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Re: Spiral HE's?

<x-flowed>I understand that spiraled fins would produce more surface area, however, it would add more material to the already heavy HE. It would also create more resistance to the air flow. Appropriate tooling would likely be more spendy and/or complex for a vehicle that is supposed to be more affordable than most. I'm not an automotive engineer so I could be way off, I'll admit, but it seems like too much work...ESPECIALLY if it was an after-market item.

David, are you sure that the fins simply aren't bent? How far into the exchanger can you see the spiral (sorry but the pictures don't show me anything)? Are there any indications that the HE was opened up and modified i.e. it's a one-off, custom item? I think you need to hang that carcass and gut it :-) Such a discovery is very interesting and we're all curious so we just want to know more, that's all. Imagine what THAT would go for on eBay LOL!

   Toby Erkson  --  air_cooled_nut@pobox.com
   '72 VW Squareback, '95 VW Jetta, '81 Gold Wing, '73 Porsche 914
   Portland, Oregon

Constantino Tobio wrote:

Hmm. I would imagine that the logic behind spiraling the heat sinks is
that it makes the effective distance that the air passing over there
longer, thus heating up the air more because it's traveling over the
HE for a longer time...

It's not a bad idea, actually. I'm surprised VW didn't do that all the
time. I don't see an obvious disadvantage. Maybe cooling the exhaust
too much on leaving the engine is bad? I don't know.

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