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Flooding Issues

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Smiley Veteran Volks Folk

2,125 posts · joined Oct 2008 ·

#818348
Hi all

I was out offroading a week or two back in a local spot called "The Playground" and there are quite a few large hills here. I couldn't drive up any of them cause the car starts flooding and stalls out.

Engine is 1300 singleport with a 30 PICT-3 Carby.

Carby is tuned as best as I can get it and drives great on and offroad, it's just the hills.

I've just been outside checking the float bowl level and it is spot on.

Here's a few pictures of the carby.








One thing I did notice when I was faffing about that the autochoke butterfly can move when the throttle is applied slightly. I don't have the autochoke connected at all. And it is rotated in the housing so it doesn't move the choke butterfly if it's hot or cold. I've never had any trouble with the car in Winter, just have to baby it a little after startup (which I'm happy to do). I tried to connect it once and the car ran crap so I put it back how it was.

Back to the hills issue.

In the next picture imagine that we are driving up a big hill (picture tilted for your viewing pleasure 😂 )
The accelerator is being applied so the throttle is not holding the fast idle cam back. What I think might be happening at this point is the autochoke butterfly is 'falling' backwards and shutting off the air supply, flooding the engine.





Do people think this might be the problem?

If so can I wire the autochoke butterfly in the upright position to stop it happening?

Can I remove the butterfly completely or will this be detrimental to the carby's operation?

If this is not the problem can anyone suggest what might be?


Any and all suggestions welcome!

Thanks in advance



Smiley 😎
If you said I was a Volkswagen man, you'd be right.

vwjon Fahrvergnugen

914 posts · joined Jul 2006 ·

#818364
the problem is the over flow pipe, thats the big brass pipe in the center of the throat pointing up. put a piece of petrol pipe on that and lengthen that pipe by about 50mm, problems should stop
as far as the choke goes, loosen the three screws on the opposite side to the pic, and turn it clock wise about 20* this will back off the choke. but i think its an over flow issue!
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Smiley Veteran Volks Folk

2,125 posts · joined Oct 2008 ·

#818368
vwjon wrote:the problem is the over flow pipe, thats the big brass pipe in the center of the throat pointing up. put a piece of petrol pipe on that and lengthen that pipe by about 50mm, problems should stop
as far as the choke goes, loosen the three screws on the opposite side to the pic, and turn it clock wise about 20* this will back off the choke. but i think its an over flow issue!
I already have this mod. It did make some improvement when we did it. But the problem is still there.
That's why I think it is the air being cut off.

And the choke is already backed off too.

Smiley 😎
If you said I was a Volkswagen man, you'd be right.

68AutoBug Beetle Restorer - Experience over 138\% - YIKES --

11,654 posts · joined Aug 2002 ·

#818373
having the choke flap moving about freely is not good...

undo the 3 screws on the autochoke..
slide the round piece so the choke flap is vertical..

tighten the 3 screws up...

now the flap should always be vertical...
and the flap will be spring loaded too....

cheers

LEE
- Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY---

Sides Veteran Volks Folk

2,220 posts · joined May 2007 ·

#818395
Yeah, what Lee has said... or better yet, hook it up to work as it should.

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Smiley Veteran Volks Folk

2,125 posts · joined Oct 2008 ·

#818396
68AutoBug wrote:having the choke flap moving about freely is not good...

undo the 3 screws on the autochoke..
slide the round piece so the choke flap is vertical..

tighten the 3 screws up...

now the flap should always be vertical...
and the flap will be spring loaded too....

cheers

LEE
Have just done this. Will try and get out and test it over the next day or so and get back to you all. Is there anything else that can cause flooding on steep hills??


Sides - I have no use for it. The car runs fine in Winter because it rarely gets below 10°C in Yeppoon of a morning when I have to leave for work. I would consider it if I moved somewhere that was actually cold, like Victoria.

Thanks for your input gents!!


Smiley 😎
If you said I was a Volkswagen man, you'd be right.

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 ·

#818398
A problem that jumps out at me but isnt actually to do with your flooding is the throttle stop setting

On Pict-3 carbs like yours the throttle stop screw isnt an idle adjustment, It's only there to keep the throttle plate from jamming shut, but people wound them in to bump up the idle like on yours not knowing which leads to hesitations on accelaration

Couldn't tell you how many times I've fixed this problem on bugs and kombis over the years but used to see it all the time.

The big bypass screw on the side of the float chamber is the actual Idle speed adjustment.
The throttle stop screw should be wound all the way out till its not touching the fast idle cam then in till it just touches and 1/4 turn more. thats were they're meant to be set and left so the progression ports in the throat do there thing as the throttle is cracked open.

When they're wound in like yours the throttle plate is already open passed the progression ports so it doesn't get that extra fuel on opening the throttle

Idle adjustment is set using the mixture screw and bypass screw on the side.

Sides Veteran Volks Folk

2,220 posts · joined May 2007 ·

#818422
Yeah, got ya Smiley - I'm just in the camp of leaving the auto choke connected can't hurt.

Good spot too Joel... I hadn't noticed it, but that's a LOT of throttle stop screw !!!

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Join a car club - get car peeps

My toys
'70 Hillclimb Bug 'Jezebel' w/- Haltech EFI - http://bit.ly/VwTNtQ
'60 KG Coupe - resto kinda started
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Smiley Veteran Volks Folk

2,125 posts · joined Oct 2008 ·

#818425
Sides wrote:Yeah, got ya Smiley - I'm just in the camp of leaving the auto choke connected can't hurt.

Good spot too Joel... I hadn't noticed it, but that's a LOT of throttle stop screw !!!

😎
hahahahaha Maybe I need to learn how to tune a carby.

Going out to have a play with it now.


Smiley 😎
If you said I was a Volkswagen man, you'd be right.

Smiley Veteran Volks Folk

2,125 posts · joined Oct 2008 ·

#818429
Joel wrote:The throttle stop screw should be wound all the way out till its not touching the fast idle cam then in till it just touches and 1/4 turn more.

This is exactly how it is set. I didn't think I'd made such a drastic mistake when I last tuned her.

It may look like a lot of threads sticking out the back on the adjuster, but it's about double that again on the front. It might just look like alot seeing as it's a very close up picture.

Thanks for your input Joel, made me go and double check and it's good to know it's tuned correctly.


Smiley 😎
If you said I was a Volkswagen man, you'd be right.

greedy53 Bishop of Volkswagenism

3,062 posts · joined Mar 2006 ·

#818515
reset then screws to the normal by screwing them in all the way gently then screw them out the big fat 1 is 1.5 turns from the in position and the small is 2.5 from base
this may fix it also turn the idel butterfly screw out until its of the stopper than turn in 2 turns
also the float may be to high
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