Needs a bigger coolant reservoir to get rid of the air in the system.

You should design a 12-1 header system. That thing would absolutely scream with one.

I think getting bigger coolant reservoir to get rid of air in the engine and radiator could help. What could also help would be moving the radiator further from the engine so it doest absorb heat from it and it would improve airflow behind the fan. Btw thanks for another amazing video

Mecanic here, my first advice would be that the fluid reservoir need to be sealed because pressure is related to boiling temperature so by adding pressure to your system (the water boiling into steam) your boiling temp is gonna rise (water gonna boil at 110~120°c instead of 100) and so your system will be more flexible for high reving for long time or for a smaller fan for your radiator and my second advice would be to purge you coolant system of any air because the air reduce the flow where the water will pass through just by sitting there, just by doing that you should get more water flow in your cooling system and so reduce the fan size and have a more efficient cooling system (you could do that by adding a purge screw where your cooling tube is highest and one on your radiator, also it will help to place the cooling reservoir at the highest point of the cooling system). hope it will help you

This is the kind of escalation I want to see

Change how your coolant reservoir is connected. It should be used as an expansion tank by being connected with a tee. Having the tank be inline is only causing air to be mixed with the coolant. You can see the air get pulled in when the engine is revved emptying the tank

The exhaust was the key for the sound!! Great video Q.

your recording quality and your work is amazing bro please keep this up love this

The individual coil plugs are a lovely touch, be nice if it had individual injectors too, a full EFI setup on this would be amazing. Run it with an aftermarket ECU and a heavier flywheel, easily get that idle RPM significantly lower and more top end power :)

I would love to see you make a dyno for these engines. I know you made a flywheel dyno before, but have you thought of a water pump dyno?

Fantastic video. The way this thing revs is spectacular. The most impressive is how smooth it revs. Really shows how balanced a V12 really is. Can’t wait to see what you do with it next

3 things I noticed. 1 you need a bigger coolant reservoir and a baffle to stop it from shooting upwards. 2 the fan size isn't the problem you need a fan that can do pressure not necessarily flow. 3 the exhaust manifolds reduce down way too much, looks like it goes down at the outlet to practically a one cylinder size so it has too much back pressure. Anyways hope it helps, great video, thanks for the hard work!

Awesome sounding engine and that throttle response is something else!

Try pressurizing the coolant system to keep boiling controlled. Build a 15 PSI relief valve that leads from the pressurized portion to the reservoir.

Amazing attention to detail!!! Thanks for sharing!!!

Just ran into this video from a car magazine (Motor 1) and I don't have the words to express the amount of talent this guy has..... WOW!

I'm sure there are lots of comments on how to make more power, but just by looking at how this thing idles, it might be worth making the flywheel heavier so that you can bring down the idle speed without the engine cutting out.

Excellent content. As many others have mentioned a closed system and elevating what should be an overflow can might help out. Great work as always. BTW the throttle response is amazing and it sounds like a ripper.

brother now u must slap a turbo on there!

Do you think the air in the cooling system is negatively affecting the engine temp?

Really cool. Sounds great with the headers. As mentioned by others, bigger coolant reservoir is absolutely needed. There's barely any surge capacity in it for when the revs climb and the exiting coolant sloshes around creating aeration in the reservoir directly over the inlet, getting sucked into the water pump, and then frothed into a milkshake, which then becomes a feedback loop. Also, rad inlet & outlet ports should be on top, will make bleeding and keeping air out of the end tanks easier (thereby increasing cooling capacity by keeping as much coolant in the rad), as well as minimizing chances for air pockets to grow in the end tanks that sit there waiting to get purged when coolant flow increases under high revs (this is probably one of the contributing factors to why the tiny reservoir you have now keeps overflowing; air is being ingested and stored in the system, displacing coolant. So... when is the electronic fuel injection system being installed with ITBs and velocity stacks? You know that's the next logical step now that electronic ignition is done ;) Great videos, love watching!

V12 is pretty nice but i'm still waiting for Johny to get his hands on inline 6 especially if it would be dohc. Mini RC Supra would be so cool.

That exhaust manifold is a work of art! It really is a thing of beauty. Awesome work and awesome video 👍

Always a treat getting the notification you uploaded. Was worried there for a while!

I would love to see one of these hooked up to a dummy load, even a BLDC drone motor with the three leads shorted together would probably work to give it a decent load. In addition, a contra-rotating delta fan would be great for this, 80mm but a lot thicker than a normal case fan, I recommend fan grilles too for your safety ;) I use Delta GFC0812DS's Great documentation of these engines as well as your craftsmanship.

Sounds amazing. Definitely need to address the coolant reservoir. A swirl tank to help separate the water and air would be good, as well as a taller reservoir. If you could let the coolant build some positive pressure it would help minimize bubbles. Also you can try a product like Redline Water Wetter which may also help. Should only need that and distilled water.

The sound after the headers is amazing! 😂 love ittt

Your work is absolutely incredible, I was speechless and the sound of the engine is wonderful

Putting this on a scooter or mini bike would be incredible

Man, it runs so much better with the coil on plug design! I think you may need to set up a pressurized cooling system to really get the most out of it. Too much cavitation otherwise causing the pump not to flow as well. Can't wait to see this in a project car. I wonder if Denny from 'Dennis Dempsey's Out of Control' channel got in on this upgrade? I'll have to check him out and see.... Nice work on the fan stuff!😉 *EDIT:* I saw where Chuan Qi is working on a 4? speed trans and clutch setup for these. He's still working out the bugs, but it looks awesome!😄👍👍

That was awesome, thank you for sharing!

The sound with the manifolds on is so good.

i would love to see another project get a supercharger in the future :) you think that rpm would drive enough boost through a centrifugal system to be more noticeable than when you last tried one?

