Bigkiltedwarrior
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| posted on 13/2/15 at 07:00 PM |
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Weber 45 tuning
Hi,
Following fitting a Burton stage 2 big valve head and Kent FR30 hi-torque cam to my 2 litre pinto already on Weber twin 45s, I have finally fired her
up and have her idling nicely with the idle speed screw in about half a turn after contact with the throttle lever and the idle mixture screws out 2
turns from gently seated. RPM is sitting at about 1100. I have 12 degrees of advance BTDC.
Chokes are 36
Main jets are 145
Emulsion tubes F16
Air corrector 155 (180s on order)
Idle jet 55F6 (55F9 on order)
Pump jet 45
She seems to die a fair bit on rapid throttle whilst not under load. I haven't taken her out yet for a spin.
Anyone see anything obviously needing adjusted?
Cheers
Stewart
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coozer
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| posted on 13/2/15 at 07:11 PM |
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They are a pain in the arse to keep balanced and in tune.
Sell them on, buy some bike carbs and have a nice holiday!
1972 V8 Jago
1980 Z750
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Bigkiltedwarrior
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| posted on 13/2/15 at 07:16 PM |
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hi Coozer, thanks but I like my Webers and they were running great on the old setup. More than happy to persevere fiddling with them as its all part
of the joy of owning one of these.
S
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cliftyhanger
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| posted on 13/2/15 at 07:25 PM |
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Have you asked Burton? they may well have specs they can supply. But ideally a session on the rollers.
I still do not understand why so many people have issues with keeping twin chokes in tune. My dellortos were really reliable once set up, and would
return 35mpg on a zetec. It is only a few things that could go out (balance, idle screws etc) but should be fine unless fiddled with??
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perksy
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| posted on 13/2/15 at 07:57 PM |
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Dave Andrews's Weber jetting program is usually not a million miles away and is worth using.
I had a 2 litre zetec on 45's and using Dave's program it wasn't far off when visiting NMS for final set up.
Nowt wrong with with a pair of well set-up Webers, Their old school 
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Angel Acevedo
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| posted on 13/2/15 at 11:26 PM |
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Aarrrgghhh...
Here we go again...
I think 1100 RPM is a little bit too high.
First adjust Idle Speed screw to provide Idle slow, but enough not to stall engine.
Then adjust Idle Mixture Screws so speed increases, this a quarter of a turn to half a turn at a time....
Whenever Idle speed increases, bring back with Idle Speed adjustment screw...
Keep doing so until you have reached a point where no increase in Idle speed is noted and back off a little Idle Mixture Screws.
Adjust Idle Speed Screw.
Something else may be the Enrichment Pump Cam adjustment. (I don´t remember if these carbs have them,
I have a Weber manual near by if you want me to review what I wrote above...
HTH
AA
ETA: You may want to use a Carb balancing tool to get the best results......
[Edited on 2/13/2015 by Angel Acevedo]
Beware of what you wish.. for it may come true....
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BaileyPerformance
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| posted on 14/2/15 at 06:28 AM |
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F16, main and corrector not far off, (the ones you ordered)55F9 maybe abit big, 45/50F9 mite be closer.
Where in the world are you?
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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jollygreengiant
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| posted on 14/2/15 at 06:40 AM |
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quote:
Originally posted by BaileyPerformance
F16, main and corrector not far off, (the ones you ordered)55F9 maybe abit big, 45/50F9 mite be closer.
Where in the world are you?
Possibly Scotland judging by the username. 
Beware of the Goldfish in the tulip mines. The ONLY defence against them is smoking peanut butter sandwiches.
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Bigkiltedwarrior
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| posted on 14/2/15 at 03:31 PM |
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jersey, Channel Islands. Originally Aberdeen
Productive day today in garage and have got it running pretty good with no hesitation or backfire through exhaust or carbs. Idle speed screw out half
a turn, idle mixture out 3 turns (45 152s) and timing advanced about 16-18 btdc at 1000.
Drives very well and should do me until I can get to a garage to balance fully or a RR over in the UK.
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Paul Turner
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| posted on 14/2/15 at 05:56 PM |
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quote:
Originally posted by coozer
They are a pain in the arse to keep balanced and in tune.
No they are not.
OK, they do go out of balance eventually but I bought one of these
http://www.ebay.co.uk/itm/like/290682796527?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&chn=ps&device=c&
;adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108 many years ago and simply checked and adjusted as
necessary, probably a couple of times a year. Still use it to check the Jenveys.
If they are jetted correctly for your engine tune they will not require tuning again. The only moving parts are the needle jets and floats which will
eventually need replacing but in 15 years of Webers I did it once.
Problem with Webers there are many "specialists" out there who know fek all, all they know is how to fek them up. Find a good tuner and
they are basically fit and forget.
The other problem is the Webers available on e-bay, most are sold because they are knackered or off old cars such as Alfas etc with fixed jets. They
are cheap for a reason.
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Andy D
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| posted on 14/2/15 at 07:06 PM |
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quote:
Originally posted by Paul Turner
quote:
Originally posted by coozer
They are a pain in the arse to keep balanced and in tune.
No they are not.
OK, they do go out of balance eventually but I bought one of these
http://www.ebay.co.uk/itm/like/290682796527?limghlpsr=true&hlpv=2&ops=true&viphx=1&hlpht=true&lpid=108&chn=ps&device=c&
;adtype=pla&crdt=0&ff3=1&ff11=ICEP3.0.0-L&ff12=67&ff13=80&ff14=108 many years ago and simply checked and adjusted as
necessary, probably a couple of times a year. Still use it to check the Jenveys.
If they are jetted correctly for your engine tune they will not require tuning again. The only moving parts are the needle jets and floats which will
eventually need replacing but in 15 years of Webers I did it once.
Problem with Webers there are many "specialists" out there who know fek all, all they know is how to fek them up. Find a good tuner and
they are basically fit and forget.
The other problem is the Webers available on e-bay, most are sold because they are knackered or off old cars such as Alfas etc with fixed jets. They
are cheap for a reason.
+1 Couldn't agree more. I get mine set up by Ron Harper, (near Middlesbrough) proper old school. I occasionally put the ballancer on them, but
it's just more of a check than anything.. properly set up they do not go "out of tune".
As said, I think the problem is these old guys are retiring, and their knowledge is dissapearing.. 
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Angel Acevedo
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| posted on 14/2/15 at 09:01 PM |
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Bigkiltedwarrior
Good to hear you´re sorted.
The aaarrgghhh at the beginning of my post is due to my connection crashing when I pressed the reply button.
And believe it or not happened again replying to this.
I will revert back to editing my (almost nil) posts in woed so I don´t lose whatever I have written.
Best regards
Angel Acevedo
Beware of what you wish.. for it may come true....
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