Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
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.
 

Welcome Guest ( Log In | Register )

> Correct fuel pressure for dual carbs?
terrymason
post May 16 2007, 11:16 PM
Post #1


Member
**

Group: Members
Posts: 346
Joined: 23-November 05
From: Virginia Beach
Member No.: 5,174



I'm having alittle trouble getting my dual carbs dialed in, the 1st is rich, and the second is lean. My fuel pump was putting out 3.5psi, but the guy I bought my carbs from said I should run 2.6psi instead. What do you guys think?

I've got 60 idle jets and 180 mains, which I thought was overkill, until he told me that I should run 2.6 instead of 3.5 psi.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
Reply to this topicStart new topic
Replies
terrymason
post May 17 2007, 11:08 AM
Post #2


Member
**

Group: Members
Posts: 346
Joined: 23-November 05
From: Virginia Beach
Member No.: 5,174



I talked to Aaron from CB performance, who was awesome. He asked some really good questions, and I think has put me on the right track. A couple of things that came from it.

1. covering the barrel of the first carb will kill the engine - covering the barrel of the second carb does nothing.
2. no amount of adjustments seem to do anything to the second carb.

It really sounds like I have a air leak in my second carb. When I go home tonight, I'm going to spray carb cleaner around and see if I can find it. That would pretty much explain alot of what I'm seeing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Gint
post May 17 2007, 05:36 PM
Post #3


Mike Ginter
***************

Group: Admin
Posts: 16,098
Joined: 26-December 02
From: Denver CO.
Member No.: 20
Region Association: Rocky Mountains



QUOTE(terrymason @ May 17 2007, 10:08 AM) *

I talked to Aaron from CB performance, who was awesome. He asked some really good questions, and I think has put me on the right track. A couple of things that came from it.

1. covering the barrel of the first carb will kill the engine - covering the barrel of the second carb does nothing.
2. no amount of adjustments seem to do anything to the second carb.

It really sounds like I have a air leak in my second carb. When I go home tonight, I'm going to spray carb cleaner around and see if I can find it. That would pretty much explain alot of what I'm seeing.

You mentioned once that you were going to check/change linkage adjustment for one carb. If you haven't verified that the carbs are sync'd *without* the linkage attached, then you are not starting at ground zero.

No amount of adjusting the the carb that doesn't seem to do any good is worth much until you've verified that the carbs are sync'd *without* the lnkage attached.

Seriously, start over, from the beginning. Remove the linkage and sync the carbs without the linkage attached. Then try adjusting that carb and see what happens. Personally, I'd start at the very begining (in fact I just did two weeks ago) and rebuild the carbs and set those floats first.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

Posts in this topic
terrymason   Correct fuel pressure for dual carbs?   May 16 2007, 11:16 PM
john rogers   I ran 3.5 PSI with my four cylinder engines and ab...   May 17 2007, 12:23 AM
So.Cal.914   3.0 lbs.   May 17 2007, 02:03 AM
lotus_65   2.5 lbs   May 17 2007, 06:25 AM
SGB   60s are mighty big. How big is the motor? for ma...   May 17 2007, 06:59 AM
type11969   The self-regulated pumps sold by VW shops for dual...   May 17 2007, 08:33 AM
rhodyguy   any other symptoms? snapping/popping back thru the...   May 17 2007, 09:35 AM
terrymason   any other symptoms? snapping/popping back thru th...   May 17 2007, 09:45 AM
terrymason   I'm running 60 idle jets, 140 main jets, and 1...   May 17 2007, 09:39 AM
rhodyguy   sometimes a bit more info is helpful. no mention o...   May 17 2007, 09:52 AM
terrymason   sometimes a bit more info is helpful. no mention ...   May 17 2007, 10:34 AM
type11969   If you have the dellorto superperformace tech book...   May 17 2007, 09:58 AM
rhodyguy   the only reason i suggest turning the idle up is t...   May 17 2007, 10:49 AM
Travis Neff   does your pump rattle a bunch? That would be an i...   May 17 2007, 10:57 AM
terrymason   does your pump rattle a bunch? That would be an ...   May 17 2007, 11:22 AM
type11969   Check to make sure your idles are clear, also veri...   May 17 2007, 11:00 AM
terrymason   I talked to Aaron from CB performance, who was awe...   May 17 2007, 11:08 AM
Gint   I talked to Aaron from CB performance, who was aw...   May 17 2007, 05:36 PM
rhodyguy   "no ammount of adjustments"...are you re...   May 17 2007, 11:15 AM
terrymason   "no ammount of adjustments"...are you r...   May 17 2007, 11:18 AM
type11969   Plugged idle jet or circuit   May 17 2007, 11:16 AM
Travis Neff   Sounds like you do have a facet pump. The CB rota...   May 17 2007, 11:24 AM
rhodyguy   facets suck. get #3193. the canister to the right ...   May 17 2007, 11:34 AM
terrymason   I have some 46 and 52 idle jets at home (60s insta...   May 17 2007, 02:18 PM
type11969   I'm running a 1.8, little warmed over than sto...   May 17 2007, 02:39 PM
anderssj   Terry, I have some spare jets here in Yorktown--m...   May 17 2007, 04:01 PM
type11969   :agree: I fought with my dells and got sick of s...   May 17 2007, 06:38 PM
r_towle   You may have a simple air leak at the intake bolts...   May 17 2007, 09:50 PM
terrymason   Well, I believe that I've found the main probl...   May 17 2007, 10:10 PM
Gint   It just plain makes good sense. You'll establ...   May 17 2007, 10:18 PM
terrymason   I'm still fighting this thing, and am ready to...   Jun 3 2007, 05:00 PM


Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 



- Lo-Fi Version Time is now: 11th July 2025 - 08:56 AM