Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> Throttle body return spring, 1.8 L-Jet setup
MrKona
post Apr 20 2014, 10:51 PM
Post #1


Senior Member
***

Group: Members
Posts: 597
Joined: 25-July 05
From: Santa Rosa, CA
Member No.: 4,469
Region Association: None
Used to read the 914 parts diagram catalog like a novel and thought I had it all figured out. But after seeing an old picture in the Classifieds today of an L-jet throttle body with a spring, I realized I don't have this spring.

Porsche calls it the Return Spring 022 129 881 F.

Can someone with a 1.8 L-Jet please post a picture of where this spring connects. I can see where it connects on the TB, but what about the other end? On the plenum, or body sheet metal somewhere?

Thanks,
Bryan
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 21 2014, 08:29 AM
Post #2


914 Idiot
**********

Group: Members
Posts: 14,986
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
On my old 1.8, it connected to a hole in the rear (vertical) engine tin. I don't know if that was stock or not, though.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type47
post Apr 21 2014, 09:29 AM
Post #3


Viermeister
****

Group: Members
Posts: 4,254
Joined: 7-August 03
From: Vienna, VA
Member No.: 994
Region Association: MidAtlantic Region
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
smarens
post Apr 21 2014, 09:48 AM
Post #4


Member
**

Group: Members
Posts: 69
Joined: 15-March 14
From: Michigan
Member No.: 17,121
Region Association: None
I have a 1975 1.8, didn't drive it today, will take picture tonight for you
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 21 2014, 10:18 AM
Post #5


914 Idiot
**********

Group: Members
Posts: 14,986
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
The pic that Type47 shows is the way I remember mine being.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
tomeric914
post Apr 21 2014, 10:24 AM
Post #6


One Lap of America in a 914!
***

Group: Members
Posts: 1,259
Joined: 25-May 08
From: Syracuse, NY
Member No.: 9,101
Region Association: North East States
What is the actual purpose of the long spring? It seems like it prevents the throttle from closing too quickly. The actual return spring is wrapped around the TB shaft.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MrKona
post Apr 21 2014, 11:59 AM
Post #7


Senior Member
***

Group: Members
Posts: 597
Joined: 25-July 05
From: Santa Rosa, CA
Member No.: 4,469
Region Association: None
QUOTE(type47 @ Apr 21 2014, 08:29 AM) *

Attached Image


Wow - Thank you! I never would have found that.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
MrKona
post Apr 21 2014, 12:01 PM
Post #8


Senior Member
***

Group: Members
Posts: 597
Joined: 25-July 05
From: Santa Rosa, CA
Member No.: 4,469
Region Association: None
QUOTE(tomeric914 @ Apr 21 2014, 09:24 AM) *

What is the actual purpose of the long spring? It seems like it prevents the throttle from closing too quickly. The actual return spring is wrapped around the TB shaft.


I was wondering that as well.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ndfrigi
post Apr 21 2014, 01:29 PM
Post #9


Advanced Member
****

Group: Members
Posts: 2,928
Joined: 21-August 11
From: Orange County
Member No.: 13,474
Region Association: Southern California
Mine is 75 1.8L F.I. and since I acquired this teen last 2011 it does not have that extra spring. The return coiled spring is doing his job already. I tried before installing a long return spring but it just hardened my accelerator pedal.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type47
post Apr 21 2014, 02:20 PM
Post #10


Viermeister
****

Group: Members
Posts: 4,254
Joined: 7-August 03
From: Vienna, VA
Member No.: 994
Region Association: MidAtlantic Region
QUOTE(tomeric914 @ Apr 21 2014, 08:24 AM) *

What is the actual purpose of the long spring? It seems like it prevents the throttle from closing too quickly.


probably makes it harder to push the gas pedal to prevent you from/make it a little harder to unleash all that HP (IMG:style_emoticons/default/rolleyes.gif) factory speed limiter?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
smarens
post Apr 21 2014, 03:36 PM
Post #11


Member
**

Group: Members
Posts: 69
Joined: 15-March 14
From: Michigan
Member No.: 17,121
Region Association: None
here is my '75 with 1.8, this is the way I got it, can't tell you for sure if this is correct/factory, 63k miles on it; good luck, please post what you find out


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Apr 21 2014, 04:29 PM
Post #12


914 Idiot
**********

Group: Members
Posts: 14,986
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
QUOTE(tomeric914 @ Apr 21 2014, 09:24 AM) *

What is the actual purpose of the long spring? It seems like it prevents the throttle from closing too quickly. The actual return spring is wrapped around the TB shaft.


It's like the spring on the 2.0 throttle body--at least, all but the early 73s. The long coil spring is the primary return spring; the one coiled around the throttle shaft is the "supplemental return spring", and is intended to let the throttle close if the primary spring breaks.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jim_hoyland
post Jan 29 2017, 03:59 PM
Post #13


Get that VIN ?
*****

Group: Members
Posts: 9,296
Joined: 1-May 03
From: Sunset Beach, CA
Member No.: 643
Region Association: Southern California
Found this thread while reattaching the return spring on my L-Jet; After looking at the picture I see mine had been on backwards; the outer end had been attached to the plenum instead of the rear tin.

When I connect the spring to the rear tin, it pulls the arm of the throttle body back Toward the rear. So, does this add tension to the main TB spring and make the accelerator pedal harder to push ?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jan 29 2017, 04:11 PM
Post #14


Advanced Member
****

Group: Members
Posts: 2,745
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
I believe it is a safety thing. So if the big spring breaks the little one will close the TB.

I remember reading a post where someone actually did have the big spring break. He might be the only one alive (that did not die), (IMG:style_emoticons/default/blink.gif) (IMG:style_emoticons/default/blink.gif) from not using the little spring.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Shivers
post Jun 21 2023, 09:06 AM
Post #15


Senior Member
****

Group: Members
Posts: 2,373
Joined: 19-October 20
From: La Quinta, CA
Member No.: 24,781
Region Association: Southern California
Attached Image


1972 1.7 tins. The hole was there from the FI days.
I’ve seen other cars using this hole. Hard to see,
the seal usually hides it.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 16th May 2024 - 01:03 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
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 ...