'75 1.8L Idling at 1,600 RPM -, Vacuum advance on distributor connected and... |
|
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. |
|
'75 1.8L Idling at 1,600 RPM -, Vacuum advance on distributor connected and... |
Rick986 |
Sep 17 2021, 04:35 PM
Post
#1
|
0-60 in 14 seconds! Group: Members Posts: 141 Joined: 31-August 21 From: NE Ohio Member No.: 25,869 Region Association: Upper MidWest |
Had the car in for a post PI today and tech noted that the "vacuum advance" on distributor was not connected when the (previously bad) charcoal canister was removed. He teed into another vacuum line and connected the vacuum port. He noted that this will increase RPM's but will also help with acceleration.
I did notice a slight increase in acceleration but more so, the car is now idling at 1,600 RPM when warm. Seems excessive. Plus, I think that I noticed that the exhaust no longer "pops" when decelerating (which was kinda cool...yet slightly obnoxious). Thoughts? Thanks for educating this Newbie... |
emerygt350 |
Sep 29 2021, 06:32 AM
Post
#2
|
Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
It's in idea. I suspect the springs are primarily there to center the advance arm, although overshoot is possible I suspect even idle engine vacuum probably pegs the retard (on the bench it doesn't take much to peg it). The decel valve also works with that rev down stuff.
My car does undershoot idle by a couple hundred rpm and then rise again but I don't mind since I find a hung idle to be super annoying. Not sure why. I would rather go low and come up then hang high and slowly come down. You could probably see that overshoot on a timing light. |
Lo-Fi Version | Time is now: 1st June 2024 - 09:46 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 ... |