Manifold Vacuum
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Manifold Vacuum

  1. #1
    79 Sanger Picklefork Tittyman's Avatar
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    Default Manifold Vacuum

    I have a tunnel ram with dual 450's..the tunnel does not have a vacuum port to hook a guage to so you can get a true vacuum reading. The carbs have vacuum ports but are located in the metering block rather than down in the base plate. Can you adjust your carbs using that port or do you have to drill and tap into the tunnel?
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    Senior Member jetboatperformance's Avatar
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    I would drill and tap , this as I'm sure you know is invaluable tuning info ! Tom

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    79 Sanger Picklefork Tittyman's Avatar
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    Quote Originally Posted by jetboatperformance View Post
    I would drill and tap , this as I'm sure you know is invaluable tuning info ! tom
    I knew that's how the reply would come back..I guess there is no other way to get a good carb adjustment..if I drill and tap into the tunnel where should the port be located..on top between the carbs on underneath between the carbs or down on the bottom of the manifold between the carbs...
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    Just Me snoc653's Avatar
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    Tap the plenum between the two carbs. This will give you a more accurate reading of what the carbs are seeing. It appears in the picture Tom posted his is tapped between the two carbs at the bottom of the plenum.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by snoc653 View Post
    Tap the plenum between the two carbs. This will give you a more accurate reading of what the carbs are seeing. It appears in the picture Tom posted his is tapped between the two carbs at the bottom of the plenum.
    Good Eye

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    Quote Originally Posted by snoc653 View Post
    Tap the plenum between the two carbs. This will give you a more accurate reading of what the carbs are seeing. It appears in the picture Tom posted his is tapped between the two carbs at the bottom of the plenum.
    x2 its the only way on a tram to get a accurate nuff reading to gauge powervalves by

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    79 Sanger Picklefork Tittyman's Avatar
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    Quote Originally Posted by snoc653 View Post
    Tap the plenum between the two carbs. This will give you a more accurate reading of what the carbs are seeing. It appears in the picture Tom posted his is tapped between the two carbs at the bottom of the plenum.
    What is the best size drill and tap...can I do this by removing one carb and stuffing a bunch of rags down into the manifold to catch the shavings so I don't have to remove the manifold..
    "Bill, if your gonna ride my ass that hard, at least you could pull my hair"....Hillary Clinton

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    Passin Glass HOOLI's Avatar
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    Quote Originally Posted by Tittyman View Post
    What is the best size drill and tap...can I do this by removing one carb and stuffing a bunch of rags down into the manifold to catch the shavings so I don't have to remove the manifold..
    I wouldn't even consider drilling it on the motor. For the time it takes to remove a few hoses and the manifold compared to getting cuttings in there...

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    AKA OhOneWS6 Last Mohican's Avatar
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    Quote Originally Posted by Tittyman View Post
    What is the best size drill and tap...can I do this by removing one carb and stuffing a bunch of rags down into the manifold to catch the shavings so I don't have to remove the manifold..
    Since tunnel rams are in two pieces it should be a piece of cake to take the carbs and top off. Not to mention what a pain in the ass it's going to be even with an angle drill to get in there. I agree with HOOLI. Why risk it.

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