TheSamba.com :: View topic

Sun Oct 27, 2019 7:34 pm

I am struggling with my carbs. Here is my challenges and I can’t be the only one who is done something dumb. Pulled off kadrons

IDF, dual 40mm, standard jets, Venturi 28, f11 tubes .50 idle, air, mains out of the box etc.

Engine AE code 1972:
1641cc
041 heads
Stock rockers
C/W crank balanced with 12 lb flywheel
009 distributor with points

Here we go,
Engle 110 cam

Can’t get an idle to save my life, runs super rich just horrible. Very frustrating

What jetting and Venturi combination would work best for a decent idle and runs good not great.

What timing?

Help Samba group?

Sun Oct 27, 2019 7:44 pm

try some 45 or 47.5 idle jets from ACN. http://vwparts.aircooled.net/Weber-IDF-DCNF-Idle-Jets-p/74405.htm

Sun Oct 27, 2019 8:49 pm

I did try the .45 idle and ran less rich but still struggled with idle and he air flow adjustment screws had no impact the idle did not fall of in either direction in or out.

Sun Oct 27, 2019 9:53 pm

jpsport wrote: I did try the .45 idle and ran less rich but still struggled with idle and he air flow adjustment screws had no impact the idle did not fall of in either direction in or out.

If adjusting the idle screws have no effect I would guess your idle jets are plugged or throttle plates are to far advanced.

Did you do a pre set before installing?

Mon Oct 28, 2019 3:20 am

check the enrichment plungers, had a pair stuck once :wink:

Mon Oct 28, 2019 4:56 am

Any carb/s I buy. Get cleaned and the floats set before installation.
It does not matter who I get them from. The carbs get a rough handling during shipping.
Did you check the float level?

Mon Oct 28, 2019 6:04 am

madmike wrote: check the enrichment plungers, had a pair stuck once :wink:

I've always been under the impression that unless you are using the chokes, those plungers have no impact anyway, which is why some many people shove them all the way down (closing off the circuit) and install plugs. :?

Mon Oct 28, 2019 6:17 am

What is a enrichment plunger never heard of that one.

Mon Oct 28, 2019 6:37 am

What is your fuel pressure? 50 idles will be close enough.
Check your float heights
Re sync. them, make sure your throttle linkage is dead nuts even on each carb
You need to have responding A/F mixture screws at idle on all 4 holes before you move forward with tuning.

Mon Oct 28, 2019 6:45 am

jpsport wrote: What is a enrichment plunger never heard of that one.

They are behind a backing plate on 99% of the IDF bodied carbs.. hardly anyone actually uses a choke circuit these days...

https://www.thesamba.com/vw/forum/viewtopic.php?p=5560887

Mon Oct 28, 2019 9:52 pm

47.5 idles

10-11mm float height with gasket in place ball NOT depressed

Fuel pressure 3-3.5psi max (critical)

115 mains

190 air corrector jets

And get an SVDA on it.

Sun Nov 03, 2019 8:30 am

Will a SVDA actually work with a cam that big on a 1641 cc engine.

Sun Nov 03, 2019 9:13 am

jpsport wrote: Will a SVDA actually work with a cam that big on a 1641 cc engine.

Optimally? Likely not. Other option pony up for a CB black box