Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11

Thread: 4age carb set up

  1. #1
    Junior Member
    Join Date
    Jan 2018
    Name
    Juan
    State
    Doha
    Location
    Doha
    Country
    Qatar
    Posts
    14

    Default 4age carb set up


    TO REMOVE ADS, PLEASE
    REGISTER OR SIGN IN
    Hi
    I am installing carbs on one of my ae86
    Engine 4age, FAT performance head, 12,5 pistons, web cams high lift , peak rpm 8000 .
    Originally the engine had a downdraft weber carb( buggy) , now I have installed a pair of Mikuni 44 , original specs( I think 34 chokes, 190 air a 150 main)
    Engine has torque at low rpm and doesn’t have top end.
    Question??? What carburator set up its recommended to start ???
    And what ignition top end set up.
    Thanks


    Sent from my iPhone using Tapatalk

  • #2
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    900

    Default

    There are many wiser people out there, but things I suspect are:
    - If the carbs aren't tuned for that engine then they will never work well. You can play with jet sizes and needle heights yourself until it feels OK, but a good carb tuner will make life much easier.
    - You may not have enough ignition advance at high revs. What ignition setup have you used? Programmable or vacuum/mechanical advance?
    - Is everything else good? Cam timing? Fuel pressure? etc?

  • #3
    Junior Member
    Join Date
    Jan 2018
    Name
    Juan
    State
    Doha
    Location
    Doha
    Country
    Qatar
    Posts
    14

    Default

    Quote Originally Posted by Hen may possibly be a nut View Post
    There are many wiser people out there, but things I suspect are:
    - If the carbs aren't tuned for that engine then they will never work well. You can play with jet sizes and needle heights yourself until it feels OK, but a good carb tuner will make life much easier.
    - You may not have enough ignition advance at high revs. What ignition setup have you used? Programmable or vacuum/mechanical advance?
    - Is everything else good? Cam timing? Fuel pressure? etc?
    Thanks
    Ignition, I left it fix 29 or 30 ( conservative)
    Yes I need to start working with the jets and the speed of the venturis( chokes)
    I needed some basic start up set up to order those jets and needles
    But , everything its ok
    The engine its well prepared, good compresion
    Thanks a lot


    Sent from my iPhone using Tapatalk

  • #4
    Senior Member Hen may possibly be a nut's Avatar
    Join Date
    Jan 2009
    Name
    Hen
    State
    Victoria
    Location
    Mt Macedon
    Country
    Australia
    Posts
    900

    Default

    Fixed ignition timing will really hurt. Getting the ignition advance right throughout the rev range and MAP is what will really give you power.

    Try googling for what others have used on 1600cc engines with roughly the same sized carbs and chokes. There should be some info around, especially from the rally guys.

  • #5
    Moderator Sam-Q's Avatar
    Join Date
    Dec 2008
    Name
    Sam
    State
    VIC
    Location
    Endeavour Hills
    Country
    Australia
    Posts
    4,241

    Default

    The company called Scorcher used to do a custom drop in standalone distributor for the 4age. These has the traditional mechanical advance mechanism inside.

    Running carbs on a 4age is not something I would suggest but it's your call.
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

  • #6
    Junior Member
    Join Date
    Jan 2018
    Name
    Juan
    State
    Doha
    Location
    Doha
    Country
    Qatar
    Posts
    14

    Default

    Quote Originally Posted by Sam-Q View Post
    The company called Scorcher used to do a custom drop in standalone distributor for the 4age. These has the traditional mechanical advance mechanism inside.

    Running carbs on a 4age is not something I would suggest but it's your call.
    Thanks Sam
    Great respect !!!
    But trying to squeeze my AE86 in the class Vintage rules .
    I just pull out a black top ( using the water relocator from Sam-Q) engine with adaptronic ecu.
    Yes, I have heard of this company, and they produce good stuff, but , I will install either electromotive or NODIZ , so I dont use any dizzy.
    Was looking for some solid info from any old school guy , for the set up.
    Cheers


    Sent from my iPhone using Tapatalk

  • #7
    Member
    Join Date
    Jun 2010
    Name
    Rob
    State
    NSW
    Location
    Armidale
    Country
    Australia
    Posts
    43

    Default

    Just to add to whats been said.

    By the sound of them m ods to the engine 45 webers would be a starting point ,remembering that venturi size determines all other jetting.

    34MM venturis=1600 cc but 34mm venturis are getting to the usable max on a dcoe 40 with the mods to your engine 45 dcoes would give you more scope.

    Second the scorcher set up works really well and simple to set up well worth the money.

    As for the carb v injection its a never ending .I have a carbed 4a and love it each to there own.

    rob

  • #8
    Senior Member
    Join Date
    Jun 2011
    Name
    james
    State
    oxford
    Location
    general area
    Country
    England
    Posts
    128

    Default

    Your Freedom ecu can be configured to run carbs.

  • #9
    Junior Member
    Join Date
    Jan 2018
    Name
    Juan
    State
    Doha
    Location
    Doha
    Country
    Qatar
    Posts
    14

    Default

    Quote Originally Posted by tottacrolla View Post
    Your Freedom ecu can be configured to run carbs.
    ???


    Sent from my iPhone using Tapatalk

  • #10
    Junior Member
    Join Date
    Jan 2018
    Name
    Juan
    State
    Doha
    Location
    Doha
    Country
    Qatar
    Posts
    14

    Default


    TO REMOVE ADS, PLEASE
    REGISTER OR SIGN IN
    Quote Originally Posted by corollaart View Post
    Just to add to whats been said.

    By the sound of them m ods to the engine 45 webers would be a starting point ,remembering that venturi size determines all other jetting.

    34MM venturis=1600 cc but 34mm venturis are getting to the usable max on a dcoe 40 with the mods to your engine 45 dcoes would give you more scope.

    Second the scorcher set up works really well and simple to set up well worth the money.

    As for the carb v injection its a never ending .I have a carbed 4a and love it each to there own.

    rob
    Rob
    Yes , I am buying bigger venturis 38mm
    Kind a difficult to find them in USA
    The carbs are Mikuni 44
    38 x 4 = 152 fuel + 40 = 190 air corrector
    Yes , i have just heard good things about the scorcher, will see if I lean to it.
    Thanks for the inputs


    Sent from my iPhone using Tapatalk

  • Page 1 of 2 1 2 LastLast

    Similar Threads

    1. 4age carb with 4k dizzy
      By drift in forum Technical - Questions
      Replies: 2
      Last Post: 24th November 2014, 04:29 AM
    2. 4age carb set up
      By samjay in forum Cars or Parts Wanted
      Replies: 1
      Last Post: 20th August 2014, 02:32 AM
    3. 4age carb how to?
      By Pidgey in forum Technical - Questions
      Replies: 47
      Last Post: 16th April 2013, 05:33 AM
    4. smallport 4age and carb set up
      By MR86ER in forum Cars or Parts Wanted
      Replies: 0
      Last Post: 30th September 2010, 05:20 PM
    5. 4age carb'd
      By driftae71 in forum Technical - Questions
      Replies: 22
      Last Post: 16th July 2007, 08:35 PM

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •