Common plenum or individual runners???, for gas milage and drivability |
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Common plenum or individual runners???, for gas milage and drivability |
Mueller |
Dec 16 2004, 10:04 PM
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#101
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
for my 2316 it seems that the stock plenum might be reaching it's limits as far as volume goes.....so, I either fabricate a larger common plenum, or go with individual throttle bodies such as TWM or Jenvey*
single plenum would be easiest, but the individual throttle bodies look better (IMG:style_emoticons/default/smile.gif) has anyone switched from one to the other on the same motor with everything else being the same??? *Jake Raby is the U.S. distributor of these.... |
Mueller |
Dec 19 2004, 12:21 PM
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#102
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
914efi, nice DIY job (IMG:style_emoticons/default/smilie_pokal.gif)
a couple of questions if you don't mind...location of throttle body, I don't see it.....do you have any sort of air-horns or radiused inlets inside the main plenum going to the runners? (if not, this could be an issue if the runners just mate directly to the flat sides of the plenum) Brett, I know the low speed drivability supposed to suck with slide-valves and barral valves, but it seems that using those with a plenum, some of the problems can be overcome. Dave, My MS install on the 1.8 w/2.0 heads and 2.0 plenum and a header pulled 55kPa at idle, I wonder if it was due to the more effeicient heads on the smaller bore motor ??? Now, what material would be best to build the plenum out of??? I'd have to say some sort of plastic or non-metal material so that heat soak does not happen as easily.....time to start hitting those websites to learn how to use and make something from carbon-fiber (IMG:style_emoticons/default/smash.gif) |