The right way to build a BULLETPROOF 2 Rotor on a Budget.

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[@streamcyper]

I absolutely love how far Rob and the guys have come, but every now and then I can't help but miss the chest GoPro at night clips when it's just Rob working by himself figuring shit out as it's being filmed....

[@RobDahm]

The next big video will bring you back to it. The full wiring harness experience haha

[@streamcyper]

@@RobDahm That sounds awesome! Can't wait!

[@minutemenus]

@@streamcyper y'all are everything of KZbin channel should be you set the bar for everyone else 😜

[@pipisugbo]

@@RobDahm you're taking us through hell with you? 🤣

[@rickcupola6262]

Rob Dahm: **uses the CNC* *machine to have* *high accuracy in* *fitment** Also Rob (34:10): "Torque value on this? It's... yes."

[@matheuswohl]

seems legit

[@PenumbralFigure]

Torque value = all of it

[@XBullitt16X]

Sometimes you just don't need a torque number and can go by feel.

[@feffe85]

@@XBullitt16X indeed! 3x ugga-dugga = enough :)

[@SomeGuysg]

that is called dahm spec building :D

[@joealex65]

**"Find out why Rotary shops hate him, you wouldn't believe it!!!"** 😂😂😂😂

[@a_person_7477]

Lol *WHAT ROTORY SHOPS?!?!! Is that even a thing?!?! LOL*

[@MarinatedPasta]

@@a_person_7477 yes

[@joealex65]

@@a_person_7477 Yes you dingus, its a thing! shops that only work on Rotary powered cars! 🤦‍♂️

[@brent5832]

@@a_person_7477 people are soooo serious

[@rotorhead5826]

That is either a bad joke or hardcore ignorance. Do people really think that shops that only do piston engines are all that's out there?

[@CMDRSweeper]

Ouch! I remember when Rob said: "I do not know what I am doing... But I will." Well to the haters, that day is getting closer and closer, and I guess it is scary when you see where Rob has come from.

[@customftr4069]

@@mostlymotorized end mill or drill its not going into solid material. Speeds and feeds and end results are what matters for his application.

[@Shawnster509]

Best ending ever! I was waiting for it and you still caught me off gaurd... Classic Rob endings

[@mercifulmerc]

😭🤣 best shit on youtube

[@Nitrocity7151]

Legitimately caught me by suprise

[@djaydeved]

rob's famous blue ball surprise! dont know when he's bouta blue ball ya, but it always hurts when he dose

[@barrels5262]

He is the GOAT of outros

[@MattyEngland]

A class action for the ball damage we've all sustained? 🤔

[@DBTechYT]

I have such a love/hate relationship with the way Rob ends his videos LOL

[@djaydeved]

the ol' blue ball edging routine! ye edge the entire way then get blue ball'd

[@MattyEngland]

He comes, he stuffs holes, he leaves....best endings on KZbin 😂

[@nagizah8]

I just want to see the rotary vette go against an LS swapped RX7

[@teabee44]

Oh it's coming

[@Speedy_2nr]

If Adam LZ didnt sell his ls swapped rx, that could have been arranged

[@hermanmcpootis5425]

I think it's going up against twerkstallion, but who knows... Hert recently put the LS back into that old chassis IIRC..

[@joealex65]

@@hermanmcpootis5425 Noup, it's going against Suppy's LS RX7

[@joealex65]

@@Speedy_2nr It's still happening, Hoonigan has an LS swapped FD 😉

[@SAMMIT]

Hey Rob, wanna build me a 13b & ship it to me in Japan? 🙏🏼🙏🏼😅

[@patorikkubaketsu8845]

That would actually be so cool

[@Snoo42]

I feel like rob would be proud to do something like that

[@G_Ozare]

Ah, hooked after driving Tomoya-san's FC I see. The first Rob Dahm- Built Rotary engine in Japan? LETS GOOOO!!!!

[@Odd_Redneck]

u gotta get a corvette 1st🤣

[@UsedLegacy9]

I’m all about this 👌👌

[@pipisugbo]

Cut drainage channels in your jig, and use compressed air to clean it between parts.

