Do they both have the same manifold, jets, chokes, filters, sound and performance.
Im just considering which one to buy.

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Morgs

i don't know any technical detaiuls, but i think you'd be better off with a Dellorto, as Weber is a barbeque company...

not sure about performance, but a weber carby is far more common (dellorto kinda rare and expensive) so maybe more parts availible if you need them, more people know about them.

depends on the price really, if there is a significant difference (i assume there is)

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78 Leyland Mini - Prince

I think you will find quite the opposite. Dellortos are quite common and alot cheaper as they come off old junky italian cars like alfas (uh oh, here come the flame posts )

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Lillee - 1969 Morris Mini K

oh, there you go. i thought they were kinda rare? for minis anyway

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78 Leyland Mini - Prince

Less used than Webers overall perhaps, but I know of several cars on here that run Dellortos, mine included.

Performance wise, apparently the Weber does go hard for racing, but Dellortos are suposed to be good for fuel economy. I think that's bollocks cause mine drinks like a badly tuned V8...

If you can get your hands on either, then they will be very closely match for performance, sound and fitment. To be honest I think Webers attract a higher price for spare parts. Dellorto.co.uk are pretty darn cheap for parts (example ram tubes, the lowest I got quoted in australia was $135 for a pair + postage, Dellorto.co.uk I got a pair landed for $77. 3 days delivery).

If you look hard enough you may be able to find a 45 Dellorto with a manifold and linkages for around $250... See if you can get a Weber 40 on it's own for that price...

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Lillee - 1969 Morris Mini K

Dellortos and Webers are very similar. They both have that nice gurgling sound under acceleration. They should offer very similar performance.

Webers have been the darling of the street tuners for many years probably because Ferrari use them. They have a greater variety of jets and specialists who understand them so in theory you would have a better chance of getting a Weber running right on a Mini.

40 mm dellortos were used on Alfas in the 70's and 80's so are common. Don't know what cars use 45 Dellortos. You'd need a pretty hot big bore Mini to warrant a 45.

I have an Alfa with twin 40 dells, 1.8 litre and weighs 1200kg and it gets 33mpg on a trip so if they are set up right they will run superbly.

My Cooper 1310 with 45 weber in the 70's used to get 25mpg on a trip (but it sounded great). In hindsight it really needed an expert to set it up. I swapped it for 1.5" SU's and it went to 40mpg on a trip with only a slight drop in performance over about 5500rpm.

Pete

What he said, ^^^ generally.
However the Dellorto has a greater range of jets than the Weber, not that you need to use them all.
The mains for example go up in steps of 1- eg.
180, 181, 182 etc.
Method of operation and appearance of most parts like jets and chokes is similar, but of course, nothing is interchangeable...
Bolt spacing front and rear is same as a Weber, so they use the same air filter and manifold.
Weber are easier to get parts for here, but I buy all Dellorto bits I need from www.dellorto.co.uk as it's easier and cheaper.
I've run a 45 Dellorto for 14 years, had no problems with it. As far as power compared to Weber goes- for a street car there's nothing in it.
Currently it lives on my 1360, with 38mm chokes and an RE282 cam it pulls hard from 3000-8000 rpm.
On MRC dyno, day it outran a few Webers......

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

A whole bunch of us run 45mm Dellortos and Webers and they dont seem an overkill on a siamese port engine where each throat services 2 cylinders. If a 120hp Alpha might run a twin 40mm setup then a 70hp+ (at crank) mini seems to justify a single 45mm unit.

Dellorto 45s were apparently a popular setup on hot Escorts in the UK in the 70s - most I've seen seem to come on Ford twincam and Pinto manifolds (not sure whether it was factory supported or a dealer option or just a popular upgrade). Maseratis used Dellortos too (I think even the Bora in some versions came with a 4 sidedraught 45mm setup for the quad cam V8......I think they are all still on the cars though).

Oh and the other benefits of the Dellorto is a more reliable choke mechanism (they leak on Webers) a better internal filter and less of a tendency for the fuel to frothe up because of engine vibrations. Thats all according to Dess Hammil.