#1
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Oil Pan heater
I just bought one of these. Its only 125W and its the 12V version.
I don't expect great results but I am hoping it will raise the oil temperature a bit on those cold days. Right now its set up to run from an external 12V battery, I don't want to kill the starter battery (its on its last legs). There is a 250W 240V model, but I don't have easy access to a plug so I'm going to try this smaller model first. Also, I ignored the instructions step where it says sand the paint off your oil pan. No thanks! I think it will be ok, and if the heater fails that's preferable to ruining the oil pan. I'll post up results when I get a chance to try it. Last edited by Goran; 20th October 2014 at 07:50 PM. |
#2
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I do not think 125W will make any difference, specially as it's not insulated in any way. Back in Latvia we had 2x 3kW heater coils from industrial boiler DIY mounted inside the sump of tractor, that was because the old USSR oils turned to gel at -30C and pump would not pick it up at all. It was taking a good hour to raise oil temperature near 0C at those conditions on the insulated sump.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#3
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It'll only make a difference if running all the time from an external power supply, maybe enough to raise the temperature a few degrees.
Remember an A8 engine is typically 200 to 300kW and this is just a couple of light bulbs.
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later) 1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! |
#4
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Might consider something like this coolant heater for VW diesels but use it somewhere in the oil flow: http://www.ebay.co.uk/itm/GENUINE-VW...item4d14c417c4
It uses 3 glow plugs each 140-150W
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
#5
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Try grabbing a 125w light bulb, its quite hot so i would have thought that this pad would raise it a bit, no?
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Del |
#6
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Indeed, a bit.
Do the maths; given how much oil is in an A8 engine, maybe a "handful" of degrees in an hour. And most of that would conduct away into the much bigger mass of the engine block. So a little bit. Eventually.....
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation". (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one! Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course. (internal dimming mirror added later) 1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! |
#7
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Quote:
I don't expect much, it is only 125W. Back of cigarette packet calculation, specific heat of engine oil is around 2000J per kg to raise by 1C, lets assume density is 1kg per dm3 (although its less), so 7.5l x 2000 = 15000J to raise by 1C. 15000/125 = 120sec to raise by 1C. If I want to raise by 10C it should take 20minutes. But lets say only half the area of the pad heats the oil, the other half is wasted, so perhaps 40 minutes to raise temp by 10C. But this excludes the volume of oil pan, etc, so probably a lot longer. I'll give it a go and let you know what happens. |
#8
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I love it when it gets super geek.
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Del |
#9
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First attempt - fail. So much for theory
VCDS oil temperature at start: 11C VCDS oil temperature after 20minutes: 11C It was the battery's fault anyway. 12V 7.2Ah Aino Micro could not even supply 8A without its voltage collapsing to around 6V after only 10 minutes. I left it connected for just over 20 minutes anyway. Current dropped to below 6A, so that's around 36W input. After load was removed it recovered back to 12.3V Next time I will try a proper starter battery with more capacity. |
#10
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Pretty much as I predicted. You already have auxiliary heater which provides 5kW of heat. You just need to get that heat from coolant to the oil. Possibly auxiliary electric oil pump and oil to water heatexchanger.
pumps: http://www.ebay.co.uk/sch/Car-Parts-...ctric+oil+pump Heat exchabnger something like this :http://www.ebay.co.uk/itm/plate-HEAT...item3ce94b3c66 Another way would be to make the oil circulate the engine while it is off but heater working but that would be bit more complicated I guess.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure |
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