[@LightGesture]

Best comment

[@EthicalGG1]

Can you build these then take them to an engine dyno to get real numbers, or buy your own engine dyno. I think it would be cool to know how much hp is gained by things like the exhaust port.

[@CygnusRising]

So, what I'm hearing now on this one way 'can't stop, won't stop' train is that you need a CNC lathe to turn perfectly matched dowel pins from precision ground stock. My vote is to call the CNC side of things Dahm Rotary Precision Machining (RPM). I mean, just think that your slogan could unironically be some version of "RPM: It's over 9,000!"

[@dmitrykovalenko2669]

That is some smart marketing! Almost Dragon Ball Z kind of stuff

[@GuyWithACube]

“This motor doesn’t make a lot of power” Later in the video “this motor made 570” Rob I think the 4 rotor has tarnished your view on what us normies view as a lot of power

[@stal5861]

Based on your comment I assume you haven't owned a car with 500+hp. I owned a car with 605hp for a couple of years. You get used to the power so quickly, so I really can relate to 570 not being that much power.

[@GhostOfDamned]

Me in my 90hp shitbox Waiting for rotary swap ;-;

[@pedrorodrigueziii4859]

Yeah I'm over here in my humble Mazda6 at 250hp going WEEEEEEEEEEEEEEEEEEEEEE while he has a 2 rotor making almost 600hp.

[@jaydennicol974]

@@stal5861 my 140hp na 13b is crying rn

[@stal5861]

@@jaydennicol974 Stock 13b are fun in a different way, just like the stock K20. Awesome engines

[@friendlyneighbor6006]

Love how Rob went from working on computers to damn near manufacturing high end rotary engines! The passion and dedication this man has for rotary engines is unreal!

[@ty2148]

Pro tip. Put your coolant seals in the freezer and take out right when needed. They will shrink to normal size.

[@scotty305]

Thanks, I wouldn't have thought to do this. Which coolant seals do you prefer?

[@FlockerLP]

they expand tho

[@chuuwieee]

When you start selling your billet engines, I'll buy one and make a 13b swapped STI

[@lemonmaster8933]

NOOOO

[@josephrizzo7720]

There’s one that competes at gridlife

[@bubferner2146]

Head gasket issue: Resolved ✅

[@lemonmaster8933]

@@bubferner2146 well yes, but some other issues may be apparent....

[@anyau]

i hope he ships world wide. would love to put one in my s130

[@agenericaccount3935]

Will never build a Rotary. But I’m here for the POV on a wickedly explicit scene all the same. Building vicarously through your efforts.

[@jasonball171]

Rob, this is a prime example of the 6P’s ( proper preparation prevents piss poor performance) . The last 4 years of learning got you to this place very well done.

[@dylansayles8383]

To take away the issue of the die walking on your dowels, you could cut the the thread* on the lathe instead.

[@slidey1788]

Aka: cutting the threads properly.

[@brycederring]

he could also threadmill it if he wants to run everything in the haas lol

[@slidey1788]

@@mostlymotorized I'll give you that in terms of absolute best for strength. Not many small workshops have the gear for forming/rolling external threads. If you have the tooling though, it's the only way for high strength. Bear in mind though, even with cut threads, the thread length only needs to be 1.5 times the thread diameter to be as strong as the same diameter bar.

[@mohdfaizul5931]

@@slidey1788 true on that...dont overcomplicated things that are simple..

[@mohdfaizul5931]

@@slidey1788 true on that...dont overcomplicated things that are simple..

[@ilovehappyemos]

Great job! One note, though. I'm a machinist and everything I've ever heard is to cut cast iron without coolant. It will make a sludge that can cause all kinds of problems. Cast iron can handle heat pretty well because of it's thermal mass, and the short cuts you're making shouldn't cause too much heat in the cutter or the workpiece. Keep learning! you're killing it!

[@damonwarren649]

I think he’s better off running coolant with the reamer. For the exhaust porting would definitely be better off running dry like he did but preferably with air blast just for chip extraction. He will most likely get better TL running dry on it too because it will have less thermal shock on it. Either way going back and forth between aluminum and cast iron the tanks going to get sludgy all that dust will be nearly impossible to clean from the machine between runs especially with how haas coolant drains. He’ll just have to keep the tank clean

[@rotorhead5826]

The tanks on those particular machines are very easy to clean. Cast iron won't be an issue. It will stay in its dust form and settle at the bottom. What little that doesn't make its way to the tank will be covered by the oil in the coolant after the water evaporates.

