 Giving Up On Vacuum Advance |
|
|
|
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. |
|
|
| Ansbacher |
 Jan 18 2019, 06:22 PM
Post
#1
|
|
Senior Member  Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589  |
Car = '74 2.0 Liter, Dual Dellorto Carbs
For years I have been 'adequately" running an 009 mechanical only distributor. Finally took the pervasive advice out there to go with a vacuum advance dizzy from a 1.8L 914. Since only one of my Dellorto carbs had an existing vacuum port (ported type), I had to drill a port in my other one (no problem there). I used good quality anti-pulse valves in the lines and measured a maximum vacuum of 12 inches of mercury with partial throttle. Installed the 1.8 dizzy and set the timing, first without the vacuum lines attached. To satisfy my usual 30-32 degrees at 3500 RPM, the idle timing had to be at about 5-6 degrees (quite low for my setup which is happier at about 10 degrees. When I attached the vacuum lines my timing at 3500 RPM went sky high into the 40s. This seems way too high. Is this normal? Overall, I found the car to run better without the vacuum attached and the carbs plugged off. Am I doing something wrong here? I don't like the numbers I am getting. Everyone said this was the way to go with carbs, but I am not seeing results. Advice appreciated. Ansbacher |
   |
 
|
Posts in this topic
Ansbacher Giving Up On Vacuum Advance Jan 18 2019, 06:22 PM
nditiz1 Ditch that distributor and get the correct one for... Jan 18 2019, 11:11 PM pete000 The 123 Dist is the way to go and no need for vac ... Jan 19 2019, 01:15 AM Tbrown4x4 I'll be watching this with interest. I'm g... Jan 19 2019, 03:57 AM nditiz1 I can't find the diagram right now, but someon... Jan 19 2019, 07:57 AM BK911 I've been running an 009 with carbs on a 1.7 f... Jan 19 2019, 08:17 AM
nditiz1
I've been running an 009 with carbs on a 1.7 ... Jan 19 2019, 08:22 AM
Rand
I've been running an 009 with carbs on a 1.7 ... Jan 28 2019, 02:16 PM 72hardtop
I've been running an 009 with carbs on a 1.7... Jan 28 2019, 08:52 PM tmessenger SVDA 034 here's what they say for timing: Use... Jan 19 2019, 09:13 AM cgnj How much vacuum @ idle? How much @ 3k?
7.5 degrees... Jan 19 2019, 10:10 AM Ansbacher
How much vacuum @ idle? How much @ 3k?
7.5 degree... Jan 19 2019, 03:05 PM tmessenger Mechanical advance springs fatigue with age, with ... Jan 20 2019, 09:50 AM 914_teener I went through a tremendous amount of effort to fi... Jan 19 2019, 04:14 PM pete000 I love my blue tooth programmable 123 so easy and ... Jan 19 2019, 04:35 PM porschetub My research indicated the anti pulse valve is only... Jan 19 2019, 08:14 PM Mark Henry Engine I just built for a customer, 914 2056cc wi... Jan 19 2019, 10:13 PM Mark Henry I've had a couple guys ask about the linkage, ... Jan 20 2019, 09:42 AM Ansbacher Answers to some questions posed of me:
Yes, I am ... Jan 20 2019, 11:33 AM r_towle Based upon what is going on, and your last questio... Jan 20 2019, 07:44 PM 72hardtop Don't attempt to 'T' the lines togethe... Jan 22 2019, 03:00 AM Ansbacher
Don't attempt to 'T' the lines togeth... Jan 22 2019, 12:02 PM 72hardtop
Don't attempt to 'T' the lines toget... Jan 22 2019, 01:15 PM IronHillRestorations One thing I forgot to mention is that the 1.8 dist... Jan 22 2019, 06:48 AM Red72 Jumping in here, and I'm sorry to hijack it so... Jan 28 2019, 11:21 AM tmessenger I went through this with a Triumph TR3 a couple of... Jan 28 2019, 12:40 PM Rand Did you just suggest that you can create so much h... Jan 28 2019, 09:05 PM 72hardtop
Did you just suggest that you can create so much ... Jan 29 2019, 02:42 PM Rand Let me take this second to say that I respect Joe ... Jan 28 2019, 09:21 PM MarkV No doubt fuel injection is better. Many of us have... Jan 28 2019, 09:22 PM 914_teener Ok....I'm an EFI guy so for carbs it's th... Jan 29 2019, 04:30 PM 72hardtop
Ok....I'm an EFI guy so for carbs it's t... Jan 29 2019, 05:04 PM 914_teener https://web.archive.org/web/20001007043902/...ch/d... Jan 29 2019, 04:49 PM 914_teener Well then another dumb bunch of questions:
Isn... Jan 29 2019, 06:49 PM 72hardtop Corrected. Got ahead of myself there. Ported vac a... Jan 30 2019, 10:46 PM tmessenger Ported vacuum with vac port covered by the throttl... Jan 31 2019, 08:23 AM cgnj
Ported vacuum with vac port covered by the thrott... Jan 31 2019, 08:31 PM tmessenger There are 11 years of knowledge in those 99 pages.... Jan 31 2019, 10:06 PM 72hardtop
Ported vacuum with vac port covered by the thrott... May 8 2019, 03:54 PM 72hardtop You can garner a lot from that thread with the fir... Jan 31 2019, 11:18 PM tmessenger 72hardtop
Sounds like we have very similar engine... Feb 1 2019, 01:28 PM 72hardtop
72hardtop
Sounds like we have very similar engin... May 8 2019, 03:47 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 - 02:38 PM |
Invision Power Board
v9.1.4 © 2025 IPS, Inc.