How to tune a 2lt

[joestram]

so you have a needl;e and seat issue
when you clean the stack can you tell
me what is the number on the air corrector thats the black end
cheers

Hi Carlo,

The number on the air corrector is 210.

Thanks Carlo

Joe


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[carlo rossi]

when you fix the needle and seat I think you are going to need larger mains
you have standard carb settings in a motor that has larger than normal cams
I need to find the specs on a 2229 pace cam
in fact I think someone has thrown on those carbs and took some other off
because its not a match you dont change cams and not jets
we will fix that

[joestram]

Thanks Carlo

[carlo rossi]

for that autodelta cam  spec you will need 60 idles
and 155/158  mains

[joestram]

Thanks again Carlo.

Do I need to change the air correction as well, or will 210 be sufficient?

Thanks

Joe

[carlo rossi]

not at this stage 210 is fine
we may look at a 180/190 later

[joestram]

Awesome - Thanks Carlo.

I've just ordered some 158 main jets, 60 idle jets, new spark plugs and leads.

Thanks again everyone!

I'll let you all know in 2 weeks (hopefully when they arrive) how the car is running!

Joe

[carlo rossi]

 the 55 idles would have given you a real flat spot around 2500rpm
and then running hot and lean
probably should mention as sportiva says in needs 34 mm chokes
check what you have
if not order
ps tried this and it works great

[joestram]

This link is not Alfa specific it is about DHLA's and is very informative

http://www.s262612653.websitehome.co.uk/DVAndrews/dellorto.htm

Thanks for posting that Sportiva.

That's a really useful write up!!

Looking forward to receiving my new bits to test out all my new knowledge!!

Joe


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[carlo rossi]

sportiva link is great to understand and is a great guide
but it is for a SOHC 2ltr with high lift cam .
so the alfa flows better down low being Twin cam hence the need for
larger idles also NOTE no 2ltr should have less than 34 chokes
Alfa cheated and put 32mm chokes in fact the carbs were straight off a 1750
motor
this is why performance between the 2 motors was marginal.
even their grp1 2 ltr cars (cheated)had 33mm chokes
it still said 32 for the scrutineers

[joestram]

Hi All,

I have just pulled the carbs off the car and realized they are DLHA40F.

For some reason I have been thinking they are 40H.

Not sure if that changes anything?

Also, Carlo has asked me about the choke size.

Is there a way to find the size without pulling them out?

I can't seem to find an inscription.

Thanks

[carlo rossi]

they are really easy to pull out if the carby is off
pull the inner venturi out using three fingers it has a spring clip pressure
and the release the retaining nut on the side for the choke to slide out
or look in you might be able to see it on the bottom

[joestram]

Thanks Carlo. I can't believe I missed it!

I was was looking at the wrong part.

They say 32 on them.

Should I increase them as well?

Thanks

Joe

[carlo rossi]

yes buy 4 X 34mm chokes
it makes a world of difference particularly
with that cam

[joestram]

yes buy 4 X 34mm chokes
it makes a world of difference particularly
with that cam

Thanks Carlo.
Just checked online...expensive little buggers!


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