Weber DCOE, Part 2B Selecting jets and venturi's

[@albinklein7680]

I am a German certified master mechanic with decades of experience with carbs (sorry for tooting my own horn...) but I enjoyed every bit of that series of videos. Thank you so much!

[@D3Sshooter]

Glad you enjoyed it! always love to hear from experts like you

[@josephfigueroa3527]

Toot that horn, us carb guys are a rare and valuable asset.

[@skippywinters]

I wish teachers at school used the same calm, collected finesse you show in your classes. Thank you for taking the time, amazing Weber rundown!

[@D3Sshooter]

You're very welcome!

[@MrBMWerner]

This is the best video i have ever seen about Weber!!! So much details and i love your drawings on the whiteboard awesome :D

[@D3Sshooter]

Thank you Werner

[@arnyschannel9098]

These videos have been so helpful to me. Thank you for making them and so detailed. I have a 1960 mercedes 190sl with these carbs. cleaned all the jets, bowls etc and the car is running so good now!

[@D3Sshooter]

Glad to help, enjoy your merc

[@bxb590]

Today, I learned so much and I can't say Thank You enough. You really pulled it all together very nicely and the mystery is gone. Take Care and be well. Dave, Niagara Falls.

[@D3Sshooter]

Thanks Dave, I try

[@Uncle-Quinns-Garage]

You're never explaining TOO much. I've learned, in depth, how these carbs work and for that I'm ever thankful.

[@johnridings3291]

Thank you for taking the time to make a very detailed video about the Weber DCOE 40 carburetor. I appreciate the thorough explanation about sizing the different components and feel that it is warranted and not too much of an explanation. I was recording all your sizing as I also have a 2.0l engine that will have a pair of 40’s on it. Thanks again! 👍

Never had a Weber carburetor and I never will, but I really appreciated how much I learned. Not enough to do anything useful, but enough to appreciate how complex and beautifully designed they are. Thank you!

[@D3Sshooter]

Glad to help

[@hondadestiny2587]

Oh, what lovely bird singing in the background. Countryside workshop dream!

[@D3Sshooter]

Yes it is///

[@RadioFixer]

I truly enjoy watching your videos; you explain things so clear and effective that the new person without the background can understand and not get overwhelmed. Thank you so much for taking your valuable time showing us your technique so we can keep our classic cars on the road. Have a great day. Regards, Jay

[@unclereeko8447]

Not only was your presentation informative but it was structured in a way that is easy to understand. Thanks.

[@D3Sshooter]

Glad it was helpful!

[@spacecowboy2442]

Takes me back 25 years, twin 40s on a 2.1 pinto for autograssing. Excellent videos Steve.

[@D3Sshooter]

Thanks for the comments

[@paulbowyer29]

I found your videos to be a great source of info. I am a retired motorcycle and auto tech. I have a Willys (Ford) M38 Jeep with a turned Volvo B20 engine. The Jeep came with the Webers in a box but being familiar with the stock SU carbs I went with them. The other day feeling a bit bored I pulled the Webers out of the box and started the cleaning and refurbishing process. Once I took the float chamber off I realized I needed more information so I would not ruin anything. This series of videos and the detailed explanations of each circuit are well thought out and very informative. Thank you for doing this.

[@paulbowyer29]

Ok my spelling sucks. Tuned not turned. Cheers

[@D3Sshooter]

Thanks for the comments Paul, that is great to read

[@D3Sshooter]

No problem, mine is even worse

[@mofares1]

I just installed set of 40 DCOE's on my BMW 2002 and am re-jetting the carbs and your video has helped me immensely along with other weber manuals on the internet. You explain everything is such a well manner and I love your diagrams, it's amazing. Thank you!

[@D3Sshooter]

Glad it helped

[@thomasweiser8790]

You are not explaining to much. You do it very well. THANKS

[@D3Sshooter]

I appreciate that!

[@anandarochisha]

I wish that i had seen this Series 37 years ago..great job !

