This topic may have been covered before, but I thought I would open a pandora's box.
What is the general view of Weber's vs Dellorto's?
Pro's & con's of both?
Can't run injection in the class I will be racing in ( just to cover that suggestion).
 
Thanks
Craig

I run delortos and after sorting the jetting out I find then quite good, when someone who knows there stuff tunes them, having said that I have never run webbers

Weren't you looking to use bike carbs?

Matt

Suttonmotorsport

This topic may have been covered before, but I thought I would open a pandora's box.
What is the general view of Weber's vs Dellorto's?
Pro's & con's of both?
Can't run injection in the class I will be racing in ( just to cover that suggestion).

Thanks
Craig

 
Hi Craig
 
Based on my experience,
 
When they are both prepped correctly, very little difference in overall performance, almost identical. 
Off the shelf the dellorto has a slight advantage in power/flow because of the aux vent design and venturi shape.
 
With either you need to have early carbs preferably, on dellortos pre pollution units with 2-3 progression holes (usually nothing after the 4*DHLA, NOT 4*DHLA-G or -H), in webers same deal on progression holes and prefix DCOE13 or DCOE9 as a preference. Other models in both are ok (some more than others) and can be made work.
 
Parts for dellortos are much harder to source.  There are sub standard parts available for both, be careful what parts you buy and where you buy them.  Pay particular attention the the way the emulsion tubes and jets are drilled.  Use genuine parts wherever you can.
 
Cheers,
Warren

Hi All,
I used bike carb's on my old car which I have since sold, but need to use either Webers or Dellortos on the next build due to class regs.
The bike carbies were excellent, but will not be in keeping with the "historic" escort that I am building.
I have used Dellorto's before with sucess and have had experience with Weber's.
As I am in no rush to buy a set, I will keep my options open.
Thanks to all for the responses.
Cheers
Craig
 

Dellorto's have a number of better features than Webers:
Externally adjustable pump jet stroke.
Aux venturi's as already mentioned.
Far more calibrated parts - Weber goes up .05 Dellorto on some items will have every size in between.
 
The advantage of the additional calibrated parts is there is no compromise necessary in jetting. This is only an advantage though if the engine your tuning is in good enough condition to be able to see the difference.
 
The next issue is calibrated parts aren't always readily available.
 
Also a number of historic classes can't run them as they can only use what was available in the period.

I used the dellortos (40DHLA's) on my original engine build after doing a lot of research about them and webers and yes they are supposed to be slightly better flowing with slightly better fuel atomisation, down low response etc etc.  HOWEVER parts for them were/are nowhere near as easy to get as webers and most dyno shops even 10 years ago did not stock Delorto jets emulsions etc, so when I upgraded I went for weber 45DCOE13s.  Weber parts are easier to come by and tuning them is more widely known than the Dellortos (Even in this day and age of fool injection!).  BUT once the carbies are tooned (properly) then they work very well.  I now have the autocross Pinto engine with the same 40DHLAs that were tuned properly for the cam by Datrally (shows how long ago they were set up) and they are the 5 "shotgun" progressions that are more difficult to tune.
 
That said I sought out 45DCOE13's specifically when upping the cam and breathing on the race engine having "learnt" from my Dellorto experience and reccomendations from real people and the ones dyno tuning the car.  This engine is in a higher state of tune so cannot compare older DHLA carby characteristics, butt getting the "right" emulsions, jets and aux venturis to initially set them up was quite easy for Webers.....  I have been building up another engine with 45DCOE152s, so my vote is then 2:1 in favour of Webers - mostly due to ease of getting the right/replacement parts for them - But once setup, I not sure there would be much to choose between as unless you are constantly changing cams and other parts, you should not need different part for the carbs after being properly setup.