Mechanical Magic of LEGO Technic McLaren P1 42172 (7-Speed Gearbox)

[@Guywithahat123]

Wow! Lego gearboxes are so cool. I would like a tutorial for 8 speed gearbox one day! Truly an amazing video

[@Unbrickme]

I already have an explanatory video for the gearbox of the Bugatti/lamborghini/ferrari kzbin.info/www/bejne/Y5bCp4KAmd6bfZIsi=F2HByEKkqD3_kwJ3

[@Guywithahat123]

Noice

[@Guywithahat123]

❤❤❤

[@frog_man-2]

shocked me how it had 8 transmission modes. Ultimately an amazing video

[@Unbrickme]

Well actually 7 speeds sequential would be very difficult to implement. It would require some sort of new pieces that can shift at 51.4 degree intervals (not exactly the number since you can’t easily divide 360 by 7)

[@timtimgo_lego]

As a designer I'm a big fan of your work and highly appreciate your content. It is always a pleasure to watch and listen to your videos. What you mediate is the pure joy of Lego Technic. It is very stunning how you achieved all the calculations in literally no time. Last year I made a Ferrari F40 from the Daytona with a very accurate and realistic working 5+R speed transmission gearbox inside. Being a fan of gearboxes like you, you can feel cordially invited to check it out. Best reagrds

[@gregmaster2611]

Please share the part numbers for the lego motor and attachments you used in this video. Thks!

[@TinkeringJohn]

I was amazed how small the V8 engine looked compared to the transmission.

[@MinecraftTransformers]

Looks awesome 🎉

[@Unbrickme]

@@MinecraftTransformers this gearbox is awesome!

[@dcpow]

Pretty interesting stuff going on here! Great editing, BTW!

[@klaus.sfc01official30]

Unbrickme be like: "i am good at boxing, gearboxing specifically"

[@suspense_comix3237]

I would actually be surprised if LEGO Technic incorporated an Automatic Transmission in their Supercars. And yes, I know, real life Automatic Transmission Cars have computers and electronics that also monitor the speed, but there have been a few people online who have actually made Automatic Transmissions via differentials and the white clutch gear. I would like to see a full-on LEGO Technic Automatic Transmission though.

[@Unbrickme]

Yes I agree! I’m sure some sort of torque sensor could be developed for the control+ system and then we have an automatic transmission. I don’t think differential with clutch gear is such a great idea. Gears inside the differential will slip, or the clutch gear will be so worn out that it won’t function properly anymore

[@DripEntity]

Hey I was going to try to make a distribution gearbox for my 42821, and was wondering if you had already made one that I would be able to see?

[@Unbrickme]

42821? What’s that set?

[@DripEntity]

@@Unbrickme the 2021 pneumatic tow truck ???

[@DripEntity]

@@Unbrickme oh my bad, sorry I mean 42128

[@Arnovanderschaeghe]

Good vid keep going unbrickme

[@Unbrickme]

Thanks, will do!

[@andrewentwistle9694]

What is the motor unit you are using the turn the wheels? I am currently building this model and I want to run through the gears like this.

[@TinkeringJohn]

I will watch this video after I get mine and assemble it. I don't want to spoil the fun of experiencing it myself.

[@Unbrickme]

Sounds good

[@TinkeringJohn]

@@Unbrickme The McLaren P1 came and I will start on it. I just assembled the 42177 Mercedes-Benz G500 and the 42175 Volvo truck and excavator. Today, I extended the booms on my Liebherr Crawler Crane with some parts I ordered from Lego.

[@leafy4755]

That is ultimately very advanced and impressive!!!

[@Unbrickme]

Yeah this gearbox is amazing

[@leafy4755]

​@@Unbrickme I really had to put my brain and eyes to the test to figure out where the arrows were going and I had a couple slip-ups. Man, I did not expect to be homeschooled like that... And this is a LEGO set! This is extreme...!

[@Unbrickme]

Trust me, making this video, with all those arrows, and trying to figure out the exact travel path of each speed was also very difficult for me. The gearbox is quite compact so it’s easy to get confused

[@leafy4755]

@@Unbrickme If only this gearbox was in a LEGO set with more playability. I'd be shifting gears all day.

[@ansonchiu5447]

Hi there, I have just finished building Box 1 and noticed an issue that I’m not sure if you’ve encountered as well. When I reverse from upshifting to downshifting, or vice versa, the ratchets tend to jam one shift action before it works again. I’m quite confident that I built it correctly and followed the arrow directions on the orange cylinders.

[@eldunari6676]

I can’t speak for others, but it’s likely you’ve made an error in building because I have not encountered this issue.

