RHB31 VZ21 Turbo – Amazon Affiliate link: https://amzn.to/3mMWAAu
If you would like to get a turbo of your own as well as helping our channel, use the link above!
Time to Turbo a Rotary! We have been wanting to give turbos a second shot and figured that the rotary minibike would be a pretty good candidate. We removed the stock sachs KM48 carburetor and started to put together our draw through turbo system with a VZ21 turbo. We found a pretty easy solution to oiling the turbo by using a GoPowerSports pulse pump as an oil feed pump.
Thank y’all for watching, stay safe, and be sure to stay tuned for the next episode!
MERCH
MERCHANDISE CUSTOM DESIGNED BY YOURS TRULY
https://teespring.com/stores/build-break-repeat
TOOLS
RogueFab Tubing Notcher
https://www.roguefab.com/product/versanotcher-universal-tubing-notcher/
Pro-tools Tubing Bender
https://pro-tools.com/collections/tube-and-pipe-benders
Optrel Crystal 2.0 Welding Mask
https://usa.optrel.com/en/eye_protection_helmets/products/show/crystal20/
Optrel Grinding Mask
https://usa.optrel.com/en/products/augenschutz/helme-zum-schleifen-schneiden/products/show/clearmaxx/
MUSIC
Music - Background and Montage Music Is From Endemic Sounds
https://www.epidemicsound.com/
Intro Song - Jimmi by Andrew Applepie
https://www.youtube.com/watch?v=l1zHz8pYfyQ&ab_channel=AndrewApplepie
—————PARTS—————
RHB31 VZ21 Turbo – Amazon Affiliate link: https://amzn.to/3mMWAAu
Turbo Flanges - Amazon Affiliate link: https://amzn.to/2ZWbydh
Pulse Pump- https://www.gopowersports.com/round-fuel-pump/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Catch Can - https://www.gopowersports.com/aluminum-catch-tank/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Seat - https://www.gopowersports.com/19-mini-bike-seat-coleman-ct200-replacement/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Chrome Shocks - https://www.gopowersports.com/universal-adjustable-standard-shock-12/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Chrome Wheel - https://www.gopowersports.com/6-astro-wheel-aluminum/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Inner Tubes- https://www.gopowersports.com/410-6-tube-90-degree-valve-stem/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Tires - https://www.gopowersports.com/13-x-500-6-turf-tire-2-pack/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Gold Chain - https://www.gopowersports.com/rk-gold-premium-racing-chain/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Fenders - https://www.gopowersports.com/4-25-wide-mini-bike-raw-steel-fender/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
¾ Lock Collar - https://www.gopowersports.com/jackshaft-lock-collar-3-4/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Brake Band- https://www.gopowersports.com/5-carter-brake-band/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Brake Band Pin- https://www.gopowersports.com/brake-band-pin/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Brake Cable and Lever- https://www.gopowersports.com/mega-mini-bike-brake-kit/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video

Jack Shaft Sprockets - https://www.gopowersports.com/12t-jackshaft-sprocket-5-8-bore/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jack Shaft Lock Collars- https://www.gopowersports.com/jackshaft-lock-collar-5-8/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jack Shaft (10 inch with lock nuts and key) - https://www.gopowersports.com/5-8-threaded-jackshaft/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Grips and Throttle - https://www.gopowersports.com/throttle-twist-grip-7-8/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Clutch - https://www.gopowersports.com/10t-3-4-bore-centrifugal-clutch-41-420/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
RLV Muffler - https://www.gopowersports.com/rlv-4104-1-5-16-exhaust-silencer-with-hd-ss-clamp/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Weld On Tabs - Amazon affiliate link: https://amzn.to/2XOoIIv

Oh, so we got an awesome response on our first three rotary mini bike: videos um - and you know what we're just sitting around listening to this thing, n a and we really do like how it sounds, but i think we'd be definitely missing out. If we had a rotary mini bike and didn't at least try to turbo it, so let's get our turbo over here check this thing out guys. This is a vz21 turbo, basically the smallest one we could buy. We used this thing on our turbo 212, with uh kind of iffy results.

