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German heat exchangers... how to tell?
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bhartwell59
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PostPosted: Sun Dec 04, 2016 8:47 am    Post subject: German heat exchangers... how to tell? Reply with quote

Ideally, without prying the boxes open.

Thnx!
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60ragtop
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PostPosted: Sun Dec 04, 2016 9:28 am    Post subject: Re: German heat exchangers... how to tell? Reply with quote

weight and how the outer skin is around the rear exhaust tube
original -see flange in lower red square
http://www.thesamba.com/vw/forum/album_page.php?pic_id=1422658
aftermarket
http://www.socalautoparts.com/product_info.php/ind...ay-p-16156
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Eric&Barb
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PostPosted: Wed Dec 07, 2016 7:44 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

Guessing this is for a late model VW with 60 mm outlet HEs. You can peer up the exhaust pipe rear end with a flashlight and just see the ribs inside the pipe. Helps to be in a dark room or night to see though.
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Mellow Yellow 74
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PostPosted: Wed Dec 07, 2016 8:52 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

Eric&Barb wrote:
You can peer up the exhaust pipe rear end with a flashlight and just see the ribs inside the pipe. Helps to be in a dark room or night to see though.


Yep, the original ones have fins on the heat exchangers that go across a lot of the area of the box whereas the reproduction ones have small fins that give a lot less heat transfer.

See diagram in this thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=347582
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Eric&Barb
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PostPosted: Wed Dec 07, 2016 9:08 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

Mellow Yellow 74 wrote:

Yep, the original ones have fins on the heat exchangers that go across a lot of the area of the box whereas the reproduction ones have small fins that give a lot less heat transfer.

See diagram in this thread: http://www.thesamba.com/vw/forum/viewtopic.php?t=347582


Yes, but we were referring to the ribs inside the pipes not ones the outside. See above link which shows just a round inside pipe used in the repros. Round = less surface area to extract the heat out of the exhaust and less cooling for the engine.
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Mellow Yellow 74
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PostPosted: Wed Dec 07, 2016 10:01 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

Whatever, same difference
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swavananda
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PostPosted: Wed Dec 07, 2016 10:01 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

I'm not sure all Original German years have this. But only OG Germans ones do. That is ,The aluminum Heat sink casting protrudes a bit from the outer skin, Seen by the exhaust port .Like this.

Image may have been reduced in size. Click image to view fullscreen.



Original VW Mexico and Brazil may be different from VW Germany.
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Eric&Barb
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PostPosted: Wed Dec 07, 2016 10:09 pm    Post subject: Re: German heat exchangers... how to tell? Reply with quote

Mellow Yellow 74 wrote:
Whatever, same difference


Sorta, sorta not. The 50 mm outlet OG ones for 40 HP almost always have a round inside of the pipe. Those do not heat as well as the later ribbed inside and do not cool the engine as well in warm weather.
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