[@D3Sshooter]

Me too , and that I was 37 years younger

[@kenashbrook7366]

What a great source to learn about those mysterious Weber Carbs. Thank you D3Shooter.

[@D3Sshooter]

Thanks for the comments

[@zitta_h5608]

Hello, I'm zitta from Japan. Your logical explanation is great useful for my work. I'm now rebuilding Catermam Seven which equip Weber DCOE. It's my first experience to rebuilt Weber DCOE at this time but thanks to your video I could complete the work without any trouble. I'll keep on watching your video!!!

[@dudleysearle6184]

These videos by Steve are probably the best instructive ones I have watched. I am rebuilding 105 Alfa Romeo engines and have had difficulty in understanding and getting the jetting and settings right. Well done and thank you. You are a great teacher

[@D3Sshooter]

Glad to help, Thanks for the comments

[@trdennis]

I just did a rebuild on my 40 dcoe, while watching your video's. Thanks for these very comprehensive video's! Today was the first time for me to even open up a carburettor! Felt like being back at school again!

[@D3Sshooter]

Thanks, and did it work out for you

[@trdennis]

@@D3Sshooter Well, I still need to refurbish carburettor number 2. 😂 And the intake manifold is at the machine shop for re-treading. Hope to get the car back on track this summer.

[@fairworld2522]

These are some of the best videos that brings values and will stay forever where us and future kids can learn about carburetors.

[@jemandhuman5039]

Just wanted to say your DCOE videos are awesome! I am just preparing a weber for my Giulia and i think your pace, look on details and focus on subjects are perfect! Thanks!

[@novakenss]

I used to have little knowledge of DCOE's and was unsure how to set them up properly. I've seen this video 3 times and others of yours, over a 4 month period and now I'm able to jet and tune them with success. I solved my hanging high idle problem when hot, by loosening the triple carbs spindle nuts. Some were horribly tight and I replaced the old and weak internal return springs. That stopped the 1,800 rpm idle hang that couldn't be stopped with a throttle blip or stronger external springs. I also measured the float levels and all were at 4mm not 8.5mm.. That caused a rich idle that wasn't improved by leaner idle jets or mixture adjusting. Now that the float levels are down where they belong, the idle mixture screws allow me to achieve 13.5 to 1 AFR. That float level change then required me to richen the idle jets to eliminate the bog in progression to the main jets. I now have 900 rpm idle that is smooth and it revs quickly and there's no bogging. Thank you for all of your white board discussions which are far more valuable than just words and for sharing your experience.

[@grinjeanc.1483]

This is the best video i have ever seen about carburator. You are fantastic A lot of work on the carburator and so on the video. A very good work ! Hello and thank tou very much from France.

[@D3Sshooter]

Thank you very much!

[@oliverflower258]

This is incredible. Trying to read up on DCOE's in anticipation of swapping my Datsun 1200 over to twins at some point. Absolutely amazing video - the best I've seen thus far. Can't thank you enough for documenting this in such great detail, and the illustrations were immensely helpful in conveying the information. Cheers from British Columbia, Canada.

[@D3Sshooter]

My pleasure , and enjoy your Datsum

[@MrKinglyon2010]

This has been an awesome series! Thank you for posting this! Also, the same 5 people are giving a thumbs down. Losers. Love the white board. This information is like going to school and learning! Awesome stuff, Steve!

[@D3Sshooter]

Thanks so much!

[@marksanchez8314]

Yes this is the best video that I have ever seen on webber carbs thank you so much

[@D3Sshooter]

Thanks for the comments

[@kurtolsson9557]

Bra Wideo höll på med dessa webrar på 70,80,å 90 talet väldigt kul att se att det man höll på med är lika som de kunskaper jag hade då,👍👍👍

[@D3Sshooter]

Thanks

[@nmc356]

The drawings help a lot. Nothing boring at all. I just completed my base tune which made it richer and the pinging was still there. After your description on fuel delivery, I bought a new fuel pump. It went from 33L/hr to 53L/hr and the pinging has stopped. 👍👍👍 and drive's pretty good.

