RogueFab M601 Tubing Bender - https://www.roguefab.com/product/metal-tube-bender-m601-1-die/
Tyranis' Video: https://www.youtube.com/watch?v=qZOmH6OA3o4&t=1536s&ab_channel=TyranisCustoms
Mike's Video: https://www.youtube.com/watch?v=UOiWfx1cADM&t=464s&ab_channel=Mikefestiva
Last video we installed a video and in this video we intended to get the right jets in the carb, fine tune the oiling system, and get it dialed in... until we heard a weird noise and the turbo stopped making boost. We took it apart and sure enough there was some carnage. We're at a crossroads now between bringing it back to how it was before the turbo or trying again with a better turbo and system. Let us know!
Thanks for watching and stay tuned for the next video!
**Be sure to check your local laws before driving any non-registered motorized vehicle. Do not attempt these activities at home. All content produced by Build Break Repeat is for entertainment purposes only**
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GPS PARTS:
34MM MIKUNI – https://www.gopowersports.com/34mm-mikuni-carburetor/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Oil Reservoir - https://www.gopowersports.com/aluminum-catch-tank/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Battery – https://www.gopowersports.com/12-volt-9-amp-sealed-battery-chrome-7l-bs-yb9l-b-sealed/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
780 series driven pulley - https://www.gopowersports.com/780-driven-pulley-3-4-bore-aftermarket/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
780 series driver pulley - https://www.gopowersports.com/780-driver-clutch-aftermarket/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jackshaft Brackets - https://www.gopowersports.com/adjustable-jackshaft-brackets-weld-on/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Jackshaft - https://www.gopowersports.com/3-4-jackshaft-not-threaded-19-long/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Sprocket - https://www.gopowersports.com/jackshaft-sprocket-type-b-420-3-4-bore/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
Locking Collar - https://www.gopowersports.com/jackshaft-lock-collar-3-4/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
1” Lock Collars - https://www.gopowersports.com/bearing-3-4-1-3-8od/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
¼” Keystock - https://www.gopowersports.com/key-1-4-x-1-1-4-long-6123/?utm_source=YOUTUBE&utm_campaign=Build_Break_Repeat&utm_medium=Video
AMAZON AFFILIATE PARTS:
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Turbo Flanges - https://amzn.to/3xu2FIe
Exhaust Bend (1.5”) - https://amzn.to/3MDbiFK
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TOOLS
Tools we use and have received from sponsors:
HOBART Welding Equipment
https://www.hobartwelders.com/
Texas Metalworks 40x80 Welding Table
https://texasmetalworks.com/product/fully-fabricated-welding-table/
RogueFab Tubing Notcher
https://www.roguefab.com/product/versanotcher-universal-tubing-notcher/
SWAG Offroad PortaBand Table
https://www.swagoffroad.com/products/swag-portaband-pro-table
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
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Timestamps -
0:00 - 0:30 Intro
0:30 - 1:50 Rogue Fab Bender
1:50 - 2:47 Exhaust Tubing
2:47 - 4:05 Tuning
4:05 - 10:03 Test Drive
10:03 - 11:01 Turbo Teardown and Diagnosis
11:01- 12:08 Outro

In the last video of this thing, we got the turbo all hooked up and we drove it around with it. We had some minor performance gains. We went from 40 miles an hour to 47 on the little strip out here, which is pretty good. We also read the comments and we saw that there were some things we needed to work out with their setup.

Our air filter was too small and restrictive. We had to rich in the jets and the carburetor into some other tuning things like the oiling system. So in this video we're going to do all that test, it out again tune that carb and hopefully get this thing running at 100. Since we moved into the new garage, we've been trying to get the best tools to make fabricating more convenient, quicker and better quality.

So that's why we got this rogue fab tubing bender, it's a pretty sweet unit. It's a roller die system, so it won't scratch or mark up your steel tubing. It's got these clamp blocks here that keep track of your bends and also keep them on the same plane, which is very nice. It's also very strong and can bend thick while tubing and there's tons of attachments.

For this thing, heavy duty attachments there's a mandrel bending attachment, so you can do mandrel bends, so they really put a lot of time into designing this and making it very versatile for everyday fabrication for all types of people. Now, if you want to see someone put this together in great detail, check out our buddy tyrannus customs, he did a great video and also mike vestiva, while some links down in the description. But we got the diy well together kit and it's pretty easy. Just follow the instructions and maybe took an hour or two just to get it put together.

Then we painted it black and silver and may welded together a little rolling stance. We can move around the shop, pretty easy and it's nice and sturdy and it holds our dies and clamps. So that's what we did. That's we got it set up and we're going to use it to do the tube frame and the turbo piping on the rotary atv.

