can anyone give me some clues on setting up my webber (venturies, jets, screw adjustment)
dncf 40
TP1600
pointless 009
gt40 coil
empi monza pipes
breville Slammed & Awesome Dubber
80 posts · joined Jun 2003 ·
webber dcnf 40 settings
Bizarre Moderator The artist formerly known as blue74l
12,789 posts · joined Aug 2002 ·
http://www.redlineweber.com/html/Tech/Table_of_contents.htm
and
http://www.aircooled.net/gnrlsite/resource/articles.htm
Rough rules of thum
Main Jet is 4.1 x venturi
Air is main + 50
Idle is whatever "best lean" is - nothing else
Venturi is approx you inlet valve less a bit or even equal
Venturi moves power up and down the rev range.
32 vent makes power at higher revs than 28
A stock 35/32 valved head should have 32 vents. A 40/35 head 36 vents
For example - MY engine
Stock heads = 32 vents
4.1 x 32 = 131. = i am running 130 mains
Add 50 and my airs are 180
Idles. For "some" reason all the reading you do says idles should be 50 - 55.
I ran 50's and it backed fired. I have 40's in there at the moment and "best lean" is 1 1/2 - 2 turns out. I will play over Xmas and see if i can tune at least some 45's in there or maybe 50's if i cahnge E's
Emulsion Tubes = Black Art
NO rhyme or reason with these that i know of
99% of people say F11's for IDFs.
My Alfa IDF's came with F57's and i know people who say F2's will fatten up your idle jet.
I need to get my idle fatter as the 40 works well but tends to clog.
This is for dual 2bbls not a single situation.
Singles are harder to set up but generally about a size or 2 larger on things
and
http://www.aircooled.net/gnrlsite/resource/articles.htm
Rough rules of thum
Main Jet is 4.1 x venturi
Air is main + 50
Idle is whatever "best lean" is - nothing else
Venturi is approx you inlet valve less a bit or even equal
Venturi moves power up and down the rev range.
32 vent makes power at higher revs than 28
A stock 35/32 valved head should have 32 vents. A 40/35 head 36 vents
For example - MY engine
Stock heads = 32 vents
4.1 x 32 = 131. = i am running 130 mains
Add 50 and my airs are 180
Idles. For "some" reason all the reading you do says idles should be 50 - 55.
I ran 50's and it backed fired. I have 40's in there at the moment and "best lean" is 1 1/2 - 2 turns out. I will play over Xmas and see if i can tune at least some 45's in there or maybe 50's if i cahnge E's
Emulsion Tubes = Black Art
NO rhyme or reason with these that i know of
99% of people say F11's for IDFs.
My Alfa IDF's came with F57's and i know people who say F2's will fatten up your idle jet.
I need to get my idle fatter as the 40 works well but tends to clog.
This is for dual 2bbls not a single situation.
Singles are harder to set up but generally about a size or 2 larger on things
Futue te ipsum!!!
Grunk Learner Dubber
18 posts · joined Dec 2003 ·
Sounds like similar setup to mine although I have mild cam.
I run 60 idles, 140 mains, 200 airs. Make sure your timing is about 30 adv at 3000+rpm. Set idle at about 850 - 900rpm. Screw in mixture until engine starts to stumble, then out again about 1.5 - 1.75 turns. Don't know much about venturis (take heed of Blue). I note you have a GT40 coil and pointless 009 - does this mean you have a compufire or pertronix fitted? I'm arranging to get one courtesy of BuggyBrad and was wondering if the GT40 has a ballast resistor in it or have you done something external? (I know nothing about this stuff but am trying to find out). 🙂
I run 60 idles, 140 mains, 200 airs. Make sure your timing is about 30 adv at 3000+rpm. Set idle at about 850 - 900rpm. Screw in mixture until engine starts to stumble, then out again about 1.5 - 1.75 turns. Don't know much about venturis (take heed of Blue). I note you have a GT40 coil and pointless 009 - does this mean you have a compufire or pertronix fitted? I'm arranging to get one courtesy of BuggyBrad and was wondering if the GT40 has a ballast resistor in it or have you done something external? (I know nothing about this stuff but am trying to find out). 🙂
breville Slammed & Awesome Dubber
80 posts · joined Jun 2003 ·
will adjusting those screws 1.5 turns make my fuel economy worse.
the main reason for looking at it is poor econmy. having said that i want get up and go when i put my foot down
i currently get around 9 k/l
the main reason for looking at it is poor econmy. having said that i want get up and go when i put my foot down
i currently get around 9 k/l
Grunk Learner Dubber
18 posts · joined Dec 2003 ·
Not too sure what fuel economy I get but it is still pretty p poor. Mixtures probably more likely to end up nearly two turns out than 1.5 - I just mess with them until the revs are at about the "right" spot - nice, clean sounding (it does seem to make a difference with economy, but not huge). Good luck 🙂