We Make 15lbs Of Boost!!! Supercharged 440cc Take 2

Today we take another crack at our supercharged 440cc Duromax project. On the last episode we tried doing this with the factory propane carb and failed. Today we remove the governer, install some 50lbs valve springs, and put on a 34mm Mikuni carb from go power sports. We ended up making 15lbs of boost so its time to fully tune out this engine. Stay tuned for the install of this engine on a go kart!!!
Parts Used On This Build -
AMR300 Supercharger - amzn.to/3WKle7f
50lbs Valve Springs - bit.ly/3cYYj0x
Duromax 439cc Dual Fuel - bit.ly/3BQVKuR
Performance Jet & Air Filter - bit.ly/3O12rQ0
34mm Mikuni Kit - bit.ly/2PeTnL1
Mikuni Adapter (used on supercharger) - bit.ly/38VQ3Li
Mikuni Adapter - bit.ly/3BMRNYv
Build Your Own Header Kit - bit.ly/2NDPdM9
Billet Flywheel - bit.ly/2VR3lEw
Billet Rod - bit.ly/2IOKQue
Merch & Events - bit.ly/33YbmtO
Check Out Go Power Sports for all your Go kart needs! bit.ly/2viX9vP
Parts & Tools used on the channel - amazon.com/shop/redbeardsgarage
Quantum Machinery- Siegmund Welding Table - bit.ly/36PHm6G
- Nargesa CC60 Bender - bit.ly/2xWDVxj
Prime Weld Tig 225x - amzn.to/3L4U3MG
Prime Weld MIG180- amzn.to/3KVUPvn
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*********Disclaimer*********
Please do not try to re-enact or recreate anything you see in these videos. We are trained professionals. Red Beards Garage does not take any responsibility for injury's created by doing so.
#RBGKarts #RedBeardsGarage

[@kylek5446]

My son and I got the 440 duromax engine last year. Been trying to figure out how far to go with it. I don't think we'll go this far. This will be our first build, and your videos have provided a lot of info and entertainment. God bless you and your family

[@kylesyx8432]

I got massive power gain, without going crazy, on my 200 cc clone “stock block,crank,cam no governor of coarse I port &polished head . Note: match your intake (inside dimension) to the size of your intake “Valve “ for max flow ! A 400cc you may have to buy two carbs but my 212 uses 22lb springs w 1.3 ratio rockers stock push rods work fine for this build ! VM 22 carb on max setting ( turned wide open ) And headers I know I’ve doubled my power easily! I think you will be satisfied w the increased power

[@thedude7726]

Valve springs or ratio rockers make a big difference for cheap

[@cedhome7945]

With all the engine parts and tuneing vids out there it's time to start a mini bike drag race series 212-225 cc first class 420-460 second class and turbo /super charger unlimited class it going to be affordable and will bring more people into building these engines and have fun racing.great to see you make this 440 tune👍

[@user-cb2rq8iy9x]

212-263 there's some crazy 212 builds up to 225 sells it short some of them can compete with 420's depending on the build most likely high octane builds.

[@philipmail499]

Finally supercharged another engine.

[@sammmmu6280]

Let’s see it on the dyno!

[@Just-InTimeRepairs]

This is a badass build man. I'm looking forward to the next video.

[@PaulThomas-qo9vy]

Whew! That made my few hairs stand up on my head when that big block rev'ed hard with boost ! I wished you had run that propane carb as a draw-thru. I believe your results would have been a more positive result. Hope for future propane boosted small engines. God Bless ya'll !

[@josephwantz4035]

I can't wait to see this thing on a project

[@MrBilldo426]

I am so trying this in either a go cart or a grom swap. Right up my alley. I might even swap it into a power chair the possibilities for awesomeness are staggering. Thanks for posting the links brother.👍 I’ve never thought of this setup before but it has potential to be amazing 😊😁👍👍

[@irunwithtexas]

A beasts I love your channel and I’m loving what these engines come from to now 💪🏾

[@anthony2cassidy282]

You said your carb doesn't like mid speeds. Move carb away from the charger some and build like a surg box between the carb and charger. I'm thinking every time a lob goes by the opening it has a break pressure change. Keep up the work. Love watching you guys.

[@1tom35]

I learn a lot watching your videos!

[@the_car_guy5915]

Sounds like one HELL of a little runner dude. Can't wait to see it on a kart or something.

[@nikdipetta]

Yes more road to horsepower videos!!

[@MBTR2022]

It will produce less boost under load. Free rev at 15 psi depending on gearing could get it down to 5-7psi

[@zanderx7]

Rlly ? I figured the opposite

[@braziliansheetbox2497]

Don't think that how it works in a draw trought setup

[@prodzektownia]

@@zanderx7 in turbo aplication yes, in supercharger no, i build couple years ago a GY6 150cc with supercharger, on free rev it was pushing over 28PSI, under load it was like 14PSI

[@zanderx7]

@@prodzektownia oh okay. That’d make sense as I’m much more familiar with turbos lol

[@user-vh7ki7xu7o]

@@prodzektownia watched your first start video, dope 👍

[@rong4189]

Just make a tool that bolts to the rocker stud to remove the retainers, no need to remove the head. (make it out of an old rocker 👍)

[@KACSR15E3]

damn, I just commented the same thing! I guess I should go through the comments before I open my big mouth! lol..

[@royb.1441]

Sweet!! Grease or oil those gaskets. It helps them come off without ripping and they seal better I think. Just don’t it to the head gasket obviously lol.

[@igokarts4510]

I've thought of something similar. Making a top plate with 5/8" pillow blocks on top of it. (Essentially a jackshaft with v-pulleys) And fab a bracket for the supercharger to get it closer to the intake port. I wonder if a Tilly carb would work or maybe a Dellorto or a single Webber

[@user-qp5fx3xn4w]

this series is INSANEEEEEEE i love it and im going to try and copy your setup to an extent how much has it run you so far? also when will the next vid on this thing drop?

[@earnestmatlock9694]

Many years ago I had a vw, and it used a direct downdraft carb. Single butterfly throttle and usually an electric choke. That may work but the carb is vertical position only. That would boost CFM quite a bit as the be is a weak 4 cylinder engine. You would have to play with it to get it to work. You may have to use the throttle linkage to control boost levels too.

[@fabio77809]

Congratulations great job

[@str8upkickyaindanuts289]

The intake pipe temperature will have an erroneous reading using a IR temp gun due to emissivity of shiny metallic objects, to get a more accurate reading you can apply a black sticker or paint onto it.

[@commentpulling]

I’m not sure the model but you might look into a S&S carb. Can’t wait to see this go on to something!!👍🏻

[@anythingmotorized6157]

next time doing valve springs get a pressure regulator and line with same threads as spark plug and run about 10-25 psi into the cyl should keep the valves up against the head and make the swap more efficient

[@builtonabudget6160]

I can't wait to see another video I wanna put on on my 250

[@edgualdino628]

Keep them coming ❤

[@corneliussianturi476]

about this engine that using supercharger my advice, Static Compressio Ratio, down to 7:1 boost to 0.8 BAR make sure to recalibrate ring piston gap compression 1 and 2 for below 1 bar and make sure, camshaft duration are not to wide, cause turbo / supercharger hate really wide camshaft duration and high overlap profile hope it's help

[@robertweeks2039]

It would be nice to see your tuned version of this super charged engine on your dyno to see what improvements you achieved.Very interesting build.

[@kylesyx8432]

I ran duel webbers in my Baja & it took a beating,!! you can drown um in water & dust um w dirt ! If my engine stalled I just Spray um out Pull the plug ,,turn over a couple times Put the plugs back in and 💥 I’m running again!! 💥

[@LoveconQuersall73]

❤ BLESSINGS TO YOU TOO . VERY HELPFUL VIDEO

[@jessecochran8017]

I wish you could do a draw through propane setup now… it’s the reason I ended up here

[@6speedguy845]

Your channel does have interesting things on it

[@rachalhollier5679]

On my naturally aspirated Honda gx240, yep 240,lol. I shaved the head to gain compression (a lot),& added some 26lb ducar valve springs to the new factory gx390 valve springs and well ported cylinder head then job welded the back side of the intake valve area to get rid of that void that’s there. Using a pz27 carburetor and chinesium adapter 😂 with an exhaust pipe that matches the 28mm exhaust port. Wow, I have a screamer, the only thing is I need a set of ratio rockers to go with the improved (better lift) gx390 camshaft. It runs great too