[@Unbrickme]

Check that the shifter drums are properly aligned

[@iamhugry]

If you turn the gearbox 180° you'll get an insane torque gearbox that speeds up making it perfect for moc builders trynna build an tractor or semi truck with high torque whilst not waiting to add many many motors

[@MustangBasssman]

I wish I could unsee this amazing piece of technology I love Lego

[@Unbrickme]

I know right! It’s so incredible

[@lukabagaric9327]

It's just crazy how advenced lego technic is getting!

[@ob0273]

Great video. But since the last set I bought is 42043, I cant keep up with all the new gears... Can you please make a video explainer of all the new gears? Thank you!

[@Foxatography]

Do you know how the friction holds up in this drivetrain? As in does the motor struggle with the higher ratios and/or did you test driving it with your hands and seeing if there were any slips or cracking from too much friction like the previous models? When I had the Lambo, it would often crack in certain gears from the high friction when pushing it by hand long enough.

[@Bluemethyst]

i just finished assembling this set, so great to see what i just made all explained to me! great video

[@Unbrickme]

thanks. did you enjoy playing with it?

[@Bluemethyst]

@@Unbrickme it sits perfectly above my desk, I love it

[@blk_lies]

Can you test the loss of energy from the gearbox?

[@brantbasting]

Just got the new Porsche GT4 I might pick this P1 up and try to integrate the transmission into the new electric motor. I also want to increase the steering angle to allow for better turning radius. Then build something fun on top.

[@Mocsfromscratch]

Great explanation about the gearbox! Btw, 3 months ago, I made a video about how the gearbox works in the 42130 BMW motorcycle set. It was inspired by your video about the gearbox of the 42115 Lamborghini set.

[@Unbrickme]

@@Mocsfromscratch oh wow that’s cool thank you so much! I’ll take a look at your video

[@jacobcoopervfx4674]

Hey, my gearbox is a bit sticky. It occasionally jams during shifting, and it doesn't sound as clicky as the ones I've heard in reviews. I'm not sure what the issue could be?

[@RoadReality]

Same here! And the "neutral" gear... jams up the works for me. I just finished taking the whole gearbox apart and will rebuild it, see if I screwed up somewhere.

[@mariovelez578]

Hi, I'm wondering if you'll make a review for more sets such as the G 500, since you mentioned you'd make a review for it. Hope all is well

[@Straetos]

Are the gears in the gear box supposed to move when the rear wheels spin? Cos uh... mine dont. And it shifts infinitely.

[@pseudoty]

Amazing can’t wait to order mine! Do the tires/wheels squeak when you push the set? Saw that in another video thought perhaps it was a build error.

[@Unbrickme]

@@pseudoty how can they squeak? No I don’t think they do

[@CrazyMax-tq6ww]

I don't understand the gearbox operation from the arrows. It was clear to me from the diagram with the timing of 1:44 . I would like to see the same diagram but for the gearbox itself

[@ytka88ua]

Hi. I can't really figure out why, but I have a sticky gearshift. I have tightened all the parts, but the sprocket is slipping because it takes a lot of force. She tries, but she can't make the switch. Sometimes she can make 1 switch.

[@LOLuniverse08]

Is there a way to tell which gear it's in just by looking at it?

[@D-Bri]

For the uninitiated and not all that knowledgeable about gear ratios, are you able to produce or provide a link to run through the comparison between lego gear ratios in these engines vs either the other lego technic supercars or their respective real life counterparts?

[@pangolin_bricks]

Super useful breakdown - thanks! Interesting how high 7th is

[@Unbrickme]

@@pangolin_bricks yeah it was very surprising

[@RoadReality]

Great review of the gearbox! I just finished Bag 9 and have my paddle shifters installed... and the gearbox is crunchy. Shifts are not smooth, and the "neutral" gear in the gearbox... jams up the entire gearbox. Any tips? I was very careful building it, and the orange drums with arrows on them line up... now it's just not functional. I tore the gearbox apart and will rebuild it using the online instructions - do you know if they're any different than the printed ones I've been using? Thanks!

[@ГеоргиЦочев]

I have the same issue, did you managed to fix it?

[@teddi_tqt]

This is a great review. The gearbox looks so refreshing and snappy compared to the Sian. I havent bought this set yet but I think if I do, I would not want to complete. I will leave it half naked like the video because it’s so much more satisfying to play and watch the pistons move.

[@Unbrickme]

Honestly on the finished car it’s very easy to take off the rear part to see the engine and gearbox. I suggest completing it

[@fieldie]

Does this build include spaces to fit motors into the model? Like some Chinese knockoff models do?

