Building the 4 Rotor for the most HP we’ve ever attempted. TV Show race prep
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- čas přidán 30. 01. 2023
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Some people are buying the shirt and hoodie without adding the poster to their cart. Ill still include the signed poster regardless!
would it be possible to have the specifics on the sizes cuz some brands im a large and others im a medium
Try to fit an ISG( ingegrated starter generator) on the accessory drive and you will get rid of kore weight on the flywheel
Although this will take some effort to get it going with the electronics unless there is a standalone solution out there
Can't wait to receive my clothes, poster and badge! First time ever buying a hoodie with any design, love that it isn't as over the top as most CZcamsr merch.
what a g
I would order some but your missing my size 😭
Rob is making moves on TV since the days of The Bachelorette
Thank you I had to look back at the twelve years ago rob, I never knew he was there….. still the same guy just as fucking funny
@@lilmike1780 that Bachelorette lost out big time
Greetings sir. We need more videos!
@@802Garage I'm making career changes to bring y'all context
@@ThatV12MiataBruh 🙏
Me watching this knowing damn well I'll never own a rotary engine: "hmmm that's a good tip to keep in mind Rob"
😂😂😂
By a 13B ROTORY. They not that expensive and make good power. My rotary is going into my Fiat X19. Hopefully in this year before my birthday in September. Present from me to myself. Haltec management every thing is lying and waiting
Aldo stefanini that sounds like a cool project. I love the x1/9
@@TheCluelessEnthusiast yeah I can't wait to start it. Don't think many X19 has a rotary inside. Most common swapps are honda k20 motors. I'm only waiting for a gearbox then i can start making the engine mountings etc. It's definitely going to be fun as the car only weighs 700kg
@@TheCluelessEnthusiast and to get 200kw out of the 13b is easy. So you can work out the power to weight ratio
This car is about to break records and I am here for it. Great job Rob on the prep
Very happy you have someone like Erica in your life. It's so important to have someone like that who always has your back.
i didnt know the welder's name was erica
@@Neeboopsh Lol!
To your discovery on the silicone / RTV. Most people think that RTV is what does the sealing when sealing 2 surfaces, when in fact most of the sealing is done by metal to metal contact. Which is one reason why checking for warpage of housings and irons is so important. A slow drying RTV is more desirable when assembling a complicated engine so that there is time for the sealant to squeeze out as much as possible during assembly. For this reason I actually use the hylomar on the legs of the engine if assembly time will take longer than normal.
That definitely makes sense to me as I learn more. Now that I have more experience with hylomar I can see why you say that. Appreciate the tip!
@@RobDahm Hylomar is likely the sealant you’ll also use on the Indy Car gearbox. I’ve been using it for decades on Hewland gearboxes with excellent results. It is oil and gas impervious and never completely dries, always staying tacky. It will actually reseal after a fast gear change when there isn’t time to clean the surfaces. Buy the good stuff, not the off brand.
@@RobDahm as an additional to this and the complication in flipping it, would you be able to make a dedicated build rig/table that works similar to a traditional engine stand in the way it gives you the ability to flip/rotate the engine?
you should get the oil tested to see if the tungsten you put on the E-shaft gets worn off
Anyone without a Valvoline hookup; use Blackstone.
I don't think it's necessary to do a lab check. The yellow residue might be the sulphur or tungsten that broke off the compund. WS2 is a dark colour, so leaving a yellow residue might indicate it broke down into tungsten oxide or sulphur oxides. The oil in that case, in a lab check, would be more acidic than usual. Please correct me, if my thinking is off, or anything.
@@sirboiledpotato1314 I dont know about all that, but a lab check can let you, if you know what to look for and the material make up of certain parts, allow you to see if things are breaking in properly, or wearing excessively before catastrophic failures happen. Example, Catch it Before a block decides to shit a piston, or possibly even make a rod knock that is audible to the human ear.
It's a very good practice on ANY performance engine - think of it as cheap insurance.
For heavy machinery it's often done as a matter of course as a requirement for the warranty.
Housings chrome surface looks terrible
The attention to detail is amazing. Measuring everything, checking everything, explaining everything. You can see Rob's passion just by the way he talks about the components and his findings with this rebuild. The genuine desire to learn and improve and evolve. It's remarkable.
