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Question for GN-7

  1. #1
    Senior Member blurred vision's Avatar
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    On my 454 to 540 you asked what cam...specs. What would you suggest?
    thanks

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  3. #2
    gn7
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    Quote Originally Posted by blurred vision View Post
    On my 454 to 540 you asked what cam...specs. What would you suggest?
    thanks
    I'm sorry. I don't do requests. But thank you. Thank you very much.(in my best Elvis voice)



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    gn7
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    I only asked that because after engine size, the cam is a huge player in the boost department. and it gives "false readings" per say. You can have a small short duration cam with big boost, and no power. change nothing but the cam, same blower and speed, with a longer cam, less boost, but more power. And we were talking about blower sizes and overdrives. Hard to figure boost numbers with out the cam specs, but I guessed you weren't going toooooo small. or toooooo big.

    As for what you need. What type and size of boat, cat, v bottom 18 ft flat, and drive system, and use of the boat. You going full tilt racing.

    With a blower, in a recreational boat, I would stay away from solid rollers. You don't need em. With the blower you can keep the Rs down and still make power. You don't need to wring the motors neck to make good power for a rec boat.



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    Senior Member blurred vision's Avatar
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    Boat is a HTM SR 24...Max machine 1,50 Bravo one....Use the boat as a havasu sand bar runner....

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    gn7
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    Heres the problem with me picking a combo for your deal. The exhaust. If you get carried away with the duration youn get into water reversion. Every thing I know about camming a blower motor flies out the window with wet exhaust. I what to thow some duration at it, but the exhaust is a problem. Best to get with a engine builder that builds motors for marine application with wet exhaust.
    If your looking to buy cam, contact Cstraub on these boards. I'm guessing the exhaust duration is going to be in the 230-240, with 112 or 114 LSA.
    If the exhaust was dry I would be talking more like 260-270.

    By the way, if you didn't buy the 950 carbs yet, I wouldn't. Great carb, works on almost any motor. But really doesnt flow much more than a 750. It isn't what people think it is. You would be happier with a set of 850 blower carbs.



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    Last edited by gn7; 10-13-2010 at 04:38 PM.

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    Senior Member blurred vision's Avatar
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    Thanks for the Info....I think it has blower 750 carbs set up by teague...The only thing about the cam thats in it,,,,I remember the duration the blower shop told me to get was 250 on the duration......I couldnt run my 750 s on the 540 motor could i....possible to re-jet....

  9. #7
    gn7
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    You might be able to use a 250* cam. Whos exhaust system is it. The system itself is a huge deal as well. Waht were the specs of the cam in your 454. As for the carbs, you are right one the edge size wise. I would run em. You are going to have to jet them much. The cams are not really affected by the engine size on a blower deal. All they really see is the blower, and air flow. Carbs do, what carbs do best. They adjust for air flow changes. They don't much care what causes the change. If anything, they may run alittle richer on the top end. Buyt I would run them before buying new carbs. And Like I said, I would think 850s more than 950s. I love the 950. Quite possibly the best carb Holley ever made. But not for a blower motor. Even there blower 950. I think a 850 will flow more air than the 950 will on a blower.



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    Senior Member blurred vision's Avatar
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    Exhaust....Lighting Headers....to 6" thru hull tips......

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    "If you get carried away with the duration you can get into water reversion." Can you explain this a little more? I think I may have this problem!

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    Quote Originally Posted by flatcrzy View Post
    "If you get carried away with the duration you can get into water reversion." Can you explain this a little more? I think I may have this problem!


    Since this question comes from Boise, I expect that Bob (GN-7) will refer the question back to RattleCanLou. Afterall, this place is governed by geographic region.

    It just wouldn't be right for Bob to give you an answer..................

    But I'm sure that he will.....................
    Originally Posted by Rattle Can Lou
    Again, if I came across as a v-drive snob..I apologize,
    Mike

  13. #11
    gn7
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    Quote Originally Posted by CampbellCarl View Post
    Since this question comes from Boise, I expect that Bob (GN-7) will refer the question back to RattleCanLou. Afterall, this place is governed by geographic region.

    It just wouldn't be right for Bob to give you an answer..................

    But I'm sure that he will.....................
    Your kidding right. Asking RCL about this is like asking him about setting strut angles. Some things are just best left to the professionals. I don't dress in a Santa outfit, build puesdo GNs or and I pay my rigging bills with real money.



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    gn7
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    Quote Originally Posted by flatcrzy View Post
    "If you get carried away with the duration you can get into water reversion." Can you explain this a little more? I think I may have this problem!
    Water reversion is only a problem if you have wet exhaust. And really critical if you have injected "wet" stacks like Bassetts, or your exhaust exit is below the water line on offshore type exhaust. Its caused by too much overplap in the camshaft. In a blower deal it is usually only a problem when idling or just off idle. Some seem to think it is never an issue with blower deals, but they still have manifold vac at an idle and are just as susceptible as a N/A.

    Edit: If you are running injected headers, you can put in a valve that only opens the water when the motor goes into boost, using the line from the manifold to the valve.



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    Last edited by gn7; 10-17-2010 at 09:31 PM.

  15. #13
    Liquid Louie flatcrzy's Avatar
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    I think I'm going to go ahead and Ceramic coat my headers and run them dry, then I don't have to worry about it.Because I'm running water injected Bassetts and trying to keep the chrome nice means running a lot of water!
    Last edited by flatcrzy; 10-18-2010 at 07:02 PM.

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