[@jamest.5001]

It needs a bypass, even a 1/2" ball valve will work to to bring the output to the input of the supercharger toto reduce boost at idle , then close when the throttle is opened, possibly open again to regulate boost slightly, maybe 1/2" tubing and call val it doesn't have to be open all the way, maybe 1/4- 1/2 way open at idle, then close as the throttle opens, and possibly open at full throttle to regulate boost or while cruising not needing full power! A small carburator throttle valve would work great for this, maybe a weed eater carb with a hose barb fitting nade to fit and seal both sides. Only Using the valve. And sealing the fuel lines. Then a Arduino and servo can with throttle pedal sensors to regulate the bypass, with no throttle while going fast down a hill it will be better to have the bypass fully open! It will make it much easier to drive! Imagine a supercharger from a 3800 Pontiac or Buick on a v-twin, (*they have bypass valves also*) it would require a gear reduction to keeping the heads on the engine, it would probably make all the boost at idle, then throttle and boom, it would be about 3000 cc too large but a 4:1-5:1 reduction should work , but one of these would be plenty for a v-twin! Imagine one on a micro truck ppl are importing, slightly modify the engine, polish the chamber and pistons, port the heads, add a supercharger, maybe two,(three running 2 into 1 to make a compound setup, but a turbo and supercharger would be cheaper, with the supercharger working near idle, the turbo afterwards, make 25 psi, easily doubling the HP, a micro truck making 50-100 hp😮

[@jamesweideman4834]

First of all, you are an inspiration. I love your channel. I have a 440cc duromax that I put on my Chinese go kart. I was looking thru the parts below and was wondering if you used a stock cam or if you used an aftermarket one. Thanks for the entertainment. Have a blessed day.

[@4077661466jp]

Wow id imagine your running forged rod/piston with conservative cr ? Which not sure what these engines have stock, but this would be cool even on a small block setup like 8-9hp ghost motor, cool stuff man 😎

[@glenwhitacre2754]

I have found that all the Chinese polaris carburetors have the needle seat with no hold down clip and out of spec, you can drive it down to the right fit to stop it from flooding. I've done it to all of the Chinese carbs and had good outcome. Good luck

[@motoman22atgmail]

Consider a Mikuni Super BN. It was used in Kawasaki and Yamaha PWCs back when they were twin 2-strokes. They have no float, kind of a cool setup.

[@minibikemadman]

needs more main jet if your jacking that much boost. Very cool setup nice to be shown it can be done good...ya got me thinking.

[@boosted.]

I use a 48 mm Mikuni Flat slide carb on my draw through Garrett Turbo charged 131” TP big twin, it’s been years and other than some mods to the needle and seat to run a fuel pump and getting it jetted right it works Flawlessly, maybe it’s different with a roots style blower? 200 foot pounds 210 Hp to the tire on E85 built 2016 refreshed 2021.

[@jameshooks7452]

I think you need to build a drag cart and race cars and cameras. I would buy a ticket to see that sowdown. Thanks.

[@brian6029]

Man, wish that was on the dyno.

[@suzukiman650]

Came here to suggest a Beetle carb but I see several people have mentioned this already. Easy to get a new one from several places online and not that expensive.

[@iainhunter9481]

You can change the valve springs without removing the head as it’s done loads of times on cars, piston to BDC and connect your shop air supply into your plug socket, trapped air pressure in the cylinder keeps the valves shut

[@jimm7165]

You can't get a good reading with an IR temp gauge on polished aluminum. Just give a spot on that tube a spray with flat black paint. That will give a better reading.

[@spankthemonkey3437]

@Red Beard's Garage get a two barrel Holly carb to mount up to supercharger. You might have to make a special little manifold to make it work but dam the air and fuel you could shove in this motor then😁

[@FangOfTruth]

4 cylinder Pintos used a 34/38mm DGAS(?) ( I think I remember right) Weber style carb. It is a primary/secondary style. People used some on Volkswagen Beetles. But the factory VW ones are probably smaller and work better in this ins.

[@Ratkill9000]

I do have a couple Solex carbs for a VW air cooled. Might be 28mm will have to check.

