Large Scale Model V8 Engine - PREVIEW

[@0120raptor]

Mine arrived a couple of days ago.There`s quite a few problems. 1) All 8 spark plug washers are the wrong ones.They are all horribly distorted to the point of not sealing at all. Might be worth checking yours. 2) Oil pump belt WAY too tight. It`s actually bending the water pump shaft.Needs the mounting altering. 3) You need to rotate the rotor arm relative to the inlet cam to alter the timing.Turning the cap does nothing. 4) Cams are very badly machined and also badly designed.Put a DTI on the base circle and at least on mine I`m getting a deviation of 0.45mm.!!!!!!!!!!!!!!!!!. Should be zero That`s huge considering the total valve lift is only 1.3mm . A "pointy" cam is the worst possible design for roller followers although it would be ok with flat tappets. I`m in the process of machining up 4 new cams with a lot more duration. 5) There`s a restriction in the flat plate under the carbs. Holes are too small.

[@DerKrawallkeks]

Thanks for your opinion! I think that these engines are built very weak on purpose to reduce the work in development and reduce the stress on the parts. That's why all the carbs, intakes and valves I've seen on these china engines are very small. The Conley V8s seemed to be very different quality. Still amazing what they're making now, and it can only improve. Plus the price is already remarkable

[@paulklasmann1218]

It's Chinese after all. I'd be surprised if it was good out of the box.

[@DatBlueHusky]

what you expect for china pos, they build these quick to be just barely working to make money. Its the only reason these exist because they know its money maker per unit sold compared to selling many products for cheaper.

[@rayhai6781]

@@paulklasmann1218 I would expect a good running engine for 3000$...and no missing nuts/screws whatsoever...

[@charliemaybe]

for an engine this expensive, these problems shouldnt exsist at all. I mean I know that the machining takes a while and the lower production numbers makes economies of scale non excistant, but the quality should be put into these engines to allow for simple assembly and running in no time, there shouldnt be these pretty major quality control issues. I wouldnt want to spend thousands on an engine only for mounting brakets to be re fabricated, cams not even close to functional, screws and shafts that are bent or missing, and the entire thing just isnt built well. With the low production volume and price, I would expect the engine to work flawlessly with no extra work needed on my end, probably test ran to ensure prefection on such an expensive engine, and better CQ to catch these glaring issues. I would love to get one, but even at half the price I wouldnt want this because of the issues, fabricating and machining rerquirements to get this running, and just the lack of any support.

[@sg34qw]

around 3:10-3:20 you can see the spark jumping from the wire to the boot on the last cylinder on the left hand bank.

[@chiron9536]

how in the world did you even spot that???? 😦

[@Gamer-nc8qp]

good catch

[@TheManLab7]

@@chiron9536 probably was watching it on a 1000" TV

[@sg34qw]

@@chiron9536 adhd lol. i notice stuff most people miss all the time

[@Laz_Arus]

I saw that also. Helps to be watching on a big monitor. Seems like there are quite a few quality assurance issues with this model.

[@al3xuk]

needs a supercharger i think

[@Karto86]

or twin turbo

[@rian0xFFF]

I would test it with an electric turbo

[@TheManLab7]

DEFINITELY!!

[@Moistpotatoman]

YEAH

[@techroma1984]

If you look at the other videos, forced induction with these tiny engines is tough. The tolerances and bearings need to be super tight

[@tiporari]

There's no accelerator pump on those carbs, so on throttle opening they go lean. Richen the mixture slightly and that should help. Not sure if the intake has two planes, but if it does, synchronization would be necessary to prevent stumbling on acceleration. Additional flywheel mass may help smooth out running at the cost of throttle response. Valve seats and seating may be poor, lapping in the valves or just more break-in will help starting and idle stability.

[@DoRC]

If it calls for straight 20 weight oil you might want to consider using straight 20 weight. I don't know where you would get that but 20w50 is going to behave like 50 weight oil at temperature and the manufacturer may be counting on the oil being thin at temperature to properly lubricate everything. I'm not sure what their design tolerances are but if they're expecting 20 weight and you're giving them 50 weight at temperature that could be a problem

[@patx35]

Another option is 5w-20. Performs like straight SAE 20 oil at operating temp.

[@DoRC]

@@patx35 Yeah that would probably work just fine. I just worry that oil being that thick might not be able to get where it needs to go and do what it needs to do. It's also going to cause a lot of drag in the motor.

