Technical weber 26 carb rebuild / tuning
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Technical weber 26 carb rebuild / tuning
Thomas, you're correct, it is a thick nylon washer and squarish in section.
Hi Peter,
I don't remember any nylon washers being used on Weber carbs fitted to Fiats back in the day. Copper? yes, Aluminium? yes, rubber 'O' rings? yes (depending on location). Are you sure the thick nylon washer is not a later alternative to a rubber 'O' ring, possibly to withstand attack from Ethanol fuel?
I'm not contradicting you, just curious.
Al.
Al, I have never separated the washer but this question has come come up before. I'm away from home so can't check, but it's not metallic or rubber and it's not thick and hard . I'm talking about the 26IMB4.
. I'm talking about the 26IMB4.
I meant to say the washer is quite thick and a hard plastic type material and relatively square in section....this annoying phone types it's own words for me.
I meant to say the washer is quite thick and a hard plastic type material and relatively square in section....this annoying phone types it's own words for me.
Maybe it's a modern version of an old-style fibre washer?
(I forgot to mention the use of fibre washers on carbs in post #43 above.)
Al.
El cargador
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Mine to is most happy with the mixture screw all the way in, if i screw it out,it starts to splutter. I pulled a plug and it's a brownish colour apart from the outer edge which is black.
If I push the accelerator down fast it "coughs" If I ease it down it picks up ok. Do you think this is ok?
If I push the accelerator down fast it "coughs" If I ease it down it picks up ok. Do you think this is ok?
Paul fairall
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Hi, new here, have a weber 26 IMB 10 and want to fit on a ford sidevalve, I've been told it's a much better carb than the standard zenith or solex but needs rejetting to suit the 1172cc engine. Anyone know where I can get spares and jets. As a matter of interest, what is the HP of the fiat 500,
Bigvtwin996
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Well I can boast an eye watering 13bhp.. (on a good day)
I guess some of the BIG BHP boys will be along later....
the hobbler
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Try:---Webcon or Eurocarb or Classic Carbs. All 3 companies can supply parts for the Weber IMB carb. The IMB whilst it is a good basic carb, does NOT have an accelerator pump, which might inhibit acceleration. I think that in your case it is going to be a real 'suck and see' situation. Best of luck!
Paul fairall
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I spoke to a guy at euro carb today and he didn't seem to know much. He only had information specific to model. He did say the technical guy wasn't in today, so when I get the carb I will order a service kit to start and talk to the tech guy.
What size carb came off the engine. I wonder if the 126 Weber 28IMB might be better and tried as standard.
Paul fairall
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Now you tell me, just kidding, I thought that too after I bought a 26. Hadn't looked into it, usual way I go at things. Original carb is 25mm even on a 100e inlet manifold that is 28mm, so yes 28 may well be a better way to do it. What capacity is the 126
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126 capacity is 650cc. There are very few adjustments that you can make on the carb and I am thinking that with a standard carb you will get a standard mixture but with an increased volume flow.
Paul fairall
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You are aware that I'm putting the carb on a ford sidevalve 1172cc.
I read there is a 126 Abarth, I assume that will use a bigger main jet
Yes to the first question and there is no such thing as an Abarth 126 so no idea where you read that. Why do you assume that you need a bigger jet?
Paul fairall
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Just that the engine is twice the capacity, I guess I assume wrong.
Maybe I saw the 500 Abarth, be gentle it's old age setting in.
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Paul you don't have to tell me about old age, 3 hours ago I was sitting in the entrance hall of Harefield Hospital. Just discharged after one planned and one emergency heart operation.
A 500 Abarth would have a larger carb but hard to get and expensive. If you just increase the size of the main jet you are just making the fuel/air mixture richer. So I suggested fitting a standard carb then preferably check the exhaust gasses for the correct fuel burn.
Paul fairall
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Wow, sounds like you've been through it then, I'm very fortunate to have been healthy all my life, just the odd thing or two but nothing as serious.
I guess I'll fit the 26 and see how that works first.
I guess I'll fit the 26 and see how that works first.
Hi Paul , yes it was certainly interesting especially after I experienced what the medical people whispered " he dropped out" after a replacement heart valve opp and equipment failure hence the emergency opp.
If you are going the Weber IMB route then the good news is that the flange drilling is the same for the 26 and the 28 so if you do want a larger carb it will fix straight on. I have a couple of new old stock 126 Weber 28IMB carbs here if you wanted to trade yours up