[@Abrasivecactus]

Man I hate google/KZbin from taking y’all away from me so long ago. Nice to see y’all again

[@TheTrooper777]

Awesome 👌

[@terryj257]

I think you should take a look at a carburetor for a Suzuki quadrunner like an older one I worked on one a few years back and they have both a butterfly and a slide I'm pretty sure the slide was ran by vacuum. So the slide won't stick from vacuum from the blower. I can't tell you the millimeters for sure but if I had to guess I'd say about 36mm. The one I worked on was off of a lt185cc.

[@lawrencefranck9417]

You need to build a tool to remove the valve spring without having to take the head off. With a duel cable throttle one could control a butterfly valve.

[@alexlacroix9515]

Mikuni super BN they do make a 34 mm but the 38 mm flows closer to TM 34. Bullfrog makes billet adapters and velocity stacks for BN carbs.

[@9thGenerationCajun]

Alright you have me wondering how well a surface drive setup would work on the water. Dig your channel man 🔥

[@steveskouson9620]

The carb on my Yamaha Warrior, has a flat slide, and downstream from that, a butterfly. Don't ask me why. Got the quad from my old boss, needed a battery, carb, fuel petcock, and a front brake master. Quad cost me $200. Have no idea why the carb has both the flat slide, AND a butterfly. No, the butterfly is not the choke. It's on the other side of the slide. Doesn't have a "choke." Has an enrichment circuit instead. (Replacement was $40, on the Jungle site.) steve

[@jaredbudzinski8434]

Are you concerned with the added spark timing when you switch to the billet flywheel?

[@kriskersey9927]

In the early 2000s, HD shops were selling tons of Screaming Eagle performance parts to new bike buyers. If you check around with old Mom & Pop HD shops they should have some for sale.. I wouldn't think very expensive by now.. That should work for you..

[@garyfraser8584]

Very cool

[@dogprowilhelm7630]

Great part 2. That supercharged engine has enough room for intercooling. Keep the boost high and intercool. Can the intercooler be chilled will the liquid propane and preheat the propane fuel at the same time?

[@jameswade2002]

Awesome setup once it gets built, and I'm so excited! 15psi is definitely the danger zone. One question I'm wondering about is how a 300cc supercharger manages to double atmospheric pressure (14.7 nominal + 15psi = 29.7psi actual) with a 1:1 ratio on a 440cc engine. I'm thinking that you have to already be underdriven somewhat. I'm all about that party pulley life so I say build the snot out of it and be sure to super size that ring gap and add head studs and a copper gasket to the usual billet parts and run it on 110 gas with a bunch of extra timing and a cold plug. What about a giant Tillotson carb? Put it on a mini drag bike!

[@dannybourke87]

Its a 4 stroke so in 2 revolutions of the crank it will draw its displacement

[@MyLonewolf25]

Pressure is just a measure of restriction. It’s not 100% efficient.

[@Parents_of_Twins]

I agree it does seem high and that air going in is going to be HOT. I'm surprised at 15psi that he wasn't getting detonation.

[@K_M_M_G]

Friendly heads up laser thermometers do not work on polished or reflective materials. Typically the emissivity needs to be around .99 (nearly black). A thought is to add a piece of black duct tape on the intake for laser to monitor readings

[@steveskouson9620]

My pressure canner now has black tape on it,so I can get temps. steve

[@racerboygtr1]

would like to see a fuel injected small engine using like a low end holley or haltech fuel injection setup on a v-twin setup along with boost. in my opinion it would probly make decent power, have the low end drivability, a long with data logging built in.

[@alexanderdesfosses]

The microsquirt ecu was built for that

[@clintonvaught9835]

Wouldn’t having a fan blow on the engine to simulate air flow while driving assist in getting a better reading?

[@larsjrgensen5975]

The IR temperature gun does not work on shiny surfaces like the intake pipe, put a piece of black tape or something on the surface you meassure. It also is not accurate at measuring the exhaust temp from 1 meter away, the measuring area is mostly shown on the gun, the exhaust can be 700 F and the air around it 100 F, the gun will average those temperatures and show the 400 F.