[@MrHBSoftware]

your assessment of the oil is wrong....the multigrade oil 20w50 has a weight or viscosity of 20 but lubricates like if it was a 50...thanks to the additives....so its still a 20...has the viscosity of a straight 20...with the advantage of protecting like a 50..... for example on modern diesel engines they used 5w30 but now are switching to 0w30...they both lubricate and protect like a 30 but the 0w is much thinner resulting in less friction and more efficiency.

[@DoRC]

@@MrHBSoftware That's not how it works. 20w50 Multiviscosity oil is designed to have the cold viscosity of 20 weight oil when cold but the hot viscosity of 50 weight oil when hot. Essentially it doesn't thin out as much as a single grade oil as it heats up. This allows It will be thin and flow well when cold yet not be too thin and lose its ability to work properly when hot. Look it up.

[@itself227]

@@MrHBSoftware @DoRC is right. Watch Project Farm's videos on oil comparisons for more info, they're extremely well done

[@mdtransmissionspecialties]

To be 1 of 30 you’d think they’d make sure it’d Atleast run. Great video as always!

[@RagingShrimp67]

More like 30 thousands.

[@PoliticalDissident]

For the really lucky, there’s only 1 of 3 that work out of the crate.

[@Dymitr_Nawrocki]

Yeah, like i understand that they don't want to tune every single engine to run perfectly, I even understand that there might be some minor leaks but that missing nut on rocker arm is just so obvious mistake and selling it like that is just disrespect to customer.

[@thetruth5232]

@@Dymitr_Nawrocki Welcome to China.

[@kleetus92]

@@thetruth5232 kzbin.info/www/bejne/g4XapJiAr8mgedk Pretty much covers it.

[@JDevine687]

That's really really cool! I know you'll get it sorted out. But I'd be really upset if I spent that much on something and it had those issues right from the get go. Like that rocker jam nut... where'd it go?!

[@MarcStollmeyer]

Can you perform a compression check and leakdown? Would be interesting to see if you can give it a boost. 78cc is getting into go-kart territory.

[@firionrazar3797]

I thought of a scooter or some sort of motorcycle :P

[@firefly2472]

my Derbi gpr 50 is 50cc and runs 80 km/h easy. so some boost would go well ; P

[@lucasvanhamburg4937]

your moped is a single cylinder twostroke, I doubt this v8 will ever make as much power.

[@HvV8446]

​​@@lucasvanhamburg4937 description says 3.8kW, i had a 4s 50cc moped which reached about 60 kmh on a good day with 2.2kW. Derbi 2s is 6.5kW. So it might be unpractical, but possible. You'd probably have the only v8 moped in the world.

[@lucasvanhamburg4937]

@@HvV8446 wow I didnt know it made 3.8kw, thats totally a usable powerplant for a moped. I think whatever Q90 does with his engine it will be very interesting!

[@Curtlf]

Just advancing the cap does not change timing but can induce spark scatter. The position of the hall effect sensor that burnt out in relation to crankshaft is what controls timing. kzbin.info/www/bejne/sKHGq2qJmr52orM You could also use an adjustable electronic spark advance module.

[@Frietpan]

i have this moped that is speed limited by a hall effect sensor cutting spark , its a 4 stroke single cyl, would a module like that be able to fool the cdi?

[@corporalclegg914]

I can’t imagine how challenging it is to work on this engine’s performance. good luck JQ90. please do not put in too much valuable time trying to get it perfect…it may become a lifelong battle.

[@Triodes]

What you need is a programmable CDI. That way you are in control of all the ignition timings. Program yourself a nice RPM to Advance curve

[@floriandaler5327]

This engine would be a cool demonstration system to use a board with the speeduino firmware to better control the ignition, and maybe even add (single point) electronic fuel injection

[@42Goopy42]

I'm glad you show the shortcomings with these engine kits. Quality on them has a way to go.

[@WAFFLEZTHATZSOLO]

This things going to look sick in a few months with a custom JohnnyQ90 roots supercharger running nitro methane and water injection.

[@GuidoRotela]

hey! good video. At minute 3:07 you can see the fourth cylinder that loses spark, it has a leak. Also when the accelerator does not respond, you have to adjust the screw on the side of the carburetor until it improves, that is the mixture. lucky!

[@dou8letap82]

Dope! But mannnn... . 3,000$ and the rocker arm was missing a nut?!!? I hope you didn't have to pay for this engine!

[@TheManLab7]

I was just about to say the same thing. Or at least get a few hundred off due too their incompetence and lack of QC.

