What is the big deal about the dellortos? What is the difference between them and the webers, pros and cons?

 

The whole idea of the dellorto was it was supposed to be an improovement on the origional weber concept. Basically made using more modern manufacturing techniques. A good example would be the origional webers had brass floats but the dellorto used poly urithane floats

The current weber carb uses poly urithane floats, and has been improved alot so the dellorto doesnt really have much of an advantage. The one advanage the dellorto has is its jets go up in smaller incruments than the weber. Webers go up by units of 5 and dellorto goes up by 2 or 1 I believe. So you can technically do a little bit more fine tuning with the dellorto

Now the bad news. Weber parts are going to be 10 times easier to find because dellortos arent being made anymore. Much more aftermarket support for the webers too.

Changing jets is also alot easier on the weber, given the choice, id choose weber any day of the week

 

Add a Holley to the mix??? I've only used Holleys in my custom built engines. How do the 3 stack up?

 

i dont know much about holleys but from what I understand is you cant fine tune them nearly as well as a weber.

No emulsion tubes to change, cant change venturi diameter, cant change air bleeds. im probably wrong about some of this

 

My engine builder was more comfortable tuning a Holley & only worked w/ them. Are Webbers more tricky? They seem to be the choice for peripheral ported (race) rotary engines.

My 750 Holley:

 

its just from my understanding that they are MUCH more tunable. Plus you dont have problems with webers floats botteming out on hard conering like you do with holleys

they arent that tricky to tune at all. And besides, webers sound cooler

 

I like the weber myself, it was easy to learn and lots of online write ups on how to tune it. course my enginebay isnt that clean.

 

IF you are talking about a dellorto, then you are talking about a side-draft style carb.,

In which case the Mikuni 44PHH is the way to go!

 

I'd go with Weber since rebuild kits and jets are readily available. There are still old dellorto parts in circulation, and I have a contact who goes to Italy every few years to restock, but some dellorto parts are scarce. No one has a dellorto 3.00 needle and seat anymore for example.

Also, when you go to the dyno shop to dynotune your motor, chances are they have boxes of weber jets but nothing for the dellorto.

 

So what is so much better about the side-draft? I've heard good about those as well. The reason is I plan on doing a small to medium half-bridge, and I am not sure about any carb because the only carb I have ever run has been the nikki, (well, other than what is on my bike...not sure about that one). What would be good for this type of application?

 

With a half bridge, the logical choice would be a four barrel carby like the Holley so you can feed the secondaries separately. Even better would be a twin Weber setup.

 

On the twin weber, one would feed the primaries and one the secondaries, correct? And were I to do this, how the hell would I set that up? Other than that I would probably have to go with a holley.

 

One thin you can do on a Dellorto, but not on a Weber, is changing the jets while running. Great help when on a dyno!

Oh yeah, parts are not that hard to find, Dellortos are really common in tuned VW Bugs, at least here in Europe