Nardi carburetor setup -> progressive carburetor?

[impaw]

Hello
I stumbled across a relatively cheap Weber 40 DCZ5 a while back.
The intention was originally to sell it, but I have been bitten by the Nardi bug.

So, does anyone have a Nardi intake, with linkage and possibly the radiator inlet for sale?
I know these things are costly, by the way  

Best wishes
Torstein

[chriswgawne]

Cavalitto sell these Torstein.....but you probably knew that anyway.
Chris

[impaw]

Yes, thank you Chris.
I have gotten a quote from Enrico, but wanted to check if anyone had a kit they wanted to get rid of:)
You never know

[Sebastien]

Have you already a "Nardi type" hot camshaft in your engine?
Also I seem to remember that you already ran your engine with a single carb on a test bench.
To fit the Nardi kit you will have to take off at least one cylinder head, to exchange the inlet headers...
So it is not just bolt on!

[impaw]

Yes, that is correct!
It ran, and it ran sweetly I think.

But, I think I will only need an hour or so to remove and refit one head.
And one advantage of the push rod design is that I won't need a retiming after removal/installation:) Always look on the bright side of life! haha

So, the work is not what is stopping me, its the cash - for now.

I have an exciting idea for the Nardi-setup that I will reveal later on.
I run a carburetor repair shop (www.flattjern.com) , and I have a huge stock of carb parts, so I have a cool modification in mind.
..totally reversible of course

More on this later!
...but I will say this: it will improve the low rev capabilities of the Nardi setup.

[impaw]

kit sourced

[GG]

be sure to change the accellerator pumps also. I think they're supposed to be 45s in the Nardi kit, and stock single carb is 85.

Also the main jets are noted as 125 in the Nardi material - we started with 145s, and then each year dropped 5 pts.

Note the Nardi setup is quite connected to some improved camshaft install, so less sure if running with stock cam.

[impaw]

thank you for the info Geoff!

[chriswgawne]

Notwithstanding Geoffs information which is of course absolutely correct, my 3rd Srs B20 which had a well sorted high revving engine engine with a very special camshaft and an original NARDI twin Weber setup had 80 accelerator pump jets and 140 main jets. I always used 98 or 100 octane fuel.
Just to confuse you Torstein!
Chris

[impaw]

haha, interesting confusion:)

I have installed a pair of lambda sensors, one on each side after the headers, with Air/Fuel meters so I can read the mixture when I get on the road.
It will be interesting to see where its at!

[chriswgawne]

I should have said it was the engine in my race car B20 which spent much of its life between 3,500 rpm and 5,500rpm.
The only discernible difference between having twin Webers and a single ( much modified) Weber on the same spec engine was better breathing at the very upper end of the rev range I used. Overall power seemed little different.
I had a Lambda sensor fitted on one side to get an idea of the combustion.
Chris

[impaw]

I intend to have the two carburettors work as one 4barrel progressive carburettor,
one of the carburettors will be the primary carb, doing all the work up until perhaps half open throttle, then the secondary carburettor will start opening its butterflies.
Ill come up with a delayed mechanical linkage, that is adjustable, so I can find the best spot for it to start opening.

On the primary carburettor I will use perhaps 25 or 26 chokes, and on the secondary carburettor I will try somewhere around 30mm chokes.
On the secondary carburettor I will delete the acceleration pump, and have the butterflies fullyclosed when not in operation.

This will emulate later carburettors like the Zenith INAT carburettor, or Holley 4barrel carburettors.
...or a pair of Weber DGV´s

If this works well, I can have the smoothness of the small choked carburettor at low speeds, and the power at higher RPM through the carburettor with the big chokes.

We´ll see how it turns out:)

Either way it will be easily reversible.

[Richard Fridd]

Very impressive, do you have experience of DCNLs as I have a set yet to be fitted, maybe to the spare engine in my Spare Engine  thread.
.
 Not that I have a spare car to fit this to.

  Richard

[impaw]

I have overhauled many DCNLs but I have not used them on any engine of my own.
Lovely carburetors to work on!

[chriswgawne]

That sounds interesting.
Did you also consider going the whole hog and fitting a period triple SOLEX setup Torstein?
Chris