weber 40dcoe44/45 venturi removal - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 18 (permalink) Old 09-06-2018, 12:43 AM
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Originally Posted by malcolm1 View Post
I'm glad I came across this thread. I was confused having watched a video featuring DCOE45s that had a different type of fixing underneath for the venturi whichis absent on the DCOE40s

I will take a look mine as I'm going from 30mm to 32mm. The previous owner of mine just carried the 44/45 carbs straight across from the original 1600 engine when he fitted a 2000. I've already upgraded the jets
Hi Malcolm,

It's exactly the same for me: 44/45 carbs on my 2000 GTV instead of 76/77. Did you notice a difference when you rejetted it to standard? what's about 32 venturis?


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post #17 of 18 (permalink) Old 09-06-2018, 04:41 AM
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On reassembly, I use a brass polishing wheel on the contact surfaces (mirror shine) then spray with slip plate graphite coating it dries like paint. It has many uses for automotive resto work $8-10 bucks a can....I even use it to coat cast headers after bead blasting,
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post #18 of 18 (permalink) Old 09-06-2018, 12:06 PM
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I was quite surprised that the previous owner had just carried across the carbs without changing the jets or venturis. I figured that updating the carbs with 32mm venturis and 135 mains would ensure that the power was about right and more importantly that the mixture at full throttle would be safe (i.e. correct degree of richness). 34mm venturis is also an option.

Also, changing the idle jets would mean I get the correct mixture at part load for good driveability and fuel consumption.

I have had some trouble with the engine stumbling at around 2000rpm - when I got it but also after the updates. Running richer jets helps - 55F8 or 50F9, but perhaps that means my carbs need a good clean. More tinkering required.

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