What do you expect he's had this car apart to every single nut and bolt multiple times he knows every little scratch and ding rattle etc over every square inch of it lol
I couldn’t have said it better buddy!! He’s seriously a genius with the technical stuff and innovation 👍👍
Rob's reaction to the possibility of getting a 4 for $4 is so pure
fo fo fo
rob, hope you see this:
helicoil taps (and thread gages) are always labeled by the size of the threaded insert they tap for. helicoil taps will usually say “STI” right after the thread dimensions so you can differentiate them from a regular tap of the same labeled size. in your case, the helicoil tap should read “M12x1.25 STI,” meaning it taps for an M12x1.25 insert.
You should get yourself a spring loaded tap guide, great for manual mills/lathes, Cncs, or even drill presses. Makes life so much easier and your holes are always tapped straight
Came here to say this! I’ve hand-written enough Haas programs that I wouldn’t have hesitated to rigid tap with the CNC, but I can’t deny that it’s one of the freakiest operations to run when you’re first learning it. Rob definitely did the right thing using the spindle to line the tap up but a spring loaded tap follower would’ve made it a lot easier.
You know it's a good week when Rob uploads an hour long video!
Dint even realize was 1hour... Dam
Dahm
Rob have you ever looked into cryogenic coating for the housings, apex seals, and rotars It's a little pricey but it's well worth it. It makes parts that rub alot stronger and more slippery for less wear.
There is also a company called Microblue that I think could be even more beneficial.
Plus wpc coating
@@jhon-cg4rg Agreed WPC has a lot of benefits; I'm surprised it isn't more mainstream yet.
Do you guys use this, have you used it on a high horsepower engine?
@@bravozulu3257 Yes; I've used WPC on transmission parts / gears of a racing motorcycle engine.
The tap is an STI tap, which keeps the same thread pitch but in a bigger OD for the helicoils to be able to go into, producing the right size thread pitch diameter once the helicoils are actually in place. Also ypu should get a proper tap handle and also a tap guide, which is a spring loaded pointer that keeps tension on the tab as it threaded in to keep it on center
This guy taps
I've heard it called tap follower but I thought the same thing.
I was gonna make this comment, but figured someone probably beat me to it. LOL
Bring on the six rotor although bloody love the four rotor and can't wait for the CF body
Rob, when I was a freshman in high school, I participated in an after-school curriculum. After that ended, I had a two hour window before my dad would pick me up. I would walk to a McDonald's a mile away and get food in the meantime. On one of those afternoons, you posted a video explaining how your four-rotor had been lost, that was 2015, That was a core memory that I have while watching every one of your videos, I'm 23 now, and I've never stopped loving the progress on your projects. Keep up the good work, from a fellow michigander!
When watching Rob's channel one must continue looking at the timer for when it will finish because one does not want to be disappointed and wants more even after of an hour plus video. One must be patient for there are many to come 😎
Every damn time, I knew I couldn't be the only one who does that. I also do it when I'm watching Steve Morris.
@@Ivegotnochoicesilencemyvoice lol
One of the best videos I've watched that you made in a bit. Not that the other videos are bad but I just really enjoyed watching you build the engine!
Did come dangerously close to an actual outro, though...
Putting aside for a moment just how insane that engine already was, I can't even begin to describe my excitement at the prospect of it revving from 2k to 10k in the tiniest fraction of a second!
Also love, love, love these long form build vids, they are incredibly educational.
Looking forward to buying battle tested 13B internals from Dahm Racing Co. in the future too!
Hi Rob. I'm Ray. I'm an engineer. The purpose of the oil groove in the bearing allows the oil to come through the supply hole, flow all the way around the journal and have the same oil pressure all the way around the journal to push from the middle outwards between the bearing and journal. It achieves the most even flow around the bearing as possible. A race motor typically has larger clearance on the bearings. This makes sure that when the crank (or eccentric shaft) flexes and bends more under the high horsepower and rpm, the journal surface doesn't touch the bearing material (as you know there should always be sufficient oil film in between). This larger clearance means that more oil flowrate will pass over the bearing and therefore the groove needs to be deeper to accomodate the extra flowrate and keep the pressure even all the way around the bearing.
Your 4 rotor rx7 is basically the closest we've got to a rotary super/hyper car - other than the furai or RX vision.
Thank you for building this work of art.
If only Top gear didnt kill the Furai .
Can't wait to see a quality inline 8
@@rya3190 hell yeah the 6 rotors are epic . Ash from Misfire Channel is doing a 8 rotor
@@ClwnJuNkY Does the eccentric shaft run into similar issues with the old inline 8 piston engines, where they were prone to breaking their crank shafts?