Would love to see this in a Indy type scale car or a Boat of some type. This is amazing content, keep it up !!!

That sound is amazing!!!

…this baby V12 sounds like F1 racers from 90’s! Incredible!

Top demais 👍🏻👏🏻👏🏻👏🏻👏🏻

Just my opinion but a set of equal length headers would make this thing scream like a formula 1 car.

Great video brother!! you covered all the features and upgrades👍👍👍👍

I love your enginuity, the designs and ideas you implement are awsome, keep it going :)

Holy crap that thing is responsive. How much power does it make? (if at all possible to measure)

sounds like an Aventador

Here in Italy the highway code provides that mopeds are two-wheeled vehicles with an engine of less than 48 cc such that there is no requirement for a license to be able to drive them, apart from the age of over 14 (the car license and motorcycles can only be obtained after the age of 18) We are therefore talking about motor vehicles with engines comparable in displacement to your V12 (if I understood correctly, a 50 cc) from my memories, however, the carburettor had a larger air intake hole than that of the V12, in fact usually the carburettor was a "Dell'Orto SHA 14/12" with a 14mm intake duct and 12mm diffuser. it is true that we are comparing a four-stroke V12 with a two-stroke (48cc) but the carburettor of the V12 seems small to me to allow the full power of the V12 to be developed. Another thing I noticed in your video is the presence of bubbles and cavitations in the cooling pipes when you are at high rpm, this brings air into the circuit and therefore could reduce its efficiency, if by chance you have it around the house I would change it also the radiator. Finally, returning to the first sentence of this post, I would like to see the V12 applied to a moped, I think it would provide some nice surprises

Been waiting for something like this

Why don't you make a big engine

Its not a fan problem, you don't have a thermostat in the block. the thermostat restricts the flow allowing more time for the coolant in the rad to cool off. what's happening is the coolant is cycling so fast that it doesn't have a chance to dissipate the heat in the radiator so it starts to boil off. Maybe there's a way to do a remote thermostat but that's what's needed if you are intending to do any extended or high rev use.

The sound difference once you put the headers on is amazing

Always something good to see here!!

I like the coil plug setup, that’s some clean work.

That's a mini F1 engine the way it sounds. That alone is worth making this beauty sing!

That’s really cool as a car guy dealing with this stuff daily

Awesome craftsmanship looks amazing well done 👍🏻 👌🏻

So glad ive found your channel, used to love the builds you would post on retrorides so very long ago, so pleased to see you are still as creative, your attention to detail is stunning !!

Just incredible... Congratulations 👍

Now that's a proper scream!!

Definitely sounds like it likes the exhaust best

wish I had the knowledge and tools necessary to create something as masterful as this. This is awesome 👍🏿

Beast of an engine!

It sounds like a tiny Ferrari with the manifolds on. That's awesome!

11.5K Rpms! Holy crap! That thing is awesome!

Amazing video! What a beast. Ps ive been watching ur content for a while now and absolutely love it :)

1:48 your videos are usually so quiet and peaceful. This makes my teeth hurt.

Great work as always. To further improve cooling you could pressurise the circuit to avoid steam in the system with a spring valve on the cap. A bigger expansion vase would help too.

Imagine mounting sterling engines around the engine to catch the heat and transform it into extra power

you are a very talented machinist

I love what you do man, it's amazing, keep it up, can't wait to see mor RC builds Videos

The throttle response of this little screamer is insane!

the sound is crazy

50cc v12 is insane, can't wait to watch the next engine progress.

Thats best one I've seen so far

Individual coil packs? That's pretty sweet!

Man it sounds good

A perfect candidate for a 90's style f1 scale model!

What fantastic little engine. I would love to see this on a mini dyno tuning for perfection

Lowkey almost sounds like a miniature Lamborghini...I love it

Cool looking exhaust headers

Very cool engine.Would love to see it installed in something and doing actual work.

That's sick!!! Dang!

Yes.. this is awesome. I need to install this on a bicycle.

This is so freaking cool! 😮

Sounds like music. Its perfect!

Needed to add more coolant as it idled to fill in the air bubbles. Water cooling radiators arent going to perform all too well if there's too much air entrained into the coolant. Also, bigger reservoir; I would recommend you make one out of metal pipe as a water-cooling reservoir proper (typically made of acetylene or other form of hard plastic) would not last at those temperatures.

I CAN NOT WAIT to see what you put this thing in!!!

can't wait to see it back in the car

Sounds great man! I want one a bit bigger for a go kart haha

As someone who does FDM printing, metal 3d printing is so dang amazing.

That's the coolest thing ever

This needs to be put into a scale panzer or similar. Epic👌

Like others have said, the bubbles in the coolant is the main overheating problem. The water pump is losing a lot of efficiency and the heat transfer is severely reduced. A pressurized system would probably improve things too but I would start with the bubbles.

Watching this series has been an amazing ride. Wow. As I said before I'd like to see what this dyno's at

Absolutely amazing! I agree with what some others have said. I don't know much about cooling combustion engines. But I do know for a water cooled computer, air in the loop is a big no, no. A bigger reservoir allowing constant flow of coolant and no air may be beneficial. Awesome video!

Was cool seeing with the thermal camera the difference between the hot and cool coolant tube

This content is gold 🙌🙌

I think this may be the best running engine you have shown off

It sounds like a tiny Pagani zonda 😊

Veramente un progetto magnifico e fatto in maniera perfetta, veramente un bravo ingegnere meccanico, congratulazioni

Simply a genius 😊

Awesome ! , it would be really cool to see a cold start in winter, like some are doing with their car! Congratulations for all of your videos, I've been looking a them since the beginning ! 😁🇨🇦

This thing on a moped would be awesome

Damn, that thing screams! Build a miniature Lambo!