Putting a Tunnel Ram on Penut Port heads???
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Putting a Tunnel Ram on Penut Port heads???

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    Senior Member back2k5's Avatar
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    Question Putting a Tunnel Ram on Peanut Port heads???

    I'm currently running and AirGap RPM intake with a 715 Holley with my crappy peanut port heads on my 454...I want a tunnel ram and I have my eye on one with dual 750's. I wanted to eventually snag a pair of 990's but I dont think Im going to take that leap quite yet. What would happen if I put that much cfm on my heads?
    Last edited by back2k5; 05-20-2011 at 08:44 AM.

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    Default top to bottom

    Back2K5, please remember that ANY performance enhancements MUST be compatible with the rest of the package, top to bottom. I would strongly recommend building another engine, from top to bottom, with the T/Ram and the 750s in the plan from the beginning.
    Enjoy your boat, "as is", until the monster motor is ready... Pull the existing engine and put it under a bench in complete form. Install the "killer" T/ram'd motor, and step on the gas...... IF you have issues with the monster, (and you will), you can always go back to the "old reliable" engine under the bench..... I would highly recommend NOT putting a dual 750 carb'd intake on that engine even IF you had the 990s.... AND, I'm betting the 715 single carb will out perform the T/Ram'd 1500 cfm...unless you're ready to spend some big bucks internally... Speed costs money, how fast do you want to go?......
    Ray
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    Senior Member back2k5's Avatar
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    Quote Originally Posted by Moneypit View Post
    Back2K5, please remember that ANY performance enhancements MUST be compatible with the rest of the package, top to bottom. I would strongly recommend building another engine, from top to bottom, with the T/Ram and the 750s in the plan from the beginning.
    Enjoy your boat, "as is", until the monster motor is ready... Pull the existing engine and put it under a bench in complete form. Install the "killer" T/ram'd motor, and step on the gas...... IF you have issues with the monster, (and you will), you can always go back to the "old reliable" engine under the bench..... I would highly recommend NOT putting a dual 750 carb'd intake on that engine even IF you had the 990s.... AND, I'm betting the 715 single carb will out perform the T/Ram'd 1500 cfm...unless you're ready to spend some big bucks internally... Speed costs money, how fast do you want to go?......
    Ray
    Right now Im into the late 50's early 60's with a full load...Eventually Id like to be in the 70's to mid 80's but speed isn't my main agenda. I love how T-rams look on boats, If I knew I could put this thing on and not gain or lose a single mph then I would...Yes I know Im shallow

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    Quote Originally Posted by Moneypit View Post
    Back2K5, please remember that ANY performance enhancements MUST be compatible with the rest of the package, top to bottom. I would strongly recommend building another engine, from top to bottom, with the T/Ram and the 750s in the plan from the beginning.
    Enjoy your boat, "as is", until the monster motor is ready... Pull the existing engine and put it under a bench in complete form. Install the "killer" T/ram'd motor, and step on the gas...... IF you have issues with the monster, (and you will), you can always go back to the "old reliable" engine under the bench..... I would highly recommend NOT putting a dual 750 carb'd intake on that engine even IF you had the 990s.... AND, I'm betting the 715 single carb will out perform the T/Ram'd 1500 cfm...unless you're ready to spend some big bucks internally... Speed costs money, how fast do you want to go?......
    Ray
    X2 And " OBNOXIOUS " has a nice short block which would be a great start for you! He has ported 990's also ,and a pretty tunnel ram. Hit him up one stop shopping Close to you. BTW the logs look good Now

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    Senior Member back2k5's Avatar
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    Quote Originally Posted by PS&B1 View Post
    X2 And " OBNOXIOUS " has a nice short block which would be a great start for you! He has ported 990's also ,and a pretty tunnel ram. Hit him up one stop shopping Close to you. BTW the logs look good Now
    Did you get them all hooked up? Any pics?

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    Default tunnel ram add on

    Quote Originally Posted by back2k5 View Post
    Did you get them all hooked up? Any pics?
    Another route you could look at,if you really want the tunnel ram on the boat, is to pull the heads and gasket match the peanut ports to large port. And I would try to find a top plate and run one of the 750 but both is a bit too much. Just my (cheap fix) opinion.

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by back2k5 View Post
    I'm currently running and AirGap RPM intake with a 715 Holley with my crappy peanut port heads on my 454...I want a tunnel ram and I have my eye on one with dual 750's. I wanted to eventually snag a pair of 990's but I dont think Im going to take that leap quite yet. What would happen if I put that much cfm on my heads?
    One time a friend of mine thought he would gain performance by ditching the "stock" 715 cfm Holley carb off his very mildly build 454 (stock 4.250" bore and pistons, oval heads, zero decked, mild jet boat cam)that I put together for his boat. He bought an 850 Demon without checking with me, 20 foot open bow jet boat with mild pump work, turned around 4900-5000 RPM before and after the carb change, even with lots of time spent trying different jetting.