@@ClwnJuNkY True, but hopefully Mazda still has the blueprints somewhere. Apparently the Furai's engine was a 3 rotor Renesis; R20B. I've always been curious to the design, my guess is that it was similar to the rx8, but the side housings must have had the peripheral exhaust ports. If I'm not mistaken it only had 450bhp, but it was enough to deliver reasonable performance.
on one hand i should get to bed
on the other hand: Rob Dahm uploaded
same here :)
All my friends are busy playing video games. I'm over here busy watching over an hour long video of Rob rebuilding the 4 rotor. 10/10 would do again.
I see a Dahm notification and I click it immediately, no matter what I’m doing
Even boofing your boyfriend?
This is the way.
1h long rob dahm videos, ist there anything better? 😍
I very rarely watch videos from beginning to end, but your content and its delivery is second to none.
@Rob Dahm
You need a tap follower. Same concept you were doing with the drill bit. You have a spring loaded chamfered pin that you load into a chuck then preload the spring over the back of the tap with your mill spindle in the center of your hole and spring pressure follows for a little while (can repeat preloading as you're progressing) and you have a near perfectly straight and perpendicular thread.
I love how Rob is turning his shop into a lab, the mad scientist he is.
Rob, that tap should be marked STI for Screw Thread Insert, and it most likely also has the HeliCoil logo etched on it. The labeling on those is one of the reasons I prefer KeenSerts over helicoils.
1 hour? Let's goooo
God I'm so damn excited for my shirt thank you for the motivation and content.
Rob, wishing you the best of luck on this venture and I think you'll really enjoy those apex seals giving you zero grief at 40+psi or however high you end up landing. Great documentation and fluidity of work.
Woooo🎊🎊🎊🎊 dear active fan
You've been selected for today's giveaway exercise🎁🎁🎁🎁🎁
Dm the above number⬆️⬆️⬆️⬆️
To claim your prize
Rob getting ready to change the earths rotation with all that Dorito power!
Maximum spinnage!
Hey Dahm 35:57 there should be a purpose made tool just for this. I know on a lathe a 'spring centering tap tool' would be used. I bet you could use one here too
Rob thank you for inspiring all of us and for me personally falling in love with rotories even more. To the point where I'm currently working on rebuilding mine now. My 89' FC with the 13BT. Thank you for the motivation and can't wait to enjoy the rotory life!!!!
1 hour of content ? Lets go rob love ya 🔥 continue giving us the sick content!
I have never had any interest in rotary engines I’ve never even tried to understand how they work and I am legit the kid that used to take his television apart to understand how it works. Rob’s ability to convey the details of a rotary and include his passion is really inspirational. I will still never own anything rotary powered but you have my attention. Also is there a limit to 4 rotors or have people built more? I understand how Rob explained the twin turbos sound difference I’m just curious if you are able to stack rotors based on fit or science
I've seen a six rotor in a video!
I'm so happy that Rob is doing Mazda's job and actually working on improving my favorite engine
@Rob Dahm I agree the helicoil tap saying M12x1.25 is confusing, but that is standard in machining world. If you look at the first few letters before the M12 on the tap, it says "STI" which means "Screw Thread Insert" tap specifically oversized for helicoil inserts. I used to be a machinist and learned that lesson the hard way 🤣
And I thought "STI" was a nasty disease?
That tap should be labeled as an STI tap specifically for helicoils also you should look into thread mills for things like that they are fantastic
An hour of Rob and the crew building donut machines? Yes please, perfect for working along side.
So happy to see a long video. So sad when it ended. But you have to be happy it happened, not that it’s over.
The Title got me hook, line n' sinker! That's the stuff we like to hear! LESSGO! 👏🏻👏🏻
I love the Rob used the $17.99 Amazon special BILITOOLS thread repair kit on his $1,000,000 engine instead of dropping $53.75 on the legit Heli-Coil. Just something so relatable about that. 😂 Then he used the $10,000,000 CNC machine to drill and center it of course. I wonder if he watched the Torque Test Channel video on thread inserts like the rest of us. 🤔
Notification gang
I love seeing how much you progress on every build. One other thing I would recommend is a paint pen and marking the head of the bolt after you torque something. It's an easy visual key if something is getting loose and also if it has been torqued. Good luck with the race!
