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Topic Review (Newest First)

  • 04-13-2009, 08:02 AM
    Sleeper CP
    Quote Originally Posted by moneysucker View Post
    Jon,

    Just throw Wes' motor in it and be done. Geez.

    Cy
    I was born with one belley button why do I need another one

    S CP
  • 04-13-2009, 08:01 AM
    Sleeper CP
    Quote Originally Posted by BUSBY View Post
    So 8.80's @ 115ish with a blown motor/set up, 8.50's @ 120ish with an all aluminum n/a set up with about twice the cost. Same boat hull, driver, etc.

    Does that answer your question Sleeper? I know you probably weren't looking at an aluminum block deal, but that's what it will take if you want it to perform like a blower deal IMO. (or n20)

    This question has been around for a long time and debated hundreds of times. People are always wondering if a different engine combination would make it faster/quicker. Too many variables to just guess, but Mike is really smart and has done his homework ... he is the best person to ask about this IMO.
    BB,

    Thank you for making this a useful thread Good info.

    I think you stated that the two engines above were of the same power and the alumni weighed less, so in my example the smaller engine with 100 less hp more than likely (generally speaking) would get outperformed by the 100 hp more blown BB turning 1,000 less rpm.

    I guess I should ask Mike what rpm he turned each set up ?


    Hummmmmmmmm

    S CP
  • 04-13-2009, 07:12 AM
    BUSBY
    Quote Originally Posted by cyclone View Post
    oh you're right. its stupid expensive and difficult to make the aluminum n/a engine work. cost roughly double what that old blown motor cost. its quicker now, but it wasn't easy getting there.

    the first race after the motor swap the boat ran a best of 9.10 at 113 mph with the aluminum motor.
    a year later and after a ton of tuning (keel change, loaders, shoes, impellers etc) it went 8.53 at 122 mph with the same engine.
    So 8.80's @ 115ish with a blown motor/set up, 8.50's @ 120ish with an all aluminum n/a set up with about twice the cost. Same boat hull, driver, etc.

    Does that answer your question Sleeper? I know you probably weren't looking at an aluminum block deal, but that's what it will take if you want it to perform like a blower deal IMO. (or n20)

    This question has been around for a long time and debated hundreds of times. People are always wondering if a different engine combination would make it faster/quicker. Too many variables to just guess, but Mike is really smart and has done his homework ... he is the best person to ask about this IMO.
  • 04-13-2009, 06:33 AM
    moneysucker
    Jon,

    Just throw Wes' motor in it and be done. Geez.

    Cy
  • 04-13-2009, 06:30 AM
    moneysucker
    Either one would work if they are Chevy's. If one is a ford (Which I am betting it is with you as the author) then everything changes again. as you have discovered with the Abicus Express there are way too many variables to try and use a calculator to determine everything in the real world. SOmetimes what works on paper turns out to bomb on the water and vice versa.
  • 04-12-2009, 10:44 PM
    cyclone
    Quote Originally Posted by BUSBY View Post
    I didn't say it was yours

    but yours is a perfect example of what he's asking. My point was that it isn't that easy to just swap out the motor/impeller and see a difference ... it takes a tons of changes & testing. But since you're here, you want to chime in on how affordable it is do do the N/A aluminum deal? For the normal budget guy, I would have to say no.

    (you know how much I dig your ride, so please don't think I'm baggin in anyway ... but it was the only example I could think of that everyone would know)
    oh you're right. its stupid expensive and difficult to make the aluminum n/a engine work. cost roughly double what that old blown motor cost. its quicker now, but it wasn't easy getting there.

    the first race after the motor swap the boat ran a best of 9.10 at 113 mph with the aluminum motor.
    a year later and after a ton of tuning (keel change, loaders, shoes, impellers etc) it went 8.53 at 122 mph with the same engine.
  • 04-12-2009, 10:24 PM
    BUSBY
    Quote Originally Posted by cyclone View Post
    with a ton of tuning, that boat went 2.5 tenths quicker with the n/a aluminum motor, making the same power, turning a smaller impeller.
    I didn't say it was yours

    but yours is a perfect example of what he's asking. My point was that it isn't that easy to just swap out the motor/impeller and see a difference ... it takes a tons of changes & testing. But since you're here, you want to chime in on how affordable it is do do the N/A aluminum deal? For the normal budget guy, I would have to say no.

