 Why are 1975/1976 heat exchangers considered undesirable? |
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| 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 
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Just more convoluted than the earlier ones? Don’t flow as well?
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Replies(1 - 9)
| ConeDodger |
Nov 29 2019, 04:02 PM
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#2
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Apex killer! Group: Members Posts: 23,622 Joined: 31-December 04 From: Tahoe Area Member No.: 3,380 Region Association: Northern California
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Flow. Cat?
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| Maltese Falcon |
Nov 29 2019, 04:12 PM
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#3
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Advanced Member Group: Members Posts: 4,708 Joined: 14-September 04 From: Mulholland SoCal Member No.: 2,755 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. |
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| rhodyguy |
Nov 29 2019, 04:19 PM
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#4
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,098 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
And the fasteners rust up pretty solid. LOTS of piping out side of the casings. Less exhaust options.
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| Mark Henry |
Nov 29 2019, 04:24 PM
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#5
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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 |
QUOTE(Maltese Falcon @ Nov 29 2019, 05:12 PM)  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. |
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| porschetub |
Nov 29 2019, 10:40 PM
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#6
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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 |
QUOTE(Mark Henry @ Nov 30 2019, 11:24 AM) QUOTE(Maltese Falcon @ Nov 29 2019, 05:12 PM) 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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| Tdskip |
Nov 30 2019, 07:22 AM
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#7
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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Thanks all - very helpful discussion (as always)
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| Triaddave |
Nov 30 2019, 12:51 PM
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#8
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Member Group: Members Posts: 244 Joined: 31-December 03 From: olympia,wa Member No.: 1,478 |
I have a box full of 75/76 flanges, laser cut, they look great. Pipe is fairly cheap too. If you live somewhere you don't need heat.you can turn the header pipe around from side to side, make an extension to the stock location and just buy a exhaust for a 75/76 car.
If you want heat, swap out the cat for a extension as well,and buy the proper exhaust. Triad makes exhausts for any stock 914, 1.7/1.8, 2.0, 75/76 and for the 914/6. |
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| Tdskip |
Nov 30 2019, 05:46 PM
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#9
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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QUOTE(Triaddave @ Nov 30 2019, 01:51 PM) I have a box full of 75/76 flanges, laser cut, they look great. Pipe is fairly cheap too. If you live somewhere you don't need heat.you can turn the header pipe around from side to side, make an extension to the stock location and just buy a exhaust for a 75/76 car. If you want heat, swap out the cat for a extension as well,and buy the proper exhaust. Triad makes exhausts for any stock 914, 1.7/1.8, 2.0, 75/76 and for the 914/6. Sorry I missed this post @Triaddave . |
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| Tdskip |
Jun 8 2020, 02:23 PM
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#10
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None
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Thought this might be of interest to people who have an opened up a set of 1975/1976 he exchangers, here’s what they look like inside.
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