Very little difference really, between a Dellorto and a Weber of the same type. On the road a Dellorto is as good as a Weber, on the track I'm not sure. If jetted right I think probably there's SFA difference.

Main operational difference is a Weber has a piston type accelerator pump (like yer HQ Holden) while Dellorto uses a diaphragm. They both work....

Dellorto stopped making carbs for cars a while back, but you can still but Weber new if U got $$$.

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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.

just out of interest.....are there any holley carbies that would work on an A-series?

I've seen a 28/36 DCD compound Weber fitted to an A series but never a Holley. The Weber DCOEs and Dellortos we're talking about here are nothing like a Holley...

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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.

yeah i knew holleys are quite different, just i was looking at a street machine mag (almost everything has a v8 with a holley) and i wondered if any would work on a mini

what is the difference between a DCOEwebber/DHLA delorto/SU to a holley?

This will be brief- I haven't got all night...
There's a lot more to it than what I've written below. Buy a book on carburation if you want to learn lots..

Weber DCOE, Dellorto DHLA, Solex PHH are 2 barrel (aka `choke') sidedraft carbs. Fixed size jets with several fuel circuits per barrel.. Basically 2 identical carbs in one body. Both throttles open together. Normally used one barrel to each inlet port.

SU is a sidedraft but can be used up to 30* angle. Single barrel, constant vacuum carb. Uses a single jet and a needle to vary fuel flow. Used 1 per port (all Coopers) or 1 to feed both ports (stock Mini).

Holleys vary in design, are all down drafts, but a 4 barrel Holley used on V8s has 2 primary and 2 secondary barrels. The small primary barrels work together up to around 1/2 throttle then it opens up the biggies either by vacuum or mechanically. They do work OK on V8s or Chrysler 4.3L Hemis.. but are way too big for yer Mini..

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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.

thanx doc....yeah i once read up on them a bit.... but that was ages ago.
what you said does sound very familiar though.....cheers

-jimmy

Doc I was told that the post polution Webers are a pain to tune right and was advise to get only the pre polution (ie 45DCOE13). What does Hamil or your experience say about the post polution Dellortos and what 45DHLA model is the right one?

Mike,
There are some emission 40DCOE Webers where the idle bypass circuitry is fixed and cannot be adjusted. These are a PITA according to Hammill.

All the 40DHLA Dellortos I've seen (off Alfa 2000s) have screws so you can shut this feature off. But Hammill says it is handy to have this adjustment as you can better equalize idle mixtures.

Main other difference compared to early (desirable) ones is they have more bleed holes in the progression circuit. So progression from idle is a bit leaner.

Hammill does say on p9- "No competition engine should ever be equipped with an emission type Dellorto or Weber 40mm carburettor"

Take out the cover screw for the progression holes- if it has 2x or 3x 1.0mm holes in there it is the early type (GOOD!) if 5 larger (2.0mm) holes it's an emission carb. Not as good...

This doesn't mean you can't use them though. Cheap to buy and try...

My Dellorto is just marked DHLA 45 and has no bypass circuits. Dunno what it's off..

<re-edit> , 'coz I f**ked up the numbers..
Dellorto DHLA 40 `C' and `E' are pre-emission, but the F, G, H, L & N are emission ones according to Hammill. Best one is DHLA 40 (no suffix).
With Webers, he says 40DCOE 11 and DCOE 2 are the ones to have.

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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.

these are dellortos with plastic jet covers on the top of the carb

this is the weber with brass/ steel jet covers on top of the carb .

and this is the solex side draught carb with rorary choke on top.

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lookin for another clubby

yeah they're all pretty similar hey?!?!

if you are going to a wreckers take the pix with you. chances are you will be looking at either a dellorto or solex as not many webers were fitted as standard. if you look closely at each carb it will say dellorto, solex or weber on it

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lookin for another clubby

As far as I could gather the Dellortos with yellow plastic are the emissions ones and are not as good.

All Dellortos have yellow plastic that I've seen. Even my `good' non-emission 45...

<EDIT> OOPS!... Just took mine off and it's BLACK so yeah, maybe you're right..

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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.

mine isnt and it hasnt been painted either
how do i tell if its the pollution carb kev ?

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lookin for another clubby

Any numbers on yours, apart from `Dellorto 45DHLA'?

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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.