 Ballpark jetting for Dellorto DRLAs?, the title says it all |
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| r3dplanet |
 Mar 20 2019, 11:58 PM
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#1
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Senior Member  Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None  |
Hello.
I have a pair of DRLA 36 carbs which shall soon be mated to a 1911cc engine. Can anyone supply me with a reasonable starting point for the jetting? So far I have found very little information in terms of jetting charts or rebuilding. Search tends to get transmogfrified into Weber results. Allow me to explain what my trouble is. You see, carburetors mix gasoline and air to just the right amount at varying conditions. Much of that is determined by a variety of jets, screws, stacks, etc. Of these I am entirely ignorant. Please and thank you.  |
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| anderssj |
Mar 21 2019, 06:03 AM
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#2
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Dog is my copilot... Group: Members Posts: 1,653 Joined: 28-January 03 From: VA Member No.: 207 Region Association: MidAtlantic Region 
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I've been running DRLA 40s for more than 25 years (2L with Mahle euro PC set, elgin cam, Bosch 050); they're set up as follows:
Venturi = 30 (factory setting is 34) Idle jet = 55 Main jet = 135 Air correction jet = 180 (same as factory) Emulsion tube = 9164.2 (same as factory) If you have 30 venturis on your carbs, this jetting may be a good starting point. I posted some old set-up articles here: http://www.914world.com/bbs2/index.php?sho...359&hl=DRLA I may have some others I can email--PM me if you need them. Hope this helps, Steve A- |
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| r3dplanet |
Mar 21 2019, 04:41 PM
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#3
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Senior Member Group: Members Posts: 679 Joined: 3-September 05 From: Portland, Oregon Member No.: 4,741 Region Association: None |
Rad! Thank you very much.
QUOTE(anderssj @ Mar 21 2019, 05:03 AM)  I've been running DRLA 40s for more than 25 years (2L with Mahle euro PC set, elgin cam, Bosch 050); they're set up as follows: Venturi = 30 (factory setting is 34) Idle jet = 55 Main jet = 135 Air correction jet = 180 (same as factory) Emulsion tube = 9164.2 (same as factory) If you have 30 venturis on your carbs, this jetting may be a good starting point. I posted some old set-up articles here: http://www.914world.com/bbs2/index.php?sho...359&hl=DRLA I may have some others I can email--PM me if you need them. Hope this helps, Steve A- |
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| porschetub |
Mar 22 2019, 12:51 PM
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#4
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
The 36's can come with 28 or 32mm vents ,idles and mains straight off will usually be close enough for a start if mixture screw are set correctly.
Make sure you balance them before doing final jet tuning,good luck. |
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