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Author Topic: modified j tube heat exchangers.  (Read 11653 times)
67worshipper
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« on: November 15, 2009, 11:49:02 am »

i know people have modified j tubes into heat exchangers.can anyone follow this up with pictures please.they obviously wont give as much heat as proper heat exchangers but will take the chill off an interior for extra usage in the colder months.thanks in advance Grin
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speedwell
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« Reply #1 on: November 15, 2009, 11:58:20 am »

nothing special , but here's the one on the berglar
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speedwell
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« Reply #2 on: November 15, 2009, 12:01:25 pm »

 Wink
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67worshipper
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« Reply #3 on: November 15, 2009, 12:39:19 pm »

cheers fabs.im presuming that they slice round the original heat exchanger and fit it to the merged j tube.the inerds of the heat exchanger wont fit though?
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Rocket Ron
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« Reply #4 on: November 15, 2009, 12:59:43 pm »

I'm sure someone does big bore heat exchangers with flange outlets but i cant remember were I saw them Embarrassed sorry
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67worshipper
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« Reply #5 on: November 15, 2009, 17:21:08 pm »

ssp do the flanged bigbore exchangers ron but only in an 1inch and 3/8s which i dont think is big enough for a 2276 motor size Huh
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nlvtinman
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« Reply #6 on: November 15, 2009, 17:23:58 pm »

Not that it would work as well as the system Fabs showed on the Bergler, but an adapted non fresh air 40hp heater system,  is another option. This was the type of heater system Keith Goss built for his '62 chop top.
Any photos of that Fabs?
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speedwell
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« Reply #7 on: November 15, 2009, 18:04:08 pm »

 Wink
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Torben Alstrup
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« Reply #8 on: November 15, 2009, 19:46:39 pm »

Unless you see a challenge in making them yourself, there is no need. CSP makes them in 1½, 1 5/8" , 1 3/4" and even 1 7/8".

T
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67worshipper
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« Reply #9 on: November 15, 2009, 20:07:44 pm »

thankyou torben.i didnt realize csp made all those Roll Eyes
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speedwell
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« Reply #10 on: November 15, 2009, 20:08:35 pm »

http://www.csp-shop.de/cgi-bin/cshop2/front/shop_main.cgi?func=anzeige&wkid=187342392567&rub1=Exhaust%20%2F%20Heating&rub2=Exhaust%20System%2DModified%2CJ%2DTubes%20%2F%20Heat%20Exchangers

http://www.csp-shop.de/cgi-bin/cshop2/front/shop_main.cgi?func=det&wkid=187342392567&rub1=Exhaust%20%2F%20Heating&rub2=Exhaust%20System%2DModified%2CJ%2DTubes%20%2F%20Heat%20Exchangers&artnr=14002b&pn=0&sort=0&all=

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67worshipper
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« Reply #11 on: November 15, 2009, 20:14:09 pm »

fabs your excelling yourself Grin thanks again.anybody using these and what sort of heat do they give?
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youngnstudly
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« Reply #12 on: November 16, 2009, 01:12:21 am »

Real men build heater boxes themselves! But if you must, go ahead and buy them.... Wink
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Rennsurfer
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« Reply #13 on: November 16, 2009, 01:18:48 am »

Had Tiger at A-1 Muffler make my 1 5/8" flanged heater boxes and work great!
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youngnstudly
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« Reply #14 on: November 16, 2009, 01:29:24 am »

Yeah, but that costs $$$$! Shocked Tiger does great work from what I've seen though. Did you order yours with the coating? My homemade ones didn't turn out totally perfect, but they should get the job done...I hope! Grin
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67worshipper
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« Reply #15 on: November 16, 2009, 14:30:39 pm »

Had Tiger at A-1 Muffler make my 1 5/8" flanged heater boxes and work great!
what size motors are fitted to your cars fred?
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Gunter
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« Reply #16 on: November 16, 2009, 16:12:10 pm »

fabs your excelling yourself Grin thanks again.anybody using these and what sort of heat do they give?