    You can put a tunnel ram on your engine, but I think you will lose some low end performance.

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    Quote Originally Posted by back2k5 View Post
    Did you get them all hooked up? Any pics?
    No pics, They are "spares"

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    Quote Originally Posted by Moneypit View Post
    I would highly recommend NOT putting a dual 750 carb'd intake on that engine even IF you had the 990s....

    Please explain this!

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    X2 on Moneypit's advice. Your system as it is, is good to about 5,500 Rpm. Depending on your pump impellor you may not be turning that high now. Throttle response and engine performance is a function of flow velocity through the carburetor, intake, and exhaust system. What the other members are suggesting is by doubling your carburetor CFM and going to the tunnel ram with no other changes, the flow velocity is reduced significantly. Means poor throttle response, possibly increased fuel consumption, and loss of engine engine performance until about 4,000 Rpm or so. If it is the look you are after and are willing to suffer the probable reduced performance, the tunnel ram will look good. You just may not be happy with the way your boat runs after making the changes.

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    Default Really?

    Quote Originally Posted by HaulinAss View Post
    Please explain this!
    Basic STOCK 454, "with crappy peanut port heads".... Not to mention the extremely MILD camshaft, flat top pistons, and a STOCK bottom end..... Why would anyone want to destroy the drive-ability of a pleasure boat strictly because a T/Ram "looks" meaner? There is a very good reason why it came with the 715, it's called "do the math"......
    Ray
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    WERD! HaulinAss's Avatar
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    Quote Originally Posted by Moneypit View Post
    Basic STOCK 454, "with crappy peanut port heads".... Not to mention the extremely MILD camshaft, flat top pistons, and a STOCK bottom end..... Why would anyone want to destroy the drive-ability of a pleasure boat strictly because a T/Ram "looks" meaner? There is a very good reason why it came with the 715, it's called "do the math"......
    Ray
    Well here is what worked for me

    100k Mile Stock Suburban Motor
    Ok Solid Tappet Cam Nothing Huge
    Tunnel Ram w/2 yes 2 750 Carbs
    Pretty Much that about it

    Went 84mph in a Bahner Jet w/Stock Pump NO Ride Plate, Shoe, Stuffer or non of that fancy stuff there!
    Same Combo in a Poorly Rigged 72 Hondo Flatty went 90.0
    Same Combo in a Hondo TR-2 went 94.7

    OH YEAH PUMP GAS!!!!

    And Drivability was awesome!!!
    Last edited by HaulinAss; 05-21-2011 at 09:20 PM.

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    Purple headed member Quickjet's Avatar
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    Quote Originally Posted by Moneypit View Post
    Basic STOCK 454, "with crappy peanut port heads".... Not to mention the extremely MILD camshaft, flat top pistons, and a STOCK bottom end..... Why would anyone want to destroy the drive-ability of a pleasure boat strictly because a T/Ram "looks" meaner? There is a very good reason why it came with the 715, it's called "do the math"......
    Ray
    Ray...your math is wrong!
    Doesnt' matter if the 454 is a stock bottom end or one that is built to the hilt because the cubes are just along for the ride (especially at only 6,500rpm) 95% of the power in any combo is made from the Camshaft, heads and intake system. And Chevrolet put 990's on stock motors. Like Haulinass said, they work great on 8.5:1 compression Suburban shortblocks and 13-1 race motors. Been there, done that. NOthing better than running nearly 95mph with a $1,500 motor season after season on 87 octane (and still running to this day I might ad)

    To the original poster: Put the ram on it. You probably wont gain a thing being that you have the small cam and heads but for now it will look cool. Later you can upgrade the heads and camshaft and have some real fun.
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    Default L.A. City Schools

    Quote Originally Posted by Quickjet View Post
    Ray...your math is wrong!
    Doesn't' matter if the 454 is a stock bottom end or one that is built to the hilt because the cubes are just along for the ride
    OK I went to LA City Schools, maybe it's old math, but math doesn't really change. An internal combustion engine is nothing more than an "air pump". An air pump that will only pass "so much" air through it at a given RPM... (Unless it has some sort of "boost")

    Simple formula: CID x max RPM
    ---------------- OR
    3456

    454x6000
    --------- = 788
    3456



    So, please point out where the equation needs correction? I realize the OP most likely won't see 6000, but it is a nice round number.... (5600= 735)
    There is no correction for intake/exhaust, or cylinder head differences because it is based purely on CID. While different heads flow better than others, or different cams/exhaust systems can add/deduct from the basics, it is the actual CID that is the limiting factor when it comes to flowing air through an engine under NA air pressures. OK, Ok, a slight "fudge" from these numbers is apparent in certain applications, but to attempt to DOUBLE the cfm is ludicrous, and will not be anywhere close to the 100% volumetric efficiency standard used above....
    Math does not lie...
    Ray
    Last edited by Moneypit; 05-22-2011 at 12:17 PM.
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