Rob PLEASE do a teardown and analysis of the CX30 rotary engine once it hits the streets. The DIY community is frothing at the mouth, there will definitely be retrofit kits in the future to adapt the new platform to multi rotor setups.
Love wakeing up to an hour long Dahm video, like how much detail you add in your vidoe. Can't wait for the next video!
Really enjoyed sitting back and watching the whole video. The quality of content is great to see, quite informative despite not yet having dipped my toes into the rotary realm..... watched enough rebuild videos to know how they go together, areas to be aware of and some tips for easier assembly. Keen to hear the 4-Rotor sing and make those big numbers!!!
3:23 "we're about to see some really crazy shit" definitely has "when this baby hits 88 miles an hour" energy.
I have met Rob quite a few times, and no matter how crazy busy he is, he is always a genuinely nice guy. Unlike other car people I have met. I Wil buy 2 just to help support!
Dear valued subscriber❤️❤️❤️❤️
It’s another giveaway exercise today
🎁🎁🎁🎁🎁 and you’ve been selected
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Rob's videos are always perfect, keep going
Thanks for responding ✅✅✅✅✅✅
You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁
Dm to claim your prize 🔝🔝🔝🔝🔝🔝
I usually skim videos but I watched this one almost in entirety. Great work!
Be cool to see this entire rotor build in a series 1 after another cause this is beginning to be one very indepth build getting into things most may not or barely would keep up great work
Rob should make a purpose-built engine stand/table for assembly for Rotary engine. my heart skips a beat every time i see Rob put extra weight on the engine, balancing one side on a cardboard box :) As usual, great video.
Grinding sand crabs in Runescape while watching Rob. A great afternoon
Rob is spoiling us with these 1 hour videos and I love it.
Best CZcams channel by far!
Something that works for me sealing bolts and shafts. I rebuild race and truck gearboxs and we simply used red loctite that was to oil or pressure. Any soft setting stuff was no good but loctite, never leak plus the added bonus. Also red loctite 518 for all sealant surfaces, amazing stuff, you will never use grey silicone again. It only sets with no air so heaps of time building is allowed.
Got a Valvoline ad as soon as the video ended. That’s just too perfect lol 🙌
Dear valued subscriber❤️❤️❤️❤️
It’s another giveaway exercise today
🎁🎁🎁🎁🎁 and you’ve been selected
Dm to claim your prize ⬆️⬆️⬆️✅✅✅
Rob you strive for perfection in every part of everything u do that's why ur successful! So happy to see the current results I went back to watch this love this build always have since inception
Rob, I have one more suggestion. Get a tap wrench, and look for a spring loaded tap guide. It spring loads in the hole you used with the drill and will keep the tap straight for longer.
watching you rebuild these rotors is always interesting .piece after piece carefully assembled, till it's done.but i cant believe i just went through an hour video 😂 time flies watching you build Rob..it's good
These long assembly videos are what makes this channel special.
Great you're taking shipping into your own hands! I'm still kinda upset that my first order never arrived/shipped nor received updates or support... But glad to see you improving and hopefully even more!
4/4! Rob is officially: The Seal Whisperer
Favorite line! “All those people that were saying you can’t do this,….so quiet.” 😂🤘🏼hell yeah!
Hey rob! When milling cast iron, you dont need to use coolant because of the graphite content, it works as a dry lubricant
Love seeing my Dad hard at work
Spring loaded center punches are great for centering taps!
Great effort mate.
Cheers from Brisbane Australia 🇦🇺
I gotta say I love the longer tear down and build videos. Awesome
Great video Rob. Love the attention to detail and the added R&D touches. Think the sealant on the e-shaft end and spline will probably come off with the amount of rotational inertia it will endure. Quick check on the oil filter after spinning it up will tell for sure. Can’t wait to hear it roar
I remember watching you rebuild this engine for the first time; wanting so badly to build my own. Finally I got my own fc, re-built the engine myself and got it running again. Watching this video made me so happy, I wanna pull the engine again just to make sure it's healthy and happy too. The hoodie is sick, good job.
Four Loko...under the carpet.
Thank you Rob for explaining how twin vs. single 4-rotor manifold completely changes the sound of the motor. Always wondered why these things could sound so different! Once i heard your analogy of the "double 13b" it made complete sense!
