Best car heater....to clear windscreen
in [Car Maintenance]
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From: Adrian on 7 Jan 2010 09:09 "Mrcheerful" <nbkm57(a)hotmail.co.uk> gurgled happily, sounding much like they were saying: > The newer the vehicle the quicker it will defrost Not necessarily. FWIW, the Saab is quick, but you'd expect that.
From: Mrcheerful on 7 Jan 2010 09:22 Adrian wrote: > "Mrcheerful" <nbkm57(a)hotmail.co.uk> gurgled happily, sounding much > like they were saying: > >> The newer the vehicle the quicker it will defrost > > Not necessarily. > > FWIW, the Saab is quick, but you'd expect that. the amount of water in the heads of newer engines has been reduced to improve the warm up time of the engine so that emissions are reduced, so 'in general' the newer the vehicle the quicker the heater gets hot. Oh yes, some diesels have heater plugs (three or four) in the water jacket to get the engine up to temp. quicker, so the op might be able to add those to his (diesel) vehicles.
From: Adrian on 7 Jan 2010 09:32 "Mrcheerful" <nbkm57(a)hotmail.co.uk> gurgled happily, sounding much like they were saying: >>> The newer the vehicle the quicker it will defrost >> Not necessarily. > the amount of water in the heads of newer engines has been reduced to > improve the warm up time of the engine so that emissions are reduced, so > 'in general' the newer the vehicle the quicker the heater gets hot. OTOH, greater efficiency - especially with common-rail diesels - reduces the amount of heat getting to the coolant, which is why a lot of common- rail diesels have auxiliary fuel-burning heaters for the cabin.
From: Mrcheerful on 7 Jan 2010 13:28 Adrian wrote: > "Mrcheerful" <nbkm57(a)hotmail.co.uk> gurgled happily, sounding much > like they were saying: > >>>> The newer the vehicle the quicker it will defrost > >>> Not necessarily. > >> the amount of water in the heads of newer engines has been reduced >> to improve the warm up time of the engine so that emissions are >> reduced, so 'in general' the newer the vehicle the quicker the >> heater gets hot. > > OTOH, greater efficiency - especially with common-rail diesels - > reduces the amount of heat getting to the coolant, which is why a lot > of common- rail diesels have auxiliary fuel-burning heaters for the > cabin. which is why I said that petrols warm quicker than diesels. One of the parts of my service schedule is to check the engine fan operates, this is often quite difficult to get going on modern diesels, unless the day is really hot the fan won't come in even when left idling for half an hour or so after a run.
From: Tom on 7 Jan 2010 13:43
On Thu, 07 Jan 2010 01:56:15 -0000, "Duncan Wood" <nntptmp(a)dmx512.co.uk> wrote: >On Thu, 07 Jan 2010 00:11:08 -0000, Richard Crewe ><richardSOCKS.crewe(a)sniff-thetrousers.demon.co.uk> wrote: > >> On 06/01/10 16:49, Tony (UncleFista) wrote: >> ------8<-- snip snip --8<----- >>> >>> It's possible to buy small 12v screen demisters, a bit like hairdryers, >>> to clear kitcar windscreens (with no heater). >>> Available from kit car bits suppliers, dunno whether they're any good >>> though :) >>> >>> Like this; >>> http://www.cbsonline.co.uk/electric-demist-heater--demst-309-p.asp >>> >> >> I have a pair of 12V hair-dryers on my kit-car, they are pretty much >> useless for demisting in an open top car and are only there to meet SVA >> regulations. They may be better in an enclosed space though, but I can't >> imagine how they could practically be used to dry any amount of hair. >> >> My tip for defrosting an icy windscreen is to use _lukewarm_ salty >> water. This melts the ice and warms the screen enough to reduce misting. >> The salt prevents it freezing on the screen and on the ground where it >> eventually drains. There's the risk that if the water's too hot, the >> thermal shock will crack the screen. >> >> -- >> Rich >> > >It's a pretty minor risk though or driving through puddles in the summer >would shatter your windscreen. It's the sudden difference in temperature that cracks glass, i.e. from freezing to very hot instantly. Driving through a puddle in the summer is by no means a fair comparison. |