The Twingle Split Single Engine used for 70 years 🤯

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In this video we analyze the split single engine also known as Twingle.
We will see how it works, why it was invented and why it fell into disuse.
Also because it was used by many motorcycle brands.
#twingle #engine #turbo #repairman22 #power #speed #piston #horsepower #2stroke #2strokes

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27 апр 2024

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Комментарии : 239

@repairman22 Месяц назад

Touch CC on the screen to turn off the subtitles. I also animate 3D real stories on my second channel: @Trueeventsin3D

@TrueEventsin3D Месяц назад

@aceecaa Месяц назад

If possible, can you introduce this two-stroke engine? Thank you. forum.jorsindo.com/data/attachment/forum/201303/31/232919b8g83fupmr9mrmg7.gif i.ntdtv.com/assets/uploads/2013/03/p3318701a990706700.jpg

@bustjanzupan1074 Месяц назад

Thank you :-) I am telling to people, that Puch was one of the best constructionist at that time 🙂 Pwy 🙂

@Eduardo_Espinoza Месяц назад

@@TrueEventsin3Dhi

@mkuehn5450 Месяц назад

small detail 1:14 'intake and exhaust occur at the same time' research "blowdown" or the time (in crank degrees) the exhaust is open before the transfer port is opened. reducing cylinder pressure to prevent reversion into the tansfers. you're also wrong in your understanding of "torque" which is strictly a function of the power stroke, the piston area, rod length, and crank pin offset. excellent description of the expansion chamber function.

@Alan_Hans__ Месяц назад

I had never seen a twin single engine explained before. Nice.

@robertwest3093 12 дней назад

I didn’t even know that they existed until now!

@Alan_Hans__ 12 дней назад

@@robertwest3093 . I learned they existed 2 weeks ago.

@Turnipstalk Месяц назад

This is the best summary of the Twingle I have seen. You might be interested to know that there was some development towards making a 700cc double twingle for the Mini. It offered being lighter and more powerful than the 4-stroke 850 engine eventually used. The main problem with the Twingle is overrun going down hill where the bores and bearings are starved of oil, the same problem as with the two stroke Saabs. One big benefit of the Twingle compared with a standard two stroke is high torque at low rpm, which expansion chambers don't have. That's why they were ideal for Puch in mountainous Austria. But when small 4 strokes started to get a lot more powerful after WW2, this ceased to matter. And 4 strokes were cleaner and used less oil.

@mikecrimlis3366 26 дней назад

The oil starvation issue was solved with oil injection systems like Suzuki's CCI.

@Turnipstalk 26 дней назад

@@mikecrimlis3366 But it introduces a new problem since plenty of oil is needed because the engine is turning fast but there is not enough combustion to burn it off.

@harrygatto 26 дней назад

The oil starvation problem was somewhat mitigated by using a freewheel (one-way clutch or sprag clutch) so the engine was only at tickover speed on descents.

@Turnipstalk 26 дней назад

@@harrygatto True but this made them illegal in the UK and perhaps other countries as engine braking on long descents was regarded as a safety feature.

@harrygatto 25 дней назад

@@Turnipstalk Yes as this is effectively coasting which is illegal. However, many years ago I owned a couple of Saabs with freewheel in the UK which were deemed legal, registered and with MOT (10 year I think at the time).

@paulcressman2344 Месяц назад

I bought a used Sears Puck 250 in 1975. Interesting engine, lots of low end torque. Wished I still had it.

@proadymx1 29 дней назад

Yes, I remember the Allstate 175 made by 'Puch' and sold by Sears.

@paulreed6089 27 дней назад

250 puch 2 stroke sold by sears was my first motorcycle given to me by my step brother in 1973. Before even starting it someone passing by on the road offered to trade his 1973 DKW Sachs 125 dirt bike for it. So I owned a puch 250 for only 5 minutes.

@phillipzx3754 10 дней назад

Puch engines were also used in the 100 and 125 Penton. The 175 Penton came with a KTM engine.

@leopoldpoppenberger8692 7 дней назад

yes I had a 175 PUCH made by Styria Austria 2 pistons one head .

@kimmer6 16 дней назад

My friend had a Montgomery Ward twingle in 1967. I think Puch made it. The bike had the shifter on the right and the rear brake on the left side, opposite to every bike that I ever rode. It was hard to get used to.

@megapangolin1093 Месяц назад

Amazing, been driving for 50 years, love cars, lived in the town where Bubble cars were made, but never even heard of this engine type. Thank you I enjoyed every minute.