[@D3Sshooter]

Glad I could help

[@WilliamSmith-vu2uh]

Thank you for this video and all the videos you have shared with the public. They are informative, educational, and very professionally done both in content and presentation.

[@norbhansen]

Thank you so much for sharing all this knowledge. I'm restoring a BMW 2002 and want to fit Weber dual side-drafts. This video has been invaluable.

[@D3Sshooter]

Glad to help

[@cyrilsomerville8211]

Thankyou for you knowledgeable video. I race in Formula Libre with a formula Vee with twin side draft webers dc40. We are about 2sec. Off the pace of the nationals formula Vee SA. I have learnt a few things from you .Thankyou Cyril

[@hughbishopnh]

Very comprehensive explanation of venturi and jet sizing. Thanks Steve. Stay safe.

[@D3Sshooter]

Thanks, you too!

[@keithbarngrover6205]

Excellent video, the best I have seen and the most helpful in selecting Jets for the Weber carburetor.

[@jerrycoon3369]

Wow! What a great video. I have always loved the look of weber carbs on performance engines but never had one. I have always heard people say that they don't work well, and now I know why. It's because they don't know how to tune them!! They are like the "swiss watch" of carburetors. Great video! Now I have to go watch the others!

[@D3Sshooter]

Glad you enjoyed it!

[@fixityourself1111]

Hi Steve, fantastic well informed videos, you have lots of skills up in that head...if i was Mr Weber I'd be offering you a proper super sponsored channel. I'm mid 40s now and have an rs2000 with the weber idf44s i got them bang on once balanced and synchronized. Was probably pot look. I have a few different set ups and you've inspired me to dig them out and see how they run. One little tip if it helps? you might of heard of it...lip barm on gaskets...its an old hotroder trick i believe to swap bits all the time quickly. 👍

[@D3Sshooter]

Thanks for the comments, well I learned something here Lip Barm on gaskets..... I need to check that out TXS

[@ricardorodrigues1003]

I always thought that it was choke x 4 to find the main jet. Thanks again for your fantástic videos.

[@D3Sshooter]

Thanks for watching!

[@ricardorodrigues1003]

@@D3Sshooter is that the correct fórmula?? x 0.05 and the x 0.75? I have 34 Chokes and 130 mains

[@davidlongman2341]

Never knew there was so much in a carb. I do now. Thank you. My cars are now injection which i guess is a whole new lesson but this was really good.

[@D3Sshooter]

Thank you David and indeed injection is another area of interest and hours to talk about

[@johnpoletti7760]

Thank you Steve!!! You are doing a great job! I am running a Mazda MX5 1.6 with 45dcoe Italian webers and really enjoying your videos. I have already made a tuning change to mine and it's improved them greatly! One thing I did do was install a wideband o2 sensor and gauge as I have no access to a dyno. I recommend this a tuning tool. You can monitor the air/fuel ratio on the run. Thanks again for you videos. Cheers from Australia.

[@D3Sshooter]

Sounds great John, and indeed a wideband O2 sensor and analyser is a great tool to have. Especially if it an log all your data ( ECU and NOX) while taking that test ride. a 45 , wow that is large for a 1600... , but maybe you have a smaller venturi ? What is your prime venturi ?

[@johnpoletti7760]

@@D3Sshooter hi steve, and thanks for the reply, yes I figured they are a large carb for the size engine. I bought them second hand sight un seen from a guy who assured me they were properly set up for his 1.6 mx5. Turns out they were a very base set up and I'm lucky enough to be doing the fine tuning. The main chokes are 32mm.

[@yogilours722]

Hello Steve Very interesting, soon 2C is good and I can't wait to see this carburetor work. Nice to listen to your explanations over a good cup of coffee! Thank you

[@D3Sshooter]

Glad you enjoyed it

[@sjp52047]

Very good, concise explanations. Once again you have done a very practical and educational video. Kudos to you. Regards, Solomon

[@D3Sshooter]

Many thanks!

[@alexjuliaschoenenberger6092]

The best video about Weber carbs! Thanks a lot for your job! Very clear and great explanations

[@D3Sshooter]

Wow, thank you!