[@spaghettilocomotive]

He never pays for any of these, they get shipped to him free of charge (or even with a fat check) to be featured on his channel in hopes of luring suckers to buy them. This whole channel has become a chinese commercial channel.

[@sebastian.salmhofer]

That engine would be a great fit for a lawnmower haha. Best sounding lawnmower ever

[@itself227]

I'd be interested in watching you improve this thing. Seems people have issues with the quality of theirs and it would be cool to see one that had been worked over

[@rcOhio]

Looking forward to seeing the JQ90 improvements!

[@RandomBogey]

That thing is awesome. Glad the missing nut at 4:03 is missing-missing and wasn’t just floating around

[@xristoskoutsos9270]

i can see the single 16mm bike carburator coming soon!!! and a question why not make an electric supercharger? brushless with esc etc?

[@TheManLab7]

I'd be PISSED if that was mine. It just goes to show that QC is non existent these's day's 🤦🏻‍♂️ Who in their right mind would think "that's ready to go" when there's CRUCIAL parts missing which could of grenaded the engine!? It's ALSO leaking, with burnt out BRAND NEW parts AND it doesn't even run ??? How can you miss part's when there's ONLY 35 in total and was there a BOM? You need to strip it down to the bare block, check all the tolerances and make sure EVERYTHING'S there in the BOM. Going back to the dizzy (distributor). Your more than capable of making a new one that's adjustable with slots.

[@edwinrussell153]

You should definitely check out Dennis Dempsey's videos on tuning this

[@AnonySpaceHD]

I don't know if its intended, but this videos are the best ASMR for me. Makes me relax a lot.

[@13panda13]

Weirdo

[@roanoconnor98]

Another perfect video for 2am in the morning. I love this channel ❤️

[@nathan584]

Not sure if you followed the development of this motor but I can almost guarantee if you run it on gas with a 2 stroke premix it will run great it was specifically designed and developed with gas in mind. mine runs perfect unfortunately I did have the same loose rockers and hall sensor issues but other than that it's a fantastic engine

[@MinnesnowdanSniper]

my old man had a see-through v8 when he was a kid. Sure enjoyed this video.

[@bencapobianco2045]

I can’t wait to see all the improvements you make to this with your machinist skills!!! Turbos????

[@Matthewbarnes23]

This video is great I have an idea u should try making an actual clutch just small for the engines size and connecting it to the transmission u built and Dyno testing it once u get the correct fixings of the engine

[@johnkilo3]

Do you get these engines for free from Sterling Kit in exchange for these videos? I feel like you make a lot of what are essentially commercials for them. I miss the videos where you would modify them or make custom stuff.

[@scottdoleac5651]

Johnny I would love to see your full engine collection

[@microbuilder]

It would probably be less powerful than stock, but man I'd love to see one of these things in a Primal Raminator (with a blower!)

[@dylansarna8750]

Was thinking the same thing. A real V8 in one would be awesome

[@eriksimca9409]

someone many years ago put a conley V8 in his homemade grave digger, it worked very well

[@gottliebdee263]

Really like this channel. Only thing these tiny V8s are missing is the creamy bassy soundtrack of their bigger brothers.

[@dennisdempseyradiooutofcontrol]

Cool video brother! Try opening the high end screws a half turn out I had to do that to mine,

[@johnnyq90]

Hey Dennis! I tried it, but it didn't solve the problem. Yours sounds fantastic, on point!

[@cubeshelf]

Noticed in the video- may or may not be an issue with ignition, but at around 3:09 if you look at the left-most spark plug you can see the spark plug wires arcing to the side of the block. This loss of electricity can lead to misfiring spark plugs :)

[@douggolde7582]

Turning the distributor cap won't change the timing. You need to turn the distributor body with the points or timing pickup.

[@IngenGarage]

Wassup! Make a NASCAR with a 4 speed gearbox or a tow truck with selectable 4x4 and with high and low range. Just giving ideas!

[@GoPaintman]

Are the spark wires damaged? It looks like there was some arcing between the rearmost cylinder on the left and the bundle of spark wires.

[@avalanche15301]

It's really unfortunate that they build such a beautiful looking mini v8 but don't bother putting the same effort in for the performance and reliability. Hopefully JohnyQ can come up with a couple resolves!

[@SoddingaboutSi]

Moving the cap of the distributer is unlikely to alter timing as the pickup sensor related to the trigger does that.

[@David-p7z9n]

Absolutely beautiful!

[@RedneckSpaceman]

Naturally Aspirated, Twin-Carb V8!! Is the Ignition Electronic or Old-Style Analog?