[@jeeper426]

go to an auto parts store and look for a carb for a 1984 jeep cherokee with a 2.5L inline 4, it might be a /tad/ too big, but you can make that crappy solex carb work with anything, its a butterfly style carb with an electric choke (easily convertable to cable choke with a little work) but should provide plenty of flow into the supercharger, and plenty of fuel for the engine, it is a Down Draft Carb however, if you are looking for a side draft, Webber Redline, or a holly BugSpray might work for the application with some modification

[@johnebke8411]

I blow through turbocharged a 454 on propane. It worked great. You could do it with this too

[@rachalhollier5679]

Use a wide band to jet the carburetor.

[@KevinRadford-st9mb]

Love video but don't see very many people doing it

[@rong4189]

Compressed air does get hot lol!

[@Nathan_Bar182]

Dang that made 150 horsepower

[@jdjd0711]

Hey you need a boost relief valve. It looks like your boost spices were when you closed the throttle and the boost has no where to go. Not at wide open throttle. This is normal for boosted engines. Lol and water systems. If you close a water valve at the long end of a water line from full flow to closed to quickly it can knock the valve off by the surge of water. I think that's what you are seeing here. So try that before swapping pulleys. Easy to test to. Put on your dyno and run it at rpm without closing the throttle and see what boost is recorded thru the rpm range

[@fololoco6420]

Most definitely gonna produce less boost under pressure, but you would still make a enough for a minibike

[@parkerhorton3471]

I plan on something very similar for a golf cart

[@matt-be8kt]

Make sure to open up your ring gap or your going to have issues, and I would go at least one step colder spark plug, and close up the gap on your plug a few thousands as well. Do you have any access to ras gas 100+?

[@davidthehillbilly7995]

Beetle carbs are downdrafts and come in 3 sizes. 30, 32, and 34mm for the 1200, 1500, and 1600 engines that put out 40, 53, and 60HP respectively. Add PICT after the size you want and happy hunting....

[@davidthehillbilly7995]

Oh, if you're thinking about a 1200cc sized carb, how about one from a Datsun 1200? It's a staged 2 barrel with a 26mm primary and a 30mm secondary. Knock offs are around....

[@brianbruton2897]

The only reason you need a carb for LPG (propane) is for the butterfly of the carbs I used to use a blow through on a Rochester carb on 305 chev

[@brokejoebuilds5165]

The motor will not make any high rpm power because of the intake runner length. The engine will run out of steam pretty quick. If you make that intake runner shorter by moving the supercharger closer the whole combination will benefit greatly. Good luck with the build.

[@brokejoebuilds5165]

@@bradensmith888 regardless of cylinder count, the simplest explanation..... the distance from the intake valve to the throttle opening determines the rpm range in which a engine will run. The further away the throttle opening the lower the rpm the intake would be tuned for. The shorter the runner the higher the rpms. Hence when I.R. manifolds are made the length of the runner needs to be considered to make sure the engine will make the power at the desired rpm. By switching from blowthrough to drawthrough the way they did they effectively went from a short runner to a super long runner. Remember the throotle opening is a metered vacuum leak and the runner begins and ends (for the most part) at the throotle blade.. there is a effect after that but that would be negated by boost in this application.

[@prodzektownia]

You need a plenum between head and the blower, 4x size of the engine CCM

[@chriszavitz6407]

Drill the slide on a mikuni and drill the lid and pressurize it with your boost

[@loissteger3888]

Boat motor carbs should work they are butterflies and get fairly big too. Mike

[@marcustrue1213]