[@ronpilchowski9898]

I gave up on my weber, I jetted it 7 ways to Sunday. Nothing would clean up the rich exhaust smell. Just finished Installing a Holley super sniper EFI, Wow!!!! What a difference

[@D3Sshooter]

Indeed EFI works nice

[@harolddavis5252]

I have a single side weber 40 series card and intake for ford pinto 2.0 motor.i enjoy the knowledge gained from your show

[@D3Sshooter]

Thanks for the comments

[@mikeburton7077]

that was very interesting ,and the first time I have a reasonable understanding of the Webber ,thank you

[@D3Sshooter]

Glad it was helpful!

[@tasnikas746]

Thank you once more for sharing knowledge Steve. Very informative tutorial and the board charts compliments the whole procedure. Well done

[@D3Sshooter]

Glad it was helpful!

[@gideondemooij8100]

Hi Steve, great video! Due to your video I learned a lot, thank you!!! I bought a set DCOE 40's from a guy that used them on a Nissan Sunny 1300. I am planning to put them in a DAF 66 with 1400cc engine from Volvo 340 and Renault 5 Alpine cilinder head. I will use the DAF for fast road and nice weather sunday drives. The DCOE's now have the following base setup; 32mm main venturi's, 4.5 secundary venturi's. My main jets are 1.35, F34 emulsion tubes, 2.10 air reduction jets. The idle jets are 55F17's. Injection jets 35's, bleed/return valve 60 and 150 needle valve. So I think the base setup is quite off. Will search for the right parts for a proper base setup. Again, thanks a lot and keep up the great video’s! Vriendelijke groet uit Nederland:)

[@D3Sshooter]

Thanks for the comments, and happy to see that it helped you out... that is an interesting mix DAF66 with a Volvo engine and a R5A head . yes that seems to be a bit off

[@vladislavstanimirovic9650]

Thank you so much for the series! I have a Weber 32 DFT, that drips some fuel in idle from the auxiliary venturi in the second barrel. Some "mechanics" have messed it up completely, so l'll try to readjust the float and the butterfly idle position to try and bring it in order.

[@D3Sshooter]

Yep , some really do more damage then good . Good luck

[@deangiacopassi8757]

Every mechanic that sees my Lotus Elan with twin DCOE's wants to mess with them. I think it runs fine.

[@Bart-ut7cn]

Never seen anybody that can explain like you, thx

[@franksmodels29]

Great vid .. a very clear and in depth look at that carburetor.. I learned the hard way back in the day... 👍🏻👍🏻👍🏻

[@D3Sshooter]

Glad it helped

[@geraldswain3259]

This has been a great series Steve, for the experienced and novice alike. Really well explained in detail that's simple f or your viewers to absorb. Well done. PS on a 2 ltr pinto unit we would by choice use 45s for a pinto in a mid state of tune going up to 48scand 50s for full house units.

[@D3Sshooter]

Awesome, thank you! Indeed 45's. In my case it was already fitted with the 40 a bit on the low side/ but with the richer main jets it might just work// will see how it will do on the road test. But first the distribution belt change, clutch and electronic ignition changes

[@kindledlight]

This really inspires me to want to build a set of 40s for my B6ZE Miata. Having that old british sports car style with a set up suspension would be so much fun. If only it used a distributor and not a cam angle sensor...more math. Thanks for the incredible video!

[@D3Sshooter]

TXS for the comments

[@edgarpereira8410]

The best video i ever seen, about side draft webers Thank you

[@D3Sshooter]

Thanks for the comments

[@slawnski]

Great tutorial! Thank you for taking the time. The whiteboard time was very helpful. Please keep the videos coming.

[@D3Sshooter]

You got it!

[@carlkeese6620]

I’m amazed at your knowledge and the ability to share it on these carbs! Thank you for the videos. I’m working with one on a twin 650 and not many people know anything about them in the states.

[@D3Sshooter]

Good luck! and happy that it helped

[@anair70]

I thought I knew a bit about carbs but I was so wrong. Learnt so much, thank you for taking the time to make this video.

