| [ Total Views: 1277 | Total Replies: 12 | Thread Id: 97355 ] |
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 hulbyw
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| posted on June 10th, 2012 at 06:14 PM |
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Opening Up Heater Boxes
Have just bought some heater boxes with the intention of opening up the seam to remove the pipe inside so I can then use stainless steel J pipes in
their place with a larger internal daimeter than the stock pipes.
Anyone done this successfully and if so what method did you use to open the heater box outer shell then reassemble it afterwards. The seams appear to
be just folded howeevr opening and closing them neatly seems a challenge
Cheers..................Wayne
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 vw54
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| posted on June 10th, 2012 at 06:22 PM |
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Yes i did this about 2 months ago to fit a Vintage Speed exhaust and muffler with large J pipes and make the heater work
you need the later type heater boxes with no alloy surronds on the tubes they open up much easier
use a oxy flame to heat he seam and open with a flat blade screw driver
when the tube is fitted they can be panel beated back into place 2 person job for sure
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Camo
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| posted on June 10th, 2012 at 10:09 PM |
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I am just to lazy, as I bought larger diameter heater boxes and fitted them 
Kev
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vw54
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| posted on June 11th, 2012 at 07:52 AM |
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| Quote: |
bought larger diameter heater boxes and fitted them
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what size are they Kev ??
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Camo
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| posted on June 11th, 2012 at 10:51 AM |
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| Quote: | Originally
posted by vw54
| Quote: |
bought larger diameter heater boxes and fitted them
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what size are they Kev ??
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From memory they are 1 5/8".
Kev
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68AutoBug
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| posted on June 11th, 2012 at 11:50 AM |
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they make heater boxes in 1 1/2 inch 38mm standard
1 5/8 42mm
1 3/4 45mm
1 7/8 48mm
not sure what sizes are sold in Australia..
If You are opening standard boxes make sure they are the later pipe only type and not the finned alloy types...
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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hulbyw
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| posted on June 11th, 2012 at 06:51 PM |
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Please enlighten me vw54 and 68Autobug. Why not use the finned alloy types?
Cheeers...........Wayne
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Joel
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| posted on June 11th, 2012 at 09:06 PM |
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I honestly don't think it would make any difference, I have a bunch of them sitting in the shed and the outer shell looks identical on both.
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 matberry
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| posted on June 11th, 2012 at 09:26 PM |
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I think the housing on the alloy ones has larger openings as the alloy sheath adds to the diameter of the exhaust pipe. Not really an issue as the
casing is normally needing repair in that area anyway and will probably need changing for the new pipe.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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vlad01
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| posted on June 14th, 2012 at 03:00 PM |
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inside the alloy ones, if you cut the actual pipe open too, isn't even a round pipe, its actually cast iron with fins on the inside then that has
alloy fins cast to the outside. I imagine this to be fairly restrictive compared to a round exhaust pipe.
71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE |
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Joel
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| posted on June 14th, 2012 at 03:27 PM |
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I thought that too till someone did a cross section comparison on the samba and calclated the pipe area of the two.
The wavey shaped ones have larger inside pipe surface area than stock 1 3/8" round ones but whether the shape of the walls makes them flow worse is
anyones guess till someone tests them.
I don't know if they are all like it, I;ve got some de-shelled 72 bug ones which was the last year of the finned ones in aus I feel like cutting
right open.
Edit...
Can't find the thread but heres the pics,
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hulbyw
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| posted on June 14th, 2012 at 05:17 PM |
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Thanks guys for all your input. Joel and vlad01, I had no idea that the inside of the pipe wasn't round. Seeing that section and all the effort that
VW put in to make them makes me wonder how well straight pipes will actually give off heat. It gets fairly cold in Melbourne. I may be better off
sacrificing a tiny bit of performance for the sake of a good heater and keep using the stock alloy ones
Cheers.....Wayne
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Joel
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| posted on June 14th, 2012 at 09:17 PM |
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The 73 and later heaterboxes are just J tubes with the heaterbox shell.
I still had them in a couple of my bugs, whilst they don't get as hot it;s not that noticable and I'd bet stainless steel generates a bit more heat
and quicker than the stock metal ones.
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