[@yesterdayschunda1760]

Oh my god, i can't wait to see what you build to put this in

[@keeganlangford5580]

around 3:14 in the video I can see the back left cylinder spark plug wire arcing.

[@tstricklin4808]

Dennis Dempsey has had a couple vids up ,he's got his screaming, can't wait for next video n see what u do with yours

[@JayJay1085]

between 3:05 - 3:15 at the last spark plug lead I think I see spark outside happening. Anyone elese saw it ?

[@WyFoster]

Wish the things came with carburetors that actually worked.

[@Juustomopo]

tune

[@WyFoster]

@juuso hiltunen Won't happen. These things all run like crap because they just come with carbs to make it idle and rev up a tiny bit. Useless for anything else.

[@terracethornhill]

Those carbs should have a main circuit mixture adjustment screw in the center of the throttle slide. It may be covered by a push-in cap. Some versions of that carb are easy to adjust, some are made idiot proof.

[@NBC_NCO]

That little thing is an absolute work of art. I'm curious if you could put something like that on a Dino and see how much horsepower it makes.

[@ThePower1037]

wow, missing a rocker arm nut, impressive

[@Sizukun1]

So glad JohnnyQ shows us these oddities, I doubt most of us would ever know these things exist since we're probably not willing to spend thousands of dollars on these engines that have no real application.

[@jeremiahjorenby2275]

my 30cc 4 stroke weedeater uses one of those carbs, you might try some bigger carbs or drilling the jets in the ones it came with

[@Symbosis1]

Potential for more power, some oldschool tuning and a supercharger?

[@BornIIfly]

Hi great vid, wish you future success excited to see your creation. Have you tried NOS on these motors? Have fun & take care

[@Kubafalkowski97]

Needs a cabin, wheels and some nice spoiler Lit engine! Starts to sound good too

[@SRFirefox]

Sounds like the perfect candidate for a speeduino ECU to control spark.

[@Leroys_Stuff]

Cool motor at that size accelerator pumps might be helpful

[@danielburgess7785]

I foresee much refinement and tinkering in the future.

[@danielhunziker3577]

I'm sorry dude 😮‍💨 These Chinese engines are all so terribly built. It's a pain every time to watch how bad these run. Even if the manufacturers send them to you for free "to get a positive feedback", please don't support that and don't promote such bad products. Believe me, there is nothing more to save! I have been building model engines myself for a long time and it hurts my heart when I see something like this 😭 Best regards from Switzerland!

[@seebarry4068]

Tbf you Swiss get a better standard of engineering. It’s like that time I bought a Ducati and ruined all other motorcycles for myself. Don’t be me.

[@borivojetravica569]

What brand you recommend? Does have reasonable price?

[@danielhunziker3577]

@@borivojetravica569 Good question! At the moment I would recommend KPL 632 V8 engine by KPL Perfomance. This engine ist just out of space! The pricing for a new engine is 12'500 US$. Another alternative would be a Jerry Howell's V8 or Gary Conley's V8 on the used market. These are all high-quality motors and when you are lucky you can find one under for a fair price. And no, my homemade V8 isn't for sale 😅

[@borivojetravica569]

@@danielhunziker3577 one more😁...I am preferred truck 6x6, 8x8 1:4-1:16....way we don't have diesel engine on the market? Is easy to build, longer life...

[@danielhunziker3577]

@@borivojetravica569 Very good question! Diesel model engines used to be very popular in the 70s. However, they were difficult to handle and it felt like it took hours to get them running. Diesel model engines were then replaced by glow igniters with methanol. These were much better to handle and easier to start. That was at the beginning of the 80s. What you mean are classic diesel engines with direct injection. The manufacturability of such small engines is probably not given here.

[@sharkmusic9636]

Very cool project, keen on the new video ! :)

[@Chris-gr8xm]

Hey, man, been a fan for a long time, love you're creativity. How come you haven't gotten into stroking them out, maybe some cams, you make about every other part, and remarkably, as well. Have a good one,man

[@realblakrawb]

Whats the spark timing set at? Throttle response seems like a temp, carb, timing combo.

[@marcustrue1213]

Your really good at working on these mini v8 s thanks for sharing god bless

[@pk-so1mj]

Cam timing seems regarded. Might be one tooth out on the crank which would explain the sluggishness and distributor not having enough travel to get the ignition timing right.

[@randomsandwichian]

Curiously, I came across a video about toroidal piston engines, immediately thought you might be interested. Maybe test one out in the future?

