Do single carb tunnel rams work ?
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Do single carb tunnel rams work ?

  1. #1
    World Class Detailer BigDoug's Avatar
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    Default Do single carb tunnel rams work ?

    Is there a reason why i don't see too many single tunnel rams on jet boats these days ?
    Do hi-rise manifolds flow better than a single ?.........tell me your thoughts and experiences.

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    Senior Member milkmoney's Avatar
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    Quote Originally Posted by BigDoug View Post
    Is there a reason why i don't see too many single tunnel rams on jet boats these days ?
    Do hi-rise manifolds flow better than a single ?.........tell me your thoughts and experiences.
    sorry about the jac. is your boat a miller..

  4. #3
    World Class Detailer BigDoug's Avatar
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    Yes it is...

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    Senior Member milkmoney's Avatar
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    Quote Originally Posted by BigDoug View Post
    Yes it is...
    thanks .how do you like it???

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    World Class Detailer BigDoug's Avatar
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    Absolutely love it, if you send me an email address i can send some pics if you like ?

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    Senior Member milkmoney's Avatar
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    Quote Originally Posted by BigDoug View Post
    Absolutely love it, if you send me an email address i can send some pics if you like ?
    ok pm sending sorry for the jack. carry on

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    "It's HONDO, honey" Kyle's Avatar
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    Real men have two . The more air and gas you can get into a motor the more horsepower it makes, but more importantly if your running a big cubic inch motor sometimes a single carb on a tunnel ram is not enough fuel feed. A tunnel ram builds momentium with a lot of gas and air. Go for the two
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    Senior Member H20MOFO's Avatar
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    No single tr's for me.....except the one that cost me 6k because I burnt a hole through a set of 990's between 5 and 7 bid enougph to stick your pinky finger through.
    Another Hot Boat refugee

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by BigDoug View Post
    Is there a reason why i don't see too many single tunnel rams on jet boats these days ?
    Do hi-rise manifolds flow better than a single ?.........tell me your thoughts and experiences.
    I ran a single top years ago and learned alot about what it takes to make them run. If you figure the plenum area vs the feul than you will see that when you hit the load peddle it's going to want a big shot of feul. Then you figure that air mass at rpm and it will or should tell you that the motor is going to need an equal amount of feul at all rpm ranges to perform at potential. Fats where it's at with a single top. M

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    Senior Member n8dawg's Avatar
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    I've always heard that it leans out a couple of the cylinders, thus causing holes in the tops of pistons!

    No way would I go that route.

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    Run a dual carb tunnel ram. I have not heard anything positive about a single carb on a tunnel ram manifold.

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    ....like warm apple pie RaceFace's Avatar
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    I ran that setup for about 4-5 years and what I learned (thanks Greg Shoemaker) is that its tough to dial in a motor with that. With that kind of volume in the manifold, you stab it and start hauling ass, the mixture wants to head towards the rear cylinders, and in return, leaning out the front cylinders. Mine was ALWAYS a bitch to start cold too. Once the vacuum was built after the first fire, it would kick immediately, all weekend long....it was just on the ramp trying to get fuel to all cylinders, not just the center 4. I was advised by many people to either go dual carbs or get rid of the tunnel ram. I was getting ready to dump the manifold for a Performer RPM and ended up selling the boat instead.

    Just my experience. Good luck with the project!
    Race

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    World Class Detailer BigDoug's Avatar
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    Thanks guys, now i understand what's going on !!

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    Resident Ford Nut Sleeper CP's Avatar
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    Try this:
    http://www.performanceboats.com//showthread.php?t=446

    The biggest problem is distribution. Modern Hi-Rise intakes will do a much better job

    Edit: at the bottom of the thread idex page the default setting for thread's is set at 2 months. Change it to 1 year and you will see many more pages of past thread's.


    Sleeper CP
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    Last edited by Sleeper CP; 05-13-2008 at 08:33 PM.

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