| [ Total Views: 654 | Total Replies: 19 | Thread Id: 5659 ] |
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 kombi_kid
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| posted on April 26th, 2003 at 10:56 AM |
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what jets?
hey i have a flat spot in my kombi 1600 its just off idle when u put ur foot to the floor i read in a zeitschrift mag that its usually the jets so
what should i upgrade to its a 34 PICT-3 carby (doesnt look like its a solex carby)
cheers
rhys
p.s. bloody rain ill check what brand it is when it stops
it aint just cool its aircool'd
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 type82e
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| posted on April 26th, 2003 at 11:12 AM |
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hi rhys
when I drove it to brisbane it did that as well yoiu had to play with the throttle to get it going not sure what the problem was once it picked up
some revs it was fine and cruised all the way up there just on take off
marcel
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kombi_kid
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| posted on April 26th, 2003 at 04:20 PM |
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hey
yer i know (quick little drive up and down the rear lane  )
got the 2L running today ripper of an engine!
cheers
rhys
it aint just cool its aircool'd
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Bizarre
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| posted on April 26th, 2003 at 08:30 PM |
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More info Rhys
What sort of motor T1 or 4
What carbs?
009? - notorious for flat spots when combined with 34's
What is the throttle bush like?
If it is loose it will suck air like Madonna on a ......
There are several answers.... more info please:bounce
Futue te ipsum!!!
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type82e
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| posted on April 26th, 2003 at 08:46 PM |
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its a 1600 tport running pict 34 (looks pretty new) and standard distributor
marcel
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Bizarre
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| posted on April 26th, 2003 at 08:55 PM |
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Then i would be looking for a vac leak somewhere.
What condition are the manifold boots in?
How good is the 34 Pict? - no leaks at the throttle shaft?
Futue te ipsum!!!
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The_Bronze.
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| posted on April 26th, 2003 at 11:12 PM |
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Pict Probs
I have a 34 PICT as well Rhys and have had endless problems with it. It wasn't only the carb but mant probs in combination. I couldn't get
it to idle - turned out it was the idle screw ruber o-ring jammed throughout the throttle body. Apparently mine has a 1500 dizzy (Vac adv) which
isn't the best for the 34 and better for a 30. The 009 is the prefered for the 34.
I hope you have better luck than I with your flat spot. I haven't had a flat spot yet but give it time - it's running out of things to sh!t
me with.
[size=4]Bronze.[/size]
Rathmines, Lake Macquarie, NSW.
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70AutoStik
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| posted on April 27th, 2003 at 12:00 AM |
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A larger idle jet will be the obvious answer if you don't have a vacuum leak - it can also help to cover the flat spot caused by a 009 if
that's what you have. If so, you're still gonna have to get used to driving it hard: that's what 009s are for.
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kombi_kid
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| posted on April 27th, 2003 at 07:40 PM |
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standard vac advanced dizzy, no vacuum leaks etc, how many tuerns do u take out the fuel mix? and any other carby tuning turns? give here a tune up
and see how she goes!, anyway i just bought myself some kads for it 
cheers
rhys
it aint just cool its aircool'd
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aussiebug
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| posted on April 28th, 2003 at 01:29 PM |
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You said the carby looked new - that will almost certainly make it a Brosol (Brazilian Solex) 34PICT/3.
These are usually delivered with lean jetting (an emissions thing) making them hard to tune, and since you have a heavy-bodied bus, that changes
things a little too.
For a bus with 1600 and vacuum distributor, you need a 65 idle (55 for a beetle), 127.5 main jet and about a 60 air correction jet.
I presume the vacuum distributor is in fact "stock" and is the Single Vac Double Advance (SVDA) type? With a smallish vacuum canister on
the side?
I mention this because the earlier single vac (vac only) distributors were used on 68-69 kombis but had a larger vacuum cainster which matched the
30PICT/2 carbies they used. The vac canister size must match the carby size (large vac for the smaller carbs and smaller vac for the 34) or you get
an incorrect advance signal, and so you either get a flat spot (insufficient advance) or pinging (to much advance) as you open the throttle.
Since you've now bought yourself some Kads, what are you doing with the near new 34 - does it need a new home (pleeeease :-)
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kombi_kid
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| posted on April 28th, 2003 at 02:33 PM |
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yer prolly will need a new home ill give u a definate answer when i get
the kads and make a decision!
cheers
rhys
p.s. will kads work with the advanced dissy?
it aint just cool its aircool'd
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Bizarre
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| posted on April 28th, 2003 at 03:03 PM |
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It is "easier" to whack a 009 on
You can tap for a vacuum port on the Kads - but dont ask me where.
Maybe Stan knows or scour the http://www.lowbugget.com site (AJ Sims)
I know he does it. Maybe you could email him?
Futue te ipsum!!!
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amazer
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| posted on April 28th, 2003 at 03:21 PM |
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you need to tap into both manifolds, run them into a tee to get a good vacuum.
Chris.... kombi pilot, oval dreamer... finisher #26971 2005 city to surf
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aussiebug
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| posted on April 28th, 2003 at 03:44 PM |
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| Quote: | Originally
posted by kombi_kid
yer prolly will need a new home ill give u a definate answer when i get
the kads and make a decision!
cheers
rhys
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Thanks Rhys.
| Quote: |
p.s. will kads work with the advanced dissy?
