[Question] Plumbing Help with Log Header on a BBC 454 and Motor Install Tips
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Plumbing Help with Log Header on a BBC 454 and Motor Install Tips

  1. #1
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    Default Plumbing Help with Log Header on a BBC 454 and Motor Install Tips

    Iím new to the website and new to the jet boat world. I bought a 1994 commander jet boat with a stock 454 and water cooled exhaust. I believe it has an American Hydro Pump. I just had the motor rebuilt and its ready to put back in the boat, "I bought the boat with the motor already removed". My main question is how do I properly run the cooling hoses to the motor and exhaust to prevent over pressurizing the motor cooling jackets and still provide enough volume to maintain the engine temperature within its nominal operating range? Does anyone have any diagrams with locations of pressure regulators, pressure relief valves etc....? I am installing the motor, rewiring everything and having the interior redone. I plan on doing all the work myself except the interior. I have restored several cars but not a boat. Any help, advice, smart ass comments, suggestions....will be greatly appreciated. Also need to know what should I set the timing at and do marine motors use vacuum timing advance? This is a stock motor with stock pump. Any other tips or problems to expect during this install please voice your experience. I am all ears!!


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  3. #2
    tintingsandiego krusn56's Avatar
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    If your running log/snail...I would run a hard line from pump to gate valve, then a garden hose fitting(to run fresh water thru your system at home) And so on....
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    Default Thanks for the diagram

    What is the difference to of the Logs and Snails? Is the water cooling the exhaust any in the Snails? I have seen people talking about putting pressure regulators in the cooling system, where would these b located?

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    tintingsandiego krusn56's Avatar
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    Water is hot by time it gets to the snail but needed to keep the hose(hose to tip) from melting. On this type of exhaust all you need is a gate valve and set the valve to engine temp. Olds and Chevys need the water flow set and fords are fine wide open on logs/snails. Keep it simple but if you change to headers....thats different.
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    Horsepower sells Engines lefty's pride's Avatar
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    It totally depends on what exhaust you have...... when he says log/snail it is an all aluminum exhaust manifold with a riser at the end this exhaust heats up the lake water in the manifold and cools exhaust. This is what is found on lots of family boats they run cool enough you can touch them. I donít suggest running a "gate valve" (ball valve) they are not wife friendly I mean they take adjusting and other people that donít look at gauges and cook a motor by not adjusting to Lake Temp. I run a thermostat bypass system works great. any way if you have steel headers and there is water going to them that is another style and lastly heads no water over transom only.... all make a difference so tell us or take some pics and we will tell you what you have.
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    Default Exhaust

    Thank yall for the feedback, I have the aluminum snail/log exhaust. I currently have the motor pulled or I would send some pics. I have the boat completely gutted. You mention having a thermostat set up, how does this work? Do you have a thermostat just a regular automotive motor would have located on top of the manifold? If this is the case how does the exhaust maintain cooling water flow through the logs? Sorry if these questions sound stupid, I have been a fan of jet boats since I was a kid and this is the first one I am restoring.

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    Default Exhaust

    Currently what Im working with lol
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  10. #8
    tintingsandiego krusn56's Avatar
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    Quote Originally Posted by sweat50 View Post
    Thank yall for the feedback, I have the aluminum snail/log exhaust. I currently have the motor pulled or I would send some pics. I have the boat completely gutted. You mention having a thermostat set up, how does this work? Do you have a thermostat just a regular automotive motor would have located on top of the manifold? If this is the case how does the exhaust maintain cooling water flow through the logs? Sorry if these questions sound stupid, I have been a fan of jet boats since I was a kid and this is the first one I am restoring.
    Look at the chart...your pump sends it in under pressure and your logs get cooled first, ect....water temp sender to dash gauge is fine. Go to the boat pics page and have a look around at some of the engines.
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  11. #9
    Horsepower sells Engines lefty's pride's Avatar
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    Ok so logs easy. The thermo stat kit i am running is 540-160200 from cp performance. the way it works there is a valve on top of the thermostat when it is closed this valve is open allowing the water to bypass the engine keeping logs cool and the motor warm. when it does start to open it closes this valve and pushes water through the motor, it plumbs in the diagram at the inlet for the water pump plates to the top of the thermostat housing thatís it two more hoses and it mounts in the stock location. I love this system. It keeps lots of water running through the logs, if you run a "gate valve" i find the logs heat up a little more and the motor takes a lot longer to heat up. If you run nothing like my boat had for 30 years it just never makes it there. If you use an automotive style system i find that the temp is very erratic jumping up and down. As far as the pressure i donít run anything to control the pressure never had a port to do it but Iím going to see this year whatís up with that. So there are two ways to run a bypass valve and regulator. Bypass blows off excess flow out the back these are mounted after the jet for the most part. Some guys will say this style your dumping extra speed out the back of the boat. The second system is a regulated system it just blocks excess flow from entering the engine keeping it going out the jet. if i decide to run one it will probably be a reg. last but not least a sand strainers most are not running one but.... depending on the lake it may be a good idea to run one so far i have not found one i wanted to run other than one it like 500$ though. Lots of the cheaper ones will only handle low pressure though. Hopefully this has answered all your log questions any other questions just ask. I missed the comment on the vacuum advance on the ing just use a locking plate to junk it. you donít need it because the loads on the jet are always the same itís not like your climbing a hill or descending like you would in your car. There is a kit out there that has a thumb screw for fine adjustment that takes its place those are cool to.
    "Horsepower sells Engines but torque wins races."
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    Default Thanks

    Thank you guys very much for the feedback, I now have a better understanding of how the system works. I will post pics after the motor install. Thanks again

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