February 14, 2010

As promised, our jetting for twin Dellorto DHLA 40, emissions version.

NOTE: This will probably NOT WORK well for non-emission spec Dellorto or Weber sidedrafts on a similar engine.

Idle: 65 (this must be around the 45 mark if you run non-emissions series)

Air Corrector: 150

Emulsion tube: 7772.11

Main jet: 130 (probably needs to be 135 or so. Gets a little lean on high RPM)

Engine: SOHC 1300cc head worked with larger valves and mystery cam

1 1/2″ headers, 4 into 1 exhaust, 3″ secondary, high flow muffler

At the moment, got 35 degree of advance dialled in. The dizzy-less Megajolt ignition system is currently being perused as an alternative.

Industrial espionage is probably not an issue for 30 year old technology. If anyone has thoughts or comments on these figures, we’d love to hear from you.


2 Responses to “Jetting”

  1. christopher Calleja Says:

    Hi I am Chris from Malta owning an Escort Mk1 with 1600cc(1740) crossflow engine, 244 camshaft (3000-8000)revs and big valves head. I just bought a pair of dellorto dhla 40H and I need to jet them to suit the engine. Is it possible to let me know sizes of jets, chokes etc please?

  2. Dave Says:

    Have a look at in their carb forum. They seem to be really helpful in there.
    Good luck, Dave.

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