Hi thanks all for the comments
they give heat like original
BUT off course if you have the big diametre of 48mms
inside fins is less than original since outside of the heat exchanger remains same size
you can not change that
but our customers (mostly UK) are very satisfied with the heat AND combined with a big engine

Gunter
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Diederick/DVK
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« Reply #17 on: November 16, 2009, 16:22:42 pm »

perhaps it's a dumb question but don't these heater boxes



require certain alterations to the merged header, and a fresh air shroud?

edit, ok this type works with our headers i suppose, but still requires a "stock" shroud:



i would be more interested in the 40hp style like the chop top.
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speedwell
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« Reply #18 on: November 16, 2009, 17:18:50 pm »

perhaps it's a dumb question but don't these heater boxes



require certain alterations to the merged header, and a fresh air shroud?

edit, ok this type works with our headers i suppose, but still requires a "stock" shroud:



i would be more interested in the 40hp style like the chop top.
yes here's the berglar engine and had the stock shroud
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alfie the monster
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« Reply #19 on: November 17, 2009, 11:49:54 am »

Real men build heater boxes themselves! But if you must, go ahead and buy them.... Wink

Real men don't feel the cold  Wink
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JG54 Grunherz
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« Reply #20 on: November 17, 2009, 16:10:19 pm »

This is a system built for Billboa by Doug Berg.
Beautiful work, fits great and very detailed. I can't imagine it took less than several days to complete this ...
Full 1 3/4" merged with dual 2 1/2" muffs! Shocked Cool Wink Grin
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Brandon Sinclair
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« Reply #21 on: November 17, 2009, 17:41:40 pm »

That looks like a nice system-the down pipes on the heater boxes look like a nice addition and well at the extra material to support the dual mufflers.  I bet it works pretty well!
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youngnstudly
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« Reply #22 on: November 18, 2009, 08:00:07 am »

Real men build heater boxes themselves! But if you must, go ahead and buy them.... Wink

Real men don't feel the cold  Wink

I wish I was a real man!  Grin
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Doktor
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« Reply #23 on: November 18, 2009, 09:02:46 am »

I have an idea that could fit in this topic very nicely...

How about making a bigger j-tube from stainless stell, and then fit it in the body of original heat exchanger ?
Would that work ?
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dr.aircooled
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« Reply #24 on: November 18, 2009, 10:26:01 am »

I was impressed with these....











Ribs were used through out for heat transfer



Cheers,

J
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benssp
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« Reply #25 on: November 18, 2009, 12:00:35 pm »

do what i did, made a choice between a warm coat and heat exchangers...............the coat won Grin
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Rennsurfer
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« Reply #26 on: November 18, 2009, 14:51:21 pm »

Some really cool ideas and images on this thread. Good to see people fabricating to enjoy heat and high performance for their VWs.
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The Ideaman
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« Reply #27 on: November 18, 2009, 16:33:36 pm »

i know people have modified j tubes into heat exchangers.can anyone follow this up with pictures please.they obviously wont give as much heat as proper heat exchangers but will take the chill off an interior for extra usage in the colder months.thanks in advance Grin
Your car has had the tubes cut off the heater channels.  Just put a hot potato in your jacket pocket.
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Brandon Sinclair
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« Reply #28 on: November 18, 2009, 18:09:02 pm »

There are also heater muffs available for aircrafts that just clamp over your existing j tubes

http://www.aircraftspruce.com/catalog/eppages/homebuildersheatmuffs.php
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63 ripper
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« Reply #29 on: November 18, 2009, 18:14:33 pm »

i know people have modified j tubes into heat exchangers.can anyone follow this up with pictures please.they obviously wont give as much heat as proper heat exchangers but will take the chill off an interior for extra usage in the colder months.thanks in advance Grin
Your car has had the tubes cut off the heater channels.  Just put a hot potato in your jacket pocket.


 Cheesy Grin Cheesy
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JG54

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