[@ericplayzgames245]

Pls review the rc Porsche

[@shampo0oLWD]

At 1:39 I see you have the U-joints properly connected, but in the manual at step 277 it shows it to do it wrong. Is this an error in the building instructions? And thanks for this video, it's very informative!

[@Unbrickme]

Yes it’s an error in the building instructions. Universal joins have to ALWAYS be properly aligned to work correctly. Or else they might transfer speed inconsistently

[@VersatileFunDesigns]

Wow, this was a super informative video and I'm hyped for the full review! 🤩 How many building phases (numbered bags) did the gearbox require? I already built the 42179 Planet Earth and Moon in Orbit without instructions (using the 3D view) so I wonder how difficult the P1 will be!

[@Unbrickme]

It required almost the entire first instructions

[@VersatileFunDesigns]

@@Unbrickme Wow, thanks! 😲 This gearbox sounds very advanced! ✨

[@JacobSmith-fh3kb]

I'm going to buy a bunch of the new transmission parts on pick a brick. Does the 12t clutch gear mesh with a regular, double bevel 20t gear? I need to know because I don't yet own any 20t spur gears.

[@beasty241]

I'm having a problem where my pistons move in forwards drive but not in reverse

[@LOLuniverse08]

when i pull on the right paddle shifter, it shifts the gears down. Did I make a mistake when building or did lego get it wrong?

[@NicklasGR]

So I built the gearbox and I attached a motor to see it working. I realized that only 6 speeds are working. The 7th speed is not even there. I can send pictures and videos by email.

[@falldog9]

Hi, I don't understand much about these sets. Is this Lego set motorised and does it actually move and a have a remote control to drive it? Or is all movement just manual?

[@Grow_tf_up]

Just manual

[@freespeech5691]

So i got the set myself and using the paddle shifters when going into neutral from 1st when you press it the gear doesnt fully move 45 degrees you gotta press it again to finally push it into neutral is it a bad issue?

[@BIGKUBUS]

i have built whole set and when im moving wheels engine is nit workin😢 do you have some solurion for this

[@asatalkin]

Did you fix it?

[@MarinoGodwaldt]

I am building de car now but as i am building end trying the gears they don’t go smooth and i only have 2 or 3 positions. Is that because i haven’t finished yet or because i don’t have the thing in the middle in de right position of did i make a mistake building the gearbox?

[@Grow_tf_up]

You haven't finished it because you need paddle shifters to shift and also fake electric motor to shift all 7 gears

[@derdxnni504]

Hello ich wanted to ask you if it is normal that by moving the car forward and Backward in the Mode where the pistions are moving a slight cracking . Is this normal

[@paul-henridautreppe6563]

Still waiting for the perseverance motorisation..😢

[@technicstudio5636]

Are u coming on bwz camp this year? :)

[@Unbrickme]

No. It’s very expensive to get myself all the way to the other side of the world. I’ll try next year though

[@Gh0ztley]

Help please, my engine doesnt work. The v8 engine doenst move when the wheels turn and i have no idea whyyy.

[@Straetos]

I'm having the same issue. And my wheels and gearbox aren't moving at the same time.

[@XianneTV]

wow! awesome!

[@Unbrickme]

thanks. do you have this lego set?

[@XianneTV]

@@Unbrickme No :( i wish i have. All my lego sets are from supporters and form giveaways. my parents only afford to buy me non lego sets but i am very with the support i get before form the community i was able to feature real lego sets.

[@EasyMachine]

love it

[@Unbrickme]

thanks. what is your favorite lego Technic car?

[@bricknplay]

This is incredible! Now imagine a Pneumatic engine with this gearbox!

[@Unbrickme]

That would be truly insane!

[@suspense_comix3237]

@@bricknplay I wouldn’t really put a Pneumatic Piston Engine under the hood, unless LEGO decides to make a Pneumatic Piston Element that’s VERY SMALL, but I would put a Pneumatic Rotary Engine, kind of like one that would be found on some Mazda Sports Car. Rotary Engines take up less space and it would seem practical for LEGO. But, you know, then you’ll have to shave on functionality, which could be a pain.

[@bricknplay]

I don’t know if you heard about them, but there are Lego pneumatic engines that use the Lego engine block pieces as cylinders.

[@suspense_comix3237]

@@bricknplay Wait, do those use modified pieces?

[@iamhugry]

Just replace the fake V8 and electric motor with an medium and small electric Lego motor

[@iamhugry]

Now we need a mad lad to put an rc v8 engine into it and a small electric motor

[@Bentley-sr6sn]

Who is exude for the full review

[@Unbrickme]

Me

[@kruppelkruppa8662]

Interesting (that they didnt build in a reverse gear)

[@DX88]

Didn't expect to be doing calculus doing a lego video but there we go!