[@D3Sshooter]

Glad it was helpful!

[@janghys4970]

Again a very interesting explanation. Well structured and ... loud and clear! I understand now why our Alfa GTA was not tuned very well the time that we raced that car in Zolder. We were much younger then, and the word "Internet" had to be invented, so ... D3Sshooter was not available that time! By the way: you are able to write left and right handed! :-) Wow!

[@D3Sshooter]

Haha Jan , indeed we were much younger and information was hard to get. Webers were like black magic and only few had the know how... Zolder, I have been there for some track days... Are still in the race arena ?

[@janghys4970]

Beste Stephane, of Steve, ergens heb ik het gevoel dat we mekaar ooit al eens het pad gekruist hebben. Echt racen doe ik niet meer, maar ik heb nog altijd mijn R1 full in de garage staan. Met helm op zie je mijn grijze haren niet, en bij een initiatie met de Motorschool in Zolder ben ik de eerste bocht naar links volledig met mijn vingertoppen over de grond gereden! Dat zijn "Big Bang"-emoties hoor! Ik heb een mail-adres waar ik je kan bereiken. Geef op dit bericht een duim, en ik passeer je dan wat meer info over mezelf, over Zolder, en nog andere dingen! Blijf aub intussen verder doen met jouw instructie-video's. Ik hou bijna meer van jouw manier van lesgeven, dan de les zelf! :-)

[@backyardracers9041]

Apart from the great advice, I loved the small spider crawling over the head at the back corner. Its like he was the apprentice. Young Spider-Man

[@D3Sshooter]

Thanks for the comments

[@pietromartini2922]

Thank you D3Shooter ! You opened a new world of knowledge for me right now, and I am sure, many if not all, who are here, got many questions (that were retriggered even in food related issues by the word "carb"), clearly answered. Would you consider becoming my uncle ? Hahahaha xD All the very best, and a big thank you again !

[@D3Sshooter]

Thanks for the comments, an uncle sure

[@johnmason6530]

Fantastic video learned so much about my Weber's. Can't thank you enough 😊

[@Classiccarbscouk]

Enjoyed watching this, with my morning coffee, very nice, thanks Sir!

[@D3Sshooter]

Glad you enjoyed it

[@joelpalmer]

Thank you for the great and very detailed video. We hope to use a Weber carb on a SAAB V4 engine (Ford Cologn) In our 1973 Model 96. Excellent and well done!

[@D3Sshooter]

Glad it was helpful! Was type are you planning to use ?

[@joelpalmer]

@@D3Sshooter Really dont know. First I need to locate a suitable intake manifold for the V4 that will accept a Weber two barrel. Engine doesnt make very much horsepower and we are hoping to make the car a bit quicker

[@steeliewheelies]

Extremely helpful & informative, thank you so much for putting these videos together. It’s a big help! Also very funny at the end lol

[@D3Sshooter]

Thank you

[@marktelford2160]

Simple and informative! Love your presentation style. Can't wait for the testing and fine tuning video.

[@D3Sshooter]

Coming soon! Thank you

[@harlockwaruszewski5950]

Gotta say I’m jealous of your knowledge. All this stuff is becoming a lost art and trying to do this now with only the internet as a resource is shooting in the dark with a little bit of light. To many ppl without the right info acting like they know it like you do. Thank you for doing this video series!!! I just wish more people did in depth videos like you rather than the crappy useless videos out there. Thank you again, and if you’ve got a website I’d love to touch base with you about doing a blow through triple 45dcoe.

[@323baur]

Indeed thank you for the information you provide and mostly the story with it. Greetings from Holland.

[@D3Sshooter]

Thanks for watching!

[@esseelettronica8507]

Thank you for your video which has fascinated me above all for its exhaustive explanation. a greeting from Sicily stay safe

[@D3Sshooter]

Glad it was helpful!

[@69MazdaR100]

Wow, best Weber video I’ve ever watched! Subscribed! 👍

[@D3Sshooter]

Welcome aboard!

