Setting up single DCNF on our X

[karhawk]

Anybody care to suggest a base line carb jetting and and choke size for our X?

Faza DCNF intake manifold custom ported to 29.5mm intake runners
40 mm DCNF with choice of 30 or 32 chokes
new 1500 euro lancia short block
79 1500 carb head with big valves (40mm intakes)Isky springs
A16 Pittatore/Alquatti cam
shaved head 60 thousands
lightened flywheel
elec. distributor
4-1 header with custom 2.25" exhaust

thanks

Chris
Oakland, ca.

 

[duderduderini]

get in touch with fiatfactory

hey
What Steve C doesnt know about this isnt worth knowing.. there are other guys here too but I dont recollect who.
Good luck
Nick

 

[fastx19]

Some ideas

Here is Courtney's page on it. http://www.mirafiori.com/~courtney/128/tech/dual_carbs_config.html

Let me look at my notes from my old race car. I have the jetting written down somewhere for the single 40dcnf I use to run on it. However, I had higher compression so you will need to adjust for that.

Eric.

 

[Lafayette Bruce]

Single Carb

Notice that the Courtney's spreadsheet is catering to dual carbs. I have a single DCNF on a 1300 with a PBS big valve head, S1 cam and Alquati intake manifold. I have still been tweeking but here is what I have in right now which seems to be close:
Main Venturi 30
Emulsion tube F30
Air correction 200
Main jet 145
Idle jet 70

Have fun,
Lafayette Bruce

 

[karhawk]

Thanks
so with my 1500 bigger mains and airs?
I'll stick with the 30mm chokes for now.

Chris

 

[fiatfactory]

Go with the smallest chokes, even 28's if you can get them... remember you've got just one cylinder at a time drawing from both venturis... not like a IR setup where one venturi feeds one cylinder.

You could even go leaner than 145's too, I would start around the 130/135 mains.

F24's E tubes too...if you have them.

SteveC

 

[karhawk]

OK

I have some starting #'s

From Paul Stoltze's race prepped 1300 SCCA GP rules
32 chokes
f24 emulsion tubes
180 airs
160 mains
70 idles

Lafayette Bruce's street prepped 1300 with BV head and cam
Main Venturi 30
Emulsion tube F30
Air correction 200
Main jet 145
Idle jet 70

Steve C from down under says
Go with the smallest chokes, even 28's if you can get them... remember you've got just one cylinder at a time drawing from both venturis... not like a IR setup where one venturi feeds one cylinder.

You could even go leaner than 145's too, I would start around the 130/135 mains.

with F24's E tubes

Thanks everybody
I will give it a go and report back

Chris
Oakland, Ca.