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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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 Posted: Sat Aug 09, 2014 7:15 am Post subject: |
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| W1K1 wrote: |
again, the mixture screw adjusts the carb at idle and only at idle. I can adjust the my 56 idle jet to idle at 10 afr (rich) or 17 afr (lean) but it's only during idle. When you are driving you are drawing fuel from the idle jet or the main jet. Different circuit and different air fuel mixture depending on the jetting.
when my car is warm at idle it sits at 13.5 afr, when i'm driving that same idle jet is reading 15.5 afr at part throttle, but for the first few minutes, until the engine is warm that same idle jet bucks and sputters at 17 afr
you still didn't tell us what jetting you have in there, is it the same as what is listed in the book? You could be lean on the idle and rich on the main or vice versa |
Okay I checked all and the numbers are correct on all you told me. took me a min to find the vent..then I saw it was venturi number. Lol I ordered 2 rebuild kits. So will have to wait to get them all. But should I replace all the jets with new ones since I am rebuilding the carbs? |
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W1K1
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Joined: March 04, 2004
Posts: 4919
Location: Southern AB
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| Posted: Sat Aug 09, 2014 9:57 am Post subject: |
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no, you don't need to replace jets, what you have is supposed to be good for a 1600cc. but if your plugs are that dark you can try one size smaller on both idle and main. The popping could be caused by a vacuum leak on the manifold.
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1973 super
1965 squareback 1500E
1971 bay window westy- subi swap |
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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Thu Aug 14, 2014 12:10 pm Post subject: |
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| W1K1 wrote: |
| no, you don't need to replace jets, what you have is supposed to be good for a 1600cc. but if your plugs are that dark you can try one size smaller on both idle and main. The popping could be caused by a vacuum leak on the manifold. |
Okay well I got the ones I ordered. So Ill test them out. And we will see the outcome. Well and a vacuum leak I sprayed at the intakes and it didnt have a change or anything. So there isnt a leak. I mean it starts up great and idles but when I rev it it strts to pop. So Ill check it all out now as I am off and Ill let ya know later what happened. |
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W1K1
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Joined: March 04, 2004
Posts: 4919
Location: Southern AB
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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Aug 15, 2014 12:06 pm Post subject: |
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| W1K1 wrote: |
| if you can get some video/audio of what its doing that would help |
Okay well cant get it started. I static timed it and everything but battery also has 12.7 volts. Shouldnt that be enough juice to start it or should I buy a new one? I had it for like a year and a half. and just ont charge up to 13 or 14 volts of how it should be. points are set right and i see a white spark but the timing lite is a dim lite so I dont know if it is actually getting enough juice. I also set the carbs to setup specs in butterfly gap and also idle mixture. and hooked the linkage up and all. |
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imz8478
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Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Aug 15, 2014 1:51 pm Post subject: |
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Okay and check out thiss problem. It is at TDC and the dizzy drive shaft seems to me not to be at 60 degrees at all. It skips from 70 to like 40 or 45. Where is the 60 degree?
Here it is at 70*
And to me this would look like the 40 degree mark
Looks like its off
Id have a video if cn get it started for you and on idle. Lol Sorry. but I am so frustrated this point. It cranks strong with the 13 volts. And putts here and there but wont idle or run no. So lost now. |
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imz8478
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Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Aug 15, 2014 3:36 pm Post subject: |
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| W1K1 wrote: |
| if you can get some video/audio of what its doing that would help |
Okay here is a video. Oh and yup got it started. Turned it back 1 tooth which looked like a 40 degree which actually was the 60 degree. It fired right up and stayed running. So here is the video. I reved it a bit to you can hear the popping.
http://youtu.be/vLdTAmiwpZQ |
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Mike Fisher
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Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
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| Posted: Fri Aug 15, 2014 5:09 pm Post subject: |
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So, you didn't even buy any smaller jets to try in it?
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69 FI/AT square Daily Driver
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'68 Karmann Ghia sold
Society is like stew. If you don't keep it stirred up you end up with a lot of scum on the top! - Russ_Wolfe/Edward Abbey |
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W1K1
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Joined: March 04, 2004
Posts: 4919
Location: Southern AB
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| Posted: Fri Aug 15, 2014 8:07 pm Post subject: |
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that sounds like a blocked idle jet pfffft. or the engine just not warmed up yet. Mine will bark and fart like that for the first few minutes.
but if it does that while you are cruising at a consistent speed on the idle circuit and just randomly does it it is usually just a blocked idle jet passage.
Just one carb doing it?
does it go away when you get on the gas? AKA the mains.
