Quote:
Originally Posted by ainarssems
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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I like these stories from the USSR. My dad told me in Russia, and even in Serbia truck drivers used to light a fire under the oil sump (or maybe under the diesel tank?) on those cold -20 or -30 days.
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.