best upgrade for alfetta gtv

[carlo rossi]

the emulsion tube is fine
the air corrector is fine
you need to buy 33 mm chokes they are literally 3.3cm in diameter internal they are located in the throat itself you remove the small venturi and it is located behind this just before the butterfly
there is a retaining nut on the outside of the small venturi which will release both just reach in with your fingers and pull out!
the 33 you are referring too is the accelerator pump jets be carfeful when you put them back in look at it carefully on the side of the larger bit it  is flat if you do dont match it wont seat and almost impossible to put it back in the flat section faces outward ( not toward the engine)
where you found the 55s they are the idles they need to go to 59 if you use the larger chokes

http://www.aircoolednut.com/erkson/ttt/engine/carbs/Image17.gif

http://zsiguli.hu/images/cikk248_dhla_kicsi.jpg
the choke is number1 and 2
these diagrams should help
im interested to see what are you running in chokes the jettings are very good
it should be 32mm

[carlo rossi]

forgot to mention the 148 main jets you will also need '
So it 33mm chokes 59 idles,and
4 of each around $150 from dellorto uk

[DHDamo]

Hey thanks a bunch Carlo, that helps a lot.

I assume I have to pull the carbs off to get to the venturis/chokes as they're in the barrel? Being primarily track orientated would 34mm be worth it or too much? I have the 10548 cams.

I haven't pulled the accelerator pumps out, so I might just leave them be.

How do I get the main jets off the btm of the emulsion?  Are they threaded/pressed can't really see?

then I just combine what you said earlier:

'forgot to mention the 148 main jets you will also need'
So it 33mm chokes 59 idles,and
4 of each around $150 from dellorto uk

[carlo rossi]

ok the jet just pulls off the end ,might need pliers ( gentle)
No you dont need to remove the carbs you will see on the side the retaining nut for the secondary venturi marked 91 and 65 at the M diagram remove this and put 2 fingers in and pull
im little worried about how you new the accelerator jets without removing them?
if you pulled one out make sure it is seated right marked as 7
yes thats it really, it is that easy once you have the parts

[carlo rossi]

the specs for the 34mm chokes  are  but I  think you will be happy with the 33mm
34s will require 60 idles and 152 mains
try both the 34 is for  constant high speed
33 is for all round or tracks with tight bends

[DHDamo]

Ok, great that helps. Think I'll start with the 33's.

Didn't touch the accel pumps - hence so many questions (first).  My Autobooks Alfetta manual explains items 34 - 25 as 'choke unit' which I haven't touched yet (but your diagram 'M' clears this up). I guess it means 'actual choke with cable' which I don't use.

I owe you a beer for all these questions - thanks again!

[hammer]

Damo,

I have the Speed Pro Series book "How To Build and Power tune Weber & Dellorto Carburettors" if you'd like to borrow it.

Cheers,

Brent

[DHDamo]

Sweet Brent, wouldn't mind a read.

Is it a Jim K book?

I have the how to power tune alfas one but it's a bit too 'extreme' for my needs at the mo.

Might head up the hill in the new year if ya free.

DB

[hammer]

Damo,

Same series of books as Jim K but not one of his.

Give me a buzz on 0418 215 259 when you want to come up here for a spin. I'm kicking back into campaign mode on Jan 5.

Cheers,

Brent

[carlo rossi]

it would be interesting to see what the book recommends
can you post  the specs it recommends?
cheers

[DHDamo]

Yep, will do.

Choke is 32 currently as stock.

[carlo rossi]

yeh the 32mm choke is too small considering it was used from 1.6 up to 2.0
I think you will like the 33 nice not too much the GT approach .the problem I find with tuning books is they are either english based hence pushrod or sohc and then over the top to get the  power out  ( to sell books)
or if they are american which  really is  only for large v8s again asthmatic beasts that tear the tyres off but produce mediocre top end ( generalisation obviously . no bias at all) then you have european
which like english 4 cylinder based but  designed to sit at 200kmh plus all day
we have one huge issue we are halfway between english and euro and with that in mind the books can be more useful.
I like to think we have found the jettings that if all things were equal and they didn't have to conform to 'strict pollution laws or pander to 80 year old ( sporting none the less descerning ) ladies going shopping this should have been the setup .

[DHDamo]

Yep I like the sound of that approach.

Gonna give it a try.

[carlo rossi]

ok the best all round setup with the 33mm chokes is the 148 main jet ( standard on some australian alfas )
8 series emulsion tubes 210 air correctors, 59 idles and 2.5- 2.75 turns out on the idle mix screws ( IF IT POPS alot on deceleration screw out another 1/4 turn)
and all can be done insitu
no need for dynos or tunes as long as they are balanced
ps some of the old manuals from the 60s and 70s show you how to balance its not that hard

[DHDamo]

Just waiting on bits - chokes, mains and idles from dellorto UK. They only went back to work on Monday so next week I'm hoping. Your theory makes sense so keen to see it applied.