[@adriaanc1296]

20:56 the heck man you earned this. all those nights wracking your brain to fix a problem on an engine a lot of people considered a joke, and showing all of them that this is no joke. dude you are an inspiration. I aspire to dedicate myself as much as you did to gain knowledge on what you are passionate about.

[@_Despair]

Rob: How to build 2 rotor on a budget Me: Interesting, I'm building a 2 rotor i watch. Rob: Here's my near new crate Mazda motor being opened. Me: Ok not too bad so far, they're about 10k tho, not exactly budget but i get the idea. Rob: Now lets use my $200k cnc machine to make some studs and dowels. Me: hmmm what is this budget you speak of?

[@kb9oak749]

Apparently he has a bigger budget. I just watch for the gains.

[@richardtankersley7050]

The budget is the same as the torque value “yes”

[@AzureCrux]

You don't have to do this yourself, but when he says "on a budget", he's talking about spending less than half of what you'd normally pay for machine work for a "reliable" high HP rotary. He's just showing you what to get done for the cheapest path to 700 HP (on a fkn 1.3, that's insanity)

[@shaynegadsden]

Yeah never looked at the price of a crate motor but 10k isnt much less than a full billet one

[@MichaelHybrid]

Porting by hand has always sketched me out. Can't wait until I can send my plates to get em done right.

[@pedrorodrigueziii4859]

Yeah I'm about to restore an 88 GTU and drop a 13b in it and I'm hoping the option to just pay him for this service is a thing by then.

[@Bird_Brain_Dave]

Rob Dahm is the billet rotary god!

[@NJGhost34]

This is the true definition of self made. Who remembers Rob in the blue wall garage doing window tints, wraps and ceramic coating and crazy wiring in the beginning? Much respect Mr Dahm. Keep going

[@Matty.Hill_87]

I love how confident you're getting tearing these things down, modifying them are rebuilding

[@MikeLeader]

I remember when you were building this motor to put in to the vette the first time around, it's great to see how far you've brought all the builds 😁

[@DaddyWarlocks]

Rob Dahm, you greasy Ben Wyatt that ending was the best yet!

[@jryalls]

You should probably protect your hands when coming into contact with the Cutting Fluid in your CNC machine.

[@SgtStinger]

As long as he doesn't have open wounds on his hands it's fine. I do have a big scar from getting some old crusty cutting fluid in to an open wound one time though.

[@ChaosAura]

A lot of modern oils used in cnc machines aren't that bad. I never wear gloves at work, and I'm running multiple machines. My hands are fine.

[@STimedic1]

Valvoline VR-1....it's what bearings crave! I love how the cats are still the secondary focal point in some of the videos.

[@catxx5480]

Been waiting a week just about 2 go 2 bed then rob puts up lol

[@deathangel66609]

Hey Rob some quick tips 1. make a spare base plate for when you wear your current one out so you keep tolerances 2. you need a 5 axis machine min for your bridge porting just to get the accuracy your looking for

[@McShrimp]

Nope

[@Andrewlang90]

With good tool paths, you should be able to get repeatable ports done on the mill with basically a 1/4” or 3/16” 4 flute ballmill endmill. Edit: I was meaning the intake, not the exhaust

[@beerustheblack2846]

Fusion can be kinda clunky machining underneath ledges (in my experiance), and if there was a decent amount of core shift in the castings your datum plate and thus toolpaths may be different from subsequent irons/housings meaning you leave bugger all wall thickness

[@Inimigor1]

I thought we got blue balled at 28:38, moved the cursor and was happy it was just edging for the REAL blueballing.

[@jameschaplin9410]

You need to start looking for a cnc lathe so you can start turning your own dowel bolts, then you can experience single point threading instead of tap and die. Sandvick is the thread tooling to go with. Keep doing awesome things Rob.

[@big-R]

This gives an idea of how much work it takes to open one of the reputable tuning shops. It is insane! Someone has to dedicate their life to this. Thanks, Rob, it is amazing.

