Even though this is a twin engine setup and not twin cylinder, its still very cool and man it sounds way cooler then i would have expected. Nicely done.
I had a motorcycle that was made almost exactly like that back in the mid 1970's. It was a 500cc Yankee. The engine was made with two 250 cc Ossa barrels mated on a common crank shaft. When the folks at Yankee were initially considering the splice, they tried the engine with the pistons firing on opposite strokes so that power was continuous but found that the bike (which was intended for enduros) had a more useful power band with them mated on the same stroke. The power was like that of a 500cc single. They called it a twingle, or at least the riders did. It was massive in the woods. If you had the alternate stroke config. it just spun the tire and the power didn't get to the ground. Wish that I never had let it go.
Before WW2 there was a genuine Twingle aka split single. Two con rods with offset crank pins two cylinders pumping one cylinder head. One on inlet side and one on exhaust. It gave a longer dwell time at TDC but poor gas flow meant no overall advantage. . ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3qWvl9AVfaA.html
You need to time the engines correctly one engine with the piston at the top, and one at the bottom, and make sure the idles are at the exact same rpm. Notice how there’s only smoke coming out of one of the engines. There’s air coming out of both because of compression, not because their both running
my thoughts exactly, the idea is good but i not sure its actually running on two , is it 360 or 180 degree timing? interesting idea for a four cylinder.
@Jade Spale 180 would be ideal because when one engine is at the exhaust stroke, the other would be in the combustion stroke. 180 degree timing would have the best affect on power for a two stroke, I feel 360 degree timing would be best for a four stroke
Actually, you dont "need" one at the top, and one at the bottom, since they both have 1 ignition coil per cylinder, they are both individually timed. (Unless he is using 1 coil to fire both cylinders, then timing could be off) Look at all v twin motors, they are not one up and one down. Id dare say since we seen it had spark on both cylinders, that it must be a fuel delivery issue on the "non smokey" side.
Interesting build, and very informative. Two things that stand out. A carburettor balancer is required otherwise idle will never be stable or you can accidentally run one lean at operating revs, ruining that cylinder. Secondly, cooling is now missing on the number two engine as the fan shroud was removed and no metalwork to guide the airflow from the front engine, or the machined impeller to even slightly reduce cylinder head temperatures. I guess it is a work in progress. Perhaps fitting a multi blade shrouded propeller on the drive shaft, with adequate baffling ,would be able to draw the air past the cylinder and vent it away from the engine.
Pretty cool. I think the cylinder without the pull start would be in danger of overheating if you did any real work with it though. And like others said, putting the two cylinders 180 degrees out would prevent the assembly from rattling apart.
I think I'd try to make a custom dual intake for a single, bigger carb and try to make 2 expansion exhausts. then drop it in a motorized bicycle I'd love to see more people do things with this!!
That would most definitely make starting, and tuning a hell of alot more easy. Although the twins would make higher hp overall, i think the tuning and syncing would out way the power increase for drivability and ease of everything
😁😁😁Alright. Let's put that twin 2 stroke on a bicycle, or scooter and let's see some numbers next. And do a 12 cylinder 2 stroke. This I got to see.👏🏼👏🏼👏🏼
Rear or second engine looks like it is running richer then the first. Since both are supplied via one tank, you may want to richen up the first engine some to keep from heating up... But very interesting build all the same.
dual carbs are actually better but you have to have them adjusted exactly the same. Take them both apart and rebuild them both the same with the same adjustments.
the first engine must be in TDC second engine must be in Bottom Dead Center, engines must be synchronized, when first make the power stroke the second must make the compression stroke.
Only one cylinder is firing not the second he shows with plastic paper that both are firing but only one as smoke is coming from only single as it's 2 stroke engine both should show smoke
No, both cylinders are firing, you can clearly hear it. It must be a carburetor tune issue, the one cylinder that's not smoking might be running a bit lean... Or the one that's smoking might be running a bit rich. Sometimes two stroke engines don't emit that much smoke.
@@kgb5223he's right, I have a two-stroke motohoe and it only smokes when the engine is really cold or when I can't start it first try. It can also depend in the oil you are using...
