 Dell DRLA 40 question, Dell experts please chime in (now with photo) |
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| bobhasissues |
  Feb 17 2010, 08:47 PM
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#1
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seemingly endless issues with my 914  Group: Members Posts: 218 Joined: 13-February 07 From: Chicagoland Member No.: 7,532 Region Association: None  |
Just got a pair of NOS Dellorto DRLA 40's.
These carbs do not have the air bleed screws for synchronizing. The ports are there, but they do not look like they were drilled or tapped for the air bleed screws. The date stamp on the bottom of these carbs show 7/93. I inserted a small hose in the port and could not blow any air through. I'm convinced they were never drilled. I tried to get a photo inside the barrels to show that port is not drilled through, but couldn't get a clear view. Did all DRLA's have the air bleed screws, or were they just on early models?  |
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Replies(1 - 8)
| craig downs |
Feb 18 2010, 02:59 AM
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#2
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Senior Member Group: Members Posts: 768 Joined: 25-November 05 From: mira loma ca. Member No.: 5,189 Region Association: Southern California |
Hmm mine have the by-pass screws right next to the idle mixture screws on both pairs I have.
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| ME733 |
Feb 18 2010, 07:12 AM
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#3
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
.........SHOW a side VIEW of the carburator(s) where the adjusters are supposed to be..............So we can help you......M.M.
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| bobhasissues |
Feb 18 2010, 07:20 PM
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#4
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seemingly endless issues with my 914 Group: Members Posts: 218 Joined: 13-February 07 From: Chicagoland Member No.: 7,532 Region Association: None |
bump
photo added |
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| ME733 |
Feb 18 2010, 07:35 PM
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#5
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
..........Thanks for the photo, it helps.....I have never seen this before eighter.The bypass air screws are just not there.....Well maybe this IS an update from the factory.....Do take note however .....most of the installation and tune up instructions, adjustments, I have read, WANT the Idle bypass screws --SCREWED IN ALL THE WAY.....This effectively disables the AIR BYPASS SYSTEM anyway.(rendering that part of the system useless anyway)....With the proper venturis, air correction and main jets the carbs will run just fine.........M.M.
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| bobhasissues |
Feb 18 2010, 07:48 PM
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#6
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seemingly endless issues with my 914 Group: Members Posts: 218 Joined: 13-February 07 From: Chicagoland Member No.: 7,532 Region Association: None |
QUOTE(ME733 @ Feb 18 2010, 07:35 PM)  ..........Thanks for the photo, it helps.....I have never seen this before eighter.The bypass air screws are just not there.....Well maybe this IS an update from the factory.....Do take note however .....most of the installation and tune up instructions, adjustments, I have read, WANT the Idle bypass screws --SCREWED IN ALL THE WAY.....This effectively disables the AIR BYPASS SYSTEM anyway.(rendering that part of the system useless anyway)....With the proper venturis, air correction and main jets the carbs will run just fine.........M.M. I've read the same things about tuning, I don't have a four port mercury gauge anyhow. I just want to validate these are authentic. I was very excited to find them. They are brand spanking new (sitting on a shelf for 17 years) still in the Dellorto packaging. |
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| sean_v8_914 |
Feb 18 2010, 11:28 PM
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#7
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
yes, Dells are THAT good.
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| craig downs |
Feb 19 2010, 01:42 AM
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#8
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Senior Member Group: Members Posts: 768 Joined: 25-November 05 From: mira loma ca. Member No.: 5,189 Region Association: Southern California |
Congrads on scoring the brand new Dells. I was a die hard Weber guy and hated Dells until I was told and convinced that Dells were better. I got a pair even though I had a pair of 44 Webers and found out that they are indeed better especially in the progression circuit.
In your pic the ports you have circled aren't the air by-pass. They are the ones right next to it. You usually don't need them and just leave them closed. |
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| bobhasissues |
Feb 19 2010, 08:28 AM
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#9
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seemingly endless issues with my 914 Group: Members Posts: 218 Joined: 13-February 07 From: Chicagoland Member No.: 7,532 Region Association: None |
QUOTE(craig downs @ Feb 19 2010, 01:42 AM) In your pic the ports you have circled aren't the air by-pass. They are the ones right next to it. I understand that, what I'm missing are the air bleed screws. The air bleed screws are designed to be used with a four port gauge to fine tune the air by-pass so the carbs are exactly balanced on each barrel. Like Webers, you can just leave the air by-pass closed, but Dells had this nice added feature where you can actually tune them in with the use of the four port gauge rather than on a flow bench. It's a feature most never use, they just get them close with a snail, but I was curious to know if others had Dells like mine where this port was never even finished. |
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