[@kodystclair9774]

I love that 90% of commercials from damn channel are Valvoline. I'm glad to watch them 💯%

[@midnightfd3s]

I can't believe that was 34 minutes... I never wanted it to end 🥲

[@teabee44]

I feel a little shade in that description lol

[@marquismccray5674]

Ig they smoke a lil weed. I don’t think rob supports, he throws a lot of shade about it

[@flamerider714]

I don't get it bro?

[@teabee44]

@@flamerider714 if you know then you know. Kinda inside joke. Don't want to be spread shit that's not mine.

[@titanary68]

Dude I can remember when you first started the rotary engine stuff on your channel, watching you go to shops and so called rotary experts for help in your builds and now you know and can do shit with a rotary that would blow all of their minds. Truly a case of the student becoming the fuckin master. Truthfully I don’t even care about rotary engines but I don’t miss a single video you put out. You took the rotor game to the level beyond the next level and I love it. I can see in 5 years you will be the rotary engine equivalent of Nelson Racing. Keep doing you bro it’s inspirational for damn sure

[@zamant88]

As someone who used to listen to all the negative issues with the 13b and rotary engines, Rob has single handedly shown that the rotary's can be reliable, strong and powerful. If it wasn't for Rob, there would have been a lot of people still ignorant, so Thank you Rob! You have shown through great dedication and effort that perseverance does pay off. - A new fan of the rotary

[@zacheusfass319]

I love how far he's come from having people assemble his rotorys to building and machining his own bravo sir bravo 👏

[@zanny7011]

Hey Rob, won’t it be an issue for the dowels to be so accurately fitted into the three pieces, when aluminum and cast iron expand and contract at different rates? Won’t that stress the aluminum at the dowel points?

[@arcadiagreen150]

I dont know a ton about rotaries, but I'm thinking the coolant routing may keep all materials at a relatively similar temp. Otherwise I don't think Mazda would have used irons along with aluminum housings. I dont get where you are coming from. If the dowels somehow manage to expand too rapidly the you housings could maybe crack. Maybe

[@wbass243]

@@arcadiagreen150 I imagine an easy way around that would be to use a material that "releases heat" or contracts faster than all the other parts. Lets say Iron and aluminum both swell a few thousands together but one will contract faster than the other... Just make the dowels out of "that" material so the irons cant contract while the dowel is still expanded. That's my thought.

[@shadywhisper8455]

Aluminum expands more and faster than iron, so as far as the engine heating up (specifically the dowels), it's good. The only issue would be in cold temperatures where the aluminum would contact more than the dowels, but that won't be an issue given the conditions the engine will be run. Edit - thought it over again, and you could be right. As the engine cools down after a run or whatever, the dowel might stay expanded and hold that heat longer than the aluminum, so the faster cooling aluminum might be stressed by contracting onto the expanded dowel... Oh well, we'll find out soon enough. Rob's the king of learning what you can and can't do the hard way, that's why we love him haha

[@zanny7011]

@@arcadiagreen150 I’m not talking about the dowels expanding, I’m talking about the aluminum housings needing more expansion give than the iron plates,

[@arcadiagreen150]

@@zanny7011 that's what I was getting at aswell. Also my spelling was terrible. And I meant to type in my previous reply "I get where you are coming from". I'm dead tired from work and my reply was a cluster fuck

[@sarj2836]

This man is a legend of rotary motors.

[@LeathermanSoftwash]

Watching rob stick his rod in all the perfect holes is oddly satisfying

[@drewwrobel564]

Too bad your still not in Michigan, you convinced me to make my "Forza" car. I'da loved for you to see her.

[@nopes1776]

Not that cali is any better who who the hell wants to be here either? G.r.

[@AdamofSpades217]

As a engineer, racer, and machinist, I could ~feel~ the fit of the dowels wheel you slid them into the housings. Great video.

[@McShrimp]

Reeeeeetarrrrdddddd

[@sporadiceel6246]

This makes me want to pull a junkyard 6 port Renesis and rebuild it. Count on Rob to give us dangerous amounts of confidence!

