Blow through Carbs dont work
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Blow through Carbs dont work

  1. #1
    Senior Member Hass828's Avatar
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    Default Blow through Carbs dont work

    Yeah, right. Someone needs to tell all these guys because they think that they do work.
    C&S or CSU , both at the top of the game.

    Heres what we're talking about.
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    And some of the fastest open boats out there have them.
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    Last edited by Hass828; 10-11-2013 at 07:14 AM.
    "if we keep doing it the same way we always do..we will always get the same results"
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    LP-25.com Infomaniac's Avatar
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    Sorry but the last one in that list of pics doesn't work. I know because it's local.

    The rest of them run really well.

    Apples to Apples? If you are reacting to what Brian Macy said, it's not apples to apples.

    A hard run in a jet is a constant RPM. A monkey could tune it.

    A hard run in a car is leaving on a brake and shifting who knows how many times. A challenge to tune.

    I'm not speaking for Brian but I would guess 90% of what he tunes is a vehicle that shifts.
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    gn7
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    Quote Originally Posted by Infomaniac View Post
    Sorry but the last one in that list of pics doesn't work. I know because it's local.

    The rest of them run really well.

    Apples to Apples? If you are reacting to what Brian Macy said, it's not apples to apples.

    A hard run in a jet is a constant RPM. A monkey could tune it.

    A hard run in a car is leaving on a brake and shifting who knows how many times. A challenge to tune.

    I'm not speaking for Brian but I would guess 90% of what he tunes is a vehicle that shifts.
    I will add that what Info said gets MUCH worse with alky like Turbo Nova mentioned. Each shift changes the velocity and pressure drop thru the carb that it has to recover from. The viscosity of alky along with the volume of fuel involved makes this a much harder thing to account for than gasoline.
    By the time you get to the point of needing a Dominator, its pretty much out of hand. Very few N/A alky dominators work worth a shit, from the very best carb tuners. Trying to move and control the volume of alky thru a blow thru dominator on a engine that is varying the RPM AND LOAD with every shift while trying to accelerate as quickly as possible is an almost impossible task for anybody. TIME is against you.



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    Last edited by gn7; 10-11-2013 at 09:10 AM.

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    Brain is a fuel injection and wiring guru, so I highly doubt he is going to change his opinion on carbs. We know you like the blow thru carbs Haas, but other people have just as much passion about fuel injection and both have there place. Having an open mind about different ways to achieve things is what makes hot rodding great!

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by Infomaniac View Post
    Sorry but the last one in that list of pics doesn't work. I know because it's local.

    The rest of them run really well.

    Apples to Apples? If you are reacting to what Brian Macy said, it's not apples to apples.

    A hard run in a jet is a constant RPM. A monkey could tune it.

    A hard run in a car is leaving on a brake and shifting who knows how many times. A challenge to tune.

    I'm not speaking for Brian but I would guess 90% of what he tunes is a vehicle that shifts.
    Were are we at again? Oh yes, a boating forum. Maybe thats what happens when you get a car guy giving advice on a boating forum.
    If a Monkey could tune it then why is yours still sneezing after two yrs?
    Last edited by Hass828; 10-12-2013 at 06:34 AM.
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    Quote Originally Posted by Oldelmn8tr View Post
    Brain is a fuel injection and wiring guru, so I highly doubt he is going to change his opinion on carbs. We know you like the blow thru carbs Haas, but other people have just as much passion about fuel injection and both have there place. Having an open mind about different ways to achieve things is what makes hot rodding great!
    I'm not trying to win him over to the carb world. But dont want to let others that might be reading this and considering some form of forced induction to read some of the BS and get the idea that the blowthrough stuff doesnt work.
    As far as EFI vs the carb in the jetboat world, all one has to do is watch and see who has trouble and who doesnt. They both run just as hard when they are "right". Its that staying "right" part that is important though.
    Last edited by Hass828; 10-11-2013 at 11:00 AM.
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    Senior Member Hass828's Avatar
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    One other thing, the methanol carb works just fine. I have witnessed it in action. But I will say this, with the amount of reliable power available with gasoline, I dont understand why anyone would consider going through all of the trouble to try to run alky. But thats just my .02
    "if we keep doing it the same way we always do..we will always get the same results"
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    gn7
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    Quote Originally Posted by Hass828 View Post
    One other thing, the methanol carb works just fine. I have witnessed it in action. But I will say this, with the amount of reliable power available with gasoline, I dont understand why anyone would consider going through all of the trouble to try to run alky. But thats just my .02
    First, you are not allowed to pull the "PERFORMANCE BOAT SITE" card here. I try it with the LS and more so with the POS Honda S 2000 and find out its ALL THE SAME. Cars, boat, airplanes. Makes no difference. The LS and Honda S2000, and anything with more than one cam and 2 valve per cylinder are king. The LS is only King because, well, because its the LS, and that's all that matters.

