Author Topic: carb questions  (Read 4015 times)

dgdogz

  • 200BHP Senior Member
  • ****
  • Posts: 447
    • View Profile
carb questions
« on: 11:42, Thu 10 July 2008 »
on the carb...how any screws are there???
1 on each side or ????
and if there is one on each side....which one does what????
cheers ladsssss

whitneyd

  • 200BHP Senior Member
  • ****
  • Posts: 160
    • View Profile
(No subject)
« Reply #1 on: 13:55, Thu 10 July 2008 »
Can you be more clear on what your asking?
1995 Escort Cosworth
1994 Renault Express GTT

Ash-Lee

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 4208
    • View Profile
(No subject)
« Reply #2 on: 15:55, Thu 10 July 2008 »
Do you mean mixture/idle screws?

There both on one side of the carb, on the left if your looking at the car from the front.

dgdogz

  • 200BHP Senior Member
  • ****
  • Posts: 447
    • View Profile
(No subject)
« Reply #3 on: 13:36, Fri 11 July 2008 »
sorry yeah th mix/idle screws
just confused as to what one does what???
basically after i had done replacing all the hoses...the cars revs wer really
i put it down to air leaks from the old hoses being totally rubbish???????is this a possibility?
the car was sitting really high revs...around 1500 or touch more.
i turned what i thot was th idle speed screw down so now its sitting a bit lower...but due to me not really having much of a clue i was wanting to double check with some ppol on here if what i did was right or wrong
hahaha
and wether or not i need to corect it
d

vulpyfox

  • 170BHP Member
  • ***
  • Posts: 70
    • View Profile
(No subject)
« Reply #4 on: 13:55, Fri 11 July 2008 »
hi there ^^ the idle speed screw is on the side of the carb where the throttle cable links to the tangent thing [woo i sound so technical dont i?...not!] hehe well its that side and should have a little clip on it to prevent it winding or unwinding on its own. though you can adjust it with the clip in place ^^ . the fuel mixture screw is located around abouts where the anti perc fan nozzle points.. and sits about 45 deg angle downwards with a brass sunk screw [dont get mixed up with the surface fit brass screws]

hope thast helps
^^vulpyfox^^

gtturb

  • 170BHP Member
  • ***
  • Posts: 74
    • View Profile
(No subject)
« Reply #5 on: 14:23, Mon 14 July 2008 »
My car used to idle at around 2000 at one point after it had been revved/I'd pulled away. This was because there was a valve or something like that missing from the choke on the carb so it was sticking on/staying open (It was the part that is attached to the choke cable)
RTOC - Amber5GTTurb

dgdogz

  • 200BHP Senior Member
  • ****
  • Posts: 447
    • View Profile
(No subject)
« Reply #6 on: 17:15, Thu 17 July 2008 »
so   vulpyfox

the fuel mix screw angles down???....


thanks

James5

  • Test
  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 2772
    • View Profile
(No subject)
« Reply #7 on: 18:28, Thu 17 July 2008 »
Quote from: "dgdogz"
so   vulpyfox

the fuel mix screw angles down???....


thanks

Try this matey

dgdogz

  • 200BHP Senior Member
  • ****
  • Posts: 447
    • View Profile
(No subject)
« Reply #8 on: 19:37, Thu 17 July 2008 »
ah haaaaaaaaaaaaaaa

yes.....some man
answered all in one
thanks very much
see i was mukn around with th mixture screw
its runnin lean now i guess

help with this plz...
see wt ws wrong was i replaced all my hoses when i realised i had a split in a few of them...when i did it the idle speed was higher..i guessed it was coz i had taken all air leaks away...
so me being stupid..i turned thel mixture down from 1500 to 1000

my mushy brain tells me if i turn the fuel mixture back up and then turn the idle mix screw down to 1000 will that put me on th ryt path

as i had the carb tuned a few weeks ago and jus kinda undone his work
hahaha

thanks again
d

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #9 on: 19:50, Thu 17 July 2008 »
Rule of thumb is to wind the mix screw all the way in, not to tight or it will break, then turn it back out 2 1/2 turns & check idle, if it sounds a little lumpy then adjust it a little more, or use a co machine or wideband.

dgdogz

  • 200BHP Senior Member
  • ****
  • Posts: 447
    • View Profile
(No subject)
« Reply #10 on: 20:22, Thu 17 July 2008 »
ok man thanks

can u tell me th difference between the mix screw and th idle jet???
thanks
d

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #11 on: 20:26, Thu 17 July 2008 »
The idle jet is the big brass, non adjustable bit, the mix screw is the tiny brass screw in the tube that is adjustable :mrgreen:
 although the idle jet (inside the brass screw when you remove it) sometimes gets blocked & needs a blow through or a tiny needle to poke the crap out.

James5

  • Test
  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 2772
    • View Profile
(No subject)
« Reply #12 on: 20:37, Thu 17 July 2008 »
so me being stupid..i turned thel mixture down from 1500 to 1000

my mushy brain tells me if i turn the fuel mixture back up and then turn
the idle mix screw down to 1000 will that put me on th ryt path


Makes no sense matey.

The Rpm high and low is controlled by the Carb Idle screw.

The mixture screw affects the AFR / fuel mixture screw in to lean out and undo it to richen up. Follow Steve (GTTBoy) advice with regards to setting it up.

5teve L

  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 3540
    • View Profile
(No subject)
« Reply #13 on: 20:39, Thu 17 July 2008 »
But if turned enough James it will adjust the idle, not to good for driving though.

James5

  • Test
  • Global Moderator
  • 200BHP Senior Member
  • *****
  • Posts: 2772
    • View Profile
(No subject)
« Reply #14 on: 20:43, Thu 17 July 2008 »
Quote from: "GTTBoy"
But if turned enough James it will adjust the idle, not to good for driving though.


True a rich mix will prob make it rev a little higher screw it in will lean it out more.