 Carb throat popping at speed, New 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. |
|
|
| LetoAtreides |
 Aug 15 2008, 10:38 PM
Post
#1
|
|
Member  Group: Members Posts: 86 Joined: 15-May 07 From: Half Moon Bay, California Member No.: 7,739 Region Association: None  |
Ok, so I know I've posted this before, but I still cant figure it out, and I need to know all of the possible circumstances under which this condition occurs.
One of the throads on my dual carbs is excessively lout at speed. It sounds like pop-pop-pop. Any ideas? |
   |
 
|
  |
Replies
| ArtechnikA |
Aug 16 2008, 09:10 AM
Post
#2
|
|
rich herzog Group: Members Posts: 7,390 Joined: 4-April 03 From: Salted Roads, PA Member No.: 513 Region Association: None |
also - check for bad, bent, or misaligned linkage.
check for synchronization at idle with a SynchroMeter and then eyeball part- and full-throttle. If the carbs open at different rates because of linkage lever arm length or angularity differences, they'll go out of sync. That can cause this. And this presumes that your valve adjustment and ignition timing are spot-on. Many if not most 'carburetion' problems are actually elsewhere. |
|
|
|
Posts in this topic
LetoAtreides Carb throat popping at speed Aug 15 2008, 10:38 PM
r_towle well, its lean.
How it has become lean could be al... Aug 15 2008, 11:13 PM drive-ability
Ok, so I know I've posted this before, but I ... Aug 15 2008, 11:14 PM Elliot Cannon If it accelerates OK but starts popping when you a... Aug 15 2008, 11:23 PM LetoAtreides Update!
I adjusted the linkage on one side, a... Aug 16 2008, 04:57 PM LetoAtreides So i think I've pretty much fixed my popping p... Aug 20 2008, 12:56 PM r_towle What is your timing set at???
Rich Aug 20 2008, 01:11 PM LetoAtreides I timed it using an electronic tach. I rotated th... Aug 20 2008, 02:15 PM ArtechnikA Normally I am a very patient person but this has p... Aug 20 2008, 03:26 PM Mark Henry I understand how Rich feels, the T4 doesn't li... Aug 20 2008, 03:39 PM LetoAtreides Sorry for testing your patience, ArtechnikA, let m... Aug 20 2008, 05:26 PM
ArtechnikA
I'm 19 years old and learning to work on my o... Aug 20 2008, 07:07 PM LetoAtreides Thanks for the info.
How much is a smidge? is i... Aug 20 2008, 10:32 PM r_towle I will try to clarify.
Step one.
Static time the ... Aug 20 2008, 10:52 PM LetoAtreides Ok, cool.
I checked the points and dwell angle ve... Aug 20 2008, 11:03 PM ArtechnikA 27, 28 - that's probably as close as most of u... Aug 21 2008, 06:47 AM rhodyguy i suggest you limp or tow your car to High Perfoma... Aug 21 2008, 09:15 AM LetoAtreides
Yeah, I've done business with Rich, and he... Aug 21 2008, 01:39 PM LetoAtreides Ok, so I timed my car by the book, and it idles a ... Aug 22 2008, 05:17 PM ArtechnikA
Ok, so I timed my car by the book, and it idles a... Aug 22 2008, 06:28 PM LetoAtreides Dellorto:
main jet 36
Venturii 140
I don't kn... Aug 22 2008, 09:20 PM ArtechnikA
Dellorto:
main jet 36
Venturii 140
Ahhh - no.
Th... Aug 23 2008, 07:00 AM LetoAtreides Ok, sorry about the bogus numbers. I thought the ... Aug 23 2008, 10:39 AM LetoAtreides Ok, main jet is 140
pump jet is 35
I'll have t... Aug 23 2008, 10:48 AM LetoAtreides idle jet is 55
throat is 40
sparks are nice and b... Aug 23 2008, 05:28 PM ArtechnikA
Tried driving it a bit today and no backfires whi... Aug 24 2008, 07:09 AM rhodyguy what are the flow #s as indicated on your synchron... Aug 24 2008, 07:46 AM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 4th June 2025 - 01:50 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.