50cc World Speed Record - 144.891 mph!
I came across this last night at the following link: http://buddfab.net/
BUDDFAB STREAMLINER
50cc Landspeed motorcycle
BUILT BY
John Buddenbaum Metal Fabricator And Eric Noyes Engineer
MOTOR
2002 Arpilia rs50, water cooled, six speed, Metrakit performance parts
FRAME
1&1/4 " x .095" mild steel tubing, full rollcage head to feet, stressed aluminum paneling
BODY
Fiberglass, hand layup over a male mold, polyester resin, 60lbs, 13 feet long
GOAL
Our goal has been achieved, the BUDDFAB STREAMLINER is the worlds fastest 50cc motorcycle
This is a remarkable accomplishment with only a 50cc engine. I think it goes to show boat racers that set up is extremely important and can be highly rewarding in terms of speeds achieved.
That's only 3.0506406 cubic inches. WOW!
thanks,
Paul A Christner
3 Attachment(s)
"Amazing What A little work and ingenuity does"
Paul this is awesome,now just imagine if we took this and applied it to outboards. I've posted pics of the engine and the dyno sheet also for those who choose to view. And if you go to the website Paul has listed there is also a video. Makes me wonder what the Quincy "M" would do. Not to get into it to much but come on,we haven't even reached the speeds these outboards are capable of because of restrictions. I know you don't have to say it, if it wasn't for the restictions it wouldn't be racing. Then why do we keep looking for the ultimate speeds we all so dearly want to reach. Heres a start a 50cc engine going 144.891 mph. Thanks Paul
I think this engine would be illegal for outboard racing
The engine seems to have a turbocharger on the outlet end of the expansion chamber. Under present rules, I believe that would make it illegal for outboard racing unless the rules have been changed recently, but very interesting and just shows what untapped potential there still is in two strokes for power output. Porting arrangement/timing would have to be different from what we have now it would seem, to keep the turbo from overcoming the advantage of the expansion chamber.
Back in the mid 80's I saw a Merc V-6 turbocharged at a kilo in Moorehaven, Florida on an Allison type boat. They did not have all the bugs worked out at that time and were not very successful. The modification was done by Land & Sea, who also had another engine there with expansion chambers but no turbo.
To answer Bill Boxell's question
Stanley Leavendusky Sr. built a 100CC Komet Go-Kart engine for Eileen in the early 70's, using the slipper clutch and chain drive arrangement that was standard on the Kart's of the time and mounting it on a tower housing he built with Merc clamp brackets. The most difficult part of the whole project was starting the motor, as it did not have anything but a nut on the end of the crank shaft that accepted the normal electric starting motor used by Kart racers of the time. We took an automotive starter, reversed the rotation of it by changing the internal wiring so it would turn the opposite direction, as the Komet ran the opposite direction as the automobile engine the starter was designed for. I have some video somewhere of starting it in the water and Eileen reving it up and then the clutch engaging, prop turning and throwing a rooster tail, and then going out and on plane. We had different sprocket sizes to change gearing but were giving up 25CC to the common "M's" of the day, so that and a lack of other motors to compete against worked against it as a successful project. It started and ran well but the biggest problem was carrying the heavy automotive battery and starter out in the water. Best I remember the starter was 6 volts so the battery was heavy. We had previously tried to start it with a rope, but with the high porting it had by being designed from the start to be started with an electric starter, no requirement for low end because of the slipper clutch arrangement it was designed with, and also the not so great ignition system on it at the time, that would not work, so we were stuck with an electric starter if we were going to make it work.
One of the most interesting things was since it was chain drive, we had to rig up an oiling system so as to keep the chain lubricated. We used an aftermarket windshield washer/pump system that had a rubber type bag that held the lube and a diaphram type pump that was designed to mount on the floor board of the car and then be pumped by your foot. I mounted it in the middle of the keeling pad and Eileen pumped it a couple of times each lap with her knee and the open end of the hose from the bag was located over the chain and dripped on it. If you oiled too much you came in with the back of your jacket oiled up, as the chain was running without any type guard, so she learned to use it sparingly. We used a similar type system on another 125 built from Honda parts that had a gear driven balance shaft and necessitated the gears having to be oiled. On this motor we used a small amount of oil in a container that was pressurized by crankcase compression to force the oil thru a carb jet and onto the gears, enough to do the job but not enough to cause a mess.