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  • High mileage vehicle

    Anyone got some great ideas on how to build a high mileage go-kart for the SAE competitoin? Any veterans here who could share some tips?

  • #2
    We sponsored a local university for a autocross type race car. It made noise layed rubber and was wacky looking but fun. Is youre project for gas fuel mileage .

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    • #3
      Make a pedal powered go-kart and hire Lance Armstrong to drive it in the competition.

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      • #4
        Have a look at:
        http://www.bath.ac.uk/mech-eng/ecomarathon/ecocar1/

        and

        http://www.bath.ac.uk/mech-eng/ecomarathon/ecocar2/

        Search on "Shell mileage competition; lots of hits...

        hth,

        Ian
        All of the gear, no idea...

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        • #5
          Wear really baggy trousers. Underneath have hidden a bunch of small yet powerful rodents. A small hamster wheel linked to the transmission and cleverly disguised as a directional aid. Slip rodents inside and let em run. If they slow down poke em in the ass with a sharp pointy stick. Good Luck Dont get caught.

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          • #6
            Machine a small cavity in the engine somewhere to hold an ounce or two of nitromethane...
            Free software for calculating bolt circles and similar: Click Here

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            • #7
              pay mucho attention to aerodynamics. This means your driver should probably be lying down head first (if that's allowed, I don't remember), so that the body of your can taper down to a point at the back. Make it light--composite structures are good, especially since it's relatively easy to make aerodynamic shapes with them.

              Chain drives are more efficient that gear drives. Also pay attention to your gearing, so that you're running the engine in it's most efficient range. A continously variable transmission would be a great thing.

              Bike wheels are probably a good choice, especially if you inflate them a lot. You should probably only have three wheels--less rolling and air resistance that way, and drive only one wheel, that way you can avoid having a differential.

              Those are some basics. I'll probably think of more, and sorry if you know all that stuff already--that's just the stuff that came to mind (we considered entering super-mileage, but are doing FSAE instead).

              -Justin

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              • #8
                Try not to over steer, you bleed off energy everytime you correct with the wheel.

                Obviously a smooth surface with a good wax job on the finish.

                Hard tires would roll easier then inflatable.

                Black is the fastest of all colors for a paint job. If you're not afraid of terminal velocity paint a number 3 on it large and proud.

                Don't put an "On Star" system in it. The antenna will cost you in coefficiant of drag.

                Enclose the undercarriage.

                Don't put brakes on it. (Actually you'll feel like you are going faster than you are without brakes)

                If memory serves me correctly, shape the front like a sphere and the rear like a half to a point so that it looks like a falling droplet. Recent aerodynamic revelations indicate that our thoughts on aerodynamics are actually 180 degrees backward from reality. Maybe someone else can confirm if I have it right or wrong. I heard of this research about 2 years ago.

                good luck, post pictures !!
                - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                It is true, there is nothing free about freedom, don't be so quick to give it away.

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                • #9
                  Hello,

                  When I was in grad school, we built a high mileage car for SAE, with an aluminum frame, cycle wheels, and the body was shrink wrap over an aluminum skeleton. The engine platform was specified by ASE and was a 5hp Briggs/Straton with any modifications allowed. We converted to OHC by using the head from a 50 or 70cc Honda and used an external chain to drive the cam. Beyond that, I don't remember, as it was about 25 years ago (my wife says I have a good memory, too bad it's so short).

                  Good luck!

                  Instrkdj

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                  • #10
                    Put a V8 Mercedes diesel engine in it. I hear they are getting up to 60 MPG now.

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                    • #11
                      My high milage vehicle!








                      http://neufellmachining.com
                      Last edited by dneufell; 11-28-2011, 12:11 AM.
                      www.neufellmachining.com

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                      • #12
                        Thanks for all the suggestions! I like the nitromethane idea! We have been using three wheeled frames with shrink wrap over a conduit skeleton. I wish we had aluminum but all of our material has been donated by a student and all we got was steel. Not that i am complaining with steel prices being what they are.
                        Our major downfall i think is the inability to coast; all the other teams shut off thier engines and coast down to about ten miles an hour before they start back up.

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                        • #13
                          No coasting means you have drivetrain friction. Make sure your tires are rock hard, overinflated a few psi. You have good bearings (oil bath would be nice as opposed to greased)and perhaps most important make sure you have a one way clutch somewhere in the drive system so the engine isn't slowing you down when you coast.

                          Also get rid of the steel if you can swing the cost.

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                          • #14
                            We tap the race out of the bearing, clean 'em, spray a little wd-40 in there and reassemble. Pretty drastic results; talked to a guy in the go-kart racing field and he said they've been doing that for a long time. Not that great for wear though! We have a centrifugal clutch so it can coast, only we have no way of shutting off the engine and since the clutch acts as the one way freestyle, the any resistance there is multiplied by the ratio between the two sprockets...

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                            • #15
                              Has anyone studied the effect of suspension on fuel mileage? I suspect that eliminating any energy absorbing areas, like shocks, will increase efficiency. Tires are the first shock absorbers, get rid of them. Somehow.
                              I seldom do anything within the scope of logical reason and calculated cost/benefit, etc- I'm following my passion-

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