Dellorto

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Revision as of 10:30, 1 June 2011

Dell'Orto carburetors from Italy their DLHA series were fitted to the Datsun 1200 SSS model. Dellorto made other types, but the DHLA fit the common DCOE intake manifolds.

http://www.dellorto.com

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The DHLA & DRLA carburettors are widely believed to be the most sophisticated carburettors of their type, prompting David Vizzard to say in Auto Performance magazine, “Dell’Ortos produce truly excellent results...On engines where atomisation is a premium requirement, Dell’Ortos are superior to everything”.

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The last Dellortos were made for the Lotus Esprit Turbo. Production ceased in 1992 due to lowered demand for carburetors in the face of EFI.

Source

Dellorto DHLA may be purchased from Eurocarb at http://www.dellorto.com

Tuning

SSS DHLA40 jetting specs

Venturi: 28mm

Main jet: 115

Needle and seat: 1.50

Float: .01

Starter jet: 70

Starter emulsion tube: .01

Idle jet holder: .01

Idle jet: 50

Air corrector: 200

Emulsion tube: .01

Aux venturi: .01

Pump jet: 33

Pump delivery: 7.5

To suit SSS A12 engine with mild rally cam (see specs in SSS section) and 4-2-1 tubular headers

Also see: http://www.gruntled.com/Dellorto/

NOTE: When removing and re-inserting the Pump Jet, be sure to line up the passages. See http://www.gruntled.com/Dellorto/PumpJet.html

1. Choose DHLA 40 for A-series engines
   1. Or DHLA 45 for larger engines
2. Choose appropriate venturi size, perhaps 26mm is best for stock A12 engine
   • Available from 25 mm to 37 mm in increments of 1mm
   • Part number 8383.25 to 8383.37 at Eurocarb
   1. Auxiliary venturi from size 1 to 4
3. DHLA Starter -- tuning for cold starting
   1. starter jet sizes from 48 (3315.48) to 105 (3315.105)
   2. starter emulsion tube 1 to 4 (7482.1 to 7482.4)
4. Accelerator Pump
   1. Pump Jet sizes 33 to 60
   2. Pump rod adjustment. Screwing the nut tighter increases fuel delivery, turning it anti-clockwise reduces delivery.
      • Combination of Jet and tightness works 1) Time, shoot for 1 second 2) volume. Probably twin carbs will be within 1/2 turn of each other to deliver the same volume. Test this by actual measurement using a CC vial.