Single Weber 45 on a 2.0 Pinto

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Greensleaves
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Joined: 2012-02-19

 

I am new to forums, and i have a problem ....
I have had a single 45 weber on a lynx manifold for quite sometime now all bought from new, fitting it to a 2.0 Pinto engine in my Mk3 Cortina.
I have been experimenting with jettings for ages and ages and i have come close to getting it right when the engine is warm, but starting from cold it runs like abag of nails and im getting petrol running out of the barrels.
I think the problem lies qith the float settings, idle jets and/or needle valve ?
Does anyone have any cloe of a Base setting for a single 45 on 2.0 Pinto .... there is plenty of advice for dual carbs but Nothinig for single use, i have des hamills book and david vizard but neither go into great detail on float settings.
I'm at a loss, someone please help me.
Thanks for your time,
Dan

Oh current settings are 
Idle jets that have worked in the past but not quite right
F2 65
F11 65
F8 65
F9 65
I think i'm right with the 65 as decreasing makes idle even worse.

Needle valve 200
Float shut off - 14mm (but have tried 7.5mm through to 15mm
Float droop - 26mm

Em tube F16
45 Aux Venturi
36 Chokes
50 Pump valve

As for mains and air corrector i cant remember what they are but i figure they are ok as the problems lie within the idling section?

Henryk
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Joined: 2011-06-02

 Hi G.S first i think a single 45 is a waist of time you dont mention what type of fuel pump/presure any way you could try these settings....................choke 33 air170 e/tube f16 main 145 idle 40 orr45 good luck regards Henryk   

Greensleaves
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Joined: 2012-02-19

Thanks Henryk, i will try these settings .... i think theres a problem with my float level and/or needle valve setting, What F number would you put with the idle jets? and why do you think a single 45 is a waste of time?

rolymo35
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Joined: 2011-06-02

   It is possible to obtain a tech-manual which will explain everything in detail . I managed to loan one from my local liberary but  that all depends on where you are located, some areas are a bit disorganisd at the present time due to Gov't cuts. You can buy direct from Haynes Manuals (part no 10240) price £19-99 .. That will take care of the settings & adjustments, as regards tuning David Vizard would advise you to take your car to a good rolling road service for an accurate jet- setting ( Test work not guess work)  Try ringing a few rollers for a quotation  and please let us know what results you achieve.

RolyMo

rolymo35
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Joined: 2011-06-02

This is a very similar instalation on 1900cc MGB and  I have fitted dozens of these in the past with great results, if they are set up  properly they can be a blessing, The rolling -road set up will allow for different camshaft characturistics and variables that you cannot access by rule of thumb guesswork methods ,stick with it and have some fun !!( cannot get photo to print at the mo , will try again tomorrow its midnight)

RolyMo

rolymo35
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Joined: 2011-06-02

test Weber45 photo ?

RolyMo

Henryk
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Joined: 2011-06-02

 Hi again G S some time ago i ran a swift FF 2000. with the regulation 28/36 weber with good results we moved on to sprints/hillclimbs then looking for more power tryed a single 40 but then twin 40s The pinto cyl/head was a bit of a hit and miss when it came to gas flowing choke sizes can also go one way or an other bigger chokes dont mean more power if i can find my old notes and anything that might help i will post them regards Henryk.

Greensleaves
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Joined: 2012-02-19

I managed to obtain a copy of the weber Haynes tech manual .... It had the basic setting I needed to get going .... It's now running much much better. I agree I need to take it to a rolling road to fine tune it but I can't grumble at the moment.
The settings I've got now are
36 chokes
145 mains
200 air corrector
65F8 idle jet
F2 emulsion tube
Float 6.5 closed 14 open (according to book)
200 needle valve

I'm waiting on some 34 chokes so going to try those and alter my other setting to see if that makes any difference
Thanks for everyones advice it has helped.

Slidingpillar
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Joined: 2011-12-16

Before altering anything, are you running a fuel pressure regulator?

Simptoms you give are very much like the float valve is being overcome and consequently flooding. Both Webber and Delorto side intake carburettors are prone to this problem. 3.5 psi is plenty.