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Some questions about nitro boats (IM A NOOB)

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Some questions about nitro boats (IM A NOOB)

Old 10-25-2020, 09:28 PM
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LeagueOfChungus1
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Default Some questions about nitro boats (IM A NOOB)

Hello, I'm considering to build a nitro boat. Is the method to tune nitro boat engine same as tuning nitro car engine? I know how to adjust it.
Also how should I connect fuel tubes? And are there any suggested kits? Thank you. Oh, just one more thing, can I use car fuel for nitro boat engines?
Old 10-26-2020, 01:46 AM
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Hydro Junkie
 
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Okay, let's see how I do answering your questions:
1) You tune it just the same EXCEPT you tune it considerably richer.
2) Most carbs have barbs on them that will take care of holding the silicone tubing on. The fuel tanks normally use a soft brass tubing that is long enough to prevent the fuel lines from coming off.
3) NO!!!! DON'T USE CAR FUEL!!!!!! Car fuel doesn't have enough oil in it to protect the bushings and bearings due to the heavier load it would be subjected to in a marine application.

The 1/8th scale boat I've posted a picture of below is powered by a CMB .67(11cc) that runs on 50% nitro boat fuel. The big difference is boat fuel is mixed with between 16% and 18% oil, roughly double what you will have in car/buggy fuel.

The boat I linked below is a sport 20, powered by a Nova Rossi .21(3.5cc). I use the same fuel in it as I do the bigger boat above
https://www.rcuniverse.com/forum/att...4&d=1375582341
Old 10-26-2020, 06:02 AM
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Thank you! This is a reply that I was looking for.
Old 10-26-2020, 08:20 PM
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How should I connect fuel tubs and water cool tubes?
Old 10-26-2020, 10:13 PM
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Let's do this. Here's a link to a thread I did on building a sport 20 boat:
Re-Engineering A Dumas Pay'N Pak
I covered all the steps, including hooking up lines and driveshafts so you may want to read through it. I know there's a lot of information, including how to modify parts and such, but it will help you build your boat.
This picture shows how I routed my fuel lines through the engine bay, remote needle and to the carb.

Last edited by Hydro Junkie; 10-26-2020 at 10:30 PM.
Old 11-15-2020, 06:55 AM
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kevinsburns
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Originally Posted by LeagueOfChungus1 View Post
Hello, I'm considering to build a nitro boat. Is the method to tune nitro boat engine same as tuning nitro car engine? I know how to adjust it.
Also how should I connect fuel tubes? And are there any suggested kits? Thank you. Oh, just one more thing, can I use car fuel for nitro boat engines?
The fuel tank and fuel lines.
Just like a car there is a pipe pressure and feed to carb.
Normally we use Sullivan Tanks with simple brass tubes that stick out of the cap and have no barbs, for this we just slip the fuel line onto the brass tube. This usually is good enough to hold but if someone was annal they could use a cut pc of fuel tube over the actual tube to make the tube tighter against the brass but really not needed.
What's different is how the fuel tank is made and plumbed. Usually our tanks sit in front of the engine. Our tanks have brass tubes that we bend. Our boats usually turn to the right in ovals.
The pressure tube gets bent upward to the top of the tank into a little notch.
Because our boats typically turn to the right only we place the in-tank pick up tube down low in the corner as the fuel will slosh when we turn.
The fuel tank is what you will want to study up on, everything else is pretty much the same except the longer tuned pipes.
Fuel
Our boat engines run at a much greater rpm for longer time "In the 4000 to 8000 more rpm range on average" (We run full throttle more than a car/truck does, do to long straight aways vs short straights and many turns were simply on the throttle longer and develop higher rpm) Our engines have less load on them too and our props come out of the water a lot so the rpm skyrockets at times. So we need more oil than car fuel. I get my fuel from FHS Oils, been buying it for 30 years.

With todays water proof radio gear don't worry if the radio box is 100% sealed or not, it's not that big of a deal anymore.

Last edited by kevinsburns; 11-15-2020 at 07:08 AM.

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