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Lego straight 4 engines (2nd generation cylinder engines)
In my opinion, the Lego Technic cylinder engine is a bit too big for my building scale. Therefor I am going to replace the standard engine in my future models. These models are compact enough to fit them into a Lego motorbike scale model.
About this creation
A lot of Lego Technic cars are equipped with V8 engines and motorbikes with V2 or V4 engines. I developed a mk1 straight five engine to make it a more compact. It turned out to be actually larger and from that point I kept downsizing my model. I payed attention to the details and worked as compact as I could. I think it worked out pretty well.


Instead of developing the five cylinder engine further, I created a smaller mk2 inline four engine. I replaced the spring feathers by Lego rubber bands to save space. Due to a lot of stress on the rubber band it felt too sturdy when in motion. The L-shaped gray parts hold the rubber bands and the upper layer of the engine together.


The mk3 straight engine was too straight and too stiff in performance. I reduced the width by shrinking it by a Lego brick size to position the cylinders in such a way, that the crankshaft could rotate all the cylinders in 360 degrees. That resulted in a way too heavy, almost sticky and tend to declining rotation. Above that the engine didn't sound realistic, but forced. To make the cylinder engine both move and sound with a subtle ruff in it, at least one or two cylinders have to be placed in opposite position. That's what I learned from inline engine mk3.


Engine mk3 didn't discourage me to downsize further. From this point I saw more excess and too thick parts then I saw on mk1 and mk2. I scrapped lots of parts and mk4 became one of the most supple rotating inline engines that I created so far. I must admit that mk4 also rotated a bit more supple than the mk6.


Inline cylinder engine mk5 has almost the same capabilities of mk4, but I flattened it out on the height by one brick size. The flattening causes a bit more tensity in the rubber bands. Although mk5 is more compact than mk4, the crankshaft of mk5 rotates a little less supple. The red rubber band was too big in diameter, so it couldn't hold together the top of the engine. Instead of that I used the white one.


First, I thought mk5 was the best I could create, but then I realised that it still has too much parts. I rebuilt, then downsized it. Compared to mk5, mk6 has a super downsized appearance and it has the excellent rotating qualities of the mk4 engine.



I took some pictures of the original Lego Technic cylinder and compared it to my self-assembled inline engines. As you can see, they share almost the same height, but my most downsized cylinder engine mk6 is three brick lengths more compact.







Comments

 I made it 
  April 24, 2014
Quoting Jet Best Very nice, it looks great, but could instructions be a possibility?
Maybe in da future. Right now I am too busy with other stuff.
 I like it 
  April 24, 2014
Very nice, it looks great, but could instructions be a possibility?
 I made it 
  May 18, 2013
Quoting TheLegoNoitAll . Very interesting! love the compact size! you really shrunk down the design! could you show us a video, for a better explanation of how it works???
I'm using this concept for a motorbike. I'll make a video of that, so I hope it will be visible then.
 I like it 
  May 18, 2013
Very interesting! love the compact size! you really shrunk down the design! could you show us a video, for a better explanation of how it works???
 I like it 
  May 18, 2013
Interesting way of making an engine! I take it the 2 stud long technic axles move up and down? Very cool to read through your thought process as it came together.
 
By Siddhart Jaipal
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Added May 18, 2013
 You are at the beginning of this folder. Turbocharged straight-five cylinder engine 'Komodo Dragon Block'
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