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Showing results for tags 'dhla'.
Found 5 results
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I am struggling to setup a pair of Dellorto DHLA Emission carbs. Engine is a Vegantune Twincam VTA, 1700cc 8-valve running “sporty†cams. At the moment it starts well (have disconnected the choke arrangement, it doesn't seem to help, just makes a loud whoosing noise when operated) and will idle at around 700rpm when it gets up to about 70/80 deg. The engine will not pull or cruise below 2000rpm and it is running lean throughout the range, plugs are nearly white, very small amount of soot after idling. Vacuum advance is currently connected although have run without some of the time with no obvious difference in performance. It does seem to be relatively happy above 4000rpm, suggesting the progression range is the problem. The consequence of running lean appears to be some overheating, gentle throttle and no static idling for any time is needed to keep temperatue below 100deg C. On acceleration the noise is strangely raucous, hard to describe and not, I think, attributable to the exhaust setup. The carbs setup is: 0 DHLA “H†and “Nâ€, ie the emission carbs. Idle – 62 with the emission holder Main 145 Air Corrector 200 Emulsion 7772.11 Chokes 34 Auxillary Venturi 7848.1 Float level in carbs – as far as I can measure about 28mm from top of tower on engine side. Floats set at 16.5mm. Ideas welcome!
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How do you establish the correct needle valve seat size for an engine? |Is it based on the predicted maximum fuel need in L/min and how critical is it? Want to ensure I have the correct size.
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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
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In my ongoing quest to solve the hesitation that is affecting my Lotus Excel, I've noticed that the nut + locknut which set the accelerator pump stroke are in different positions on the two carbs. There looks to be about 2 - 3 turns difference between them, and as far as I know they have never been adjusted. I borrowed a pump tool and the volumes all seem to be even, 7cc +/- 0.5cc. However, I'm wondering whether one pump is starting to operate before the other, and if it might be causing my problem - the engine runs smoothly at a constant 1800 - 2000 rpm, the hesitation only starts when I accelerate. The Des Hamill bible says thou shalt not adjust thy pump strokes, but I've fitted an overhaul kit which included new diaphragms, so surely after this some adjustment may be needed? Should there be any free play between the end of the pump actuator arm, and the brass plunger attached to the diaphragm? Or should it be resting against it under non-accelerating conditions? Thanks for your thoughts...
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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
