Dellorto DHLA40N jetting - Alfa Romeo Bulletin Board & Forums

 
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post #1 of 7 (permalink) Old 03-06-2017, 09:38 PM Thread Starter
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Dellorto DHLA40N jetting

Help needed here please.
I've got a 1600 gt junior whose jets have been swapped out with older non emissions dellortos rendering the car virtually undriveable. Does anyone have the factory jet recipe for this application?
Thanks
Ralph.

Last edited by argtv6; 03-06-2017 at 10:16 PM. Reason: Mistake
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post #2 of 7 (permalink) Old 03-07-2017, 10:55 AM
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I guess it's a typo. DHLA40H instead of 'N' should be right. If you could post the numbers shown on the alloy metal strips, one each screwed with one of the top cover screws, we could supply you with the correct jetting data.
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post #3 of 7 (permalink) Old 03-07-2017, 12:59 PM Thread Starter
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Hi Hunttheshunt.
It's no mistake. They're 40Ns. Some previous repairer seems to have modified and fitted a later 116, 11650(giulietta) or 162(75) 1600 engine complete with these carbs but in his wisdom swapping the jets and emulsion tubes with ones from non emission Dellortos.
The carb identification plates are 5371P & 5372A. I've managed to piece together some information and succeeded to get the car very driveable this morning but I still wish to have a reference to the factory settings. Don't ask me about the engine type as the markings have been tampered with.
Thanks & Regards
Ralph
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post #4 of 7 (permalink) Old 03-07-2017, 01:42 PM
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You're right, DHLA40N's are from a 75 1.6 engine. Alfa 90 used DHLA40R's.

For N's I should have some data from the 75's workshop manual somewhere but need to digit out first.
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post #5 of 7 (permalink) Old 03-11-2017, 11:44 AM Thread Starter
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Hi Hunttheshunt.
Did you manage to find any data for these carbs please?
Thanks
Ralph
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post #6 of 7 (permalink) Old 03-12-2017, 11:13 AM
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Ralph,

sorry for late reply but what I've digged out is not including N's.
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post #7 of 7 (permalink) Old 03-12-2017, 12:24 PM Thread Starter
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Thanks anyway Hunttheshunt.
The next time I work on a 75 with N's I'll pull out the jets and take note of what I find.
BR
Ralph
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