My uncle built my cousin a go-kart with 2 47cc two stroke engines. Both cylinders would fire at the same time. It felt way faster than it should've been.
I've seen these motors used in 2-stroke friction drive motorizing kits. Note that I mean the single cylinder not the custom twin cylinder you've made. Also, it would be amazing seeing put into action as a custom motorizing kit for pretty much any driveable platform.
Im currently build a performance engine woth one of these. I ported it and polished the exhaust, bigger carburetor, and a home made bracket to move the coil and change ignition timing. Also have made my own exhaust for the project im using it for, which is a full suspension mountain bike. Im modifying the suspension of the mointaim bike aswell to get more travel. Also adding some fender and stuff so it will basically be a dirtbike. Im also figuring out a way to use the stock shifter mechanism to shift it. Maybe maje it a 3 speed, but idk yet.
Very inventive work. Would be nice to have that lathe. Twin 2 strokes sound so mean. Two Walbro carbs and steel tuned pipes is the ticket. Nice work on this one!!
Right engine is not running but still shows the paper moving because of compression escaping through the exhaust and I say this because there was zero smoke coming from the right engine.
@@FirdausIdros Engine is too heavy for drone usage. Sure the power to weight ratio is there, however you're forgetting the propellers would need to be substantial to lift just the weight alone not including the drone's own frame work.
@Rudofaux the drone engine idea is a good one but i would use a 1 cylinder engine and a generator to increase the flying time of the drone ,,I built a prototype of my own with a 38CC chainsaw engine about 2.5HP,it generates 12.5 amps at 36V ,,the entire assembly weighing just over 8 pounds including the rectifier and regulator controller ,,it was installed in a 4ft Octo-copter drone and was able to fly for 83 minutes nonstop powered by the generator alone before a rectifier burned out I have also experimented with building an engine powered drone ,this was a mixed success because while this machine which weighed near 20 pounds had excellent lifting power it didn't have the control of an electric drone .totally mechanical driven the control was accomplished by literally swiveling the arms with the propellers ,,,and finding gearboxes capable of the RPM and loads necessary for this was quite easy ,,,literally ANY strait shafted weed trimmer has a gearbox capable of handling continuous 9000 rpm operation
@@Krasnov_Misha А я сначала думал - какой-нить индонезиец мастерит себе лодочный мотор. У них дофига типа байдарок с моторами от бензопил или газонокосилок. Такая длинная труба, на одном конце винт, а на другом - мотор.
Love the build. Did the same to rc nitro motors though I've been wanting to build one of these to make a custom moped a duel 25cc in a alt fireing flat config. The carbs are not synced, mark the output crank to read rpm, unplug 1 sparkplug@ a time to adjust each running side to match idle rpm.
Won't take long for that rear unit to overheat. The flywheel's fins were cut down reducing airflow & no shroud to redirect said airflow. No airflow, no cooling. Nice little project thou.
that's the first thing I thought too and it's not practical unless you rotate the cylinders 90° and blow the heat to the side and install a shroud on the second motor at least the block the heat from blowing on it from the first one
@@ostolski A decent fan and baffle setup could still blow enough air to cool the rear cylinder without staggering them. Small aircraft such as the Cessna 172 do it all the time with 2 or 3 cylinders in a row.
А бумажка возле выхлопа принудительно вращающегося двигателя это показатель его работы? На видео видна работа одного двигателя. Синхронизация двигателей одной только отвёрткой не выполняется.
У меня триммер не дымит. Развожу "лукойл мото2" и "штиль 2т", 20мл/литр. Триммер "champion" T27. Не факт что двигатель будет дымить. Это вам не планета и не восход. Ещё не меньше от износа цпг и настроек карбюратора зависит.
Very creative I been a small engine mechanic for 40 years and this is good.prob just double fire cute.it would be neat to dino 1 and the other to see if there's much of a difference Great prototype for something better good luck
I would make a homemade boat now put the motor is in that I live in Newfoundland look up the old bolts we used to use they used to use make or break motors Great job
