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

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!

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

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

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.

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 !!!

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 !!!

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