| [ Total Views: 773 | Total Replies: 10 | Thread Id: 87796 ] |
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 Smiley
A.k.a.: Daniel Stephens
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| posted on December 25th, 2010 at 06:35 PM |
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Flooding Issues
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.
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vwjon
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| posted on December 25th, 2010 at 09:29 PM |
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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
A.k.a.: Daniel Stephens
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| posted on December 25th, 2010 at 10:10 PM |
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| Quote: | Originally
posted by vwjon
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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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.
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68AutoBug
A.k.a.: Lee Noonan
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 posted on December 26th, 2010 at 12:57 AM |
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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
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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Sides
A.k.a.: Dave Sidery
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| posted on December 26th, 2010 at 09:48 AM |
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Yeah, what Lee has said... or better yet, hook it up to work as it should.
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Smiley
A.k.a.: Daniel Stephens
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| posted on December 26th, 2010 at 09:57 AM |
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| Quote: | Originally
posted by 68AutoBug
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
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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
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Joel
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| posted on December 26th, 2010 at 10:36 AM |
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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.
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Sides
A.k.a.: Dave Sidery
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| posted on December 26th, 2010 at 04:06 PM |
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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
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Smiley
A.k.a.: Daniel Stephens
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| posted on December 26th, 2010 at 04:13 PM |
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| Quote: | Originally
posted by Sides
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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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.
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Smiley
A.k.a.: Daniel Stephens
Veteran Volks Folk
Posts: 2125
Threads: 110
Registered: October 29th, 2008
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Location: Yeppoon, Central Queensland
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| posted on December 26th, 2010 at 04:49 PM |
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| Quote: | Originally
posted by Joel
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.
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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
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greedy53
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| posted on December 27th, 2010 at 01:43 PM |
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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
happy dubbing
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