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Hi, New to the forum, hope someone can help me with a query. There are three different throttle plates fitted to 45 DHLA carburettors. I am wondering what the correct throttle Plate is for a a "C" model. The "C" model is the 6 progression hole model with enclosed idle screws. I have purchased a pair and they have the throttle plates with the flutes cut in them that are the ones use don the standard DHLA three progression hole models. It looks wrong to me as the first progression hole is partly uncovered when the throttle plates are closed, I think the plain throttle plates with out flutes should be fitted? Can anyone confirm? Cheers, mike

Hello, I have encountered a lot of problems the past year that i 've owned the car... I finally set the floats as good as i could. The front is at 12mm and the rear at13mm I also threw the floats in to see how much the liquid lifts. The two LOW points of the carbs are in the side of the idle jet on the first cylinder and at the same spot on the third, so a set them with this in mind. The engine sits like so... The rear carbuetor is a bit tilted inwards. The manifold isn't the best craftsmanship you will see. I have a basic setting now which means closed butterflies, idle steady and low, by pass closed and the mixture screws at 2.5 turns from fully closed. My problem is that the mixtures are non responsive... 2.5 turns or 5 turns is the same. If fully seat them on all 4 cylinder its the same. And the engine doesn't shut off also. I tried some idle jets 55 drilled. It must be now 60-61. The same non responsive mixture. May be unrelated but when coasting at this state of course i have a bit of backfire from the exhaust and on downhills when i brake the engine shuts off. This may be related to the floats that why i am stating it. The manifold is inspected with new flanges so i don't really expect to have a vacuum leak. The carbs can be synchronised with no problem with a tool such as carbtune. I also run a mechanical fuel pump which give a steady 2 psi pressure. The compression of the engine per cylinder with a cold engine was 215, 225, 225, 225 from 1st to 4th. I have also rebuilt them and there is the biggest mistake i made. I bought for half the money the budget rebuilt kit which has needle valves for the trash. So i put back the dellotro oem valves and seats and they seal perfectly as it was tested along with the floats. Generally despite all these fact the engine runs very nice with good progression since i set the floats as it is. The specs of the engine are : toyota 7K 1781 cc Dellorto 40F from alfa romeo Butterflies 7481.3 Venturi 32 Aux venturi 7848.3 Main jet 145 Emulsion tubes 7772.8 Air 210 Pump jet 33 Idle jet 50 Float 7298.1 gr10 Needle valve 150 Stock alfa specs apart from the idle jet which was originally 55... Please help before i sell it Thank you.

HI THERE EVERYONE, CAN ANYONE OUT THERE SUGGEST JETTING FOR A 1292cc PORTED N POLISHED, 328 CAMMED , BIGGER INLET VALVED ENGINE. AT THE MOMENT IT HAS A LARGE STUTTER IF I MASH THE ACCELERATOR FROM LOW TO MIDRANGE, IF GENTLE IT IS OK. ALSO LACKS A LITTLE AT TOP END IN 3rd AND 4th. WOULD UNIVERSAL PERF BE PREFERABLE TO E's I USE THE CAR ON ROAD AND FOR HILL CLIMBS. CURRENT SETUP DHLA 40 E 33MM CHOKES 124 MAIN 200 AIR CORR .5 EMULSION 45 IDLES 33 PUMPS MAX RPM 8K 1st 2nd MANY THANKS, DAVE

Hi all, I'm looking for 2 fresh choke pistons for Dellorto DHLA 40. Pls contact me here or by email magnus.vikingstad (a) gmail.com Best wishes Magnus