@repairman22 Месяц назад

Thanks for sharing

@clickbaitcharlie2329 27 дней назад

New to me too, looks efficient, expansion chamber on the triumph? (The cornet, @ 3:56)

@terryhetherington3364 Месяц назад

Never heard of the twingle. Interesting!

@williamjmansfield8768 25 дней назад

Yes, At 80 plus I knew of the Puch/Allstate 2550 twingle engine. Like to have one even today.

@MadScientist267 Месяц назад

It's funny, I figured out that the pistons needed to be slightly out of phase with each other to optimize this... and then you mention it. My vision was the second one, 2 independent rods on one journal. I first clicked on this thinking "Why? More friction?" 🤣 -- but it soon made sense.

@stevenmitchell6347 15 часов назад

I can see this as practical for modern 2stroke applications i.e. large chainsaws, outboard motors, etc.

@JoeGator23 16 дней назад

Modern engineering doesn't even think outside the box compared to these marvels from well over 100 years ago. Impressive, especially considering this was done before the age of computers. If anything, we have gone backwards in some respects. Thanks for the cool video!

@squidcaps4308 26 дней назад

Subscribed simply because you didn't put your face in closeup for minutes on screen but instead opted to stay in the margins and using loads of animations as content. I hate the "big face on a big screen staring at me" style that many channels use.

@repairman22 26 дней назад

Many channels use that technique to avoid copyright when using images that they did not create.

@444mopar 5 дней назад

@@repairman22the bobbing head on the screen infuriates me, especially when the thing they're talking about is sitting right behind them but these guys want to see their face on the screen I guess.

@carlnapp4412 Месяц назад

The Twingle Triumph BD 250 was widely used by the Wehrmacht. She was produced in Nuremberg from '39 until '44.

@atburke6258 Месяц назад

In 1964 a friend bought a used Puch 250 SGS that would only go 20 mph. The motorcycle shops could not fix it. I did and got to know the Twingle system. In 1968 I bought one new from Sears as an Allstate. It would not run from new. I told Sears what was wrong and they would not believe a stupid customer knew anything, so they had to refund my money. Too bad, it was a nice bike for its size back then.

@tauncfester3022 28 дней назад

If it didn't run and your friend's bike only did 20 mph, how did you come to the conclusion that they were "nice bikes"? They sound like they were, in your experience, pretty crappy. I own a Ducati 250 I've owned for 45 years and it does 65~70 mph easily.

@atburke6258 27 дней назад

@@tauncfester3022 I said in the third sentence that I fixed it. It ran fine after that. It did more than 70mph, easy. That is why I bought a new one years later from Sears. It was DOA because the local Sears "adjusted" a running bike pre delivery and made it quit working. I offered them the fix instructions and even said I would do it myself right then and it would take less than 5 minutes. They were not about to listen to a dumb customer so I told them to stick it and got my money back. I'm still here and Sears is mostly gone.

@clickbaitcharlie2329 27 дней назад

Pity, nice looking bikes..(ah, good ol' sears..might order a resonator guitar, and a morphia/heroin/coca/syringe kit, while I'm at it?)...my how things have changed?...

@paulnicholson1906 24 дня назад

I have one. It runs great. Starts on the first kick and has plenty of low end torque with good speed although being 70 years old I treat it nicely....

@nathangoshawk 28 дней назад

In the UK there was an odd, but fairly successful, little car called theTrojan. Very plain, simple and economical it was powered by a four cylinder double, split single of 1500cc. Probably the strangest features of this engine were piston rods designed to bend (a little) and a remotely located carburettor some distance from the engine. No passing oddity, Trojan employed this engine from the early 1920's to the early 50's, latterly in (very slow) light vans and also developed a triple, split single.

@realdbcooper3423 Месяц назад

I LOVE THESE VIDEOS, Cause this is the place to go where you wanna go when you think you know all about engines, but theres more to see, and its type of content know one else gives, showing deisgns and internals and explaining in depth from historical point of view to advantage and disadvantages, to all the components, That is next tier level yt creator. Twingle diesel 2 stroke, and mazda patent mixed with twingle? could be cool. LOVE THIS CHANNEL!

