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> Electric Heat, Any good way to add it?
914fun
post Jun 28 2008, 02:11 PM
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Anyone know of a way to add electric heat and defrost? I have no heat exchangers and instead of adding them Id like to come up with a way to add some heat with electric heaters. The car will not be driven when it is very cold out.
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Cap'n Krusty
post Jun 28 2008, 03:16 PM
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Electricity is, by far, the most energy consuming form of changing the temperature. You'll need a HUGE alternator, or maybe a Honda portable generator in the front trunk, to make any real heat. Fact'o life .................... The Cap'n
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davep
post Jun 28 2008, 04:38 PM
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(IMG:style_emoticons/default/agree.gif)
Can't argue with that observation. I think a 200 amp alternator would be required.
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GeorgeRud
post Jun 28 2008, 04:54 PM
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I think that many have considered it, but nobody has really made a working system. It comes down to using heat exchangers or addind a gas fired heater using early VW or early Porsche 911 technology.

The old Eberspacher gas heaters did put out amazing amounts of heat, but I've only ever seen one photo of one in a 914. If anyone knows where that photo can be found, I think many of us would like to see it. I seem to remember someone had a web site with pictures of 914 accessories.
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r_towle
post Jun 28 2008, 05:05 PM
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QUOTE(GeorgeRud @ Jun 28 2008, 06:54 PM) *

I think that many have considered it, but nobody has really made a working system. It comes down to using heat exchangers or addind a gas fired heater using early VW or early Porsche 911 technology.

The old Eberspacher gas heaters did put out amazing amounts of heat, but I've only ever seen one photo of one in a 914. If anyone knows where that photo can be found, I think many of us would like to see it. I seem to remember someone had a web site with pictures of 914 accessories.

http://www.914world.com/bbs2/index.php?sho...;hl=Eberspacher
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Todd Enlund
post Jun 28 2008, 05:54 PM
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How about oil heat?
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HeloMech
post Jun 28 2008, 07:37 PM
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they have a little 12vt dc heater/blower thing at harbor freight for like $12. I just bought one for a guy at work who's heater blowers aren't working. He's been able to park next to his garage lately so he hasn't needed to try it. It's very small and we're hoping it will work for defroster. Just sits on the dash. Goofy looking little thing. Must be FAST though... it's yellow.

YHAF.

http://www.harborfreight.com/cpi/ctaf/disp...temnumber=96144

just saw this one online too.

http://www.harborfreight.com/cpi/ctaf/disp...temnumber=94592
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davep
post Jun 28 2008, 07:50 PM
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QUOTE(HeloMech @ Jun 28 2008, 05:37 PM) *

they have a little 12vt dc heater/blower thing at harbor freight for like $12.

The company I work for import those heaters. As technical manager, I have to test them. The phrase "totally useless" adequately describes them.

The only real solution is to get SSI heat exchangers and rebuild the factory system.
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904svo
post Jun 28 2008, 08:05 PM
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This is the design that I use for a heater in my 904.

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Rand
post Jun 28 2008, 08:39 PM
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QUOTE(davep @ Jun 28 2008, 06:50 PM) *

QUOTE(HeloMech @ Jun 28 2008, 05:37 PM) *

they have a little 12vt dc heater/blower thing at harbor freight for like $12.

The phrase "totally useless" adequately describes them.
The only real solution is to get SSI heat exchangers and rebuild the factory system.


Agree, those electric things are useless. The wire gets hot before it does anything to the windshield. Electric simply cannot produce enough heat to do any good off the regular wiring.

While I agree that heat exchangers are the best solution, there are a couple of other options. One is the gas Eberspächer as Rich mentioned. The other is more of a compromise, but works for some of us:

Golf cart heater. Can sit in a cupholder. Can be mounted to point at windshield. Portable catalytic infrared, runs off a gas bottle. Just beware - get one that is rated indoor safe! (Otherwise carbon monoxide poisoning is a risk.)
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bandjoey
post Jun 29 2008, 12:10 AM
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(IMG:style_emoticons/default/laugh.gif) You can always to the heat pump route. Home depot has them on the July 4 sale for $99.


