New guy, couple of jet questions
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New guy, couple of jet questions

  1. #1
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    Default New guy, couple of jet questions

    One more new guy. I have been lurking on the forum for a couple of months trying to gain knowledge but have not much reason to post yet. I recently bought my first jet boat, a '72 Wriedt with an Olds 455 and Berkeley JB-A for a dirt cheap price. The guy I bought it from had owned it in partnership with a couple of buddies and just wanted to get rid of it. The boat measures 17' 8" long. The boat has not been used for a couple of years. The boat is pretty basic with no tach, no diverter, etc. The boat needs paint pretty bad but is otherwise fairly solid. Luckily, I have buddies that own paint shops and others that have owned jet boats.

    The boat needs some minor work and updating. The Holley 4175 650 carb is leaking from most gaskets and the secondaries are stuck shut. The boat still runs, steers and rides good and GPS'd at about 45 mph when I had it out last week with the worn carb.

    Questions:

    The boat has no rock grate at all. As I really don't want to suck up any large objects such as human heads, etc, I want some sort of grate. Would I get any benefit on this type of boat by adding a loader or should I just find a used rock grate? I realize that this boat will not be a speed demon with the current setup 9455, logs, but faster is better, right?

    The temperature guage did not rise very high when I ran the boat last week. It was a cold day, about 45 degrees, but that got me thinking: Should I limit the amount of water that is running through the engine? I think I remember reading a post about installing a water pressure guage. Where would I install this?

    Sorry for the newb questions, but any help is appreciated.

    John




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  3. #2
    Senior Member Widetrack's Avatar
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    First off Hello! Now to your questions!
    Yes a loader may help with MPH some so don't think it will speed you to 70 MPH! LOL!
    The carb is something you need to take care of first! (safety issues)!!!
    Then the loader pad area may need the holes threads retaped if it has been a long time since one was on it!
    On the temp issue I would not worry about a gauge that is more for higher speed apps. But you may check to see that you have a valve right at the pump for safety and to regulate the incoming water. Close it off a little at a time and run the boat watching temp to get it about where you want it!
    Being that the temp that you were runing in was 45* the water temp may have been lower and it will be hard to build temp in the motor anyways! Hope this helps some! WT


    Coby


    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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    Senior Member ICECREAMAN's Avatar
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    MY .02 I would just find a stock grate, don't think a loader is going to do much for your application. As far as the water, think your thinking of a pressure regulator. Nothing wrong with a pressure guage for refrence. You don't want to restrict flow in, but you do want to restrict pressure in the block to 12-14 psi. Thats a very short and easy answer that will easily be debated, but you can do a search and find several threads on water pressure, hose routing, hose size, engine cooling. Then you can decide what works for you. Hope this helps a little, Greg

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    Thanks for the quick replys. Carb is already off the boat and I am in process of tearing it down.

  7. #5
    Senior Member Widetrack's Avatar
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    If you want a stock grate I have one I will send you if you pay the shipping! If thats what you want! But a loader does help some over stock grate! JMO! Most of the time stock jet boat setups running logs don't use bypasses or gauges just let it flow and enjoy! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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  8. #6
    JRPM/e-PerformanceMarine Squirtin Thunder's Avatar
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    You may want to contact Glen Dilworth, he is local to you, Jet Dynamics 209-2878-2437 or 208-678-7038. If you can't get ahold of him send me a pm and I have another # of someone who can.

    Good Luck
    Jim
    Jim & Amanda Rich
    CJ 72 & 53c

    JR Performance Motorsports

  9. #7
    Senior Member harley222's Avatar
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    Welcome, ur temp will change when its summertime so before you change things ya might want to wait to see were ur at then. i have a edelbrock 650 that i just rebuilt and ran for a day and it works great, make me an offer and its urs. i would go with the loader thatthe guy said he would send ya(great gesture by the way) and go that route. and you can always keep an eye in the spam section for upgrades for ur motor. These guys are great and know tons, just ask and they know it. well injoy and let me know if ya want the carb..

  10. #8
    Senior Member ol guy's Avatar
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    Quote Originally Posted by ICECREAMAN View Post
    MY .02 I would just find a stock grate, don't think a loader is going to do much for your application. As far as the water, think your thinking of a pressure regulator. Nothing wrong with a pressure guage for refrence. You don't want to restrict flow in, but you do want to restrict pressure in the block to 12-14 psi. Thats a very short and easy answer that will easily be debated, but you can do a search and find several threads on water pressure, hose routing, hose size, engine cooling. Then you can decide what works for you. Hope this helps a little, Greg
    Good info. Don't cut water intake but hold it in the engine longer. Being that you are running logs cut the exit line diameters first. Those old hulls are classic but heavy as hell. They are built with a BIG hook for driveability and smooth ride. You can toss every grate at it but untill you get the motor issues handled,It's a waste of money. Even with the OLDS 455 it should see 4600-4800 rpm tuned proper. Get that then look to underwater hardware. ALTHOUGH top speed out of that hull and engine-pump combo I would say 60-65 max on the speedometer. IMLAO M

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