It was tough to turbo predator 212, but hey. It did run and drive with a turbo and made boost and stuff. We should not be encountering any of those same issues when we turbo this rotary. I actually think this thing is going to spool up like crazy um.

So i'm sure you all are excited as we are to get this thing on. So, let's just get started in this video we're gon na be basically just mounting this guy up and seeing how much noise it makes how much spool we get and then in future episodes we'll do all the plumbing and things and drive it so stay tuned for Part one you're gon na hear this thing spool today, so we want to hear this thing one more time in a so we'll give you the guys kind of like a little sound comparison, so we're just taking the chain off, so we can easily rev it out And not have to worry about anything hope y'all like that. Last run. We wanted to do that, but now we got to pull the fuel system.

We actually have to add a permanent mounting system instead of zip ties on here. Once we get, the gas system mounted up, then we'll be able to mount up our turbo we're mounting our gas tank right now. The front uh bars up here are a little narrow, but we got these go powersports gas tank mounts which are super nice and they have these nice beefy brackets down here. So we're just gon na kind of bend them in and cut them to fit our frame.

So we got pretty lucky that the turbo from our 212 uh, the turbine like bearing and the nut and everything, came off - it's basically junk, but we can take all the fittings and all the fabrication for the flanges that we already did and just use it on. This one, so it's pretty lucky, so we pretty much got all we need off of this thing. We have a block off plate for where the water cooler would be. If you opted for that, we have the oil drain and the oil fill.

These are just kind of plates we made from previously, so now we need to do is we need to mount up where our exhaust flange is going to go coming in here to power the turbo - and we have this flange here, so we're going to get it Bolted up and then we can go over to the mini bike and mock it up how we want this thing to sit. Okay, good, super cool. Oh we just got tacked up. It looks really nice but yeah pretty clean, not too much leverage or pipe going from there, so it should be pretty solid, so now we'll just get on the table and weld it up all the way.

Okay, so this is all welded up, looks pretty good. Now we need to focus on an oil system on the last turbo cart, we did. We used like a diesel transfer pump and we had to have a battery on board and everything. It made it a huge pain, but we had a good idea of maybe just using a go power, sports pulse pump and seeing if that would be able to pump oil.
So i'm going to cut to a clip. We took a few weeks ago where we tested that out and let's see if it works, so that worked um, we had a steady stream of flow even at higher revs. It pretty much maintained the same flow, which is perfect. We were worried about over oiling that way, you know, because then it overpowers some of the seals in the turbo.

So with that being said now all we need to do is just do our turbo, inlet and outlet lines from the exhaust and to the intake and oh we'll be hearing this thing, be a turbo rotary, mini bike. We're super lucky we're not gon na have to use a battery or anything for an oil system so, like typically we're just gon na use. This go powersports catch can because they look really nice as our oil reservoir. So how it's going to work is we're going to have our turbo up here with our feed line, going from the pump to the top? It's just going to gravity drain from the bottom of the turbo into here, and then this down here is going to go back and it's going to be our feeder for our pulse pump.

So we have the turbo in and now we're doing kind of our oil wiring. The routing on this is actually really clean. We have just a really uh you'll, probably recognize from a predator, but just a little hose going from the outlet to our catch can and then the outlet of the catch can goes into the inlet for our pulse pump, and then we have the pulse coming. There's a pulse port on the bottom of the rotary, which is actually super convenient, and then we have the out from the pulse pump that will go right up in here to the top of the turbo.

Pretty simple. All the essentials for just the basic system are in uh. What we want to do before we go any further is make sure that everything works. We want to see that the turbo is spoiling.