So we're super pumped about this make sure you check out road fab. They have a lot of awesome tools and equipment. Awesome links for that as well. It's time for our first bend with this thing, we're pretty excited we're just doing a small bend for the exhaust, so we're probably just going to go about 15 degrees, but here we go yeah.

I bent that one and a half tube pretty easy, so see how it looks just got to roll it all the way out, but yeah nice easy bend, no scratching very nice. So first things. First, we're gon na change the jets out we're gon na richen up both the pilot and the main jet we're gon na do a pretty decent jump from a 320 to a 350 jet in here for the main jet and we're putting a 50 for the pilot Jet for now we're doing an upgrade for the oiling system we figured since it was blowing all that smoke out. We were having too much oil pressure, so we did this bleed line.

We have a t going in here. None of this is final by the way. We're just kind of getting our sizing right, so we have this t going in here, so your main pressure line goes up and into the turbo, and then we have this petcock that we can adjust and that'll. Let us decide how much pressure we're having so if it starts smoking, we'll lower it a little bit and just keep going until we have the right ratio of oil pressure and lubrication for the turbo so y'all.
Definitely let us know in the comments that you did not like this tiny filter. We thought it was a lot bigger when we saw it in the pictures ordering it online, but we got a new filter. This one isn't huge, but we don't want to hit our legs, so this is as big as we're willing to go, but a lot better. So no, we have to figure out if we're burning oil or if we're super rich, i'm not really sure.

So i think we'll lean out the jet a little bit, because i did jump pretty high on the jets, so the oil, the oil pump, is turned way down. So there's one or two things: either it's super rich which it could be or or the steels on our turbo are bad, so hopefully it's too rich and we'll just try and change out our pilot and main jets right now and see what that does. I kind of like the fog machine yeah, it's fumigating, the whole area, so the plan is we're gon na put our old jets back in. Since we know those didn't smoke like crazy and if these end up smoking we'll know it's the oiling system and we'll have to figure something else out, okay, so now we know that it's i mean the seals on the turbo probably aren't great, but that's not the Main problem i just jumped up in jets way too much they'll have to go incrementally because when it was running with the richer ones, it definitely felt like it had more power, but we're obviously pumping way too much fuel through it.

So we can be reasonably confident that the jets were the problem. It smoked a lot less that time, so we're gon na start with just the pilot jet, since i wasn't really flooring it too much around there and we're going to step this up just a bit. Okay, i'd say that was an improvement. I think it could go a little bit: richer, um, yeah, sorry, we didn't get on video, but we heard a really loud clap and then like kind of a whining noise.

So if i was to guess, i think our turbo's done for moment of truth guys i mean it's still. There there's definitely end play so we'll just see. What's going on see if it's spinning nicely or not so i mean it's it's spinning. I did hear the weird noises still i do, i don't know, maybe 150 turbos aren't the best.

It's got some slop in there. That's for sure. So we checked everything over and it seems okay, the engine's totally fine and all the drive lines. Fine, there's no problems.

There we can definitely tell that, but the turbo does have a little bit more play in the shaft, so we're kind of thinking that it might be worn out or we may have kind of cooked the bearings um for now we're just going to run a little Bit higher oil pressure and that seemed to help it a bit and we're just going to keep tuning, and if we have to get a new turbo, we will have to get a new turbo. Well, i can certainly say that we are no longer making boost, and that is very disappointing. I'm not exactly sure why the turbo exploded so quickly, because we have a very similar setup on a rotary mini bike and we've had no problems. That thing has over 100 hours riding on it and really hard riding.
So i'm not exactly sure why this blew up. We had our oil going, but we could have just gotten a bad turbo, we'll take it off. Take a look at it, but at the moment we cannot tune our turbo rotary because we have no turbo, it still spins pretty freely, which is kind of weird, but it does have a lot of slop. So that's definitely bad earlier today, when we're driving it, we were looking at the boost gauge, it definitely was climbing and after it started making its noises and stuff there was nothing.

It just stayed constant, so we're definitely not making any boost out of this thing anymore. Here we go, let's see you mean it's bad, but i was expecting worse. Okay, the shaft doesn't look too worn. Compressor wheel is fine, so we can see our problem.

If you look here, it's obviously been scraping there and it's been scraping on the inside of this housing, and that was our noise, so this thing's, probably pretty much done. Some of you might have been expecting that, but the turbo is pretty much cooked. It could be just a cheap turbo, it could be our oiling setup, a bunch of other factors, but for now i think we're kind of leaning towards bringing it back to na not to stress out this engine, because it wasn't pretty rough shape when we got it. Let us know what you think in the comments should we should do that and just rotary atv or should try and keep going the turbo direction we'll be reading some of those comments.