[@thesharpshooterking9963]

im sitting here watching this and i dont think i will every get over how pleased he is with his work and the code on a CNC machine and how tight he was able to get his tolerances just the absolute joy. love watching this

[@jordanE1451]

It's so cool to see the transformation from when I first started watching the channel to now. From basic knowledge to machining your own engines.

[@Ragnaraz690]

The progression is amazing. It's been a joy to watch your learning and knowledge building to the point you can now debunk all these tuner "secret sauce for ££££" BS and actually tell people what works and what you actually need. Respect dude!

[@robroten6446]

Nice work, Rob! All of the machinists I've been around keep an air hose hanging by the door. Open the door, blow everything off. Remove piece. Blast again. Insert new piece, go. It's like reflex with these guys.

[@PenumbralFigure]

I am literally living vicariously through you Rob. Earlier this week i was thinking about how you would set up a jig to repeatably machine the stock bolt holes to make them dowel bolts aaaand here we are! Lol. Indexing off the stock dowel locations should be perfect since they are a press fit, tolerances will be nicely repeatable and accurate no matter what housings you throw in the machine. Keep up the insane work man, i can't wait to get my hands on my own rotary one of these days.

[@PenumbralFigure]

Wrote this comment at about the 10 minute mark, just hit 14:51 where you explain the second housing was within a half thou of the first. Fucking beautiful lol

[@Jay-nk6dm]

Ive been watching this channel for years and that ending still fucked me up haha

[@tacticalcheerio]

Hey Rob, you may be able to use a "lollipop" endmill with some 3D programming to get into the intake ports depending on how steep of an angle you are after... also have you considered getting into land speed? Maybe get into a record book. 😉

[@peterfrancisco9363]

Rob dahm you have a lot to answer for. I have no background with cars I am a carpenter by trade and because of your videos I now have a shell of a car that I stripped and 13b on the floor next to it waiting to be rebuilt. Some days I really enjoy what I'm doing and some days I blame you for everything. Keep up the good work your videos have inspired me to build something that one day I will be super proud of

[@KiterTMK]

I shared this in our Renesis Rebuilders facebook group of 4800 members, dedicated to rebuilding our 13B-MSP's. Love the videos! The outer seal piano play made me hurt and laugh at the same time tho :D (just run laps with your finger over it, it should all settle nicely after the 3rd Lap). We'd love to see more of the builds, do's and don'ts, and feel free to stop by and say hi!

[@GreddyS14]

Some say he’s still chasing that gasket hump to this day

[@LifeofMarcus]

LOL

[@lilboi630]

34 minutes of daddy dahm, yes!

[@paulhouben6539]

Rob is obviously on his way to custom.making his own CNC 4 rotors. Love your passion! Keep it up! So awesome how your spreading the knowledge you've gained over so many years. Keep the rotaries alive!

[@mattedwards4164]

The passion and enthusiasm this man has is infectious, the mad scientist loves life.

[@mk3_jcb229]

Back with another banger!

[@mikoballet6149]

Yooo, love the content!! Just want more!!!

[@JoeHatesItHere]

The edging joke in the middle of the video set me up for the ending of the video...well played.

[@MrYlijumala]

I started 3D printing this summer. Got some machines and some resin. Never done any 3D modeling but yesterday I tested my first RC car wheel which I did all by myself because the "OEM" wheels were breaking under hard use. First test was perfect. The wheel did not break even under full speed of 85km/h. Needs couple of tweaks still but I feel kinda the same happiness rob does in this video. Just amazed I can do something better than factory

[@Brother2Jis_27s4]

Yeah buddy 🤙 you be killing it Sir Rob👏seriously, a year ago I bet you didn't see yourself at the level your at now. Keep it up boss👍🤘✌If you ever need a legit auto tech I'd love to help you push it to a higher level....

[@matthewrourke9742]

I miss the days when I was still catching up on Robs channel and I could binge watch. Waiting for new ones sucks!

[@BioExtract]

I love how happy he is about every step. It's contagious.

[@lanedj801]

Soo satisfying to see a buttery smooth assembly.

[@yalkhazali71]

6 rotor in the Indycar?