[@Tony080897]

So much detail and knowledge in these videos, I love them! Keep it up!

[@D3Sshooter]

Thanks, will do!

[@ettoredomini3189]

clear and above all practical demonstrated video

[@D3Sshooter]

Thanks for the comments

[@motorheadshed8262]

Great video. Thanks! Your whiteboard and discussion was NOT too much.

[@D3Sshooter]

Glad you liked it!

[@george5022]

Thank you, learnt so much this morning, great quality videos, look forward to your next, brill

[@D3Sshooter]

Glad you enjoyed it

[@istvanburuzs9843]

Very educational video, thank you for creating and sharing it!

[@nickdewith2932]

Well done , very thorough and precise. Cheers

[@D3Sshooter]

Thank you kindly!

[@goma2809]

Sublimely clear. Great explanation, as usual. Thanks!

[@D3Sshooter]

You're very welcome!

[@JRBecraftMPH]

Another outstanding installment. Thanks.

[@l3v4rt]

Great video man, super useful! I am now in process of restoring a car and picked up a repalcement engine yesterday and my wish was to go dual webers but was unsure about it since I don't know about carbs but this is very very helpful! Steve, this is awesome! Please keep up :)

[@D3Sshooter]

Thanks for the comments

[@paulmuff9883]

Brilliantly done as usual ❤️

[@martinrodgers6114]

Your videos are fantastic. Thank you so much!

[@D3Sshooter]

You're very welcome!

[@ricardorodrigues1003]

Fantástic vídeo sir....the best i have ever seen.... Im having a strugle with my BMW 2002...after 3000 it just flyes..... But before... If i go wot in low rpm..before 3000...its not very good... I cant understand if its the idle or the main jet because if i go on 80%on the aceleretor on low rpm... Its good... But at full throtle..it blogs a bit... Specialy on the transition from idle to main. I have 32chokes 130 main 180airs 55f9 idles F9 emulsion tubes. Its almost perfect..... But i canot solve this litle issue... I have learn a lot about carburetors.... But you sir...are the best!

[@D3Sshooter]

Thanks for the comments, well do a few tests with different emulsion tubes, and make sure that fuel pressure and float levels are correct

[@ricardorodrigues1003]

@@D3Sshooter thanks for you answer, i had f11 emulsion but it feels better with f9... More responsive..... It only hapens in very low rpm... We ear that vroaaawww that makes with Open throtle but maybe because its only 2000 rpm Thats too much gas in such low rpm... The car GOES.... But i feel that with a bit less acelerator on low rpm the car picks up Faster..... Thanks

[@OwhyeeVdub]

Very helpful info for setting up my IDF.

[@nathan290192]

Great! Thank you for the time and effort you put in this. It really helped me out!

[@D3Sshooter]

You're very welcome!

[@tombohner3042]

Really very helpful!! I am having a problem with my acceleration pumps. I have a 3 carb setup for an E Type. All three carbs have the pumps stuck. Any advice will be helpful.

[@fulcrum811]

I have been comming bact to this series of videos many times working on my Weber fuled Alfa in the past 2 years. Now I am wondering, have you changed your setup after driving your car? What jets have you changed and why? Its always great to learn from you :)

[@jodauth3319]

Very informative, can't seem to find your next video on tuning and balancing DCOE's have you made it yet?

[@ariegt]

thank you so much for this very understandable explaining. i searched a lot on dcoe's but never seen a video into these carbs like this. i got dual 40 dcoe solex carbs i try to dial in. got hesitations going on from idle to fast rpm but not after some pre-revving next to only good running on a slight high idle. is this explaining the same for the solex carbs ? kind regards

[@discogodfather22]

