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 Camo
A.k.a.: Kev
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| posted on July 31st, 2010 at 10:19 PM |
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Steve,
I think I might have found a simple solution and ones I haven't seen before.
Try this site : http://www.sportsimportsltd.com/12voltheaters.html?gclid=CJf7jcrclaMCFRe5bwodvgdWpQ
Kev
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1303Steve
A.k.a.: Steve Carter
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| posted on August 2nd, 2010 at 08:17 PM |
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Hi
Kev I think that they would draw too much power.
OK the good news is the fan & pump work fine, the bad news is that the heat exchanger doesn't get hot..........at all.
I'm not giving up on the idea yet, I will keep you posted.
Steve
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Aussie Dubbin
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| posted on August 2nd, 2010 at 08:33 PM |
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Is the heat exchanger unit too big??? Just an idea but if the volume was smaller maybe it would heat up more quickly.
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1303Steve
A.k.a.: Steve Carter
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| posted on August 2nd, 2010 at 08:56 PM |
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Hi
It maybe to big, but a couple of things that I will try is, I used some old Kevlar gloves to stop the clamps from wearing on the ceramic coating, so
this may be stopping some heat getting through.
The other thing I will try is wrapping the heat exchanger in exhaust wrap.
Steve
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vlad01
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| posted on August 2nd, 2010 at 09:24 PM |
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you can get another set of j pipes and build them into heat exchangers. Another way you can get the current ones to transfer heat is TIM (thermal
interface material)
some sort of high temp ceramic or silica compound or adhesive squished between. I know! try some muffler putty  is silica based. Traditional TIM is heat sink compound but there is far to much heat for any
electronic/computer thermal paste to work without melting off.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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donn
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| posted on August 2nd, 2010 at 10:41 PM |
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Sounds like you need to have the core (the pipe carrying the water) wraped tighter to the exhaust and then fully enclose it, I have seen this method
used in heat exchangers used on 4x4s for hot showers, the one I saw had the water so hot they had to have a cold water inlet to mix it to a cooler
temp.
I dream of a day when a chicken can cross a road without being asked for it's motive!
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1303Steve
A.k.a.: Steve Carter
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| posted on August 3rd, 2010 at 07:40 AM |
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Hi Donn
I thought the 4WD showers used coolant heat to transfer heat to warm the shower water.
So you're seen them wrapped around an exhaust?
Steve
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donn
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| posted on August 3rd, 2010 at 08:21 AM |
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Yeah, my son had one that a mate of his made up (made a few so they all didn't have to shower together  ) that was way back b4 they all got rich and bought the shop made ones that you mentioned.
I dream of a day when a chicken can cross a road without being asked for it's motive!
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Gracey
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| posted on August 3rd, 2010 at 10:05 PM |
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You could try coiling 1/2" copper pipe around the J pipes, them wrapping that with thermo tec insulation.
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 Peter Leonard
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| posted on August 3rd, 2010 at 10:29 PM |
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Nice idea. I find ashing my cigarette into the shag pile seat cover behind me works well, albeit destructively.
let sleeping dubs lie
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Newt
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| posted on August 3rd, 2010 at 11:17 PM |
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Hi Guys,
Love the concept, but wonder if in these less than standard applications, if it wouldnt be a simple way to go by using the pre fresh air heating
system that was used by VW for 20 odd years.
Newt
It is as it is - If you didnt enjoy today, you've missed the opportunity.
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1303Steve
A.k.a.: Steve Carter
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| posted on August 4th, 2010 at 08:14 AM |
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Hi
The early heating system was always plagued with smells and sometimes stuff that didn't smell but it would kill you.
I put some muffler putty between the J pipe and heat exchanger to make a tighter seal between them as there is a bump in the pipe where it fits up
now. I'm going out to get some exhaust wrap to cover the unit.
Steve
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HappyDaze
A.k.a.: Greg Mackie
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| posted on August 4th, 2010 at 12:27 PM |
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Hey Steve, if you wait a couple more months things will have warmed up, and a heater won't be necessary.
By next winter - you never know - 'Global Warming' may be starting to kick in. 
Cheers, Greg
I'd rather wear a Beetle out by racing it than by polishing it!
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1303Steve
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| posted on August 4th, 2010 at 12:38 PM |
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Hi Greg
Yes its nearly warm weather again, the car haters in government & RTA may have confiscated the car by then.
Just looking at the amount of money that was spent on keeping old cars on the road last weekend, if this industry is lost it will mean a lot of money
taken out of the economy.
It wasn't as bad as I thought it would be driving up to Vall with no heaters, the only problem was the back windows were fogged up all the time.
