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Location:
Finland
Registered:
June 2002
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Re: Weber jets on a TA22
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Wed, 05 February 2003 16:00
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I have no experience with Weber downdraughts. Dellortos yes.
Some downdraught Dell's are 'exhaust emission' models, thus having _fixed_ idle circuitry air bleed (size is 2mm in dia). This is not good. In side draughts same bleed jets are changeable, except models 40H and -F. It makes engines run real lean in low rpm's.
To correct the situation we need to use any means we can come up with to alter air bleed aperature size. I chose to drill & tap said fixed inlets. I manufactured a set of airbleeds in 0,1mm increments ranging from 1,2mm's to 1,9mm's. (I found just perfect allen-key screws from toolshop, only had to drill a hole through 'em and voila!).
So basically yes - fixed aperature carburators can be finicky in idle jet circuitry performance in stock trim.
When DIY altered, they are as freely jetted as their sidedraught counterparts.
BTW, it pays off to go thru carbies in grate detail. For example in my pair the darn butterflies were miles off center. That'll definately scew up progression phase fuel distribution, idle as well.
Fuel levels needed some tweaking as well to get back to OEM manufacturer's manual recommendations.
One more detail: clean, clean clean. Carbies won't tolerate any muck. Install proper fuel line filtering, air filter too.
All in all, so many small little details can be outta order in carbies to make them perfrom badly. There's no other way to make sure what we have unless we take them completely apart.
-A.
[Updated on: Wed, 05 February 2003 16:10]
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| | Subject | Poster | Date |
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Weber jets on a TA22
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roadrunner | Tue, 04 February 2003 08:11 |
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Re: Weber jets on a TA22
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Super Jamie | Wed, 05 February 2003 14:28 |
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Re: Weber jets on a TA22
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5KinKP60 | Wed, 05 February 2003 16:00 |
