Advise on Triple Dellorto Carbs

[toecutter]

Hi Guys,

I'm looking at buying a set of triple Dellortos from E-bay, as per description below. The seller rebuilds each set and airflow match's them. I need to decide on venturi size set up to request and size of jets/needles to be fitted. I hope to have these carbs fitted to a mild L28. Can anybody give me some approxiamtes to work with? If you have such a set up in your car please advise what you have used?

40 DHLA DELL ORTO side draft dual barrel carbs.

A TRIPLE MATCHED SET.

Complete.

professionaly rebuilt.

The italian dual barrel carburetors all -beside the solex addhe and ddh-have iron made air by pass screws.these screws have a very important factor in tunning these carbs between the 4 barrels and regulating the airflow at idle-butterflies closed position.many of these used carburetors have these little screws seized because the iron gets rusty within the seat.all the carburetors that are shipped out have these screws proffesionaly unseized and have been changed to brass air by pass screws-as the solex carburetors-that will never seize.

All the carbs are bench tested and all 6 barrels syncronized before shipment.

carbs have either consecutive or close serial numbers.

These types of dual barrel carburetors seldom need the base to be resurfaced but if anyone wants to have the job made it can be done at no extra charge.please submit this request at the time of the the purchase/payment.

The carbs can be delivered with a 30-34mm venturis setup at no extra charge.a 36mm venturis setup-even though it isnt recomended for the 40mm carbs' size can also be made-having a #150 neddle/pinvalve .if a larger needle valve is desired-it can be purchased seperately thru my other carburetors parts auctions/ebay store.

can be installed on any weber standard side draft intake manifold-suitable for alfa romeo/vauxhall/ford/triumph/bmw/Datsun,,.interchangeable with the weber DCOE and solex side draft 40 mm carbs.excellent carbs for street use.can also be used and tuned for special applications.

These carbs are famous for their high degree of fuel atomization capabilities.

The throttle lever can be delivered for a ball&joint linkage or for a cable linkage.please specify which one if you have a special request.

Parts and jets for these carbs can still be purchased and are still produced in the euro zone.

(THE WORD "EACH" ON TOP OF THE AD MEANS "EACH TRIPLE SET-3 SEPERATE MATCHED CARBURETORS UNITS ").

a triple set of these carburetors weighs 7.5-8g.

thanks

Sulio

[byunique]

I checked my Mikuni manual to see what jets came in the 40s, and would consider sizes very close to these. I would try and stick with more conversative venturi size and opt for larger venturis later if it all works out. A 36 is pretty large on a mild engine. As I recall, these sizes are similar to the 40 dcoe webers I used to have as well. I doubt you will hit everything right the first time, but heres a good starting point.

main jet 140

main air jet 180

pilot jet 57.5

venturi 32mm

pump nozzle 40

[toecutter]

Thanks byunique,

Do you think 30mm chokes would be too small for a mild L28?

[toecutter]

Well some good news I bought the carbs from the Italian fella who's been pretty good to deal with to date. I've told him to hold off on shipping as I do more research into a close enough set up for my L28. I know it won't spot on but the closer I get the less fine tuning that will be required later.

Do you think 30mm chokes would be too small for a mild L28? A lot of guys I've read about with tripples say they bog down if punched below 3500rpm and should be driven hard to keep them pulling and this is their nature!??? I was just thinking could many be running oversized chokes and jet set up for street use?

I'm thinking about requesting one of the following two set ups for the 40's I just bought,

30mm chokes

7548.3 aux venturi

7772.11 emulsion tubes

130 mains

180 air correctors

57 idles

42 pumps

or

32mm chokes

7772.3 emulsion tubes

135 mains

210 air correctors

45 idles

55 pumps

Opinions?

[240ZGL]

I got a set from him, there nice. Of course he can't build an exact set to run perfect on your engine, that has to be done in tuning with a running engine. He will be very close. This guy is considered to be one of the best.

[toecutter]

I got a set from him, there nice. Of course he can't build an exact set to run perfect on your engine, that has to be done in tuning with a running engine. He will be very close. This guy is considered to be one of the best.

240ZGL,

yer not expecting to have them running perfectly but getting the right choke size would be a step in the right direction. I think I'll go with the 32's. Glad to hear you set is working well. Can you give me some more info on the set up you have?

thanks

sulio

[byunique]

I would say 30/32 chokes should be fine on a mild L28. 30's definitely shouldn't be a problem, but can't say if a 32 is too much without knowing if you have a header/cam/headwork, etc. If anything it's possible some top end power may be sacrificed. I think the air of 210 with a 135 main is a bit large and it may be lean on the top end. I think there's a general rule to go with a spread of "50" on the air correction jet. If anything, play it a bit safe and go rich.