Hello Panda peeps and visitors etc...

well i sourced a carb from a Punto Selecta that was on ebay. should be from a 1108cc engine i think. It's a progressive carb (meaning that the butterfly/jets/venturi are controlled slightly differently from each other) and i intend to fit it to the car i have 999cc for the time being, but i'll be keeping an eye out for a low milage 1108cc engine through the year.

OK the question is, what are the benefits of both forms of carb?... I have heard said on the forum that progressive carbs are better for maintaining power from low to high revs and for fuel economy as it adjusts to match what requested. So does this mean that the synchronus dcnf40 that i have is rubbish...?

I just thought I would throw this one out there before i started developing the custom manifold for the weber i choose (although the carb mounting holes looks near identical at that end) to mount on the car.

All informed opinions welcome.

That's a very good question Tony

couldn't have been from a punto. they never done a carb version

Alex-R said:

couldn't have been from a punto. they never done a carb version

Click to expand...

Sorry you're right... it was from the 1096cc (? i forgot the exact capacity) pushrod UNO60 selecta... if anyone knows the exact model it'll save me a trip down to look at the carb to check. DTMR maybe... just trying to find online refence to the carb... as the tubes are in different positions to the ICT on the panda FIRE engines.

Tony M said:

Sorry you're right... it was from the 1096cc (? i forgot the exact capacity) pushrod UNO60 selecta... if anyone knows the exact model it'll save me a trip down to look at the carb to check. DTMR maybe... just trying to find online refence to the carb... as the tubes are in different positions to the ICT on the panda FIRE engines.

Click to expand...

Uno 60 Selecta used the older 1116cc engine. It's also ohc and not pushrod

I don't know the spec of the carb I'm afraid as my manuals don't cover the Selecta models. However, the twin choke carbs fitted to the other 1116cc models were as follows:

1: Weber 30/32 DMTE 30/150
2: Weber 30/32 DMTE 10/150
3: Solex C 30/32 CIC8

I would have thought that the Selecta carb is a variation of one of the above?

Synchronised twin choke carbs are better for engines that spend most of their time revving at the upper end of the rev range i.e. a race engine. For a road going car a progressive twin choke carb will make the engine much more driveable and will still give you the advantage of double chokes at approx. 60 to 100% throttle openings.

As has already been mentioned, progressive chokes will allow you better fuel economy and better low down torque. The sychronised twin choke carb will probably run rough below about 2500rpm as it is more likely to overfuel.

What happens with a progressive twin choke is that for approx. the first 50% of throttle openings only the first choke operates (effectively making it a single choke carburetor) until it is fully open at around 50%. Beyond 50% (ish) throttle openings the second choke starts to open as well, until that too is fully open at 100% WOT (Wide Open Throttle).

The sychronised twin choke carb will open both throttles simultaneously, and as it always uses two chokes together it will allow a greater amount of air/ fuel mixture through compared with the progressive carb. At higher revs this gives a greater engine response, but at lower revs and idle the engine won't be happy as it prefers a more restrictive air/ fuel mixture to maintain torque and smooth idling.

The progressive twin choke carb will therefore be better for a road engine, and the synchronised twin choke better for a racing engine.

Hope this helps!

yeah i think that just about covers it... So the DTME carb will be going on without much doubt and the other carb will be going onto Ebay as i haven't got a use for it anymore...

i'm really confused!!!! Will that Carb bolt straight onto a Panda Manifold?
Do you need any extra cables etc.?

Sprox said:

i'm really confused!!!! Will that Carb bolt straight onto a Panda Manifold?
Do you need any extra cables etc.?

Click to expand...

you will need a manifold convertor mount... which replaces the spacer that is normally underneath the carb.

depending on the carb chosen you'll need to alter the throttle and choke cables... maybe change the fuel line. basically the carb has the same stuff as the panda one, it's just a matter of connecting it up. unfortunately the carb that is on the panda is pretty limiting in terms of straight swaps... and the ones that would fit are probably less effective than the standard one.

the manifold for the Uno that this came from uses the older manifold stud pattern so i can't swap the inlet manifold over from a panda 45 for example.

the manifold convertor is probably the cheapest route to take.

I will be putting an Uno or Panda 4x4 inlet manifold on Red to drive his soon to be fitted brake servo. . . . .

...and where do you get manifold convertor mounts?

Sprox said:

...and where do you get manifold convertor mounts?

Click to expand...

you go to a engineering/fabrication firm and ask them to make you one... or anyone that has a CNC milling machine... i don't think they exist as stock for this particular job Graham... the market is too small.

here's a detailed but in no way accurate schematic i knocked together since i saw your last post...