We want to see the oil is getting pumped and there's no like exhaust leaks or anything like that. So yeah. We just need to fill up with gas and we'll get to hear this thing, spool yeah she does. Hopefully we get consistent oil and stuff yeah.

All right sounded awesome, i wonder hopefully, okay, hmm just wanted to die. Hmm all right. So it's doing the same thing yeah. We got a little bit too much oil coming through.

So that means what we need to do is we need to add some sort of um valve on here, a petcock that goes above the oil right. On top that way, we can kind of restrict some of our oil flow. Pretty cool, though, sounds awesome. Well, the good news is the oil pump works, because we can see all the smoke and oil we're burning and all the oil coming out of our pressure side of the turbo here.

So the problem is it's being pumped in faster than it can drain out of the turbo, so to fix that all we're going to do is add one of these guys in line and what we can do is this is completely closed. This is completely open. So what we'll do is we'll just kind of turn it to. However, we like it, what we'll probably do is we'll run it until it stops coming out of basically both ends when the smoke gets low and then we'll just leave it here forever unless it gets.
Unless we see there's a little too much smoke, we'll kind of turn it down a little bit and vice versa, we probably got ta burn out the old stuff. First, yeah. Okay, that's cut like almost all the way. I wonder if it's dripping in too wait.

Let's see, could it be? Oh you mean it's going into the exhaust and taking it down yeah. I bet it is well, let's i'm gon na close it and we'll run it for a bit. Okay, all right! So right now we're going to test uh. We have the petcock completely closed.

We just want to see like we just need to see what's going on, basically so we're just going to kind of mess with the petcock. While we have it running and kind of see what it's doing. Ah dang it we got. Ta burn out the oil right, so we have just a trickle going through here we're pretty sure that seals on this turbo i mean we did get off ebay.

It is the smallest, cheapest turbo you can get so it's probably just doesn't have very good seals, but we have a very small trickle and our plan is to use two-stroke oil through it because for one it probably doesn't matter too much for this cheap turbo. But then also when, if it goes in and burns, we won't have like extra carbon buildup or anything it'll be oil, that's meant to burn cool all right guys. Thanks for watching uh, we made a lot of progress in this video uh. We, it is very promising.

We think we can get this thing to work so stay tuned for next time when we start doing all the boost piping and the exhaust, and you actually get to see this thing make boost. Thank you for watching. Thank you powersports for a lot of the parts on this build and make sure to subscribe and stay tuned for the next video good.

Avatar photo

By YTB

25 thoughts on “Turbo rotary minibike ep 1 mounting the turbo!”
  1. Avataaar/Circle Created with python_avatars vico see says:

    I would have ported intake and exhaust and tried larger carb

  2. Avataaar/Circle Created with python_avatars RoZe says:

    So I have a 212cc predator engine, where can I get a water cooler for it? I really need help.

  3. Avataaar/Circle Created with python_avatars Robert Marsh says:

    Where can I get my hands on one of those rotary engines??

  4. Avataaar/Circle Created with python_avatars ailokemi92 says:

    Too small drain! Remember that you should have at least 1.5 bar of oil pressure and 3x-4x bigger drain than that one you are using, journal bearing turbo require pressurized oil, not just a feed, you need constant oil pressure, or your going to have a bearing failure

  5. Avataaar/Circle Created with python_avatars kent makin says:

    Hey mate. I have one of these with poor compression and I'm looking for a seal kit for it. Any available that you know of cheers

  6. Avataaar/Circle Created with python_avatars Hunter Cobb says:

    Where do u get a rotary motor like that that's awesome

  7. Avataaar/Circle Created with python_avatars prawny12009 says:

    Every time I see these vz21 on projects they seem to struggle to flow oil through the turbo and leak from the seals.

    Tbh must be a design fault.