_________________
http://www.thesamba.com/vw/archives/manuals/jim_martin_engine_build.php
1973 super
1965 squareback 1500E
1971 bay window westy- subi swap |
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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Aug 15, 2014 9:07 pm Post subject: |
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| W1K1 wrote: |
that sounds like a blocked idle jet pfffft. or the engine just not warmed up yet. Mine will bark and fart like that for the first few minutes.
but if it does that while you are cruising at a consistent speed on the idle circuit and just randomly does it it is usually just a blocked idle jet passage.
Just one carb doing it?
does it go away when you get on the gas? AKA the mains. |
yeah it did it when I opened up a little. Should I try the smaller idle jets I got? When I get on the gas as you saw in the video it still did it. but not as bad as it did before. Before it was bad backfiring. but seems it dimmed out a lot. Ill try it again tomorrow morning before work and see how it goes wth the smaller jets. |
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imz8478
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Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Aug 22, 2014 6:54 pm Post subject: |
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| W1K1 wrote: |
that sounds like a blocked idle jet pfffft. or the engine just not warmed up yet. Mine will bark and fart like that for the first few minutes.
but if it does that while you are cruising at a consistent speed on the idle circuit and just randomly does it it is usually just a blocked idle jet passage.
Just one carb doing it?
does it go away when you get on the gas? AKA the mains. |
Okay I changed the idle jets to the new ones I had before and cleaned the others out. Seems that the backfiring got worse. Its coming out the carbs and out the muffler. And black smoke pops out afterwards. So I will do this again tomorrow and see what happens. It was doing it through both carbs but not as bad. But now after changing the idle jets to the smaller ones it sounds horrible. So back to the drawing board tomorrow. Check for vacuum leaks. |
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Bobnotch
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Joined: July 06, 2003
Posts: 22413
Location: Kimball, Mi
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| Posted: Sat Aug 23, 2014 8:07 am Post subject: |
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| W1K1 wrote: |
that sounds like a blocked idle jet pfffft. or the engine just not warmed up yet. Mine will bark and fart like that for the first few minutes.
but if it does that while you are cruising at a consistent speed on the idle circuit and just randomly does it it is usually just a blocked idle jet passage.
Just one carb doing it?
does it go away when you get on the gas? AKA the mains. |
I remember way way back in the early 90's I had a set of Dellorto FRDs. I was constantly chasing them, trying to get them to run right.  Eventually, I gave up, and put a set of Webers on it (from CB Performance), and never had that issue again. I don't know if my FRDs were worn out, or jetted wrong, or if it was just a case of chasing the different weather patterns trying to get them to work right, but it was very frustrating. 
All I do know, is that I like Solex carbs, and real Weber ICTs, if you're going to run single throat carbs. Those carbs just seem better suited for our cars. 
Some here have had good luck running the chinese weber copies, but I've only seemed to have problems with them, mainly due to incorrect jetting, and no balance tube. Well that and the crappy linkage set up they come with. I think I've set up 3 sets of them, only to have to re-jet them, and add a balance tube to them. With the CB kits I've installed, it's always been plug and play. 
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71 Notch ...aka Krunchy; build pics here;
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| People keep confusing "restored" and "restroyed". |
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cdgvw1
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Joined: July 24, 2006
Posts: 77
Location: Sacramento, Ca.
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| Posted: Tue Sep 23, 2014 4:28 pm Post subject: |
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It sounds like one carb may not be getting any or enough accelleration enrichment. Leave the engine OFF. Look down each carb and throttle it. Are you getting an equal amount of fuel squirt in both carbs? Try to only throttle it a couple times so you don't flood the engine with excess fuel.
How are you synching the carbs? Do you have a synchrometer or air flow meter?
Chris |
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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Oct 03, 2014 11:52 am Post subject: |
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| Update: I finally got them done and it runs great. Once warmed up a bit it got rid of the hiccups.So awesome! Thanks all. |
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Mike Fisher
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Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
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| Posted: Fri Oct 03, 2014 12:58 pm Post subject: |
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Good, but you don't tell us What actually was the problem? 
_________________
https://imgur.com/user/FisherSquareback/posts
69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold
Society is like stew. If you don't keep it stirred up you end up with a lot of scum on the top! - Russ_Wolfe/Edward Abbey |
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imz8478
Samba Member
Joined: June 08, 2010
Posts: 188
Location: NC
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| Posted: Fri Oct 03, 2014 1:18 pm Post subject: |
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| Yeah cause its been a while. What it was is the tooth on the dizzy drive. And the weird thing is I dont remember messing with it when I had it set the first time. When I say saying it was 70 degrees it was actually 60. But I kept switching it back and trying it and then switching it again. i just hate how you have to eyeball it and see if its on or not. But shims or washers are still there as I carefully switched it. And then got them synced and runs great. Sounds sweet. And Its not too rich and lean. Its pretty good in the middle. Purrrrs nicely. My first type 3 as I owned bugs in the past. So this is all new but getting knowledge of them thanks to all of you guys. |
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