Staring down the EFI rabbit hole again, /6 intake design, Which way around for the 964 plenums in a 914? |
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Staring down the EFI rabbit hole again, /6 intake design, Which way around for the 964 plenums in a 914? |
Mark Henry |
Feb 17 2021, 10:34 AM
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#1
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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 |
One of the locals fell on some hard times, his plans changed and his 930 was sold, so he offered me a smoking deal on an EFI system.
SDS EM5-F /6 system with twin plug coil packs, Siemens 55lb injectors, cold start valve, crank trigger and /6 trigger mount, extra relay outputs (had meth injection), Beru plug wires X2, manuals, base maps, dizzy hole block off, Bosch one wire (Djet) head temp sender plus all the cabling, fuses, etc that are not included with an SDS system. I already have a Wabro 300hp FI pump, a Djet fuel pressure regulator, 14point7 wideband O2 meter and an O2 bung in both headers. This is not a discussion on which Aftermarket EFI system is better, etc but rather on plenum based intake design. I'm not new. I've been playing with a SDS EM4-F /4 system since 2003-2004 that's now on my '67 bug T4 2600cc conversion, I know that ITB's are better for peak HP, but I'm after overall improvement, usable vacuum signal for MAP, drivability, fuel economy and etc. FYI I have also asked this on the bird board here for some more info on the build. This thread shows my /6 conversion a few years back and has all the engine specs here. Plus I've built my own motorcycle ITB's before here. Please I only want to discuss a single TB plenum based intake for performance EFI. |
targa72e |
Feb 17 2021, 02:50 PM
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#2
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Member Group: Members Posts: 262 Joined: 11-September 16 From: colorado Member No.: 20,392 Region Association: None |
HI Mark,
I also thought of using the later watercooled Porsche intakes on earlier car as a inexpensive intake. I went as far as to mock it up and it looks doable. You are correct that the later intake is too wide. However it looked like the center tubed could be cut down easily to make the intake narrower. They are connected to each side by rubber tube and clamps so should be easy. you would need to make a adapter to connect the oval tubes of the manifolds to the the round inlet on air cooled head. The intake I have (2.7 boxster I think) has a resonance tube and injector mounts so only would need adapter. I have not taken this any further as I had my friends 2.7RS spec motor with Mod S cams and webers in my 914 for a while and now I am hooked on top end rush of hotter cam. I decided the milder cams for single throttle intake would not cut it and will go ITB. Still might try and use intake over ITB's we will see. john |
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