Tunnel Ram Performance?
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Tunnel Ram Performance?

  1. #1
    Senior Member Widetrack's Avatar
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    Default Tunnel Ram Performance?

    Didn't want to thread jack the other thread! I have been asking a few guys about the difference in performance between a single plane hi-rise 1 carb. verses a tunnel ram with 2 carbs on a jet boat?
    I run a Brodix 2000 intake with a 4500 carb.base with a spacer for a 4150 and a worked over 850 Holley DP! Would I see and feel performance gains with a T/R and 2 Holleys? And what would the gains be? WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

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    Senior Member H20MOFO's Avatar
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    If I remember right back on hot boat there was a thread that had guys arguing back and forth for days on this topic. I'm sure the answers will only get MORE intelegent than mine. But I recall in the end the tr had more "potential" if you're willing to find it. And I would dare say more potential for sucking the fuel.
    Another Hot Boat refugee

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    Senior Member back2k5's Avatar
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    Tunnel rams look a lot cooler...thats all I know.

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    why not just a nice dominator coby? carbs on a tram are fun to tune

    Dare to be different, if it turns out great you can claim you planned it that way.

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    Senior Member matt1840's Avatar
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    Tell you what... Ive always had high rise single plane manifolds on the motors ive built... The motor i recently built has a tunnel ram and 2 750's on it.. The performance is great but tuning the 2 carbs is a pain in the ass. NOT to mention sucks the fuel like no other.. I sucked almost 20 gallons in 2 hrs.. There is a strong change in the mid to high rpm area.. Much more responsive feeling to me. Down low in the rpm on the launch isnt as strong, but i still have some tuning to do on the carbs. There are guys on here that run em and have strong power throughout the rpm range. im sure some will chime in.

  8. #6
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by back2k5 View Post
    Tunnel rams look a lot cooler...thats all I know.
    I have seen this stack it on as high as they can! COOLEFECT!

    Quote Originally Posted by IMPATIENT 1 View Post
    why not just a nice dominator coby? carbs on a tram are fun to tune
    Tom I have one and it is a 3 circut to hard to tune! I was thinking that a tram had more performance since most everyone runs one!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

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    gn7
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    I love this whole gas usage complaint. If the A/R is the same, and you are using more fuel, then common sense tells me it's making more power. There is no reason a TR can't get the same fuel comsumption rate at the same RPM in cruize. But you have to work at it. If you don't know your way around a carb that well, a RIGHT single on the RIGHT manifold can be easier. Bottom line is, the more motor you have, the more it whats a TR. Fueling a 632 at 7000 with a single is a joke. A wimpy 396 @ 5500, isn't so TR friendly.



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    Last edited by gn7; 08-25-2009 at 03:41 PM.

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    Senior Member hotbo's Avatar
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    coby talk to scott on this subjecthe has back to back dyno charts where a t-ram made more power every where,me im a single carb guy no matter what.

    we argue alotbut in the end i really dont now???to be honest best thing to do is dyno back to back and see what happens.

    tuning 2 carbs is not voodo,need some one experinced,scott is your guy.

    friend and good engine guru. i build and tune my own shit,but he is always there for the advice i need.
    '
    good luck my friend.travis

  11. #9
    just a ski boat with bark Carnivalride's Avatar
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    Well mines not on a jetboat but I switched from a flowed 850 (990cfm) on a Weiand Team G to and Edelbrock 2R tunnel ram with a custom top and 2 Holley 750DPs (4779-9s). Now I gained 400rpm on the flash and between 100-150rpm up top. It's a solid 2/10ths quicker in a 1000' as far as gas consumption I see no difference. I drug my kids tubing with it 2 weekends ago and burned 16 gallons in about 5-1/2hrs and that was basically non stop running with 5 teenagers ranging from 14-20 in age. So it's no worse than my single 4bbl was. Now it took longer to tune and you buy another jet kit or start trading with a buddy because it's literally double on everything you do on a single. Now that it's tuned I really don't see any issue or down side with it other than initial price and I do run primary powervalves.

    Oh and you'll spend more than you realize plumbing a tunnel ram to or I just forgot about that.
    Last edited by Carnivalride; 08-26-2009 at 08:16 AM. Reason: Removed pics as requested

  12. #10
    Senior Member The Violater's Avatar
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    Lets face it, a tunnel ram is a must on a jet or v-drive if you can't afford a blower. Multiple carbs sets you apart from the average joe blow. A 468 will run just as good with a single 850 no doubt in my mind, as far as fuel consumption, stay away fron the 660's those things absolutely DRINK fuel. I always ran 750's and put 650 bowls on them with the transfer tubes so I could run them inline without a lot of hardware. 50 cc accelerater pumps, a light spring in the secondary vacuum diaphram get them jetted right with a vacuum tube connecting both secondary diaphrams (you drill the tops and connect them together) and you are good to go trouble free, no hesitation and great mid range and high end. You can hear when the secondary's are coming in when cruising, and stay on the primarys for the ride home when you are on your last 2 gallons...................... Tunnel ram vs Single carb............. no brainer in the cool look at me dept. !!!!!! I run the same set up on my blower motor and it gets good fuel economy and runs great, I adust it every spring and don't have to touch it, I go through my lifters once a month, ck my timing and adjust them just for kicks, but they are usually right on !!!!
    / The Few The Proud TheBlown

  13. #11
    Owner/Crew Chief 1/4 Miler's Avatar
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    Head flow & cam are the key.

  14. #12
    Senior Member The Violater's Avatar
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    Quote Originally Posted by The Violater View Post
    Lets face it, a tunnel ram is a must on a jet or v-drive if you can't afford a blower. Multiple carbs sets you apart from the average joe blow. A 468 will run just as good with a single 850 no doubt in my mind, as far as fuel consumption, stay away fron the 660's those things absolutely DRINK fuel. I always ran 750's and put 650 bowls on them with the transfer tubes so I could run them inline without a lot of hardware. 50 cc accelerater pumps, a light spring in the secondary vacuum diaphram get them jetted right with a vacuum tube connecting both secondary diaphrams (you drill the tops and connect them together) and you are good to go trouble free, no hesitation and great mid range and high end. You can hear when the secondary's are coming in when cruising, and stay on the primarys for the ride home when you are on your last 2 gallons...................... Tunnel ram vs Single carb............. no brainer in the cool look at me dept. !!!!!! I run the same set up on my blower motor and it gets good fuel economy and runs great, I adust it every spring and don't have to touch it, I go through my lifters once a month, ck my timing and adjust them just for kicks, but they are usually right on !!!!
    Here's my set up, ran the same thing on tunnel ram's for years !
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    / The Few The Proud TheBlown

  15. #13
    Senior Member The Violater's Avatar
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    Quote Originally Posted by 1/4 Miler View Post
    Head flow & cam are the key.
    Agreed, however thats the beauty of vacuum secondarys, you won't dround a little motor and you still have an exotic looking set up to the average smuck !!!!
    / The Few The Proud TheBlown

  16. #14
    Senior Member Widetrack's Avatar
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    Quote Originally Posted by 1/4 Miler View Post
    Head flow & cam are the key.
    This is very true! My cam makes good power to 6000 RPM and the 850 DP turns it to 5850-5950 RPM so it's a wash right?? WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

    WFL Crew!!!

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