 Measuring fuel pressure, Help me troubleshoot my Carbs.... |
|
|
|
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. |
|
|
| thomasotten |
 Nov 3 2007, 09:25 AM
Post
#1
|
|
Senior Member  Group: Members Posts: 1,565 Joined: 16-November 03 From: San Antonio, Texas Member No.: 1,349  |
Dual Dellorto carb setup, the carbs tend to snap under load. After tinkering for a while with airflow and linkage and not resolving, I am going to go to basics and check fuel pressure. How do I measure this? Is there an inline guage I can buy?
|
   |
 
|
  |
Replies
| type11969 |
Nov 5 2007, 08:37 AM
Post
#2
|
|
Senior Member Group: Members Posts: 1,231 Joined: 2-December 03 From: Collingswood, NJ Member No.: 1,410 Region Association: North East States |
All sorts of funky crap collects in those acc pump chambers since they are the lowest portion of your carb, it is possible that one side is clogged up pretty good. The acc pump circuit drillings can get clogged also. If there is crud in the acc pump circuit, there can be build up on the seat for the little steel ball that keeps pressure in the circuit therefore bleeding off pressure and only allowing a partial squirt. On the side that has a lesser squirt, if you pump that side multiple times, does the squirt get better? If so, my guess is that those little balls aren't seating.
Last thing, are your pump jets all the same (measured with a jet gauge)? I believe the spec is .2ccs per two full strokes. I use a trimmed down baby medicine dispenser found at CVS to measure (and WD-40 instead of gas if the carb is out of the car). |
|
|
|
Posts in this topic
thomasotten Measuring fuel pressure Nov 3 2007, 09:25 AM
rhodyguy confirm valve adj and timing first thomas. what pr... Nov 3 2007, 10:20 AM
thomasotten
confirm valve adj and timing first thomas. what p... Nov 3 2007, 10:49 AM Bartlett 914
Dual Dellorto carb setup, the carbs tend to snap ... Nov 3 2007, 10:23 AM lotus_65 you have a return setup still, right?
you HAVE to ... Nov 3 2007, 12:55 PM McMark :agree: and you've got a quality pump, so get ... Nov 3 2007, 12:56 PM lotus_65 oh yea, and a gauge. mine's pretty lame compar... Nov 3 2007, 01:09 PM rhodyguy the cb pump he's running does not have a retur... Nov 3 2007, 01:32 PM thomasotten Ok, I just finished adjusting the valves. Nothing... Nov 3 2007, 04:11 PM Twystd1 Your lean going into the transition.
About where ... Nov 3 2007, 04:37 PM thomasotten
Your lean going into the transition.
About where... Nov 3 2007, 06:46 PM Aaron Cox only if you want them to squirt the same amount :)... Nov 3 2007, 06:55 PM thomasotten I'm on it... but, is there a general rule as t... Nov 3 2007, 07:07 PM McMark You can get a small vial that can be lowered down ... Nov 3 2007, 07:18 PM Twystd1 Try about 1/3rd from top of threads.
If no worky.... Nov 3 2007, 07:41 PM thomasotten
Try about 1/3rd from top of threads.
If no worky... Nov 4 2007, 03:03 PM ConeDodger Thomas,
My Dells had a pretty good vacuum leak at ... Nov 4 2007, 03:35 PM thomasotten I actually watched the accelerator squirt into eac... Nov 4 2007, 07:22 PM McMark Get ready to catch some fuel when you undo those f... Nov 4 2007, 11:02 PM thomasotten Well, I took the carbs off, and made sure the acce... Nov 9 2007, 04:19 PM type11969 Did you clean out the acc pump circuits?
Did you v... Nov 9 2007, 04:32 PM Thack Sounds like you are too lean. Are "idle... Nov 9 2007, 05:16 PM |
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 9th May 2025 - 04:22 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.