 More Questions - Rough running, What am I missing? |
|
|
|
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. |
|
|
  |
| NotLance |
 Nov 14 2025, 07:53 PM
Post
#21
|
|
Member  Group: Members Posts: 104 Joined: 4-February 21 From: Northern California Member No.: 25,165 Region Association: Northern California  |
One of my buddies (An american car enthusiest (IMG:style_emoticons/default/ar15.gif) ) also said new spark plug wires wouldn't hurt in case one of them is running a bum signal, thoughts?
|
   |
 
|
| emerygt350 |
Nov 14 2025, 07:56 PM
Post
#22
|
|
Advanced Member Group: Members Posts: 3,392 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Hah, you have a real nice bit of tin there! Mine is so old and poorly fitting I can see behind it. So no flywheel view for you! That is fine. If you had real improvements from the carb work I would just get that timing light and see how it goes with what you have. Any modified engine will have different needs from stock, particularly if your compression has changed. I would establish where your timing is now, and try advancing it a degree, see how it responds. If that improves things, try another degree. If advancing it doesn't improve things go the other way a degree. Once you feel like your getting good changes even a half degree can make a difference.
Do you have a cylinder head temperature gauge? And yes. New wires couldn't hurt, but they do cost as much as a timing gun... |
|
|
|
| emerygt350 |
Nov 14 2025, 07:58 PM
Post
#23
|
|
Advanced Member Group: Members Posts: 3,392 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
And by response, I mean taking it for a drive. Not just revving in the driveway.
|
|
|
|
| NotLance |
Nov 14 2025, 08:49 PM
Post
#24
|
|
Member Group: Members Posts: 104 Joined: 4-February 21 From: Northern California Member No.: 25,165 Region Association: Northern California |
I've acquired a timing gun, and hunted through my fan.
There was two marks, a red and a white mark, probably either from when auto atlanta built the first engine or when the shop installed it. A white and a red paint mark. I could see them at different timings at different revs, but in it's current state of running okay here is where they lie. The white mark is 7* at idle, ~30* at 3500 rpm The red mark is 27* at idle, ~50* at 3500 rpm There is no way im at 50* right... (right???) , so maybe the red is if setting at idle and white is setting at 3500? also of note he reduced the fuel pressure from 3.5 to 3 lbs, said too much pressure would overwelm the carbs. (IMG:style_emoticons/default/confused24.gif) if it works it works |
|
|
|
| Superhawk996 |
Nov 15 2025, 08:40 AM
Post
#25
|
|
914 Guru Group: Members Posts: 7,521 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
|
QUOTE(NotLance @ Nov 14 2025, 10:49 PM)  There is no way im at 50* right... (right???) , so maybe the red is if setting at idle and white is setting at 3500? The red mark has zero significance when using a dial back timing light. Take a few minutes and read the attached link. https://www.onallcylinders.com/2020/07/10/h...timing-light-2/ |
 |
|
|
3 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
2 Members: Superhawk996, mate914
|
Lo-Fi Version | Time is now: 15th November 2025 - 09:16 AM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.