Awesome series on the DCOE, can't wait for the tuning video. I wonder if I could bend your ear for a minute: I have a Lotus 907 (dual overhead cam 16v engine) with a high compression (9.5 to 1). Dual 45 DCOE's, running a 38mm main and a 4.5 aux. I have been attempting to tune it for many years, and recently got some help and installed a wideband A/F gauge. The setup the engine seems to like is bizarre: a 120 main jet, 170 air corrector, F4 emulsion, 55 pump jets, 55F9 idle jets, and a 40 pump exhaust. 8mm float height, gets a solid 3 psi of pressure. She runs at around 13 to 1 at idle, about 12 to 1 at cruising, good progression. Pops a bit on decel, and the gauge reads around 16 to 1 on decel. Good power. It always struck me as strange that it likes such a small main jet- or is there something I am missing? Should I go to a smaller idle jet and pump jet to see if this will allow for a larger main? According to the math, it should require a 140. The engine has a big cam and is optimized for high RPM's, with a redline at 8000.

[@D3Sshooter]

TXS for the comments, have you checked the float level, as that will have a major influence on the emulsion tube. You mentioned the AFR, that seems to run lean. I wonder under which state that was Idle, progression, WO, cruising. That is important to know as Weber has multiple channels for each of those states. Are you sure the float level is maintained at WO. Popping in the exhaust or inlet...?

[@discogodfather22]

@@D3Sshooter I recently checked my float levels, these are Spanish webers with the plastic floats so it was at 12.5mm. I have an in car fuel pressure gauge and it is always steady at 3 psi. You mentioned the AFR being lean? What should the AFR be at idle, cruise, and WOT? I recently changed the pump jets from a 55 down to a 35 and it seems to have made a difference. My readings are: 13.5 to 1 at idle, 12 to 1 cruising partial throttle, and around 10-11 to 1 during WOT. On deceleration, it can dip to as low as 16-17 to 1. What is a good closed throttle ratio?

[@justalf]

Awesome video thanks again!!! Question, should the plastic mounting O rings be oversized, I’ve just taken the carb off to drill a 7.5mm hole in the inspection plate and now can’t get the rubber back in the plastic mount…. I’ve bought the metal Swedish plates as a precaution but wanted to get your thoughts. My Weber is an old Italian 151 without the hole in the mounting plate. I drilled it as I’ve been gettting a leak between the carb and manifold after a hot run…… cheers!

[@ffdd564]

Very good video... finally I understand those bloody webers. One question : what is to be expected if the fuel level in the bowl is lower than intended ? My weber DCOE40 carburettor mounted on a Triumph Spitfire works well except.... that there are always drops of gasoline coming off from the air filters. I was thinking that perhaps to resolve, I could lower by a couple of mm the level in the bowl. Would that work ? or will other issues come up ?

[@D3Sshooter]

Thanks for the comments, if the level is to low then you will be running lean on the main circuit ( cruising, and slight acceleration). The problem that you describe is flooding , very dangerous. I have seen cars in flames because of that. If you see the main / secondary venturi with dripping fuel, on idle or even when stopped after a ride and the engine shut-off, you most likely have : a bad needle valve ( fuel inlet to the carb) or the wrong float level ( to high) or to much pressure by the fuel pump ( forces fuel into the carb although the needle valve is trying to close it).

[@TheDaf95xf]

Evening Steve. Hope your all keep safe and well? Love the wipe board drawing as it makes so much sense 👍🏻 How on earth did they design those carbs to work in the first place lol 😂 Covid-19 maybe a pain in the derrière but sat on the settee watching the master with a brew is just perfect 👍🏻 The verity of content of your channel is absolutely fantastic. So a big thank you Steve for putting the time and effort making these super videos. Take care until the next time cheers Stevie 😎🇬🇧

[@D3Sshooter]

Hi stevie, I happy that you enjoyed it. The whiteboard has always been my pet tool. In the office, when we design new concepts I always use a large whiteboard.. Much better then Power point slides. That is something for managers not for engineers. Its my pleasure and the thank you's are actually for you as you are watching and commenting. Txs again

[@RichieRich845]

Hi, the mixture screws with the springs should have a cup washer with an o'ring under the cup washer, my Weber DCOE 45 has them, yes/no or is my Weber newer? I also have one adjustment on mine that I can't see on your Webers is for air intake, they have a plastic cover on them. If you take the cover off you can see a nut that is attached to adjusting screws (like you would see on adjusting adjusting valve clearance) Thank for the in depth information.