@ovalwingnut 8 дней назад

I felt a real tingle when I learned about this Twingle... just saying. You R the "Unique Engine Whisperer"

@NC-xk1eg 27 дней назад

"IN THOSE DAYS" that was fast. It was the fastest thing that Sears sold. The little Sears Compact was actually a close second. The 2 speed Allstate MoPeds were a hoot & used on many, many paper routes. The gas cap was also an inverted cup for measuring 2-stroke oil at fill ups. (A Yamaha FZ-6 IS fast by today's standards)

@theknifedude1881 Месяц назад

I had heard of Twingles but had no clue why they were a good idea. Thanks for the explanation.

@andrewgent5887 Месяц назад

The stepped piston two stroke engine fitted to the Wolf motorcycle on display at the British National Motorcycle Museum is another version of two stroke technology.

@58singleman 28 дней назад

Dear Repairman 22 you might like to do a show on the "Rotary Radial" aircraft engine which was widely used in WW-1. It's the only engine I know of where the crankshaft was bolted to the firewall and the engine rotated around around the crankshaft. It was a 2 stroke engine with the propeller bolted to the crankcase. Sooooo... the engine spun at the same speed as the prop. The Rotary Radial was used by the French, British, and German air force.

@tauncfester3022 28 дней назад

Rotary radials are 4 strokes, every one of them. Some of the single valve Gnomes, what were called "Monosuapape' had intake transfer flutes in the cylinders that were uncovered at the bottom of the stroke but they were all 4 strokes, despite the smoke and 2 cycle style of fuel air transfer.

@maximumengineering5419 27 дней назад

Strangest radial engine was the Fairchild-Caminez. 4 cylinder, 4 stroke that had 4 power strokes per revolution. All done with an ‘8’ shaped cam/ crankshaft and roller followers on the pistons - which were all linked together.

@noahwail2444 Месяц назад

The Danish police used the Puch 250 in conjunktion with the Ariel Square Four. The Puch in towns, and the Ariel on the open road. So whereever they showed up, the bad guys had a hard time. ;o)

@qoph1988 Месяц назад

The Danish police must have loved the back of their engine overheating

@sharpbends Месяц назад

Glad you mentioned the DKW

@user-wo6qn3vf9n 28 дней назад

The Twingle or Twin Angle engine is based on a very crude machine built be Canadian lodgers in the 18th century, it's principle was you hade two vertical pipes positioned together with wooden pistons (made from tree trunks) which would be driven up and down the pipes by a steam pump engine at the top. This was used for making waves on the river used to float the cut logs to their destination for processing. This principle was only used in a small area of Canada where the natural river water flow was not strong enough to float the logs at a reasonable speed.

@NC-xk1eg Месяц назад

I remember the old Sears Allstate 250 motorcycle had this. In those days they were fast! 😄

@maximumengineering5419 27 дней назад

At close to 350 lbs with only 15 HP I wouldn’t say it was particularly fast. Mine topped out at around 65 MPH.

@jobamer7684 Месяц назад

I would have never imagined the Puch 250 to be sold in the USA. As you indirectly mentioned the technology for this kind of engine was already ancient and outdated by the time they were first produced. And I think they were made until mid 70s! Oh and nice video.

@russbilzing5348 Месяц назад

They also made them in 175, 350 and 500cc versions. My dad had a '64 250 and I had a '67 250 I thought his was the nicer looking, but I kept mine for 20 years longer. I rode it from St. Louis to Alamosa, Colorado and all around Colorado Springs. It would only do about 60 mph and I had to draft trucks on the freeway, but it never, ever failed me.

@PRH123 Месяц назад

I had a Puch 50 cc moped, it was pretty bulletproof, and got around 125 mpg…

@andyb.1026 Месяц назад

I had an SGS 250 in '65 (a '60 model) Bombproof and it could keep up with Honda cb72.

@jfu5222 Месяц назад

TWN = Triumph Werke Nurnberg

@clickbaitcharlie2329 27 дней назад

A bantam, anyone?..😂

@RH-xr8ms Месяц назад

I had one of the Sears 250's for about 5 years in the 5o's !

@Max-pi7ri 9 дней назад

Great video, Please cover more of 2 stroke engine designs because very few channel have such detailed explanation about them

@derelictarchive 13 дней назад

I love learning about the innovations of many past engines.

@markrowland1366 8 дней назад

I had a BSA 250 and my friend had a Puch twin. Great fun getting around at fifty with a pip tent. Good god stuf was so expensive in 1966. My parents had a business requiring air freight to be dispatched before school so i got a driving licence at thirteen.