[@Unbrickme]

No calculus here just arithmetic. If I made a tutorial on how to make a Lego Segway, lots of calculus there

[@williamdemler24]

Something to remember: The engine powers the car, or the electric motor kicks in and handles some of that (or all of it?). When the engine is showing high RPM, you are in 1st gear or another low gear. At the highest gear, which would be "OD" (OverDrive), the engine RPM should closely match the wheel RPM. Now, let's buy a sound brick, connect it to a lithium battery block tied to a 2.4GHz remote, and throw some engine exhaust notes into this car. 🙂 Other bricks are available, and they throw off a "dash" of steam with a red light shining through it, for more "effects". It is easier to supply power to these cars using motors connected to wheels. See if there is a way to power the car by putting the power to the actual source of power, the simulated engine in the back. Most R/C upgrades drop the engine and the tranny for room for the extra parts. Next, figure out a way to go through all of those 8 speeds using a remote. I would LOVE to see this kit drive, 1st, 2nd, etc. to 8th gear and steer right or left, all remote control. I don't have the talent to figure this out, but I know MOC designers do.

[@poubellos9623]

Nice gear knowlegde. Are you an engineer?

[@Unbrickme]

Not an engineer. Maybe I’ll study it

[@alexeecs]

I'll just pretend I understood anything

[@AverageSunfush]

No pressure, N O P R E S S U R E

[@MohamadHaziqMohamadNazryFpps]

can some one explain why the 7th gear is the slowest

[@Unbrickme]

Can't do that I'm just an intern

[@Unbrickme]

Sorry about that. I have an intern replying to all of my comments. The real reason why the 7th is the slowest, is because the wheels spin at the same speed. So, in a real car, the engine works at the same speed across all speeds, and so the output in the wheels, changes speeds. 1st makes the wheels slowest, and the 7th makes the wheels spin the fastest. I am powering the wheels using a motor. I am not powering the engine, and we are not looking at the resulting speed of the wheels. So, you just gotta think in reverse. If the wheels spin at the same speed across all speeds, then the engine will change speeds, but it will be the opposite. So, the highest speed will make the engine work at the slowest speed, but the lowest speed will make the engine very fast. Does that make sense?

[@MohamadHaziqMohamadNazryFpps]

@@Unbrickme yup now i understand

[@MohamadHaziqMohamadNazryFpps]

@@Unbrickme thanks

[@LoganSmith-e6l]

Good morning I AM 14 years old, I have loved watching your videos they have been very good inspiration for me to build other things. I'm very good at building in Lego technic would you like to see some of the things I have built myself ?

[@DzieXik]

It's cool, but until touch it, I never understand.

[@jonneldayrit7145]

I have problem with the mechanism

[@jonneldayrit7145]

Hi I have a problem

[@williamdemler24]

Definitely quite a complicated assembly. It's going to take a lot of time to get it right, double checking everything. The flaw I see in this design is the same flaw in all the 1:8 cars that use at least one or more rubber bands. Using the wrong ones will provide too much tension and may cause issues. According to "Common Sense 101", rubber bands will dry rot and break over time, snapping apart and falling off or into some other part of the car. Yes, I know. It's just a plastic toy car. By the way, Amazon and other sites want $$.$$ for replacement rubber bands, unless you can find them cheaper on other sites. Get spares, and expect them to get installed later on. Tweezers or needle nose pliers might come in handy.

[@Daniel-nh7xj]

3 weeks and still no video :(

[@Unbrickme]

Sorry, will try to make content fast! Already filmed building process for McLaren and emirates boat but the rest I probably won’t do building process for, maybe just some clips of the set before it gets completely covered with panels or something

[@Daniel-nh7xj]

@@Unbrickme oh cool! cant wait!

[@dinhtuan752]

happy bday An special??????????

[@Unbrickme]

@@dinhtuan752 happy birthday

[@soopafamicom]

I don't get it. Spend all that time building them in the lambo, porsche, ferrari and bugatti and they just sit on the shelf. It's the most boring poart of the build.

[@Unbrickme]

This video explains the gearbox of the Bugatti and Lamborghini and Ferrari. It focuses on the gearbox of the Lamborghini but it is basically identical to the gearbox in the Bugatti and the Ferrari kzbin.info/www/bejne/Y5bCp4KAmd6bfZIsi=LlPtJYmuz0dFjvsN

[@techni-cmate4746]

I hope next time you place the Motor in proper location , not in "reverse "/in the wheel Because that's how you can explain well the outcome -Shalom