WVO heater, naturally it would need to be on almost continuously?

Anyone have a thoughts on this?

Thanks, Glennnnnnnnn

Donniej's picture
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Joined: 01/07/2005

Here's an IDEA for you... before someone chimes in about how I need to add a disclaimer and that I haven't built and tested this device for 6 months in a UL listed lab, I'll mention that it's just my IDEA (-:

What's I've been thinking about is a glow plug (or a few glow plugs) in a piece of water pipe (1" or 2" X 6"). Rules of convection reccoment that with the pipe vertical the glow plugs should be at the bottom and flow should come in the bottom and exit at the top.

You can wire it up direct to a switched ignition source that can spare the extra load or wire up your own relay setup. You could also find an auto temp sensor for a dummy light or fan switch and thread a hole into the pipe for it... then wire the fan switch to the relay. Since the fan switches are normally open you'll probably need to find an SPDT relay and wire the glow plugs to the side that's hot when the relay is energized.

Glow plugs are really cheap ($16 each for OEM Bosch for the BMW), if you wire one direct and put it in a pool of grease it should give you an idea of its longevity...

If you understand that much then you can probably figure out the rest.

-------------------------
Her
"Do I smell McDonalds?"
Me
"No, that's my Bimmer"...
Her
"Will it make me fat?"
Me
"You're already fat"

TDIguy's picture
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Joined: 06/07/2004

I know everyone is into cost cutting but really now you are dealing with stuff that if you go really wrong you cause a carfire thats not easy to put out at all. I would consider the fact that a veg therm without bells or whistles is 100$ install it right and install it once and its a self regulating heat boost needed with the GC kit hard to go wrong and it involves no experimenting or wondering if it will work its going to work and work well every startup just wire up 1 wire from the pollack valve as a signal wire to a relay 1 wire from a power source and 1 wire to ground and of course a realy and whala every time you switch over to veg oil your veg therm is on and boosting the temp of that veg oil when not on veg oil the veg therm is off.

Glenn's picture
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Joined: 05/28/2004

Thanks guys,

I like the idea of a simple n inexpensive on demand additional heat just prior to my IP.

I like the idea of an inexpensive glow plug or two heating the WVO n the low amps it draws.... BUT I do like the
vary thought of a GLOW of hot metal in my flammable oil stream under the hood of my car sitting in my garage un
attended......

TDIGuy,
Is this the Vegi-Therm you were talking about displayed on web page
http://order.kagi.com/cgi-bin/store.cgi?storeID=K6F&&
Described as below?
HEATING TUBE ONLY: VEG-Therm Standard SVO and Biodiesel Heater, 12V USD 109.00

The cost is ok but I think I read it uses 20 amps??????

From what I have read in this form, we are all looking for 170 n above WVO temps. just prior to the IP. I have also
read the Grease Car kit as delivered from the manufacture does not deliver this temp. even in the summer, let
alone in the winter..........

Do you experienced guys agree with this newB's conclusion about low than acceptable WVO temps.???

Wonder if replacing the GC heated fuel filter with a RaCor electrically heated fuel filter is a good alternative?

My GC kit has yet to arrive (ordered April 20), I am just wanting/needing to install it properly the first time and
honestly not sure how n what to do at this point.

TDIguy's picture
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Joined: 06/07/2004

Yes i think it draws a max current of 20amps thats while its heating up and it doesnt include any wiring so if you know how to wire something its no problem at all there are kits with the veg therm that sell for about 150$ but there is no need to pay that much extra for what you get in the kit. Remeber its 20amps max draw thats when it is first heating up its self regulating so it won't constantly be drawing 20amps and your factory alternator can very easily handle a 20 amp load there are aftermarket radios out there that draw far more that people put in there cars.
I can vouch that the GC kit does not get the temp up past 150 right now in this semi warm weather so more heat is needed and my readings come right from the car cpu so the temp reading must be from a sensor on the ip or on the injector (not sure yet just where that sensor is should look it up in my beantly manueal :) ) If you are in MA near the 02702 area code i will gladly connect up my vag-com to your car and show ya the readings you get if you want to try different fuel heaters for my money tho and the cheap filters the GC kit uses its easy to make the investment in the vegtherm heater. I have not gotten my car back from the shop so i have yet to install it and get readings to post but once i do i will.

danalinscott's picture
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Joined: 12/13/2004

My glow plug VO heater incorpporates an adjustable thermostat to prevent overheating. It uses a model of glowplug which though it costs under $10 lasts for years in this application. Glowplug fuel heaters are simple and cheap to make. But I advise against installing them betweent he filter and IP. In operation they can build up thin coatings of carbon which can flake off and might harm an IP. Best to place them before the filter..or actually in the filter.

-------------------------
danalinscott@yahoo.com

Donniej's picture
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Joined: 01/07/2005

Quote:
Originally posted by: danalinscott
My glow plug VO heater incorpporates an adjustable thermostat to prevent overheating. It uses a model of glowplug which though it costs under $10 lasts for years in this application. Glowplug fuel heaters are simple and cheap to make. But I advise against installing them betweent he filter and IP. In operation they can build up thin coatings of carbon which can flake off and might harm an IP. Best to place them before the filter..or actually in the filter.

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danalinscott@yahoo.com
Good point, I can visualize little specs of carbon crap forming from the heat...

Putting it in the filter housing before the element is a great idea.

-------------------------
Her
"Do I smell McDonalds?"
Me
"No, that's my Bimmer"...
Her
"Will it make me fat?"
Me
"You're already fat"

rkpatt's picture
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Joined: 11/05/2004

Just curious about glow plug tip maximum temps -for 24 volt glow plugs used on 12 volts and 2 12 volt glow plugs connected in series vs the 12volt on of 12volt of 900 or degrees F ? - thanks

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Glenn's picture
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Joined: 05/28/2004

Yes, and I will defiantly place the aux. WVO heater installed B 4 the filter.

HOWEVER

W/the aux. heater placed up stream of so much thermal mass (fuel, piping n housing) B 4 the fuel arrives to the IP. The glow
plug now needs to use it's limited BTUs to heat up so more structure n fuel B 4 the fuel arrives at the IP.

Wonder if a simple in-line fuel filter placed in-between the GP n IP after GC's filter/heater would snatch out the impurities that
develop from the scolding of the WVO as it is heated by the hot end of the GP?????

This "burn free fuel" thing is not too free tiz tit!