@JC-gw3yo 16 дней назад

I have been a piston head for years, and this is all new to me.. Thanks

@rogerlaredo9527 14 дней назад

I had a Puch 250 in early 70s. It had an automatic oiling system, which I thought was rare for something from early sixties.

@rtzlwitz 11 дней назад

Very good video - very good explained. Thanks for that! I learned riding motorbike in the late 70th on an old, 1954 build, Puch SVS 175ccm with a twingle 2-stroke. The Puch twingle engines ("Doppelkolbenmotoren") were famous for being very elastic with a lot of torque from the bottom. The Austrian "Puch" was sold to USA under the brand "Sears Allstate". Didn't know this since I seen the "SR250" in your video. Once more: Thanks for that!

@user-yz8iw5lw5h 11 дней назад

Thanks. This is a great video, very well explained. Puch engines are still running today. But they have a thermal problem. When driving quickly on the highway or under high loads at a consistently high speed, the rear piston tends to block.

@DownhillAllTheWay 6 дней назад

When talking about fuel mixture going straight out of the exhaust port, don't overlook the fact that the fuel mixture is not being pumped into the cylinder continuously, as is hinted by the animation in the video - the engine only has one crank-case full of mixture to supply, so when the crankcase is empty, mixture would tend to stop anyway.

@peterofenback9263 11 дней назад

Thank you for the easy-to-understand explanation of an unusual engine principle.

@theinspector1023 26 дней назад

Enjoyed the video. Thanks. In England they're called split singles. A wonderful example of the opposed piston two-stroke is the Napier Deltic diesel with three crankshafts. Now that's an engine!

@thepubliceye 7 дней назад

Back in the 60's I had a DKW convertible and a Zundab motorcycle, so yes I heard of the twingle.,

@metricstormtrooper 10 дней назад

I thought this would be rubbish from the narration, but its been brilliant, really well explained, so well that I subscribed.

@jonwatkins254 6 дней назад

I had a friend bought a Puch 250 in 1964. Riding it home (maybe 15 miles) it stuck 3 times. after cool down ran fine. Wasn't a bad motorcycle until Honda.

@jonathancrotts2862 29 дней назад

I got a 66 Sears Allstate 250. It's torquey as hell with the gearing for riding through the Austrian alps, and has ridiculous whiskey throttle in 1st. If I could get a title and parts weren't ridiculously priced, it would be nice to restore and take to car and bike shows. At this point it's just a big trail bike to ride until the piston slap takes it out 😢. I have been tempted to put the engine in something else. It would make a hell of a go kart engine😈.

@captinfubuki9728 28 дней назад

i only know about these engines because we have a really old lathe that uses one sadly no longer runs as the crank broke but it worked well until then besides a rare backfire like thing that it did where it would spray flaming fuel out the exhaust so we started keeping a big metal drum under it

@marcdheere134 27 дней назад

I used to have a belgium made FN 175cc two stroke with two pistons behind each other. It has only one spark and combustion chamber. The special thing on this type is that there is a main piston rod and the second is not fixed at the bottem of the first. It is made like the connecting rods of a star engine with hinges.

@donames6941 Месяц назад

This is the first i have seen this kind of motor

@confuseatronica Месяц назад

the diverging part of the exhaust pipe resonator is the part that reflects the wave back up to the exhaust port. The diverging section slows the gas and the gas behind it hits the slow gas and makes the pressure go up. Bernoulli.

@mkuehn5450 Месяц назад

nope, the divergent part reduces pressure, increasing cylinder scavenging. the convergent part reflects the echo as a physical wave back to the exhaust port preventing fresh charge from escaping by increasing pressure. dwell is the length of the chamber between the two cones, determining the time for the sound wave to return to the exhaust port. effectively tuning the pipe to certain rpm ranges

@billylyman2950 Месяц назад

Great work as always

@repairman22 Месяц назад

Thanks again!

@bobese5099 27 дней назад

Thank you for the educational vid. Never heard of this one before

@adamstobiecki5868 Месяц назад

As a child, i remember hearing my father and his friends talking about a DKW. They seemed to be superior at the time. A lot of good stuff was coming from Germany at that time.

@robertgreen9614 3 дня назад

The BSA Bantam was a DKW design, part of reparations after WW2. Minsk and Harley also "borrowed" this DKW design.

@user-Dr. 29 дней назад

I remember in the early 60's my dad had a Sears Allstate, the engine in that bike the pistons were front to rear, different than the one you show, during the year or two that he owned it, it burned a hole in the rear piston several times, I was about 5.