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Yes - as amazer says, the kads (usually the left one) can be tapped for a vacuum signal.
Visit http://www.aircooled.net and look at the tech articles - I think John (the
owner of that business) has an article on Kads and vacuum.
He can also set up vacuum distributors with the right vacuum can for the engine size and carburettor choice too - he rebuilds distributors to "as
new" standards as part of his business (and he knows HEAPS about VWs).
[Edited on 28-4-2003 by aussiebug]
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70AutoStik
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| posted on April 29th, 2003 at 08:57 PM |
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As to where you tap the kads, it's just above the throttle plate at the closed position (you don't want the vacuum advance at idle.) A look
at the pozzie on your stocker to give you an idea; you'll see a 1mm hole about 1mm above the closed position of the plate, offset from the
idle/progression holes (it should not be above/ below any of them.) Many run a single line (from a single carb,) some run ports on both - you should
only need the two if you have a fairly lumpy cam.
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amazer
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| posted on April 29th, 2003 at 09:54 PM |
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Back in the 70's when VW went to twin carbs on a type 4 they tapped into the manifolds of both sides for the vaccum signal. Good enough for
them... good enough for me.
Chris.... kombi pilot, oval dreamer... finisher #26971 2005 city to surf
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jeffh
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| posted on April 30th, 2003 at 08:13 AM |
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The twin Carbs on the type 4 motored Kombi only used a vacc takeoff on the left carb for distributor advance
the larger connection on each manifold is for the brake booster
Jeff
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aussiebug
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| posted on April 30th, 2003 at 10:52 AM |
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Amazer,
Jeff's right - you can't take a distributor vacuum signal from the inlet manifold - that puts it UNDER the throttle plate so you get full
advance with the throttle shut and almost no advance with the throttle wide open. It has to be above the thottle plate so it relates to the airflow
through the main venturi. That's where it is on all Solex carbs - just under the venturi and above the throttle plate.
And 70Autostick, the idle and transfer ports are on the BOTTOM side of the throttle plate - no where near the vacuum port, which is above the top edge
of the closed throttle plate (which is oval and sits at an angle when closed).
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jboy82
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| posted on April 30th, 2003 at 11:01 AM |
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Sorry to go a bit stray, but does anybody know the difference between 34 pict-3 and 34 pict-4 carbs? I've got one and I notice what looks like an
extra place to put a hose on the side of the carb, but there's no hose on it.
Cheers
Josh.
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Baja Wes
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| posted on April 30th, 2003 at 12:17 PM |
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I think the 34 pict4 is from a golf or something, it has more emmission type crap hanging off it.
Rob, I noticed you said the 34 pict3 is jetting lean on the idle jet, didn't I say that in another thread and you argued it wasn't actually
lean it was just closer to 14.7:1 than the other solexes :P
Anyway, I agree the 34-pict 3 has a leanish idle jet. It works fine with the stock vac dizzy and stock exhaust.
3 things make it cause trouble, a vacuum leak (really leans it out), a 009 and a aftermarket exhaust (also effectively leans it out).
So what exhaust are you running?
I would check what size the idle jet is and then bump it up one size and see how it goes.
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70AutoStik
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| posted on April 30th, 2003 at 11:56 PM |
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Aussiebug, if you have a set of Kads, you'd better have another look (and hold them up the right way this time.)
The 34pict-4 was used on at least the '74 "California" engine (look in your Bentley Manual.) It's the "emissions" carb,
with two vacuum ports (I think the second, retard, port was manifold vacuum - but I'm going off old memories here,) - I'm not sure what
Australian engines they were originally used on, but I have seen one: it would work using the regular vacuum port, but it ran rather lean.
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aussiebug
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| posted on May 1st, 2003 at 01:09 PM |
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70autostick,
Re the idle port positions, I'd switched my thinking to Solex - not kads - my mistake.
And yes - the 34PICT/4 is a California-only carburettor to meet their stringent anti-polution laws.
It runs a little leaner than other forms of the 34PICT and usually has a throttle positioner attached which slows the throttle closing when you lift
off - if I remember right that's what the other vacuum port it for - the throttle positioner does use a vacuum can.
Baja Wes,
Re the "lean idle jet" comment. The original post was about Kombi, not a bug and the type2s usually had a 65 idle jet rather than a 55
(same with the KGs), as the heavier body presumably needed the richer jet to help get it moving. So for THIS application, the 55 idle jet is a little
lean, but would be normal for a bug.
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70AutoStik
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| posted on May 1st, 2003 at 09:08 PM |
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Sorry I was in a bit of a grumpy mood last night, should have thought of the terminology confusion that can arise when the progression ports are
called idle/progression. To anyone else reading, there are possibly two ports below the butterfly, an idle mixture bypass and on some carbs, an air
bypass.
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kombi_kid
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| posted on May 1st, 2003 at 09:35 PM |
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hey wes
its all standard exhaust dizzy etc and there doesnt seen to be a vacuum leak! ill go and grab a spare idle jet from the mechnic and see what
happens!
cheers
rhys
it aint just cool its aircool'd
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