Update I have a predator hemi max performance 459 cc and I bought the exact same AMR 300 ter supercharger my plan is to run somewhere in the neighborhood of 6 to 8 pounds of boost And let me correct myself by saying you need a Recycling bypass valve or at least that’s what I’m going to use you can put a blow off valve but that’s if you’re running higher boost levels mainly also I’m going to add an inner cooler probably copy you and go with the 50 pounds springs port and polish the head head into a stack kind of like Semi exhaust with flappers got to keep that rainwater out and since nobody makes any performance parts for the most part for these engines as far as billet I’m going to a machinist and going To bring him a chunk of billet for a connecting rod piston and a flywheel definitely going to have the caps made with a lot more meat but as far as a carburetor I was thinking something like a small single barrel and modify it Into a blow through carburetor with all the fixings Wideband O2 sensor boost gauge Boost referenced fuel pressure regulator fuel pump and as far as connecting it to the carburetor I’m going to fabricate a box shaped hat(Basically to simulate pressurized atmosphere) Also it’s pretty important where you put your Bypass valve I would just let it dump out into the atmosphere but figured I’d give it a little more to take stress off the supercharger I’m pretty sure with as low of boost I’m going with the stock timing should do just fine maybe throw a different spark plug along with some ARP head bolts and ARP studs for the manifold and exhaust my ultimate plans for the engine is to utilize a four speed manual transmission out of a Chevy Luv as well as the driveline and rear end get a narrow rear end and shorten the driveshaft then I have a craftsman lawnmower I’m going to rob parts off of build a cab trying to be as weight conscious as possible but I have a craftsman trailer as well I was going to use as a truck bed that’s where I’m shooting for anyway still got some kinks to work out and I realize that it’s going to be quite a long road ahead of me but I definitely think I can pull it off then as a sidenote I have a 79 Chevy Luv I’m swapping in a small block 350 with four bolt going to get some aluminum heads a good intake cam board it out possibly turbo I’d like to be in the 400-550hp range a turbo 350 transmission put a little 10 Bolt out of a S-10 but ultimately I have a 14 bolt that I’m going to narrow and use convert the rear suspension from leafspring to a 4 link suspension and ditch the front torsion bars for some coil over springs in the front should be a nice little sleeper and make a dual exhaust with a cut off valve throw a couple mufflers so that way I can trick people into thinking all I have is maybe a V6 at best open up the cutoff and blow their doors off God bless and have a good day man

[@TheBigred1781]

Maybe it needs a relief valve being a positive displacement blower?

[@danielfrazier840]

Use a leak down tool to hold the val es closed

[@UnknownProductions0]

E85 dont worry about intake temps.

[@travisjohnson6358]

Nice id like to do something with a old briggs and stratton 5hp flathead

[@banditgrizzy1955]

🤔 I'm curious about the predator 22 horse. Would you add a turbo n blowoff valve with a fuel tech system , cam, and all the goodies to see how much boost and power increase? And use E85. Also.. is it safe to add 6oz. Duralube and full synthetic oil 10/40 on any small motors?🤔

[@silleywilley]

I really need you to say “propane and propane accessories”

[@boostedeghb]

Hey man, did you decide if you guys are going to Windrock Saturday or Sunday? My phone says Sunday is supposed to rain. We too are about an hour and a half away. My buddy, my ol lady and I have been talking about going for a while but haven't made it out there yet. We mostly have rode out in paint creek in the smoky mountains this year. We are gonna head there tomorrow though. Would be awesome to see you guys out there. Maybe do some riding together.

[@keydougherty5813]

Would love to see a road to hp video on the big block. And dyno video on this engine. Could this engine be competitive in uas racing?

[@danteverna4261]

I seriously hope this build ends up on the dyno at some point

[@pawpawdiablo313]

If you mount supercharger really close to engine will get rid of alot of lag great video currently taking 94 Honda 750 magna v4 going street ripper with CBR suspension and about to try BOOST myself lol

[@prodzektownia]

what the fuck are You talking about, what lag? on a supercharger? the closer the supercharger is to intake port in one cylinder engine the worst is the power output, one cylinder engine need plenum 4x size of the engine, so if it is 440cc it need plenum ~2000cc so the boost can build up

[@proximap2151]

Throttle body and efi would work.

[@SnowRocker88]

Consider running an External Wastegate to control boost? Could bleed from right behind the sc to just behind the carb?

[@kidkhaos6427]

old school phazer has 34mm butterfly style mikuni.

[@arnielinback1666]

Titanium nitrate would be I think would be a good coating for a small engine it supposed to reduce friction

[@MilesMcFadin]

Would like to have seen the factory propane carb in the intake side of that supercharger with propane

[@arthurwellington7635]

I race there 60cc karts and the carb fits a tiliston with an adapter and will fit the predators too

[@masonzimmerman1047]

Old honda 2wd race quads and the bigger cc came with butterfly/accel pump keihn carbs

[@kainthepain7126]

Very kool

[@zangzang1268]

I don't think you will run into carburetor slide problems with them hanging - atmospheric pressure is a constant and they can handle that just fine on deceleration from high RPM.

[@ronaldalleman2111]

Cool