Register Login
Save up to 15% with Adrian Flux insurance!
Reply
 
Thread Tools Search this Thread
Old 01-04-2019   #61
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Yes I might be interested in doing that. Let me get back to you tomorrow.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 26-08-2019   #62
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Maybe not of much interest to others here as its not a fiat 500 but my ford sidevalve has a Weber 26 IMB. With the standard zenith carb it struggled up hills at 20mph. Now it gets up hills at 40mph. Proving my thoughts that the engine struggles to breath. Thinking a 28 might be better with standard jets rather than the 26 with larger jets.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 26-08-2019   #63
Join Date: Jun 2009
Posts: 1,008
Thanks: 85
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Simple answer is nothing, the IMB10 was fitted to the 500L and the IMB6 to the 500F. Same fitting and specification.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Toshi 975 is offline Reply With Quote Quote 
Old 19-09-2019   #64
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Had the weber 26 IMB 10 on my ford sidevalve for some time now and pleased with the performance of it such that it is. But I have a problem starting from cold. Engine fires briefly and dies several times before eventually struggling into life, I have to leave it until it's running a while before opening the throttle or it dies. Turning the idle mixture screw in or out makes no difference to how it runs and may have some bearing on why it struggles to fire up. I'm going to ultrasonically clean the carb again and blow it out with air but if anyone has any suggestions I would appreciate them.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 20-09-2019   #65
Join Date: Jul 2012
Posts: 2,537
Thanks: 196
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

The IMB series of carbs do not have a 'choke', but a 'fuel enrichment device'. The problem could be as simple as what is ample enrichment for a 2 cylinder 500cc engine, is not enough for a 4 cylinder 1172cc engine. The fact that you have to let the engine warm up before you can drive away would seem to support this thought. Adjustment of the idle-mixture screw having no effect on this problem would be another pointer to the fact that cold-start enrichment is not enough. Fitment of the bigger 28IMB MAY improve performance, but the cold-start-warm-up problem will, I suspect, still exist.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

the hobbler is offline Reply With Quote Quote 
Old 20-09-2019   #66
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Appreciate your input. As I was told the 500 is a twin and the ford is a four cylinder and both engines only fire one cylinder at a time. Ok the ford is 293cc per cylinder and the 500 is 249cc I guess so 20% bigger capacity. I did consider the 28 but I adapted the throttle linkage with a part from a solex that connects to the rod operated throttle of the ford and this rotates in front of the idle mixture screw, yes the one that doesn't seem to work. The 28 carbs mixture screw sticks too far and would foul on my throttle linkage.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 25-11-2019   #67
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

May not be of much interest here unless you have a bigger engine or have tuned it. I have a ford sidevalve 1172 with 26 IMB 10, with 130 main jet as the each cylinder is 293cc and the fiat 500 is 249cc. Runs great and gets up hills at 40mph whereas with the standard zenith carb it would struggle at 20mph. But as the weather has got colder it's struggled to fire up and stay running and has taken countless turns to get it to stay running. Starter jet is 90F5 so I searched for a supplier with other size starter jets. I found one in Czech Republic and another in Italy both on eBay. I ordered a 100F5 and 105F5. Fitted the 100F5 and it fired more easily but needed several cranks so fitted the 105F5 and it fires right up and runs great.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 25-11-2019   #68
Join Date: Jul 2011
Posts: 1,041
Thanks: 50
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

I wish there was someone who had nothing better to do than collate all this info....
It is bound to happen in the future that someone has a problem and the solution is lost in the depths of 00s of threads....
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Bigvtwin996 is offline Reply With Quote Quote 
Old 27-11-2019   #69
Join Date: Mar 2019
Posts: 19
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Quote Originally Posted by Bigvtwin996 View Post
I wish there was someone who had nothing better to do than collate all this info....
It is bound to happen in the future that someone has a problem and the solution is lost in the depths of 00s of threads....
it seems the companies selling carbs and parts like eurocarb only go by the standard spec sheets, I guess that's the only thing they can do. As for collating info, that's fine if that info is correct. What I'm finding may not be of use to someone with a fiat 500 and also wrong info can make things more difficult to get a good result. All I can say is the info I gave been given regarding fitting a 26 IMB 10 to a ford sidevalve 1172cc has given a good result and my own choice of starter jet has also worked.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Paul fairall is offline Reply With Quote Quote 
Old 12-06-2020   #70
Join Date: May 2020
Posts: 1
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Hoping someone can help.

My car has a 26 Imb 6 fitted but the car refuses to run without the choke being out. When warm, choke in, car dies. Assume itís something simp,e with adjustments but damned if I can get things any better. Thereís so little that can go wrong but seems beyond me.

Any ideas?

I also have a 26 IMB 4 but canít see any difference between the two. Worth swapping?
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Emro99 is offline Reply With Quote Quote 
Old 12-06-2020   #71
Join Date: Jun 2009
Posts: 1,008
Thanks: 85
Trader Rating: 0
United Kingdom 
Re: weber 26 carb rebuild / tuning

Carbs are completely interchangeable. You may have a blocked slow running jet or poorly adjusted mixture screw. That is assuming the valve clearances and ignition timing are ok.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Toshi 975 is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(G) weber carb info panda racer Panda (Classic) 2 17-03-2017 16:08
(T) Weber Rebuild Giacosa Panda (Classic) 13 11-01-2011 00:01
(T) Weber 28 Carb Dos2 500 (Classic) 2 21-03-2010 12:17
(T) Weber carb INsantiy Tipo (Classic) 9 19-06-2006 13:18