Header sizing 914-6 |
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Header sizing 914-6 |
mb911 |
Dec 27 2015, 02:21 PM
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#1
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
So while my 914-6 oil tanks are being machined I going to start working through my header with heat exhanger design out of stainless.. I do not have non compete on these with m&k so that gives me design freedom.. However I will use similar design process as the m&k/ rarlyl8 design. So my question is 1.5" the most common size or allot of you using 1.625
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jmill |
Dec 28 2015, 05:57 PM
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#2
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
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mb911 |
Dec 28 2015, 06:25 PM
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#3
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914 Guru Group: Members Posts: 6,851 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
Is there an accepted ratio between exhaust port size, and header pipe size? I'm no engineer but I'd think cylinder volume & RPM would be more relevant. Yes and yes so camshaft could dictate allot. Ssi use to only make one size primary but changed flanges based off engine requirement. I always saw great performance out of 1.5" primary 1.375 id on 2.0-3.0 on 3.2s you have to go 1.625.. I personally liked the 993 heat exchanger the best for this application.. In fact that would be a good fit for 914-6 but useing the Gillette style not bischoff like I preferred for the 911 setup because of flange location and adaption. Though the 993 heat exchanger is not equal length they are 1.625 and are very close to equal length.. I will probably go with 1.625 as my base but I worry about loss of low end torque on the smaller engines |
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