Why are 1975/1976 heat exchangers considered undesirable? |
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Why are 1975/1976 heat exchangers considered undesirable? |
Tdskip |
Nov 29 2019, 03:58 PM
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#1
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Just more convoluted than the earlier ones? Don’t flow as well?
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Mark Henry |
Nov 29 2019, 04:24 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Probably the short primary tube design (like a manifold log design), with a long secondary (each bank) leading directly into a restrictive muffler/egr dump/ + cat. Everything the EPA/CARB needed in a '75-'76 914 to run hot and compliant (IMG:style_emoticons/default/evilgrin.gif) Nothing in this design bringing performance to the table. (IMG:style_emoticons/default/agree.gif) The early 2.0 HE's are not headers but at least they're two pipes that go straight back. Headers are the only true bolt on HP, although the increase isn't that big on a stock engine, on performance engine the difference using a good header is huge. |
porschetub |
Nov 29 2019, 10:40 PM
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#3
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Advanced Member Group: Members Posts: 4,707 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Probably the short primary tube design (like a manifold log design), with a long secondary (each bank) leading directly into a restrictive muffler/egr dump/ + cat. Everything the EPA/CARB needed in a '75-'76 914 to run hot and compliant (IMG:style_emoticons/default/evilgrin.gif) Nothing in this design bringing performance to the table. (IMG:style_emoticons/default/agree.gif) The early 2.0 HE's are not headers but at least they're two pipes that go straight back. Headers are the only true bolt on HP, although the increase isn't that big on a stock engine, on performance engine the difference using a good header is huge. (IMG:style_emoticons/default/agree.gif) a cheap solution would be to buy set of steel heatexhangers with bad or no tin ,not worth much,then bolt on stock or aftermarket muffler. Those pipes are not efficient and it will cost you $$$ to get 3 bolt flanges made,good luck. |
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