[@btrswt35]

That would look great in a remote controlled, car, truck, boat, etc!

[@Scuba_Bro]

He’s slowly moving up to building himself an actual daily driver car 😂

[@jonathankelly1604]

You do a real good job. I would like to see them in a Chevrolet or a GMC short-bed truck. Man I bet that would be sweet . 🤗

[@jacobrivera7215]

A big turbo made by you on it, that thing would sound sick👍

[@frankierzucekjr]

Oh man, this is freakin awesome. While you wait build a supercharger lolol. Hahaha. Or turbo, I know you can. This has so much potential, but having to change oil often kinda stinks. I'd look in the engine for that nut too lol. Jk I'm sure you've already taken that bad boy apart a few times. I can only imagine the size RC car you can build for this. Sooo cool

[@jclowe735]

Johnny what do you plan on putting this beast into or using it for?

[@boredom.victim]

there's another KZbinr who has one of those engines and he's got his ripping - I can't think of his name but he's a hefty guy with gray hair and stubble, his videos might help - looks like an awesome little engine and I hope it treats you well.

[@craysentippets3123]

You should try the supercharger mod on it just like you tried to do with the other v8 model. Keep up the work love the content!

[@AkiragamingA1]

It would be cool if you could put one of those in a rc car body and drive it around no?

[@antoinefuster2526]

Qu’elle petite merveille et en plus elle marche bravo bravo félicitations peut-on en acheter cela m’intéresserais merci

[@duckjay413]

I also bought this machine there is no problem so far it's amazing you should adjust the carburetor it comes out of the factory it's not the best I noticed the igniter you use 4s battery power it's voltage is over the rated voltage of the igniter so it doesn't work properly that's something to be aware of

[@solunasunrise]

fuel is also used for cooling or what is that return line for ?

[@BMWMPERFOMANCE]

Did your order it like this or built it?

[@_Mav]

Soon we will be seeing you build a 1:1 scale 👌

[@jamesbronson8713]

Impressive looking ! ; I hope it ends up running as good as it looks ✨✨

[@rncboy2]

If one could figure up equal length headers I'm sure it would help out on the carb sink as well and would get better throttle response. Just a thought

[@yungpepster]

Can you make a kit like 4 times this size. Like a 312 cc 4 stroke. And a supercharger, for a quad application

[@NOTTApro142]

It sounds like it running way too rich. But also maybe the lighter fluid is making it a little haywire. But with some carb tweaking it’ll get better I’m sure of it

[@joetuktyyuktuk8635]

Who else likes it better when Johnny made his own stuff?

[@ZezimaMills]

Will it drive a go-cart? That would be so sweet!

[@ETKSauron]

for nearly 3000 US dollars, I'd be super pissed at how that thing runs/the quality control issues. I'd be sending it straight back and asking for a new one and/or a refund.

[@TM-88]

Keep these contents coming!

[@tsar-bomba2413]

Dual turbos with titanium intake and exhaust... Now that would be sick

[@caleblevasseur2657]

I would open up the intake ports under the carbs, machine new cams maybe ones that’ll give it some chop and maybe som forced induction

[@TheHandyAndy]

I love these videos. I wanted to ask if anyone has seen a diesel inline motor in this size?

[@KTDrones]

Where did you buy this from??

[@jonnybamber1772]

If this thing gets running right at 78cc think you need to make the first super charged v8 moped!!!!!!! Might not be the fastest but would be a world first and totally awesome!!!!!!!!😍😍😍😍😍😍😍

[@alexsaam2696]

It actually has a small starter. Thats awesome

[@user-lx9jm1wo3h]

Does it actually have little spark plugs or are they glow plugs like nitro motors?

[@rickkubbenga5904]

Will you do more with this engine?

[@joesshop3622]

I'd like to see the test with the fuel located above the carb.

[@kainagami]

Yeah That engine is gonna need to have some work and tuning to do

[@angrytwizzlers4039]

When youve got carbs and no crossover for heat (im assuming it has none) you may need to put some heat in the carb to get any performance.

[@fir3w4lk3r]

They should come up with a ~60 cc 4 in-line but with MPI EFI, speeduino controlled.

[@douchedidit9222]

U should rig up a clutch and put it on a scooter a kick scooter that would be kinda cool or a pedal cart would be dope

[@joshlewis5065]

Lash the valves if you have not already. The valves are seating so you need to adjust for that else you'll have no compression

[@clutchkikn.]

Oh wow! That's a work of art!