  8. Avataaar/Circle Created with python_avatars stclairstclair says:

    Hello, I'm a retired mechanic and I wanted to give you guys a heads up about MIG welding and ball bearings,
    I would recommend to keep your welding segregated from the turbo, Even though your project had a tight ground clamp
    and you would think energy is not passing internally through parts, it is…
    micro arcing can be induced and ruin your bearings, And because the pitting is tiny it takes a while for the bearings to fail,
    There was a similar thing happening to gyroscopes failing in space satellites that was baffling engineers
    Till they discovered electromagnetically induced energy had caused pitting in the bearings.

  9. Avataaar/Circle Created with python_avatars Firebreatherdrew says:

    Hm would it take so you guys can build me a turbo premade just bolt on to engine turbo kit ill pay I have a Coleman ct200u and would like it turbo ill pay !!!!!$$$$$$$$$$

  10. Avataaar/Circle Created with python_avatars Clayton Csonka says:

    I think they have a boost leak, bc that's why there not makeing any power

  11. Avataaar/Circle Created with python_avatars Owen Bartsh says:

    rotate your center housing, right now you're putting oil in the drain port and draining out the feed port

  12. Avataaar/Circle Created with python_avatars Jerry DeSilva says:

    Something you may not realize. That if the seals are leaking that much, the end bushings will need to be replaced. Did you try to wiggle the turbine shaft, to ensure the turbine isn't going to grind against the housing ? Once that happens the turbo needs to be tossed in the trash can. Turbo's can be taken apart in a matter of minutes. Bushings are a few dollars. Be. Safe, not sorry.

  13. Avataaar/Circle Created with python_avatars Rotary Motion says:

    IN 😃 🇵🇷PUERTO RICO THERE IS A SCOOTER WANKEL SINGLE TURBO IS ½ 13-B ENGINE. 🛵💨

  14. Avataaar/Circle Created with python_avatars 3 Muskaf*cks says:

    Did you know that you wasted probably about $100 to go 0 mph faster

  15. Avataaar/Circle Created with python_avatars CC TPF says:

    Placing a nitrous jet in your oil feed line is a great way to control flow to the spooly booster. Cool project👍👍

  16. Avataaar/Circle Created with python_avatars John Burkhart says:

    Turbochargers need an oil restriction. Add an oil cooler from between turbo body and pump. You kill two birds in one stone. First cooling oil and second you’ll get oil out of exhaust

  17. Avataaar/Circle Created with python_avatars David Hearne says:

    oil drain is way to small and oil tank needs to be vented to atmosphere.

  18. Avataaar/Circle Created with python_avatars trollslayer82 says:

    Based on your looks alone, i was not a bit surprised when you said"lets mount this guy up" .

  19. Avataaar/Circle Created with python_avatars Peter Kay says:

    That's pretty cool guys, enough interest for me to subscribe!

  20. Avataaar/Circle Created with python_avatars MrGixxer1300r says:

    I know a guy who put a VZ21 on a suzuki sv650 and made a 107whp

  21. Avataaar/Circle Created with python_avatars Surferant666 says:

    Wouldnt a jet turbine engine be better lighter and more powerful

  22. Avataaar/Circle Created with python_avatars tunerarmoryVT says:

    Great job! Love it. I own about 15 of them there mini bikes/ mini cycles.

  23. Avataaar/Circle Created with python_avatars Ben Johnson says:

    I am glad you guys don't live around my neighbor hood.

  24. Avataaar/Circle Created with python_avatars Rob says:

    Just so you know that 21G turbo won’t do much for that rotary try the 30g from a older Subaru or Mitsubishi. I have actually made a single rotor turbo go cart it was even carbureted and ran great I premixed the oil with gas 25:1

  25. Avataaar/Circle Created with python_avatars Build Break Repeat says:

    Been reading all the comments and suggestions, thanks for all the input guys! Episode 2 will be out next week but it was filmed the same time as Episode 1 so we won't be addressing any of these problems in the next video. Episode 3 we will get everything sorted with the oiling system!

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