Progressive carb jetting

[bigdaddy]

Hey guys, My Weber carb is running way rich. It's a progressive 32/36, can any one let me know what size jets I should start at?

[keifernet]

what are the engine specs, size Etc.... and is it has it been serviced/ tuned properly( valve adjustment, ignition components/ timing/ plugs etc.?) recently before you get to thinking it's just the carb?

[bigdaddy]

It's a 1679 dual port. Since building I've only got 1500 miles on it. Everything is set properly. Alot of black smoke out of exhaust and plugs are also very black.

[bigdaddy]

The carb was new when installed. Thanks for the help, no one in my area seems to know.

[keifernet]

I'm wondering how your idle stop screw and idle mixture are tuned, and the crew on the fast idle cam of the choke... and if the choke is set too rich or not working/ going off at all?

do you have any Idea, have you been tuning it or someone else...?
unless you got a carb jetted for a different engine by mistake ( it can and does happen... a carb for a type 4 2.0 L bus engine showed up in a kit for a 1600 type 1 or 3 on a few occasions... damn stockboy! LOL)

the jetting should be right and you have a set-up tuning issue or maybe a primary igniton ( weak spark?) problem

I will confirm jet sizes this afternoon and post back tonight.
meanwhile if you haven't seen this check it out...

http://www.redlineweber.com/html/Tech/carburetor_set_up_and_lean_best_.htm

[keifernet]

Okay, I took the tops off 6 carbs.... 4 genuine webers and 2 " holley" webers.

I think maybe one of them was untouched and probably jetted for a type2/4 late model bus

but here is a breakdown of what I found... and what I know about the carbs, I built/jetted 2 of them and saw at least one of the others run( #3)
I have also built/ jetted several others but could not find my notes on them as it was over several years time.
I have a Jet box of accumulated parts that amazed even me since I have not looked in it recently. (I may do an inventory and take a digi pic of it)

#1. this carb came off a 1641 I built with a bugpack 4061 cam, all else basically stock except the usual, 009, header, stainless valves...

It ran great with this combo... 132/ 137 main jets 165/180 air jets and I couldn't make the #'s out on the air tubes ( under the air jets, use a sheet rock or other screw to lightly grab the tube and it pulls right out)
but I think they were " F66"

#2 both mains were 140 both airs were 165 and both air tubes were F66
I think this is the bus carb combo as from the supplier, but cannot be 100% sure ( and it does not apply to this guys deal but I am posting anyway to use this thread for a reference later)

#3 140/ 147 mains 165 air, F66 tubes.
I think this one was jetted up for an 1835 bug motor with a cam and 041 heads on it... (kid blew it up and it was traded in for a stock to get back and forth to work and school)

#4 135/140 mains, 165 and 210 air and unmarked tubes
this carb I jetted up funky to run on a 1641 with a Scat C-35 cam ( a bit big but hauled butt for 1600 at a certain RPM range, but this combo worked well....)


Let me say a little about the air tubes at this point...
Weber and "holley weber" used different numbers on these tubes,
Holley webers were on for Pinto and small pickup trucks in the 70's early 80's... they were 2.0 engines and the carbs I have gotten a hold of had big jets ( main and air) and different types of air emultion tubes than the webers provided for VW's
they had more holes in them and I used some of those in some of my experimentaiton. some say "05"on them and some were not marked at all but you could tell by all the holes in them they flowed more air. and some were "16" ( these are Holley not weber #'s)


#5 was a Holley and had 135/140 mains and 170 /195 air jets and an " 05 " and a "16" for air tubes...I have no Idea what engine this was on but the carb was on a type 3 style manifold/ runners

#6 was a Holley and was so crudded up inside I could not tell the #'s on anything but the mains and they were 137/140

This may or may not help anybody but it was a fun way to pass some time this evening!

[drv]

Hello all, I recently purchased a 1973 Bus with a single progressive carb. I ended up swapping it out for a weber single progressive carb. I wanted to know what is the correct valve clearance for a 1700cc engine with a single progressive carb. I read in the bentley book .15 for single carb and then in the note it says .20mm for 1973 models. This is my first bus and first time working on this engine and trying to tune it better than it currently is.

Many thanks