DHLA 40

[Gauthier500]

Ciao, ho molti problemi con le messe a punto di mio carburatori. Il mio motore è 700cc con un testata panda, Dellorto DHLA40 ed asse a came 595SS (40/80/80/40).

Choke diam : 30mm
Main jet : 111
Main emulsion tube : 7772.5
Air corrector : 200
Idle jet : 50
Pump jet : 40

non so che fare poiché il motore gira bene al minimo, monta in regime ma il miscuglio è troppo ricco. Avete consigli a darmi?

Grazie del vostro aiuto

http://www.youtube.com/watch?v=UAvO7wYXpaA

[Gauthier500]

Persona n'a di risposte per il mio problema?

[Domino]

Hai tutto troppo grande secondo me. Devi abbassare i valori.

Choke diam : 28mm
Main jet : 112
Main emulsion tube : 7772.6
Air corrector :162
Idle jet :40
Pump jet : 40

Prova cosi. In teoria dovrebbe andare. Almeno penso! :P
Vediamo se qualcuno conferma!

Domino

[Domino]

Tell me the exact RPM at which peak power is made (or approximate ). After, if you want it tuned for best power or flexibility. 8)

Domino

[Gauthier500]

I don't know exactly the RPM but between 5500 and 6000.

[Domino]

Ok. This are theoretical values. Anyway:

For 5500 RPM:

- POWER

Choke diam : 27mm
Main jet : 110
Main emulsion tube : 7772.8/7772.7/7772.6
Air corrector :160
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

- FLEXIBILITY:

Choke diam : 25mm
Main jet : 100
Main emulsion tube : 7772.8/7772.7/7772.6
Air corrector :150
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

For 6000 RPM:

- POWER:

Choke diam : 28mm
Main jet : 115
Main emulsion tube : 7772.7/7772.6
Air corrector :160
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

- FLEXIBILITY:

Choke diam : 26mm
Main jet : 105
Main emulsion tube : 7772.7/7772.6
Air corrector :150
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

Considerations: If you watch the values carefully, you see that they are not much various from one another. For me you must hold fixed the values of:

Choke diam : 28mm
Main jet : ?------?
Main emulsion tube : 7772.6
Air corrector : ?------?
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

For main jet the possible values are: 105-108-110-112-115
For Air corrector the possible values are: 150-155-160

If you have time, you can play with this values for have the best compromise.

I theoretically would make:

Choke diam : 28mm
Main jet : 110
Main emulsion tube : 7772.6
Air corrector : 155
Idle jet :40/7850.2
Pump jet : 30/35
Aux Venturis: 7848.3

Maybe, before adopting this solution definitively, try different values of main jet/air corrector. Another precisation:

<------------------------ Idle airs --------------------->

weaker--------------------normal----------------richer

7850.5---.10---.9---.4---.1---.3---.6---.7---.2---.8

I tell to you to put the 7850.2 (rich). If it will be too rich, lower it.

It's important that you make tests in order to find the just compromise. After, you should control the to see the color of sparking plug for understant the type of carburation/combustion. This is very important for see if the carburation is weak/poor or rich.

Good work and good luck!

Domino

[Gauthier500]

Thank you for your answer, I will test the settings and i tell you the results.

[Domino]

Ok. Tell me the results but more than this i don't know about the DHLA 40. With this councils, i think that you can do it!

Domino

[Gauthier500]

My DHLA (no marks) is a emission performance type.

[Domino]

Sorry but i don't understand the type. In wich car it was mounted?

Domino

[Gauthier500]

There is 2 types of DHLA :

emission control => DHLA F,G,H,L and N
non emission control ou unvirsal performance => DHLA C,E and no suffix


I have a DHLA no suffix, it's the rarest and the best for "race engine"

[Domino]

Ah ok! I think the setting are the same....also, in the internet parts shop, i nevere seen the difference for the two type so i think the spare are the same.

Domino

[Gauthier500]

http://www.youtube.com/watch?v=ph6TH-Vcr9w

[Enzo]

Devo smettere di bere non riesco piu' a leggere l'italiano.

[Domino]

Eh! Prova a vadere se fuonziona!

Domino