 Carburetored type IV engine problem diagnosis., Engine idling problem. |
|
|
|
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. |
|
|
| Keith914 |
 Oct 21 2016, 07:00 PM
Post
#1
|
|
Member  Group: Members Posts: 248 Joined: 29-April 16 From: Laguna Beach, California 92651 Member No.: 19,948 Region Association: Southern California  |
Just completed very careful cleaning, installing, adjusting, balancing two Weber carbs on my recently rebuilt '72 1.7 type IV 914 engine upgraded to 2.4 L. Carbs are real Webers (Spain), and we're working well earlier. Balancing and setting idle at 1,100 rpm was done on cold engine - nice smooth idle and solid response to accelerator action. The carbs are 44's, idle jets are 55's, main jets are145's and the air jets are 200's. Sea level ambient condition.
Engine starts immediately and runs very well and continues to run very well above about 2,000 rpm. But once engine is approaching and then at normal operating temp - 190 F, it will not run smoothly below about 2,000 rpm, and at idle accelerator position, engine drops below 1,000 rpm and stumbles to stalling sometimes with pre ignition sounds as it stalls! Timing is set at 32 degrees at 3,000 rpm, and distributor is new with new Pertronix electronic unit, and no vacuum mechanism. Welcome any diagnosis suggestions. |
   |
 
|
Posts in this topic
Keith914 Carburetored type IV engine problem diagnosis. Oct 21 2016, 07:00 PM
injunmort all linkages and actuators are sync, try 34 degree... Oct 21 2016, 07:44 PM Keith914
Just completed very careful cleaning, installing,... Oct 21 2016, 08:50 PM Keith914 Here is a pic of the linkage. Oct 21 2016, 08:52 PM
Keith914
Here is a pic of the linkage.
Here is a better ... Oct 21 2016, 09:00 PM Valy You should adjust carbs when engine is warm, not c... Oct 21 2016, 09:00 PM Keith914
You should adjust carbs when engine is warm, not ... Oct 21 2016, 09:11 PM stugray Sounds like an ignition problem not carbs.
Is you... Oct 21 2016, 11:06 PM flyer86d Clogged idle jet. Oct 22 2016, 05:03 AM Keith914 Removed the carbs again and inspected the float ad... Oct 22 2016, 08:51 PM stugray
Removed the carbs again and inspected the float a... Oct 22 2016, 09:06 PM Keith914
Removed the carbs again and inspected the float ... Oct 23 2016, 08:24 PM cgnj
Removed the carbs again and inspected the float a... Oct 25 2016, 04:03 PM McMark What's your advance at idle?
Get a modern adj... Oct 24 2016, 07:21 AM porschetub That fuel pressure is very high,that would cause t... Oct 24 2016, 02:22 PM Racer Chris
These are large carbs for a 1.7 what size ventur... Oct 24 2016, 03:11 PM Mr Pharmacist I had idling issues for ages on my 2056 with 40 ID... Oct 25 2016, 01:54 AM Keith914 One more issue identified. The gaskets between the... Oct 25 2016, 09:12 AM rhodyguy Don't tighten one carb to intake nut fully. Br... Oct 25 2016, 09:37 AM Eric_Shea You have to use a syncrometer.
http://www.914worl... Oct 25 2016, 11:32 AM Elliot Cannon My type IV is 2.2. I also have 44idf Webers. I... Oct 25 2016, 02:16 PM Vacca Rabite I also had idle issues for a while. It turned out... Oct 26 2016, 06:07 AM Keith914 More good advice thanks. I have used/adopted all t... Oct 26 2016, 08:50 AM Keith914
More good advice thanks. I have used/adopted all ... Oct 30 2016, 03:06 PM Keith914
More good advice thanks. I have used/adopted all... Oct 31 2016, 08:41 PM Localboy808
[quote name='Keith914' post='2417711' date='Oct 3... Nov 1 2016, 06:56 PM  |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 5th May 2024 - 06:12 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.