[@asahart2489]

I don’t think so. It seems like it would be too big

[@thirdgenfreak25]

Keep it up

[@jaybirdls1]

Manufacturing Engineer here. Watching those dowels go in so easily is very satisfying 🤤 If you’re looking to improve any of that position tolerance, feed onto the hole center line of every hole from the same direction every time. Meaning, start .250” positive in X and Y, then feed to position. Do that when drilling and reaming to ensure any possible slack in the ball screws is not fighting you.

[@andrewable2634]

It's so satisfying how every dowel just slides into place

[@waybous]

The proper torque specification is 5 ugga duggas.

[@JustFappIn]

*slaps iron on* dont do that

[@granddaddykeif]

I love that Rob posts long videos. So many youtubers keep their shit under 20 min and it sucks. If Rob and other car guys would make a channel to just have hour long uncut shit I'd watch all day man.

[@closeenoughmicron]

Quality video Rob. The dowels fitting in so nicely like that is so satisfying. Made me miss working in a cnc machine shop just for that.

[@ashishpatel350]

Anyone ever do titanium rotors?

[@maaduece5132]

I don't think so , billet alloy rotors aren't even a thing. Not sure why with what some of the machines are capable of these days

[@ashishpatel350]

@@maaduece5132 yeah your think rotating mass would want to be as light as possible.

[@McShrimp]

Tardorifardo

[@lexus_offroad_adventures]

Partner with Demolition Ranch to see if it’s actually bulletproof

[@xploration1437]

No

[@lexus_offroad_adventures]

@@xploration1437 explain yourself

[@xploration1437]

@@lexus_offroad_adventures That’s for children.

[@nick_bag]

it's really crazy realizing how far you've come in the past couple years, really proud of you!

[@IDLExHANDS]

Your videos are very informative. Gives me plenty of ideas of how to upgrade++ stock parts. Always enjoyable!

[@mojo284]

Always excited for new videos. Love the builds.

[@--_DJ_--]

Legend has it he is still chasing that gasket around trying to get it to seat.

[@aryaan8754]

Never miss rob's video 🙌

[@mtech1961]

Rob these Videos are inspirational, how much you have learned and passed that knowledge on. Kudos dude

[@LilFoxAK]

damnnnn!!!! from paying people to build motors to just tearing em apart like nothing. the 10,000 hour rule is coming into effect. and its coming in exponentially. rob is gonna be so much. its just already written man. the guy has so much dedication and is so humble. fruits of hard work. super happy for you rob. dont stop now or ever. keep that freight train movin kiiiiid

[@smithjohn3080]

Good job 👏 on the fixture plate. Your machining knowledge is expanding. Cool to see

[@dareace9]

Ya know, I used to have a concern about not being able to figure out how to build or work on rotary engines as I want to get into them and buy a car with one or swap one into one, but you help me make sense of them, thanks Rob. 🙂

[@ThEASbO]

Rob playing the piano was epic

[@ChaosAura]

Been fun watching your progress as a machinist Rob, that's my full time job.

[@richardperrin9374]

I like that this is "on a budget"...cuz we all have CNC machines!

[@simonconvey9645]

Wow ! You've upped the ante now. Good to see that you are finish reaming and not just drilling. You could do *some* amount of CNC porting on just 3 axis using ball end mills and very well controlled tool paths. Great to see you move from bolting on parts to mods machining....

[@jasonjaeger4042]

Awesome to see someone take that much pride in their work. Most people complain. He needs to take a basic automotive class though, he never touched the pistons or valves.

[@tokag]

If only Mazda had you working with them... Japanese engineering is usually well refined, but your insight and ingenuity is next level.

[@1993kawasaki]

Rob, you are the new ROTARY science wizard!

[@danielsanden28]

So in love with this series!

[@tannerharcus8833]

These videos make me so inspired

[@bradgallo7158]

Dude you have some great skills. Love the videos and impressed at your high level of exacting work.

[@rx8tom]

Super cool stuff! Doweling is definitely on the list for my planned rew swap

[@mikepaul396]

thanks alot. great content. appreciate the effort to go over all these issues

[@iamchrisdammit]

4:04 those Milwaukee sockets are nice. The square end keeps them from rolling away. Real fancy!