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mb911 |
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#1
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
Most of you know that I am in the process of building 1.625 primary heat exchangers for the 914-6 market.. Danny so kindly has lent me a pair of factory heat exchangers to use as a pattern.. The issue is that the heat exchangers when sitting flat as if they were mounted on and engine the exit flange is off of perpendicular square(word) by about 3/16" .. Both of them are.. So a better explanation would be if you are looking at that back of the car with the muffler off the muffler flange bolt holes do not look square across the back of the car..
We have been discussing this for a few weeks. It should be square imho and some ssis I just installed on a customer's car today do as well.. So the question is what is the general consensus? Either way is easy but square and level makes the most sense to me as all 911 mufflers are built that way.. |
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Steve |
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#2
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 5,614 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California ![]() ![]() |
(IMG:style_emoticons/default/thisthreadisworthlesswithoutpics.gif)
I have stock heat exchangers on my car now. I don't know what you are referring too. |
raynekat |
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#3
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,159 Joined: 30-December 14 From: Coeur d'Alene, Idaho Member No.: 18,263 Region Association: Pacific Northwest ![]() ![]() |
If you're talking about the flanges that mate up with the muffler inlets, I agree....level and square.
Put a straight across my muffler flanges and they are level and square. |
mb911 |
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#4
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
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mepstein |
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#5
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914-6 GT in waiting ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region ![]() ![]() |
I'm going to want to bolt on a m&k exhaust. So what ever is going to make that fit gets my vote.
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JmuRiz |
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#6
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 5,434 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region ![]() ![]() |
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Dave_Darling |
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#7
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914 Idiot ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California ![]() ![]() |
The exhaust flanges have to mate with the muffler flanges. So make them match up with the 911 muffler flanges. (The 914-6 muffler is hard to find, so chances are people will be using 911 mufflers.)
--DD |
mepstein |
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#8
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914-6 GT in waiting ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 19,316 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region ![]() ![]() |
NOS M&K (IMG:style_emoticons/default/biggrin.gif)
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mb911 |
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#9
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
Guys remember I am Mr m&k in a former life.. Just want to understand why the stock 914-6 exchangers are clocked off.
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fixer34 |
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#10
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,090 Joined: 16-September 14 From: Chicago area Member No.: 17,908 Region Association: Upper MidWest ![]() ![]() |
Most of you know that I am in the process of building 1.625 primary heat exchangers for the 914-6 market.. Danny so kindly has lent me a pair of factory heat exchangers to use as a pattern.. The issue is that the heat exchangers when sitting flat as if they were mounted on and engine the exit flange is off of perpendicular square(word) by about 3/16" .. Both of them are.. So a better explanation would be if you are looking at that back of the car with the muffler off the muffler flange bolt holes do not look square across the back of the car.. We have been discussing this for a few weeks. It should be square imho and some ssis I just installed on a customer's car today do as well.. So the question is what is the general consensus? Either way is easy but square and level makes the most sense to me as all 911 mufflers are built that way.. I think the key to your answer is 'as if they were mounted...'. If you are just laying the factory exchangers on a flat surface without actually bolting them to an engine, I don't think the orientation of the muffler flanges will be accurate. Find an engine to bolt them up to, or make a solid jig that matches the 2 sets of cylinder head ports exactly and fabricate from there. If I recall, that was the problems with the first sets of Dansk heat exchangers that came out. I'm almost certain that the muffler flanges/holes on my factory set line up horizontally. |
Luke M |
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#11
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,377 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States ![]() ![]() |
I think I know what you're asking here.... Now if you look at the 911 engine the cylinder heads do not align from side to side. They are off so that makes one header longer then the other... Is that what you're asking? I added a few pics so you can see what I'm talking about. Attached image(s) ![]() ![]() ![]() ![]() |
mb911 |
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#12
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
I have several engines to mount them to along with nice fixtures started.. I will make them the same as an ssi would be .. It will be correct.
I am specifically talking about flanges to head versus clocking of the exit flange.. They should be on the same plane but are not in the samples I have but that maybe because they are not new and could have warped over the years as they often do considering the way the muffler bracket design that would make the most sense as they get lazy on the outward hole on each exchanger. |
mb911 |
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#13
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
I think I know what you're asking here.... Now if you look at the 911 engine the cylinder heads do not align from side to side. They are off so that makes one header longer then the other... Is that what you're asking? I added a few pics so you can see what I'm talking about. No I am NOT talking offset of the cylinders but I can see how it would appear that way. |
mb911 |
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#14
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
I guess to clarify. Look at the picture of the engine in my shop and see how the straight edge lines up with all the bolt holes. This does not happen with the exchangers I have for a 914-6. Sample.. They are rotated.
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Luke M |
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#15
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,377 Joined: 8-February 05 From: WNY Member No.: 3,574 Region Association: North East States ![]() ![]() |
I guess to clarify. Look at the picture of the engine in my shop and see how the straight edge lines up with all the bolt holes. This does not happen with the exchangers I have for a 914-6. Sample.. They are rotated. Ok, I see what you're saying now. It could be one of your test headers is bent or repaired in the past ? I would need to mount my headers on the engine to see if things align. I can do that if you need another look at things. Let me know.. |
Steve |
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#16
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 5,614 Joined: 14-June 03 From: Orange County, CA Member No.: 822 Region Association: Southern California ![]() ![]() |
The flanges should be parallel like your picture, but also make sure they line up with the 914-6 trans muffler hanger.
Should be the same as a 911 muffler. |
mb911 |
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#17
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914 Guru ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest ![]() ![]() |
Ok that's what I assumed however that's not the story I was getting from my samples.
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