Notable example of twin manifold (4-2 or 4-2-1 header) is the IMSA GTO RX-7 and Defined Autoworks RX-7
have you thought about trying anaerobic sealer? I was against it at first and didn't think it would work well but then I tried it on a NV3550 transmission that I had to take apart multiple times to figure out what someone else did wrong to it. So when I took it apart I was impressed with how well it actually worked. The anaerobic sealer is specifically for sealing machined surfaces so it squeezes out all the excess and fills only the imperfections and only cures once it is compressed leaving the squeezed out material non cured forever. That's why I didn't expect it to work well because the goo on the outside never really dries but when I pulled the transmission apart it was fully cured on all the machined surfaces and left almost no material where the surfaces had fit together perfectly and the best part is you can take your sweet ole time assembling.
Rob please get yourself a proper tap wrench and a sprung centre for when you’re hand tapping on the VMC. It will help align everything so much better and also result in a better sized thread.
I’m an engineer from England that spent years in an apprenticeship learning my trade. I love the content, keep it up.
No one reels me in like you do with the techy stuff I love it.
I feel like you're solely responsible for the majority of us understanding the rotary engine at least on a basic level nobody's really talking about this high horsepower stuff thanks for not being a gatekeeper.
Not sure if anybody else has mentioned it yet, but when tapping you can use a tap guide and handle to keep the tap vertically aligned. It’s essentially what you did with the drill bit, but a little more accurate and easier to control
Adam LZ is struggling to hit 300bhp with his 4 rotor, and here you are putting the engine together yourself and then likely making the power figure you want. 👏👏👏👏👏
I never get bored of watching how this is done! Always amazing! Keep it up love it!
Best one so far...getting better everytime a big thing comes up...get out there and kick ass. This team has a lot to be proud of. Cant wait to hear this beast eat...looking forward to that content.
Literally been thinking about the Keeps thing for years…… glad to finally have confirmation
The thread insert is great piece, even in aluminium, you can torgue the hack of it and dont need to worry about it ever again. They are very hard to mess up once get them in good way. Great work, looking forward dyno run.
Attention to detail is an understatement. Luv you Rob.
1 hour Rob Dahm video first thing in the morning... Great way to start my day off work. Haha
33:43 is the most conclusive evidence that Rob is officially a machinist. To hell with turning out nice work, if you don't curse your machine you haven't used it enough.
Your videos are awesome - Mini engine documentaries. Thanks for taking the time to make this content along the way!
You are amazing 👏!!!!!!!!! Love this stuff I went to school for piston motors. But from these amazing people here I am learning a lot about rx7s..........
Rob talking about four loko and 1000hp motor memes is what I needed today 😂
Rob if you you closer at the tap in the kit it will have the "STI" in stead of UNC or UNF. So its a "standard thread insert" tap for a 12x1.25 thread. All taps for thread inserts should have it so just keep them separate from your regular taps so there isn't any oopsies
yo rob something just dawned on me while watching the apex seal installation. apparently its crucial to install all three simultaneously you could either mill or 3D print a tool to make installation a breeze. and 3D printing tech is so good at this point theres a ton of materials to print. depending on specific needs. just an idea thought id pass along. keep up the good work and ill keep watching. later
I like the new flywheel, the oil pass throughs will help oil the clutch much better!
In short: With the greater clearance the oil flow out of the bearings will be higher. With a shallow oil groove the oil pressure on the side that is 180 from the E-Shaft oil port may drop due to decreased flow from restriction(and whirl). So the oil groove is deepened to allow the oil flow/pressure to remain constant in 360 degrees. If your oil pump isn't upgraded for high flow(I can't remember, but assume it is) you will see a drop in oil pressure in this build. Even with an upgraded pump you may see a drop in oil pressure on this iteration of the engine.
This video is so relaxing watching the motor go together
The deeper groove in the race bearing is probably for more volume of oil on the bearing. To have more oil available on the bearing for proper lubrication of the bearing to journal surface
A tip I've learned to line things up in the mill, use a gauge pin that fits tightly into the hole, but put it in the collet and line up the table till the pin just drops in the hole. They also have spring-loaded plungers that can help guide the back of the tap to provide even pressure as you tap (and keep things fairly aligned).
This reminds me of how fun putting rotaries together is. I haven't had to do it for over a decade, but I expect I will have to do it again eventually...
Helicoil has saved my butt several times. Will be using it again this weekend, stripped threads on my oil return line in oil pan
Just finished. That was beautiful. I love this content