Replacing 2.0 Plenum, Drop or No Drop Engine |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
Replacing 2.0 Plenum, Drop or No Drop Engine |
BeatNavy |
Nov 20 2021, 01:44 PM
Post
#1
|
Certified Professional Scapegoat Group: Members Posts: 2,933 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
I want to swap my current 2.0 late plenum with an early 2.0 plenum and the larger diameter inlets (trying to get more air to my Raby cam on cold start). I'm sure it's possible to do this in the car, but how big of a PITA is it? I can't recall off the top of my head if you need to remove or loosen the L/R cylinder tin in order to get the plenum off.
I know I'll have to loosen up the intake runners, and negotiating the old one off of those and the new one back on is sometimes finicky, even with the engine out. I'm pretty decent dropping the engine, but what's the quickest way here (or, the path of least resistance (IMG:style_emoticons/default/smile.gif) )? |
BeatNavy |
Nov 21 2021, 11:57 AM
Post
#2
|
Certified Professional Scapegoat Group: Members Posts: 2,933 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
Ok, got the plenum swapped and I think it's a winner. Potentially. The car started strong dead cold and idle immediately went to 1200 or 1300. I do need to make sure I don't have any other vacuum leaks I created when I did this (I reused the TB gasket and MAP sensor gasket -- I know, terrible!). I had tried everything I could think of to get a solid cold start including manipulating mixture, cold advance timing, and of course IAC settings. EDIT, I even drilled a small hole in the throttle body plate to allow more air to bleed through (as per Jake's recommendation on another thread relevant to the 9950 cam).
Now I need to completely go over my idle tune though. Except for cold starts, the other IAC and tune were working well, and I had closed loop doing it's job. Now I need to completely redo that (IMG:style_emoticons/default/smile.gif) Swapping the plenum with the engine in car wasn't too bad. Funny, the parts I thought would be hard, like getting the intake runners on and off, was pretty straightforward. I think I spent most of my time trying to get the darn tin screws back in. |
Lo-Fi Version | Time is now: 27th September 2024 - 11:34 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |