 Low compression with Carbs on and full throttle. |
|
|
|
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. |
|
|
  |
| slapshot |
 Jul 21 2023, 10:55 AM
Post
#1
|
|
Member  Group: Members Posts: 144 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains 
 |
I have a 1975 914 2.0 with Weber Dual 40 DNCF 12. When I do a compression test with the carbs, filters off and full throttle I only get 65 PSI. If I remove the carbs I get 102. I know 102 is still low but what could be wrong with my carbs limiting airflow? I've only had the car for about 7 months and stilling learning.
|
   |
 
|
| 930cabman |
Jul 21 2023, 11:33 AM
Post
#2
|
|
Advanced Member Group: Members Posts: 4,069 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States
|
QUOTE(slapshot @ Jul 21 2023, 10:55 AM)  I have a 1975 914 2.0 with Weber Dual 40 DNCF 12. When I do a compression test with the carbs, filters off and full throttle I only get 65 PSI. If I remove the carbs I get 102. I know 102 is still low but what could be wrong with my carbs limiting airflow? I've only had the car for about 7 months and stilling learning. (IMG:style_emoticons/default/screwy.gif) (IMG:style_emoticons/default/screwy.gif) |
|
|
|
| Jack Standz |
Jul 21 2023, 01:20 PM
Post
#3
|
|
Member Group: Members Posts: 490 Joined: 15-November 19 From: Happy Place (& surrounding area) Member No.: 23,644 Region Association: None
|
Gotta think it's the testing procedures.
Fully charged battery, remove all spark plugs, etc., etc. Here's just one video on the subject: https://m.youtube.com/watch?v=mOQGz-GQxBI Best wishes. |
 |
|
| slapshot |
Jul 21 2023, 05:55 PM
Post
#4
|
|
Member Group: Members Posts: 144 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains
|
That's a good video. I've watched it before but it was good to watch again. I am planning on getting a leak down tester soon.
The battery I used wasn't the best but it was cranking and I was getting consistent #'s between cylinders. I had all plugs out. I will do a video the next time I test it. Maybe that will show what's up. |
|
|
|
| slapshot |
Aug 20 2023, 04:49 PM
Post
#5
|
|
Member Group: Members Posts: 144 Joined: 11-June 23 From: Utah Member No.: 27,409 Region Association: Rocky Mountains
|
I must have had something wrong when I first did this. Second time the compression was the same. Maybe it was the battery. Anyhow, all is good.
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2025 - 10:27 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.