tunnel ram tunning
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tunnel ram tunning

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    custom member raped southwind's Avatar
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    Default tunnel ram tunning

    Im running a wieand tunnel ram with 4150 carbs mounted sideways. Im running thru transom headers and im tired of the black crap staining my transom. Im almost positive its rich at idle and have been jetting down slowley to try and fix the problem. but now the problem is that its only hapening on one side( the primary side of the carbs) any one have this problem or any advice to fix this. Originally the carbs were set up with power valve plugs and have since been replaced with power valves and jetted down. the plugs look good after a run it wot so im a little scared to keep pulling fuel out of the primarys . Do i need to bump the primarys down and the mains up? or am i going about this all wrong
    Last edited by raped southwind; 07-22-2013 at 01:53 PM.

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    Quote Originally Posted by raped southwind View Post
    Im running a wieand tunnel ram with 4150 carbs mounted sideways. Im running thru transom headers and im tired of the black crap staining my transom. Im almost positive its rich at idle and have been jetting down slowley to try and fix the problem. but now the problem is that its only hapening on one side( the primary side of the carbs) any one have this problem or any advice to fix this. Originally the carbs were set up with power valve plugs and have since been replaced with power valves and jetted down. the plugs look good after a run it wot so im a little scared to keep pulling fuel out of the primarys . Do i need to bump the primarys down and the mains up? or am i going about this all wrong
    The jets have nothing to do with the idle circuit at all

    Holley, has a good book on tuning, step by step
    it will go thru tuning each circuit, do's and don'ts
    And will give you a better overall understanding

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    Quote Originally Posted by BigSteve View Post
    The jets have nothing to do with the idle circuit at all

    Holley, has a good book on tuning, step by step
    it will go thru tuning each circuit, do's and don'ts
    And will give you a better overall understanding
    due to my impeller( jet boat) being fairly small with a fairly heavy boat I set my idle up around 1200-1300 that way im not moving at a snails pace. do you think im still in the idle circuit at that rpm?

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    You probably have the t-plates open so far it's pulling fuel from the transfer circuit and causing rich...Remove the main jets and it will still idle.

    The screw that opens and closes the t-plates is not (exactly) an isle speed screw. It can be used to adjust idle rpm as long as the t-plates aren't open so far as to pull fuel from the transfer circuit.

    If it idles clean at a lower rpm and still want the 1300 rpm deal you will need to drill a hole the each t-plate.
    Last edited by SoldHondaBoughtHondo; 07-22-2013 at 03:03 PM.
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    Quote Originally Posted by SoldHondaBoughtHondo View Post
    You probably have the t-plates open so far it's pulling fuel from the transfer circuit and causing rich...Remove the main jets and it will still idle.


    Your must have the throttle plates closed, the way you increase idle rpm is by drilling holes in the throttle plates

    If you don't the idle and transfer transition slots timing is so far off
    The carb wont work correctly

    You may want to send them to a pro carb shop
    with the engine build sheet type of boat and drive
    They can do some amazing things with the circuits
    the avg joe isn't set up to do

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    If they are 4 cornor idel make sure the Air-Fuel screws are set the same!

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    What I did is to restrict the idle circuit passage on the main body.If you don't it will always be rich.Because 1 carb is designed to feed 8 cylinders at idle.So two carbs is feeding 16.I tapped it 8/32 and drill those half of the original size.Mine idles clean no stumble.

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    Thank you all for the help. Only adjustments on the pri metering block! My biggest problem is why is only one side of the boat running dead fat?
    Last edited by raped southwind; 07-22-2013 at 07:09 PM.

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    Are the primaries over the same side that is running fat??

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    Quote Originally Posted by carreradude View Post
    Are the primaries over the same side that is running fat??
    Yes!

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    Quote Originally Posted by raped southwind View Post
    Yes!
    4150 covers a lot of carbs. 600 to 1000 cfm.
    Two 1000s on a 327 chevy can have that effect on the idle circuit.



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    Quote Originally Posted by gn7 View Post
    4150 covers a lot of carbs. 600 to 1000 cfm.
    Two 1000s on a 327 chevy can have that effect on the idle circuit.
    Sorry 2-750's on a 468!

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    Double pumpers tend to have idle restrictors that are a little large for dual carb T rams.
    The easiest way to lean out the idle is to reduce flow thru the idle restrictor by using a wire. Like Vami said, you can drill out the idle restrictor and use screw restrictors from places like QF or Bo Laws, or you can drill you own restrictor using a brass set screws and drill your own.

    The easiest method is to bend a .020(approx.) wire and insert into to the idle restrictor. You can measure the wire in things like wire brushes and find a wire that is pretty close.







    Quote Originally Posted by raped southwind View Post
    due to my impeller( jet boat) being fairly small with a fairly heavy boat I set my idle up around 1200-1300 that way im not moving at a snails pace. do you think im still in the idle circuit at that rpm?
    I would also stop trying to set your idle speed to some desired boat speed.



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    Thank you bob! I understand how to lean it out now but why is it only showing rich on the one side. Is it strictly because the primary's are on the same side? Now by leaning out the idle circuit will I be fighting problems with the opposite side going too lean at idle?

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