Dellorto Rebuild project settings

[Ciridean 1]

Hi All: The time has come to rebuild my carbs on my 85 Esprit Turbo U.S spec. I was able to remove the carbs by pulling the entire manifold off with them, much easier than trying to reach the nuts underside, as they turn, slowly, slowly then hit the engine, aaarghhh. Anyway, I am paying someone to rebuild them as the other options did not fix my running problems. Does anyone know what the:

1. Idle mixture screw settings are

2. The float settings

3. The float drops are supposed to be?

He needs this info before the rebuild. I looked through the site but could not find it, plus in my Wes Hammil book but  I assume these settings are specific to the model. Many thanks in advance. Lee

[johnpwalsh 1,326]

On 24/09/2018 at 06:14, Ciridean said:

Hi All: The time has come to rebuild my carbs on my 85 Esprit Turbo U.S spec. I was able to remove the carbs by pulling the entire manifold off with them, much easier than trying to reach the nuts underside, as they turn, slowly, slowly then hit the engine, aaarghhh. Anyway, I am paying someone to rebuild them as the other options did not fix my running problems. Does anyone know what the:

1. Idle mixture screw settings are

2. The float settings

3. The float drops are supposed to be?

He needs this info before the rebuild. I looked through the site but could not find it, plus in my Wes Hammil book but  I assume these settings are specific to the model. Many thanks in advance. Lee

Hi Lee. depending on which floats you have the following might help.

Float gap on 10G floats are 17mm.

Fuel level in chamber for 10G floats. 27mm.

 

This may also help you out.

https://www.theapplebyclan.com/Richard/Tiger Super6/Useful info/Dellorto/

 

[gvy 379]

Hi ,

about float setting :

You may  consider  handing over the info in this link to your mecanic:

http://sideways-technologies.co.uk/forums/index.php?/topic/1048-setting-dhla-dellorto-dellorto-float-fuel-level/

I used this method to set the floatlevel of my dhla carbs ( esprit s2.2 ) years ago when I refurbed the carbs myself, and a month ago, I inspected this setting ( still spot on) . The car always pulled clean, without hesitation.

Edited September 25, 2018 by gvy

[910Esprit 531]

14.5 - 15mm float height all turbo variants.

Not seen 'float drop' specified 

There is no 'idle mixture setting'  you are aiming for 0.8% CO hot idle  (good luck....).   For a UK model, I find 3 full turns is a good starting point

[Ciridean 1]

Many thanks to all, Geert, John Walsh, and Steve, once again this forum has come through for me.Sorry for the delay in thanking you all  I was out of town for a family semi-emergency, but back now to tackle it. 

[drdoom 396]

Regarding fuel level check method there is an American chap, Keith Franck, who pursues the technology in these side draught carbs with rigorous methodology. He recommends cutting a piece of printer paper into a "T" shape, its vertical leg's length adequate to reach from carb body top to immersion in the fuel, and its width somewhat less than the inside diameter of the jet well. The paper is to be marked on the vertical leg at a specified distance below carb top so that when inserted into the well the wetting by fuel is easily seen to show precise level after the system has been run. Dead simple, effective and more certain to assure precise levels than the traditional methods.

Cheers

[Steve4012 190]

That's sounds a really good way of getting the fuel level right. Do you know any measurements from the carb top to fuel for the various models and particularly a UK model turbo esprit? 

 

[drdoom 396]

KF advises 22mm from carb body to static fuel level for the 40DHLA. Don't imagine there's a different figure for the 45's as the 22mm figure is in order to target fuel level at 2mm below entry to the duct feeding fuel out to the auxiliary venture, and I presume that Dellorto would have persisted with that dimension through the range. No advice directly addressing the Turbo applications here, however it seems that the design measures pertaining to pressurized operation would stand as separate from other fundamentals of carburetion.

[johnpwalsh 1,326]

On 23/12/2018 at 21:20, drdoom said:

KF advises 22mm from carb body to static fuel level for the 40DHLA. Don't imagine there's a different figure for the 45's as the 22mm figure is in order to target fuel level at 2mm below entry to the duct feeding fuel out to the auxiliary venture, and I presume that Dellorto would have persisted with that dimension through the range. No advice directly addressing the Turbo applications here, however it seems that the design measures pertaining to pressurized operation would stand as separate from other fundamentals of carburetion.

I thought it was 27mm, not 22.

[drdoom 396]

I have reviewed the files which Keith posted on his forum regarding DHLA and it is from those that I have reported the 22mm figure. I'll attach a PDF drawing in which this is addressed, for reference. Note that this will illustrate his alternative form "VF" emulsion tube, for which a patent as been applied as I understand.

Cheers

VF-tube_in_DHLA_Well_22mm_Fuel_Level.pdf