@furripupau 3 дня назад

The tandem twingle design originates much earlier, in the Trojan utility car. Designed before WWI, but only went into production after the war ended.

@robertgift Месяц назад

Well done! Thank you.

@saylormalan 27 дней назад

Dear, I really liked the video. I didn't know this type of engine. In mechanical books and courses, it is not discussed or shown. I thought this engine was very well thought out.

@ex-engineer6657 Месяц назад

"Fascinating, Jim."

@wapartist 23 дня назад

I want a Garelli 350! 2 strokes are awesome period

@stevehageman6785 29 дней назад

Very cool, thanks!

@paulnicholson1906 24 дня назад

I have a twingle motorcycle. It is a neat piece of machinery. When anybody sees it they are like what the heck is that thing?

@CaseyW491 Месяц назад

This is brand new territory to me. Pretty cool! If I had been considering a design like that, I wouldn't have. It seems unnecessarily over engineered.

@JohnShuty 25 дней назад

Francis! I really enjoy you animation of the many internal combustion engines! It really makes it easier to understand! Have you considered doing an animation of Bernard Hoopers' 2-stroke stepped piston engine? I believe Norton / Triumph made a prototype called the Wulf. I might be interesting to see!

@paulmryglod4802 13 дней назад

Wow i had no idea these engine designs existed

@joedufour8188 26 дней назад

Someone looked at a single cylinder 2-stroke engine and thought to themselves "you know what this needs? More friction!"

@BibboRacing96 8 дней назад

4:42 this is the start of the video I was expecting to see

@MCTeck 10 дней назад

I worked with a guy that had an Allstate motorcycle twingle. It had 2 mufflers and one was missing. It sounded weird.

@edcew8236 13 часов назад

The Germans had an opposed piston Diesel engine in WWII that flew on a six engine seaplane

@HATECELL 19 дней назад

At first I thought this was a 2 cylinder 4 stroke, with the cylinders 360° apart

@maximumengineering5419 27 дней назад

My father bought a new Sears / Puch 250 in 1968 (but it was actually a 1967 model). Looked just like the one in the video. I ‘inherited’ it when I turned 16 (1971). Sold it to a neighbor kid when I got a newer bigger bike. He wrecked it and I talked him into giving it back to me. Frame is long gone but I still have the engine. Great memories! Thanks for sharing this interesting design.

@DownhillAllTheWay 6 дней назад

There was another engine - I forget where it was used - that had two pistons, but they had separate big-end bearings on a single crank pin, so that the timing was different between them - One piston led the other by a few degrees, and that was said to improve scavenging. I may be wrong, but I think it was a Puch engine. Aha! I've just discovered that this engine is discussed at 4:44 in the vid.

@izzatsyahmi5933 9 дней назад

The design is not meaningless actually in 2 stroke era. because you can make the exhaust port bigger by using this design.

@dpeter6396 27 дней назад

I thought I'd seen 'em all..... Wow!

@ludwigreiser4053 28 дней назад

Very interesting - thanks a lot! 👍

@ErickC 16 дней назад

An even better solution is to combine uniflow scavenging with, y'know, exhaust valves. It solves a whole lot of problems. ;)

@iskandartaib 14 дней назад

This "conical exhaust" is what modelers call a "tuned pipe".

@Wiencourager 27 дней назад

Do a video,on the amazing rotary radial in the Adams-farwell cars. Some really original thinking.

@The_Privateer 29 дней назад

That this engine "succeeded" might be a little optimistic and extends a bit too much credit for this engine. Just because you can, doesn't mean you should.

@glasslinger Месяц назад

These engines are now collectible.

@Jarda_B Месяц назад

I have seen one open IN REAL LIFE with my own eyes, I could have even bought it, if I wanted, it was at historical bikes flea market/meet.

@corneliussianturi476 19 дней назад

In my mind when seeing this that singgle connecting rod with mode Y connecting rod, can be usefull for 4 stroke singgle rod with seperating 2 cylinder combustion chamber and share the same cam profile duratin and lift

@ajwalou-nack2343 26 дней назад

Excellent information. I never knew. Did wonder what a single cylinder twin was . Now i can go to my grave in the knowing of all knowledge 👍

@runebel 8 дней назад

Did you notice that the top of the skull fractured on the last shot?

