1974 1.8L FI Vacuum hoses? |
|
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. |
|
1974 1.8L FI Vacuum hoses? |
JeffBowlsby |
Dec 10 2010, 10:21 AM
Post
#1
|
914 Wiring Harnesses Group: Members Posts: 8,520 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None |
Which of these two diagrams is correct...the top or bottom one?
The difference is the hoses at the dizzy vacuum can...they cannot both be right. [NOTE: I deleted the incorrect diagram originally posted...the diagram remaining is the correct configuration] Attached image(s) |
Dave_Darling |
Dec 22 2010, 02:11 AM
Post
#2
|
914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Check the position of the vacuum fittings on the throttle body. The retard fitting would be "downstream" of the closed position of the throttle body. The advance fitting would be just barely "upstream" of the closed position of the throttle body.
The advance fitting on the distributor is the one that points away from the distributor body; the retard fitting is the one that points back toward the distributor body. Hook up the advance fitting on the TB to the advance fitting on the distributor, and the retard fitting on the TB to the retard fitting on the distributor. If your TB is missing one of those fittings, leave the corresponding fitting on the distributor open to the air. Or do what the factory did, which is hook up a short piece of hose and run it to nowhere. --DD |
pete000 |
Dec 22 2010, 12:42 PM
Post
#3
|
Senior Member Group: Members Posts: 1,885 Joined: 23-August 10 From: Bradenton Florida Member No.: 12,094 Region Association: South East States |
Check the position of the vacuum fittings on the throttle body. The retard fitting would be "downstream" of the closed position of the throttle body. The advance fitting would be just barely "upstream" of the closed position of the throttle body. The advance fitting on the distributor is the one that points away from the distributor body; the retard fitting is the one that points back toward the distributor body. Hook up the advance fitting on the TB to the advance fitting on the distributor, and the retard fitting on the TB to the retard fitting on the distributor. If your TB is missing one of those fittings, leave the corresponding fitting on the distributor open to the air. Or do what the factory did, which is hook up a short piece of hose and run it to nowhere. --DD Ok let me get this right, if the car came with only one fitting to the TB that would make it the retard fitting. Then the advance fitting on the distributer would then get vented to the air with a short peice of tubing. (No vacuum advance on these cars!) That would make my diagram correct. (IMG:style_emoticons/default/cheer.gif) Attached image(s) |
zonedoubt |
Dec 22 2010, 02:25 PM
Post
#4
|
Canadian Member Group: Members Posts: 668 Joined: 14-May 03 From: Vancouver, BC Member No.: 696 Region Association: Canada |
Ok let me get this right, if the car came with only one fitting to the TB that would make it the retard fitting. Then the advance fitting on the distributer would then get vented to the air with a short peice of tubing. (No vacuum advance on these cars!) That would make my diagram correct. (IMG:style_emoticons/default/cheer.gif) I think this could only be proven by looking at the position of single vacuum nipple on the TB (i.e. upstream or downstream of the throttle disc). I kinda think the rear facing nipple is for the advance on the 1.8L. That's how I have mine set up and it runs like poo if I switch it to the retard port on the dizzy diaphragm. So mine basically follows the PP diagram: http://www.pelicanparts.com/914/technical_...4_18FI_diag.htm I think there is some confusion with the other FI types. If you look at the 2.0L D-jet diagram http://www.pelicanparts.com/914/technical_...4_20FI_diag.htm, the rear-facing vac port on the TB is the retard. |
Lo-Fi Version | Time is now: 28th May 2024 - 12:17 PM |
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 ... |