Weber DCOE....

[Baz]

A certain Dr in the forum said if I should get a weber, get a real one (DCOE)....
I thought they only came in 40, but I've found one which I have first dibs on that is a 45 with canon manifold.
Anyone know anything about these? It's inexpensive, but is it what I want?
I know nothing....

 

[RonMacPherson]

In essence, too big!. Unless you wanna spend beaucoup bucks for auxiliary venturis, etc. Go with the 40DCOE.

 

[DrEntropy]

Ron's right. A 40 is as big as you want to go.
That Dr you referred to was specific on size, IIRC. /bcforum/images/%%GRAEMLIN_URL%%/smirk.gif

 

[Baz]

He was, just thought bigger was better. Thanks for the tips.

 

[jlaird]

No matter what you see in your spam emails, bigger is not better. It's technique ie. a straight line.

 

[Bugeye58]

A DCOE 45 is too big for an 1800???
Jeff

 

[lawguy]

I always thought a 45 would be good for a free breathing 1800 and a 40 would work for a mildy warmed 1275...but what do I know...wait, don't answer that.

 

[DrEntropy]

A DCOE 45 is too big for an 1800???
Jeff

No, but it will need some more expensive, harder to come by Weber bits. Venturi to begin with. The intakes may need some work too, as most I've seen were matched to the 40's. There's more... should I go on? /bcforum/images/%%GRAEMLIN_URL%%/jester.gif

 

[Bugeye58]

No, Doc. No need to elaborate. Now that I think of it, the 45's that I've seen on B's probably had 36 or 38mm venturis in them anyway. I wish I still had my big cabinet of DCOE, DCNF and IDA parts. Sigh....
Jeff

 

[Joe Reed]

People are telling you the carb is too "big", you'll have to buy expensive and hard to find parts, etc. when they don't even know how the carb is presently configured! It could already be set up perfectly for your car - or not. No one here knows. It could even need different chokes, etc. The more it has to be retuned, the more $ and time you'll spend - because (apart from the idle mixture) you have to change parts to tune it - as opposed to turning screws. Plenty of MGBs (mine included) are happily running 45DCOEs...

 

[RonMacPherson]

I consider you a fortunate soul. Here in Hawaii, we've got a couple of B's with 45's. After I had them reduce the main fuel, increase the accel pump (change the little cam) reduce the choke/venturi size(One did, one moved back to the mainland, with choke/venturi data in hand, go to F2 emulsion tubes and increase the idle fuel, the owner is a lot happier. W


What do you have yours set up to? what about ancillaries,i.e. cam, exhaust, cooling system.

 

[Joe Reed]

I can't remember all the details (have them recorded at home).

I've got a stock CB exhaust system (including header), cooling system is stock, cam is non-stock but mild (probably considered a "fast road" cam). Stock head. Otherwise stock low compression engine. Recurved mechanical advance 45D.

I have 34mm chokes...and that's about all I remember. I'm pretty sure the idle jet is 50F2, but I'd have to look that up to be absolutely sure. I do know that my main and air correction jets are somewhat different that you typically see recommended (smaller - especially the mains), but the car runs great, no hesitation or bogging, and the plugs look perfect.

I agree the DCOE (either one) isn't for everyone, but one that's properly set up works just fine and is maintenance free. I just see too many people not familiar with the carb jump to the conclusion that ALL DCOEs are "too much carb" for an MGB - without knowing anything about the specs of the carb. If it had 28 or 30mm chokes, it would be way too little carb! At lot of people don't realize that the 40DCOE and 45DCOE can actually be running the same size chokes within some limits (26-36 for a 40DCOE, and 28-40 for a 45 DCOE), they think all 45DCOEs are the same....or, at least, that the "45" indicates the choke size.

Would I remove a perfectly good set of SUs and replace them with a DCOE? Nope. Would I opt for a DCOE to replace a set of worn out SUs. Maybe...maybe not. It would depend on the total cost of each.

Just for kicks, I just added up all the possible variations of a 45DCOE considering all the different chokes, jets, etc. available. There are potentially over 1.3 billion variations! Of course, the number that would actually be useable for anything would be substantially smaller. That almost infinite ability to adjust the carb is what I always say is both a blessing and a curse. It's nice to be able to have that kind of latitude in adjustment...but it can get very time consuming and expensive, especially if you're not close to begin with...

 

[Bugeye58]

That's why I wish I still had my big cabinet full of Weber parts, Joe.
Jeff

 

[Ed Kaler]

Baz:

Is Mel still at Metric Wrench?? /bcforum/images/%%GRAEMLIN_URL%%/thumbsup.gif

If so, go chat with him!!!

/bcforum/images/%%GRAEMLIN_URL%%/cheers.gif
Ed

PS: Now re-starting idea of running down to see you!!

 

[DrEntropy]

Okay, it ~may~ be set up perfectly for an MGB. Stranger things have happened.

At lot of people don't realize that the 40DCOE and 45DCOE can actually be running the same size chokes within some limits (26-36 for a 40DCOE, and 28-40 for a 45 DCOE), they think all 45DCOEs are the same....or, at least, that the "45" indicates the choke size.

...and I know what the "45" means, Joe. The pile of iron and frozen snot in my sigfile are ALL fitted with Webers. Well, all but Diesela of course. /bcforum/images/%%GRAEMLIN_URL%%/jester.gif

...and there are BDA's with 45's in my past.
I just don't want to see Barry tossed into the deep end of the pool. The real way to set up would be with an on-board gas analyser and Jeff's missing cabinet. Barry's never had either, but at least would have had access to the cabinet.

Would I remove a perfectly good set of SUs and replace them with a DCOE? Nope. Would I opt for a DCOE to replace a set of worn out SUs. Maybe...maybe not. It would depend on the total cost of each.

There ya go. We agree totally.


EDIT: BTW: Did you just call me: "people"?!?!

*sheesh*

I'm incensed... /bcforum/images/%%GRAEMLIN_URL%%/wink.gif

 

[Baz]

Thank you Doc, it really does appear that this would be too much carb for my needs, in many respects, mostly my lack of tech-sperience in the areas of webers that are not attached to Ford Fiestas.

 

[billspohn]

You'll have to find out what the carb was set up for to know if you can use it on an MGB.

BTW, the 40 DCOEs on my crossflow pushrod race engine actually had larger main venturis than the 45 DCOE I run on the Twincam. Sometimes less is more. And FWIW, using a Weber on an MG engine on the street is a waste of time and gets you no usable power - people generally do it for the bragging rights. They'd be better off with a pair of HS6 SUs if they were after drivability coupled with a bit more power.

Although I do like Webers.....