Sunbeam Alpine: Fitting and Understanding Twin 40 DCOE Weber Carburettors
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- เผยแพร่เมื่อ 19 ต.ค. 2022
- This video includes a complete strip down and explanation of Weber Twin 40 DCOE carbs by Weber enthusiast Trevor Hibdige. Trevor rebuilds and tunes DCOE carburettors, he machines and 3D prints unobtainable parts for them and is able to resolve all of the usual issues that these carbs present. It is a long video but has been edited down from several hours of conversation and demonstration. If you want to understand carburation better or if you are a DCOE enthusiast, this is a video that is worth settling down and watching.
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This video is a must watch for Weber owners. I am sure that the theory applies to the IDF as well. Thank you for putting this together.
Thank you for your kind comment. We try really hard on this channel to give accurate and 100% correct information that will help owners.
It was really fun making this. We hope you enjoy watching. Take it in blocks or get a big glass of your favourite tipple....
Thank you for sharing so much of your knowledge and expertise Trevor. People will benefit from this video for a long time to come.
I opted for the second option…. Hic
@@Know-Expert good plan!
Great review of how the Weber carburettors work and shows how we can all improve our cars running. Thank you for this video. Cheers Bob
Thanks Bob, Unlike a lot of the stuff that gets posted on the Internet the information here is correct. Trevor is a genuine expert and incredibly knowledgeable on DCOE carbs.
Fantastic video. The comment about DCOEs always smelling of petrol because of their float chamber venting solves the mystery of why my Escort MK1 '70 needs the garage doors and windows open after a run out.
Thank you
I’m glad that you enjoyed the video, best wishes.
Hi @@TheSunbeamAlpineChannel , again 🙂. I found yet more insights from your video. My pair of Webers had both the large hole vent AND the castellated spacer on the jet inspection cover. I've removed the spacer and look forward to less petrol smell.
@@corbishj fingers crossed!
I just watched all this very interesting and very informative video even though like Tim I’m going for the club Weber. I picked up some tips and also info on what to avoid when installing my carb when it arrives. Thanks Tim and Trevor
Glad that you enjoyed it.
What a smashing guy! Great video!
Trevor is a great guy. Thank you.
Absolutely fascinating.
Keith, unlike a lot of people who write things in the internet, Trevor really knows what he is talking about and is great to listen to.
Thanks for all this wonderful info.
Hopefully it will all be relevant for my Alfa 105 with 40 DCOEs
Gerald, we hope that this video helps you. Good luck with your Alfa.
Thank You for a very educational video.
I have 3 Weber DCOE 40 carbs on a Datsun 240Z
The car came with a mechanical and a electric fuel pump..
My problem is cold starts after weeks or long storage times
To start, i run the electric pump for 10/15 seconds then turn the engine over and pump the gas.
Get a lot of bucking.until the engine smooths out. I some times I can smell a small amount the fuel when before starting.
I think the fuel is evaporating from the carb bowls.
Thank you for any help you can provide
Hi there. DCOEs are open to the atmosphere via the float chamber vents and so do evaporate readily. As you have noticed when you switch on, the electric pump can be heard to click away which is normal as the float chambers are refilled.
But a couple of things to check.
The underside of the body has a square plate with four screws and the Gasket of that plate could leak. Under the plate is the float chamber debris and water collection chamber so it could be worth removing the plates and checking the condition of the gaskets and replacing. They are cheap enough and all the DCOE parts suppliers will have them.
A few are
Fast Road Cars
Southern Carburettors
Webcon
Now you say you have both mechanical and electrical pumps. Presumably the electric primes the mechanical? You might check the fuel pressure at the carbs when running as the inlet pressure ideally needs to be less than 3.5 psig or the carbs can overfill particularly on bumpy roads.
So the smell of petrol on starting is very common. You pump the throttle four or five times to the floor which squirts fuel via the accelerator pump directly in to the inlet which effectively is the replacement for "pull the choke out" and the engine fires and runs lumpy as hell until a few minutes when all smooths out. It helps to rattle your foot on the throttle during the initial lumpy phase as this squirts little bits of extra fuel in as it warms up. Most users of DCOEs disconnect the "starting device" which is all but useless and use the squirt the throttle to start procedure. The side effect of that is the accompanying smell of petrol which is normal.
An answer from the expert! Thank you Trevor.
Hi Trevor, I might have an interesting one for you.
Go kart.
250cc
Twin 4stroke
13000rpm
45dcoe 152
40chokes.
At present in starts, idles and pulls away. Bottom end is there, top end is to.
Got to fit an anti surge gasket then out to finish the mid range. Jetting is interesting.
Trevor’s email is in the video, I’m sure he would be interested in this problem. Unfortunately he is the expert on DCOEs, not us.
I've made contact with Trevor so all's good thank you.
@@evotoadracekartscars.6738 👍
Hi, I could not find Trevor‘s email in regards to this specific Weber carburetor that I have is there anyway you can provide that to me. I have a few questions that I’m hoping he can walk me through.
Thx I thought his email was going to be provided somewhere in this video description but I can’t locate it. Any help would be awesome thank you so much guys.
Hi, Trevor’s contact details are shown in the video at 1:06:34. Best Wishes.
I've just bought some reconditioned twin weber 40s, I want them fitting to my pre crossflow cortina mk1, one of them has no 998on the top, the other one has no 8l on it, I wasn't aware there were different models, I thought they could just be re jetted to suit, these carbs don't have the extra hole at the front, but when you go to the burton power website and look at the ones for the pre crossflow, it has the extra hole on the front, can you advise weather these carbs will work? They have been professionally cleaned and restored.👍👍👍🇬🇧🇬🇧
Hi, Trevor’s email address is shown at the end of the video. If you send him a message I’m sure he will be able to help you. Best Wishes, Tim
@@TheSunbeamAlpineChannel cheers bud, will do 👍 nice of you both to take the time to make this video.👍🇬🇧
thank you so much 4 this video u have educated a semi talented amerture is there anyone out there who has a inlet manifold suitable 4 a alpine 😁😁
Gary, we are glad that you found it useful. You can buy a ‘gooseneck’ inlet manifold from Redline brand new or modify a GLS manifold as shown in the video. Good luck with your search for one.
Gary - I know of a couple of manifolds for sale. One Redline and one Draycott. PM me for more info
@@garymoore7150 contact Trevor directly (his details are in the video) and he will advise you how to buy one.
How about trumpets that adjust as you rev
Isn’t that called fuel injection and an ECU?
@@TheSunbeamAlpineChannel no fuel injection l know about takes advantage of variable trumpets to affect the ramming effect of resonance at different rpm's. I'm thinking side draft webers with trumpets that move... Hell, have headers that move like a trombone due to rpm too.
@@michaelannen4168 I’ve not heard of trumpets that move, I thought you were joking! Best wishes.
Hi ls trevfor available to help me with a Webber 45dco. It’s leaking fuel, it’s on an old race car called RAM 35 , Austin healey it’s been stood for 20 years
Check your email for some assistance. RAM 35 is legend.
I've asked Trevor, if he can make contact with you.