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HeloMech
post Jun 29 2008, 02:13 PM
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Yeah, I just don't drive MY car when weather is that crappy. But he lives at the beach and even when the weather WILL be nice, he's got fogged windows in the morning on the way to work. He's getting nothing out of either blower and his wiper motor appears to be inop.

Thought it would be a shot in the dark for him to clear his windshield enough to get going down the street. I mean, really, come on.. it's got a flip out handle so he could dry his hair too.... (IMG:style_emoticons/default/wink.gif)

What if I chop the wires and solder in a larger guage... if he decides to use it at all... I mean, if he'd get the 944 and turbo 944s out of his garages, he'd be able to put the 914 in there and he wouldn't HAVE fogged windows in the morning!!!

man... I LOVE that generator/window AC idea... I wish I'd have thought of that while I had the PT Cruiser!!
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Tom
post Jun 29 2008, 02:48 PM
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Power requirements would be too great. Power in watts is Current (amps) X voltage. P=IE Say you have a 1200 watt heater - think hair dryer. Divide 1200 by volts (12) and you would need 100 amps. Not only large alternator, but some pretty large wire to supply the heater also.
SSHE's and a good blower!
Tom
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914Mike
post Jun 29 2008, 09:08 PM
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QUOTE(Tom @ Jun 29 2008, 01:48 PM) *

Power requirements would be too great. Power in watts is Current (amps) X voltage. P=IE Say you have a 1200 watt heater - think hair dryer. Divide 1200 by volts (12) and you would need 100 amps. Not only large alternator, but some pretty large wire to supply the heater also.
SSHE's and a good blower!
Tom

(IMG:style_emoticons/default/agree.gif)
Remember that the blower needs a check valve to prevent cooling air loss when its not running...

I, f you change the voltage to 120 you only need 10 Amps... The heaters in my electric conversion are "1500" Watt ceramic heater cores running on 144VDC, drawing 15 Amps for the pair. Serious heat! Mounted under the cowl next to the hood springs so losses through the longs are avoided, as well as the condensation in there.
If you are serious about electric heat, just get a huge deep cycle battery, (like a Caterpillar batt!) and an inverter that can handle one of those 1500 Watt heaters (Say 3KW continuous rating.) Recharge the battery at home so it does not need to be connected to your dinky alt, in summer time you can take the whole thing out and leave it home! You need to size the battery to provide power for the length of you trip of course. (IMG:style_emoticons/default/driving.gif)

P.S.
You can see pics on Roadglue of my heaters. (Alt Power forum.) Still working on it! (IMG:style_emoticons/default/welder.gif)
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Krieger
post Jun 29 2008, 09:41 PM
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How about adding the components for heated seats. (IMG:style_emoticons/default/confused24.gif)
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boxstr
post Jun 29 2008, 10:54 PM
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Hot seat at CAMP
CCLINHOTBUTT


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914fun
post Jun 30 2008, 11:46 AM
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QUOTE(904svo @ Jun 28 2008, 09:05 PM) *

This is the design that I use for a heater in my 904.

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Hey 904svo! I like this idea. Lots of other good ideas also. Thanks guys. Will likely try this one first. How did you come up with the Shroud over the oil cooler. It will not put off an oil smell, right? Then I just splice into the heat ducts, right? Where is the oil comming out of the motor. I have an oil cooler system the p.o. put in. There is about 11 Feet of oil line. The p.o. said he dose not trust it to pump the oil very good, so he unhooked it. What oil pump would you recomend to pump that far. I have not picked up the car yet so I have not looked at his systm but I bet its doable. Thanks for taking the tim to make the drawing.
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904svo
post Jun 30 2008, 02:23 PM
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Here are some pictures of my system, I used a spare 914 oil cooler and made two
shrouds for the air.


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904svo
post Jun 30 2008, 02:26 PM
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Here are the pictures of the oil return system.

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904svo
post Jun 30 2008, 02:28 PM
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The oil pump is a low pressure, low volume pump that can be bought at
Harbor Freight.
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