    As for the alky thing, used in the same sentence with gasoline and power? Shame on you. You never want to go down that road with anybody that has ever ran methanol, or even ethanol. NO COMPARISON!! NONE!!

    There is a reason there are gas classes, and why alky is not allowed in gas classes. The gas cars would have NO CHANCE. AT ALL! It isn't a little more power, its a shit load more power! At 9 to 1 with 20 lbs of boost? Maybe not. But then who is stupid enough to do that with methanol? If they do, then they are stupid enough to not make any more power.
    '
    As for the methanol blow thru Dominator. By the time you need a dominator on meth, you should have already switched to MFI. There is a reason that MFI rules the meth classes.



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    Last edited by gn7; 10-11-2013 at 11:10 AM.

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    God those things are ugly!

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    Quote Originally Posted by twoblade View Post
    God those things are ugly!
    Its the perfect carb for a LS. When you cover your eyes to keep from seeing everything else under it, you hardly notice the carb.



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    Quote Originally Posted by Hass828 View Post
    Were are we at again? Oh yes, a boating forum. Maybe thats what happens when you get a car guys giving advice on a boating forum.
    If a Monkey could tune it then why is yours still sneezing after two yrs?
    Agreed about the boating site thing. You knew he does mostly cars and he didnt say they wouldnt work on a boat.

    Mine only sneezes when it's having mechanical issues. Like low compression and rocker stand bolts pulling out of the head etc.

    I will say that my EFI system does not react well to mechanical anomalies. It uses CID manifold pressure and RPM to do fuel calcs. If it's down on CID (rocker not working) or a cylinder not firing well it throws it off by compensating the entire engine.

    Metering fuel via air flow does have it's advantages I guess. When the engine is broken it works much better than EFI.

    But I wouldnt trade it for a carb any day. The only issue I have had with the EFI system not being right is when I had partially clogged nozzles.

    Put over 100 standing start QE passes on yours in a few months time and see how well everything stays perfect. You don't run alky because you don't race. Only one of those "race" boats are running gas because they are targeting a gas class.
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    Quote Originally Posted by gn7 View Post

    As for the alky thing, used in the same sentence with gasoline and power? Shame on you. You never want to go down that road with anybody that has ever ran methanol, or even ethanol. NO COMPARISON!! NONE!!
    Bob, I know that alky has the potential to make more power than gasoline, DuHHH. What I was getting at is you can make all the power ANYONE needs in an open jet with gasoline. So why build a 9.4-1 engine and only use 12psi of boost and insist on alky?
    "if we keep doing it the same way we always do..we will always get the same results"
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    Quote Originally Posted by gn7 View Post

    At 9 to 1 with 20 lbs of boost? Maybe not. But then who is stupid enough to do that with methanol? If they do, then they are stupid enough to not make any more power.
    '
    .
    I would tell ya who, but he hates it when I point that silly sh-t he does out.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Quote Originally Posted by twoblade View Post
    God those things are ugly!
    Function before form buddy. Lets see your beauty.
    "if we keep doing it the same way we always do..we will always get the same results"
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