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ducatipaso.org :: View topic - Wanted: pictures of your Weber carb
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Wanted: pictures of your Weber carb
http://ducatipaso.org/forum/viewtopic.php?f=1&t=8037		 Page 1 of 2
Author:  paso750 [ Wed Nov 21, 2018 3:19 pm ]
Post subject:  Wanted: pictures of your Weber carb
There are the following:

P750 - 44DCNF 107
P750 - 44DCNF 110 (US)
P906 - 44DCNF 113
750S - 44DCNF 116 (according to some Ducati books it's a 113 so maybe like on the Paso there were different versions depending on target country)
900SS - 44DCNF 118 (-"-)

The question came up recently (again) what the differences are. I personally doubt it's just the jetting. Instead I think the difference could be the number and size of the progression holes. To see the progression holes you'll have to turn the Weber upside down and open the throttle valve. The pictures below show a 44DCNF 110. It would be great if you have one of the other models and could post a picture for comparison. I will post this in three forums although I don't like double posts. When I get some replys all info will be joined into one topic and the other two will be deleted.

thanks,

G.

Attachments:
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Author:  Frank.61 [ Thu Dec 27, 2018 1:04 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Hi Gerhard,

I will send a picture of my 44 dcnf 107 progression holes the first occasion I have it disassembled.
But I have also a 44 dcnf 112 (7M) version (= 750 USA version) I obtained it as a spare one for easy/quick exchange during tuning activities (later on in the process).

Just to let you know there seems to be also a "112" version.

If you want me to pass other info just let me know (e.g. jets etc.).

Regards,

Frank
Author:  Frank.61 [ Thu Dec 27, 2018 1:36 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Gerhard,

Here the progression holes pic from the 44 dcnf 112.
This one has 5 holes.

Ciao,

Frank

Attachments:
File comment: Weber 44 DCNF 112 7M - progression holes
rsz_20181227_143111.jpg
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Author:  paso750 [ Tue Jan 08, 2019 6:31 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Author:  Frank.61 [ Tue Jan 08, 2019 7:01 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Hi Gerhard,

Best wishes, just looked at my 44 DCNF 107 and it has 4 progression holes :dunno: .
As soon as it of the Paso I'll send you a picture.

Regards,

Frank
Author:  paso750 [ Tue Jan 08, 2019 7:05 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Interesting. Then they are probably smaller than the ones in the 110.
Author:  Frank.61 [ Wed Jan 09, 2019 8:44 am ]
Post subject:  Re: Wanted: pictures of your Weber carb
Yeh,, it's a small crack, previous owner will have over torqued the adjuster screws.
Not a big deal, just for synchronizing.
Author:  Frank.61 [ Wed Jan 09, 2019 9:00 am ]
Post subject:  Re: Wanted: pictures of your Weber carb
Sorry, slip of the tongue: idle mixture .... :oops:
Author:  Frank.61 [ Wed Jan 09, 2019 9:57 am ]
Post subject:  Re: Wanted: pictures of your Weber carb
Gerhard,

I will try to measure the holes in the near future (will use the rear of small calibrated drill bits).
By the eye the lowest one is always smaller than the rest.
But I will check it for the 107 & 112.

Frank
Author:  Mc tool [ Wed Jan 09, 2019 11:14 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Whats the diff ?
Is it the actual number of holes , the combined area of the holes or the length of the series of holes ( like how far the throttle plate is open before the last hole is completely uncovered. Maybe you could convert a 3 hole or 4 hole into a 5 hole by "lengthening " the last hole ..............just thinkin :evil: :P
Author:  paso750 [ Sun Jan 13, 2019 4:02 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Author:  higgy [ Sun Jan 13, 2019 5:56 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Author:  paso750 [ Sun Jan 13, 2019 6:16 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
I agree that the progression phase will be narrower but why would it be richer?
Author:  higgy [ Sun Jan 13, 2019 9:01 pm ]
Post subject:  Re: Wanted: pictures of your Weber carb
Stronger signal will pull more fuel. Higher pressure in the float chamber pushes more fuel into the low pressure of the venturi if that makes more sense
Author:  Frank.61 [ Mon Jan 14, 2019 9:43 am ]
Post subject:  Re: Wanted: pictures of your Weber carb
Gerhard,

I had the same question, to be honest I would rather assume the other way around ... ( more holes = more surface = less resistance = more fuel mixture from the idle circuit).

Just saying: I want to believe the remark but I don't understand it (I'm not a Weber specialist just an interested bystander).

Frank
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