Steve
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funbug
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| posted on August 4th, 2010 at 04:33 PM |
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Try welding fins to the J-tubes to increase the surface area which would aid heat transfer
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donn
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| posted on August 4th, 2010 at 04:45 PM |
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| Quote: | Originally
posted by Gracey
You could try coiling 1/2" copper pipe around the J pipes, them wrapping that with thermo tec insulation. [/quote
Yeah, that's the idea but they had the copper enclosed inside a metal canister fitted around the exhaust pipe, only pumped water through it when they
wanted to use it out bush for a shower, made the ladies happier to tag along so the boys got to go away more often  , pumped water through the system with a bilge pump placed in a creek or large water container.
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I dream of a day when a chicken can cross a road without being asked for it's motive!
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71-BEETLE-SEDAN
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| posted on August 4th, 2010 at 05:08 PM |
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As for the back window go to dick smith and but two little fans, and point em at the window, works well just need something to mount them too aye.
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1303Steve
A.k.a.: Steve Carter
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| posted on August 4th, 2010 at 07:51 PM |
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Hi Josh
I have a factory heated rear screen that is yet to be fitted, I will try a few different things with the heat exchanger I have first.
Thanks for all the suggestions.
Steve
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dangerous
A.k.a.: Dave Butler Muffin Man
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| posted on August 5th, 2010 at 08:33 AM |
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this may be an option with some tubes, and original flapper valve under the seats.
http://www.cbperformance.com/catalog.asp?ProductID=1523
| Quote: | Originally
posted by westi
That's mad Alan.
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1303Steve
A.k.a.: Steve Carter
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| posted on August 5th, 2010 at 08:44 AM |
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Hi Dave
So that would take the heat directly from the dog house cooler that would normally be blown onto the road, good idea.
Steve
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Aussie Dubbin
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| posted on August 5th, 2010 at 09:09 AM |
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OOOOOOOHHHHHHH That looks fantastic... I like that idea
I was pondering last night and want to suggest some more investigation into the copper pipe idea. If you tightly wound the copper tubing around the
J-pipe and then wrapped exhaust wrap around the whole thing to make it an insulated body, or even made a larger steel enclosure that bolts together
around the exterior so that the heat is confined and has to circulate aroud the pipes.
Alternatively why not just leave the heat exchanger in place and the car on and run the coolant from a large bucket fo coolant and run into the heat
exchanger and out back into the bucket and you could test the heat out the pipe coming out????
You're doing a great job there is a lot of interest in the topic. Keep it up.
Cheers
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Aussie Dubbin
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| posted on August 17th, 2010 at 02:21 PM |
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Has everyone gone"cold" on this idea???
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1303Steve
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| posted on August 17th, 2010 at 05:53 PM |
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Hi
Its nearly warm enough now not to need heaters.
I'm going to look into getting some copper tube wound in a spiral to wrap around the J pipe, failing that I might try some straight 3/4 copper tube
fitted tightly to the J pipe.
Steve
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 barls
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| posted on August 17th, 2010 at 06:27 PM |
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steve, i think the copper pipe idea will work quite well as its exactly the opposite of the chillers used in making home brew beer to cool the wort
after the boil before fermentation.
ive heard of going from boiling to 30 degrees in about 15 minute using tap temp water.
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grogy
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| posted on August 17th, 2010 at 06:29 PM |
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how bout run hoses from the pickups under the car to a collector box wit xternal oil cooler inside and put reversible fan in car at each pipe under
back seat, if its hot have fan runnin taking air from inside car out thru oil cooler. if its cold have fans sucking air from outside thru cooler into
the car.
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1303Steve
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| posted on August 17th, 2010 at 07:17 PM |
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Hi
Grogy, there is not enough heat in the oil, I did a couple of 25 k runs today mostly on a freeway, the oil temp was only around 60 C.
Barls, is was talking too a work colleague at Valla about this issue, he has friend that has a copper pipe around an exhaust pipe midway down the car
and gets nice warm water out of it for his hand wash, sometimes too warm.
I think maybe my stainless heat exchanger held too much coolant.
Steve
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barls
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| posted on August 17th, 2010 at 07:32 PM |
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your problem most likely was the stainless part, it has terrible heat conductivity compared to almost everything else.
give the copper pipe a go.
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1303Steve
A.k.a.: Steve Carter
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| posted on August 17th, 2010 at 07:42 PM |
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Hi
I had visions of creating a potential bomb, stainless was bad a choice.
Steve
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Aussie Dubbin
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| posted on August 17th, 2010 at 09:27 PM |
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Steve,
Your box was awesome, well made, how about a smaller steel version that very simply blows air out of the original fan housing through the box an into
the tunnels... i'm pretty confident the air would heat up enough to warm the car...
thoughts?
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1303Steve
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| posted on August 17th, 2010 at 09:36 PM |
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Hi
Thats an idea but it could get a bit fumy.
Steve
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