Other than that you know it did make power with the turbo for a bit until everything went sideways, so we had a little bit of a success, but now we're kind of stuck. You know we don't have enough time to get parts before this video is coming out, so we're just gon na have to end it here, but thank you so much for watching. Thank you to go powersports for the drivetrain parts on these things, because that is something that's still been. Holding up really well and we'll see you in the next video good job.


Avatar photo

By YTB

21 thoughts on “We blew the turbo on our rotary atv! rotary-swapped atv ep. 7”
  1. Avataaar/Circle Created with python_avatars Tim Austin says:

    Supercharger the thing 👌

  2. Avataaar/Circle Created with python_avatars Tim Austin says:

    What's the fuel premix you using

  3. Avataaar/Circle Created with python_avatars F5 Tornado says:

    Rotaries beg for big turbos. It's like a diesel. They are garbage without big turbos.

  4. Avataaar/Circle Created with python_avatars TYP3STYL35 says:

    Keep it turbo guys! You should add an intercooler or a large volume between the outlet of the compressor and the inlet of the rotary (about 1.5x the ci of the engine) . It will help it make boost and fix the boost gauge jumping all over the place.

  5. Avataaar/Circle Created with python_avatars Costdelta says:

    So what you do is you keep theold turbo housings for parts. If you guys know anyone with a cnc mill and make some bigger turbines and use the old turbo housings and enlarge itfor the biggerturbine. Bigger turbine=better boost

  6. Avataaar/Circle Created with python_avatars Minibikemanuel says:

    Keep working on the turbo!!

  7. Avataaar/Circle Created with python_avatars InsideOfMyOwnMind says:

    Have you confirmed the correct ratio for the fuel mix? If it's oil rich you could be mislead if judging by the amount of smoke and starved the turbo that way.

  8. Avataaar/Circle Created with python_avatars Trifecta says:

    Yikes, maybe you should drop the regulator out the valve intake

  9. Avataaar/Circle Created with python_avatars elesjuan says:

    I can't speak really too much for your specific setup… But I've been rocking a $120 chinacharger on my miata for a number of years and probably 70k miles worth of excitement without any issues on the turbo making GREAT power. I'd start looking at the lubrication system of the turbo as it's possible the seals might've blown out and instead of lubricating the journal bearings, was just pumping the oil into either the intake tract or the exhaust instead.

    I too would be interested to see you guys rig up a supercharger on this lil rotary guy. Common superchargers for small engines is an old school VW vacuum pump, which was literally a small 2 screw blower.

  10. Avataaar/Circle Created with python_avatars mustard_tiger_ says:

    Use an old belt driven smog pump as a supercharger

  11. Avataaar/Circle Created with python_avatars three wheela says:

    Smog pump supercharger time!

  12. Avataaar/Circle Created with python_avatars Liam Hughes says:

    You should look at the AMR300 supercharger. I have run one of these on a 303 and have seen plenty of people do this on KM24s. sounds great!

  13. Avataaar/Circle Created with python_avatars Greg Webb says:

    Love the rotary content.

  14. Avataaar/Circle Created with python_avatars Darril Buchanan says:

    boosted for sure. I'm voting Mitsu T25 turbo. That would be wild brother 🙂

  15. Avataaar/Circle Created with python_avatars nashguy207 says:

    Just run it without the turbo. Save the engine to live longer!!

  16. Avataaar/Circle Created with python_avatars Harley Carter says:

    Try again

  17. Avataaar/Circle Created with python_avatars ChiefJustice Middleton says:

    Turdo made in Chyna, no good like that.

  18. Avataaar/Circle Created with python_avatars lukas sonntag says:

    Supercharger

  19. Avataaar/Circle Created with python_avatars MikeOrkid says:

    Turbo again. Set up a new "oil pump" with a low pressure (carbureted) fuel pump (and the bypass) Turbos don't need or want a lot of oil pressure. It would be nice to have a stator for power too. Run a wideband and an actual switch for the oil pump. I'd also say lower the gearing. That engine can only spin so fast regardless of power. Get new sprocket setup for better top speed. You should have the power to pull once it's running right.

  20. Avataaar/Circle Created with python_avatars Miguel Angel Almonte says:

    Turbo

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

    What do y'all think, should we try again with a more expensive turbo and better setup, or revert it to the pre-turbo configuration? Let us know! Sorry for the late video this week, we've been busy working some summer internships!

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