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Weber Carb
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bugsy579
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PostPosted: Wed Jul 21, 2021 1:13 pm    Post subject: Weber Carb Reply with quote

Have a 1966 VW Beetle that had a 1500 engine installed when I bought it. I have had the engine rebuilt and increased to a 1600 DP engine. the rebuild kit came with a Weber carb. Once it is warmed up after 2 or 3 miles it runs strong. But, it runs terrible while it is warming up. It backfires through the exhaust and is embarrassing driving down the road until it is warmed up. Any suggestions to improve the performance until it is warmed up?
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gt1953
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PostPosted: Wed Jul 21, 2021 2:12 pm    Post subject: Re: Weber Carb Reply with quote

What type of weber is it as weber makes a lot of different carbs.
A photo also would be very helpful. This way we could offer suggestions.
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bugsy579
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PostPosted: Thu Jul 22, 2021 7:13 am    Post subject: Re: Weber Carb Reply with quote

Sorry, I should have noted the type of Weber carb. It is a 32/36 2 barrel progressive carb. I have the same carb on my MGB and I had problems on it until I took it to a guy who has worked with Webers on Italian cars for 40 years and it got it adjusted tuned properly by adjusting the float and changing some jets and it runs terrifically. Unfortunately he is no longer available. I don't understand why it runs so bad during warmup and runs great when it is at operating temperature. I wonder if it would be possible to put a manual choke on it and if that may solve the problem. Thanks for any thoughts on the matter.
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Cusser
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PostPosted: Thu Jul 22, 2021 7:32 am    Post subject: Re: Weber Carb Reply with quote

bugsy579 wrote:
It is a 32/36 2 barrel progressive carb.


I have a Weber 32/36 DGEV on my 1988 Mazda truck and it works well (installed 2005). I haven't read too much positive though about using a Weber progressive on a 1600cc VW engine, but have no first-hand experience.

I installed a Weber (likely 32/36) onto a 1975 Chevy Luv and that worked OK, but that was 4 decades ago.

I do run a Weber 40DCNF on my VW 1835cc DP engine, since 1976.

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MrGoodtunes
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PostPosted: Thu Jul 22, 2021 8:50 am    Post subject: Re: Weber Carb Reply with quote

bugsy579 wrote:
... it runs so bad during warmup and runs great when it is at operating temperature ...


This is a typical symptom of insufficient intake manifold pre-heating, e.g. clogged. What type of intake manifold preheat do you have; stock muffler, or an aftermarket muffler with typical piss-poor provisions for intake heating?
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bugsy579
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PostPosted: Thu Jul 22, 2021 9:22 am    Post subject: Re: Weber Carb Reply with quote

I had not thought of that. I do have an aftermarket muffler. Perhaps that is the problem. Thanks for the suggestion. I will check that.
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empi3
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PostPosted: Thu Jul 22, 2021 9:49 am    Post subject: Re: Weber Carb Reply with quote

Good info here Smile

https://www.aircooled.net/making-weber-progressive-dfev-work-aircooled-vw-engine/

Steven
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bugsy579
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PostPosted: Thu Jul 22, 2021 11:45 am    Post subject: Re: Weber Carb Reply with quote

Thanks so much. I have printed it off so I can read through it. Thanks again for the replay and have a great day.

Rod
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