What's the difference with motor housings?

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  • Howard
    Senior Member
    • Jun 2011
    • 194

    #1

    What's the difference with motor housings?

    Does anyone know the reason we use boat motor housings which are vented (have holes in them) as opposed to using a motor that doesn't have any vent holes (Mostly used in cars) I've seen sites advertise both type for boats. Is there pros and cons on the best to use?




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  • sundog
    Platinum Card Member
    • Feb 2009
    • 878

    #2
    For cooling purposes. A cool motor will last longer. Cars and trucks are frequently in dirty, dusty situations and benefit from sealed housings, but boats aren't bothered by dirt and can afford to have holes in the housing to help cool the motor.
    Legend 36 sailboat, KMB Powerjet Ed Hardy Viper, ABC jet pwrd BBY Oval Master, ABC Hobby Jetski, NQD Tear Into's, HK Discovery 500, MickieBeez pwrd Jet Rigger!, Davette/Gravtix jet sprint, KMB Powerjet Pursuit, NQD pwrd Jet Catamaran!,Steam pwrd African Queen, Sidewinder airboat, Graupner Eco Power

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    • LarrysDrifter
      Big Booty Daddy
      • May 2010
      • 3278

      #3
      You said it. Boat motors are vented. When a hatch is taped down, there is no air movement. In a land vehicle, there is air movent. Do the holes really help in a boat? I dont know, but, they dont hurt. If your boat motor is getting hot, vent holes arent going to help. The problem is in the setup.

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      • Howard
        Senior Member
        • Jun 2011
        • 194

        #4
        So here's a few more questions / theories.

        If your motor is not getting hot is it OK to use a sealed motor? Also I thought another reason for the vents is to help drain the motor if it gets water in it. If you get water in a sealed motor it's hard to get out. And if thats the case and you use a sealed motor should any thread holes be sealed with silicone to make the motor waterproof?

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        • Howard
          Senior Member
          • Jun 2011
          • 194

          #5
          hope that last post makes sense

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          • LarrysDrifter
            Big Booty Daddy
            • May 2010
            • 3278

            #6
            Ive used sealed motors in boats. They run just fine. If it gets wet or submerged, remove the motor, take the end bell off, blow it out with compressed air. Dont get the air gun too close just to be safe. Use wd40 or my preference, Corrosion X sprayed inside. Let drain a day or two. Re install and run. Thats how I do it, and it works for me.

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            • Steven Vaccaro
              Administrator
              • Apr 2007
              • 8721

              #7
              Originally posted by Howard
              So here's a few more questions / theories.

              If your motor is not getting hot is it OK to use a sealed motor? Also I thought another reason for the vents is to help drain the motor if it gets water in it. If you get water in a sealed motor it's hard to get out. And if thats the case and you use a sealed motor should any thread holes be sealed with silicone to make the motor waterproof?
              If I have a sealed motor thats gotten wet. I remove it and spray corrosion x in the mounting screw holes and let it sit.
              Steven Vaccaro

              Where Racing on a Budget is a Reality!

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              • Howard
                Senior Member
                • Jun 2011
                • 194

                #8
                Thanks for the good info. So has anyone ever sealed the threaded holes and rear wires with silicone? Would making it waterproof be harmful because of the lack of air?

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                • LarrysDrifter
                  Big Booty Daddy
                  • May 2010
                  • 3278

                  #9
                  I wouldnt worry about doing any of that. Its really overthinking it. Just do as Steve or I do if it gets wet. Silicon never sticks anyway. Save the silicon for sealing harware mounting bolt holes.

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                  • siberianhusky
                    Fast Electric Addict!
                    • Dec 2009
                    • 2187

                    #10
                    No issues with a wet motor, my tunnel comes in with a wet motor every run. Just lube it at the end of the day, replace the bearings when it needs it.
                    If my boats upside down then who owns the one I thought I was driving the last two laps?

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                    • martin
                      Fast Electric Addict!
                      • Aug 2010
                      • 2887

                      #11
                      I dont think you get as much cooling from vents as you might expect, to get air flow through the motor you need an internal fan in the motor. Thats why outrunners have them, + being in an airtight enclosed space in the boat dosnt help. Take the Leopards that have vents, on the shaft end theirs a plastic type disc up against the end cap blocking of the vents also when you bolt the motor to most mounts that also blocks the vents of completally if its the end cap mounted mount your using. All you have left is the vents the other end & 1 of them has the wires coming out so theirs just 3 vents left with no flowing cool air coming through the boat either.

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                      • Steven Vaccaro
                        Administrator
                        • Apr 2007
                        • 8721

                        #12
                        Originally posted by martin
                        I dont think you get as much cooling from vents as you might expect, to get air flow through the motor you need an internal fan in the motor. Thats why outrunners have them, + being in an airtight enclosed space in the boat dosnt help. Take the Leopards that have vents, on the shaft end theirs a plastic type disc up against the end cap blocking of the vents also when you bolt the motor to most mounts that also blocks the vents of completally if its the end cap mounted mount your using. All you have left is the vents the other end & 1 of them has the wires coming out so theirs just 3 vents left with no flowing cool air coming through the boat either.
                        Anything is greater than nothing. I've run both versions. the vented cans run cooler. If they did not run cooler, I would carry the sealed cans and be able to sell them to a wider market.
                        Steven Vaccaro

                        Where Racing on a Budget is a Reality!

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                        • martin
                          Fast Electric Addict!
                          • Aug 2010
                          • 2887

                          #13
                          I fully agree any extra cooling is welcone but i wouldnt be worrying if i allready had the enclosed end caps.

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                          • m4a1usr
                            Fast Electric Addict
                            • Nov 2009
                            • 2038

                            #14
                            Originally posted by Howard
                            Thanks for the good info. So has anyone ever sealed the threaded holes and rear wires with silicone? Would making it waterproof be harmful because of the lack of air?
                            You cant seal RC motors enough to be called waterproof. The bearings have enough clearance to allow water migration just by the force of gravity. Let alone some type of pressure difference. While open end bells are better (IMO) sealed cans have proven themselves in our hobby.

                            John
                            Change is the one Constant

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                            • Steven Vaccaro
                              Administrator
                              • Apr 2007
                              • 8721

                              #15
                              Originally posted by m4a1usr
                              While open end bells are better (IMO) sealed cans have proven themselves in our hobby.

                              John
                              I agree John, but sealed can were all we had in the past years. Aveox, Hacker, Feigao and Lehner. Lots of motors are going vented now. Even Feigao has a vented model these days.
                              Steven Vaccaro

                              Where Racing on a Budget is a Reality!

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