Prototype Twin Cam Quad Valve DOHC Lego Technic Engine (incremental speed increase to 100% power)

Early prototype engine which is like to make for my studless 8865 Model.
Gearbox seems to be working, now I’d like to create a 32 valves quad valve per cylinder Double Over Head Camshaft
Using crankshaft parts for the camshaft does create some issues, but we will see if I can overcome them
Anyone wishing to view the basic principle for the 4 stroke cycle can see it in real time action. Of course there is no spark
You’ll see the first 180 degrees works the inlet valves, the second 180 degrees compress the air. The Third 180 degrees is the power stroke while the four 180 degrees actives the exhaust valves ready to start the process cycle again
This Twin Cam Lego Engine evolved from first version
• Prototype Twin Cam Leg...
Second attempt with a few redesigns. Still quite weak and did fall apart after a few minutes
• Compact Twin Cam Lego ...
This the final version which you are watching. I tried to see how durable it was which surprisingly, it worked very well
• Full Power. Tiny Lego ...
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• Lego Engines

[@justinheller870]

Patented this Video Idea 😂

[@Legotyres]

Ha! You haven’t seen the bloopers yet where it falls apart in the least dramatic way 😂

[@D8Dozer]

Bro your valve timing is off by years.

[@Legotyres]

Ha, it’s only a tooth out 😂

[@D8Dozer]

@@Legotyres No. It is pff by more than a tooth.

[@Legotyres]

@@D8Dozer ha, that was a joke. As these are prototypes, they’re close enough especially as there are only a handful of twin cam Lego engines which have ever built in the world and shown on UA-cam. Especially this small 😊

[@pyroshock7333]

Honestly if a larger gear was used to spin the piston cam or whatever you call it, the valve timing would match the strokes better

[@Legotyres]

​​⁠aye, you’re right, but Lego isn’t that accurate anyway as the amount of play is quite massive.
Yes you can tighten it by adding a tensioners, then you add more friction plus that even alters the timing to and that then makes it difficult to use with manual products plus the timing issues return
It’s a trade off for something which kind of looks quite cool, enjoyable to experiment with and at its heart follows the basic principles of a real engine 😊
You’re more than welcome to give it a go tho as I’d love to see what you can come up with at this size.
Most fail to get this close unless they use modified parts which is not the case here, nothing has been destroyed in its design and the only none genuine parts are the springs which fit just like Legos own springs with out harm

[@crazytechnic486]

first

[@Legotyres]

Second prototype in a couple of days. It’s a little weak tho and pushing it has caused it to fall apart 😂
Waiting for the 10mm 0.3x6x10mm springs as I’m having to double on 5mm versions as I only 10 of them as a tester 🤪