@johnbutera5805 11 дней назад

Yeahhh... simple concept, but wayyyyy too much exposed surface area!!! The thermal efficiency of this engine would be much, much too low to be feasible!!

@bigredc222 4 дня назад

Wow never heard of these.

@GWAYGWAY1 Месяц назад

I thought the Isetta was a BMW250 single engine and similar to the R25 motorbike .

@user-sk5ll9zw7c Месяц назад

It was after bmw bought the manufacturing rights from iso, who designed the isetta.

@ehsnils Месяц назад

A dual piston 4-stroke and you'll have the Alvar (from the first name of the inventor) engine which has the ability to do variable compression. The secondary piston don't have to be as large as the main piston.

@lordvalentine471 3 дня назад

I have a Super 8 mm movie of my dad pulling me on a Snow Saucer with one of these all states

@albinsebastian084 10 дней назад

😂which application are you using to animate this video ?

@jayknight850 29 дней назад

As a kid I had a Sears 250, a twingle, it had the nastiest exhaust sound. Kind of a “blatt blatt “ sound. Maybe efficient but not a pleasant sounding engine.

@herksku9051 27 дней назад

i really wanna see a 2 stroke twingle I4 or I6 for some reason

@nielsdebakker3283 28 дней назад

You could say the honda nr500 and 750 are sort of fourstroke twingles.

@Jarda_B Месяц назад

I have seen one open IN REAL LIFE with my own eyes, I could have even bought it, if I wanted, it was at historical bikes flea market/meet.

@paulusthews1079 27 дней назад

BMW Isetta hatte einen 1-Zylinder 4-Takt Motor... 😊

@zolibartalos 5 дней назад

please make a video about split cycle engines.

@BeingRomans829ed 10 дней назад

Why am I craving Twinkies and Pringles?

@MrDhandley Месяц назад

Surely a direct injection two stroke would solve all these problems. Were they ever made?

@repairman22 Месяц назад

Yes. That's another reason why twingles are nonsense today.

@ErickC 16 дней назад

EMD made millions of them, so, yes. To quote "History and Development of the 567-Series General Motors Locomotive Engine:" "The basic 2 cycle engine design established at this time has been successfully used in the full line of Diesel engines built by General Motors and therefore has been applied to a great many of the Diesel engines in use in the world today. These have all been direct injection, uni-flow engines with air admitted under pressure supplied by the blower to the cylinder through ports in the cylinder liner with the piston acting as the intake valve. The exhaust valves in the cylinder head are open when the intake ports are open, allowing the fresh charge of air to sweep out the combustion products of the previous cycle. Valves and ports are closed at approximately the same time and the fresh air charge is compressed. Slightly before the top of the piston travel, fuel is admitted with very exact control by the unit injector and combustion occurs very near top center to allow full use of the developed power."

@doublenuthex 10 дней назад

lol all i see in two strokes are electrical motion now a days. blue positive and red negative? imagine the piston rings being conductors, and as the energy moves from blue to the path of least resistance, accelerating in a gradual increasing curve, then rushes upwards to red, where it then bends and compresses with enough energy to still transfer to red, forcing the piston back down over-powering the resistance in a pre-determined cyclic path for leverage after it reaches the peak of pushing the piston to the cylinder height, (in a hemi for best arc, obviously) to overpower the threshold after the resistance is built up and then released, while red and blue (intake exhaust) swap like an alternator to repeat the process, esentially creating an electric turbo. it could light the glowplug itself and store that energy in that percise timing for release, too.

@FlorinTamas-ck6ww 28 дней назад

Triumph made one of this. I still have the engine someplace in the attic. Probably the worst 2-stroke I've seen. The flame front has to propagate very far to reach the other cylinder. The piston of the other cylinder (away from spark plug) got severely destroyed by the detonation.

@chinabluewho 25 дней назад

Was hoping for MPG numbers of engine in the BMW

@markworden9169 14 дней назад

Always heard them called split single.

@theharbingerofconflation 26 дней назад

If I turn this into a four cylinder (twin so 8 piston engine) and this is a twingle, because its twin-single, would the new engine be considered a twin-quad aka twad engine?

@UQRXD 27 дней назад

You can have a 2 cycle engine that does not mix oil with gasoline.

@andgate2000 28 дней назад

This is why elec motor is so simple compared.

@camillosteuss Месяц назад

Damn, never knew of these... Pretty cool little thing... Might make one at some point for a lawnmower or similar just for kicks... Shouldn`t be all that hard to make, not with the right equipment at least...