[@D3Sshooter]

Thanks for the comments, I think that yours is newer or Spanish made. The Italian does not have that, nor is it in the parts manual. Yes indeed there are models with and without air intake for the idle. This model does not have it.. Others more recent do/

[@RichieRich845]

@@D3Sshooter Hi, no mine are Italian made, must be newer. Are sure about the o rings, because without them more air would go in making them hard to get the mixture correct. Let us know next time you tune them, cheers.

[@gerrykraan7049]

Hi Steve, I don't know if you still look at this page, but I just love the way you went about telling us how easy the carbi works, so I have a 1975 Kombi and made it a 2100 cc motor, bought a weber carbi, standard, but can not get it to work, specially the excaluration pump, have you got any ideas how to go about this please, thanks Gerry

[@D3Sshooter]

Thanks for the comments and yes I try to look at all comments ( but its a lot)... I don't know which weber you bought, what I can tell you is that the Spanish or Chinese replica's are useless and have often defects ( I have one like that build in Spain, bought new but crap). The main issue is blocked channels and poor surfaces. If in your case only the acceleration pump is the issue. Then take those pieces appart and check the membrame for holes, but also the little return valves and the steel ball ( this one is often missing).

[@_____7704]

Very methodical video, excellent

[@D3Sshooter]

Glad you liked it!

[@skippywinters]

By far best detailed video about Weber DCOEs. If someone could help me in selecting jets and Venturi sizes? Have a 1970 Bmw 2002, slightly modified 2000cc with 284 camshaft and ti head and pistons. 40 DCOE Weber’s with Around 135bhp peak power around 5600rpm, redline at 7000max. Having trouble starting and often dies at idle. The manual gives the following examples: Jetting for standard 2000/1800/1600 Pinto on 40s 34mm Chokes 135 main jets F11 emulsions 190 air correctors 35 pump jets 40/f9 idle jets,45/f9 for 1800/2000 4.5 aux vents Jetting for modified 1600 Pinto on 40s 34mm chokes 140 main jets F16 emulsions 190 air correctors 40 pump jets 40/f9 idle jets 4.5 aux vents What in your opinion would be the ideal setup for my configuration? Wish they had a modified 2000cc with 40 DCOEs in the list of examples. Thanks guys

[@D3Sshooter]

You can go through the book and define all the standard jets and yokes and so on. Then test drive and adjust.

[@ricardorodrigues1003]

Fantástic!!!! Cheers from Portugal!

[@D3Sshooter]

Thank you! Cheers!

[@robertbandusky9565]

Should be a college course. Thank you professor Steve😎

[@D3Sshooter]

Sorry for the late reply , as i was away for work. But thanks for the comments.

[@ljprmc]

THanks for such a great video . It has helped me alot to understand the weber Carb. Its realtive to my needs, as I have an engine with triple 45mm dellortos that is giving me some trouble . I suspect that the selection and tuning of the carbs is probably the reason for the hesitation at take off. Do you know of an equivalent tuning manual for the dellotos carbs such that will allow me to check the setup , or maybe there is an equivalence tool that compares jets / emulsions between the weber and dellorto and I could do a virtual build as if the motor had webers and convert the calculations to dellorto ? For your info , the engine is a 4.3 litre , Chrysler charger of the Australian Chrysler company . The engine was designated the E49 , and was designed to produce 305 Hp , at 5400 rpm .

[@D3Sshooter]

Hi, I believe that I have seen the tuning manuals for delorto . I suspect that you have an issue with the progression circuit..../holes. Check this one : www.iwt.com.au/private/Dellorto%20manual.pdf

[@RichSnooks]

Excellent explanations, thank you.

[@mattastropheflats]

Incredible video. Thanks so much. Does a modified cam impact the size of jets and Venturi? Does the Weber book talk about that?

[@glenn4252]

Can you please do the fine tuning part too? I really enjoyed your videos and learned a lot!