    (you know how much I dig your ride, so please don't think I'm baggin in anyway ... but it was the only example I could think of that everyone would know)
  • 04-12-2009, 10:11 PM
    cliffjumper
    Quote Originally Posted by hotrod56cars View Post
    I have no idea what I'm writing about, but IF you could get the proper impellor cuts for each given curve and IF all of the hardware was properly set up for each application and IF everything else was the same... and assuming the NA boat weighed 2,000 lbs. and the blown boat weighed 2,050 lbs, the NA boat has .375 HP per pound and the blown boat has .41 HP per pound which should mean IF everything else were correct the blown boat should have a quicker ET.

    So now that we know what the answer isn't, what's the answer?
    The one who knows how to drive the boat with either engine wins if you dont know how to handle the power dont get it
  • 04-12-2009, 09:39 PM
    cyclone
    Quote Originally Posted by BUSBY View Post
    My point about the variables is that due to the weight/power differences, you are going to have to have completely different set ups. You can't really make a valid arguement to which will work.

    I watched a tunnel boat run 8.80's with an iron block blower motor, moved over to an all aluminium n/a motor, and it ran close to the same, with tuning/testing and a diet, it's a lot quicker/faster ... but with swapping engines/impellers ... I didn't see much of a gain. It took other work to make a significant difference.

    I don't know much either, but this is what I observed.
    with a ton of tuning, that boat went 2.5 tenths quicker with the n/a aluminum motor, making the same power, turning a smaller impeller.
  • 04-12-2009, 09:28 PM
    desrtrat256
    would cam selection come into play? in other words how fast the motor get to its given RPM. Along with a good set up I believe that is also a huge factor. I still take the N/A any day of the week.
  • 04-12-2009, 01:08 PM
    hotbo
    ill take quickness anyday over being the fastest,alot of guys get lost in what this means.i want to get there quick as hell i could care less about top speed.ah hell im lost to.hope everyone is having a good easter.travis
  • 04-12-2009, 12:16 PM
    BUSBY
    Quote Originally Posted by Sleeper CP View Post
    It sounds like it could hole-shot and then get run down ? Generally speaking.
    Correct, (generally speaking)
  • 04-12-2009, 11:25 AM
    Sleeper CP
    Quote Originally Posted by BUSBY View Post
    A lighter boat (which is obviously effected by engine equipment) will be able to get on plane quicker. But without the blower or nitrous, it will cap out. That's where a blower will have an advantage, it will be accelerating later in the run.

    It's not really apples for apples IMO.

    Generally speaking, n/a boats (w/o n2o) are quicker ... blower boats are faster. (again, this is generally speaking).
    I'm sure some people just learned something from that.... thanks. So the blower will pull the bigger impeller later in the run ( like pulling a big gear in a drag car) I understand that. I was wondering if the pump/impeller at 7,200 would/could move more water and give the N/A boat an advantage at the top. It sounds like it could hole-shot and then get run down ? Generally speaking.

    I guess the N/A boat could always sneak a 200hp shot in and pull some more r's on the top but that wasn't part of the rules.

    Quote : "again, what's the goal? "

    To get to the end of the track first.

    Thanks.

    S CP
  • 04-12-2009, 10:58 AM
    Futs
    Quote Originally Posted by BUSBY View Post
    again, what's the goal?

    quick or fast?

    ah, nevermind ...
    Im hearing what your throwing down.

    Way to many variables to even get involved with this conversation....

    Happy Easter!!!
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