Terrifyingly Fast 4 Rotor REVS with the Lightened Flywheel and 94mm Turbo

[@Clearlynotcalvin]

The content we were all waiting for! Thank you Rob and team for putting out 45 mins worth of beautiful RX7 content

[@rcanter]

Talk about being left with blue balls. Never before have I wished for one more minute. Can't wait to see him over on MrJWW's channel too.

[@JohnSmith-oh9ux]

lmao, beautiful yes, but all in all there is sweet fk all rx7 left, just few panels xD

[@mango-pm2xx]

the cut off at the end is such a classic xD

[@iamarawn]

Gets me every time. Halfway in a sentence it cuts off.

[@Clarky_AU]

Such a tease!

[@sirseven3]

Typical rob 😂

[@lorddoobsworth144]

probably to trigger the end of video ad to get more revenue

[@sirseven3]

@Lord Dooßsworth doubt rob is aiming for maximum monetary gains because ads are very limited compared to other content on KZbin and that for the most part is controlled by the content creator

[@AngryMonkeyza]

What I love is that no matter how insane the motor already is, you're always looking for more ways to improve it and make it even better.

[@vikeskie]

he has to if he wants it to be even remotely reliable

[@RChero1010]

And ways to leave us with blue balls in the end!

[@rotaryperfection]

Isaiah is 100% spot on. A perfectly clean surface is how you get a rotary oil pan to never leak, including the factory sheet metal pans.

[@princecuddle]

well it's not just being 100% clean you also need near perfect flatness. the flatter both mating surfaces are the better they will seal.

[@masdto]

Man.... after all these years I think I never had one of your videos where I felt like a a door has been shut right on my face so hard like this one. waiting for the dyno and race!!

[@RENO_K]

Look at his Instagram for the Dyno sesh

[@davidshaw164]

I don’t think rob could make a boring video if he tried!

[@skyler9988]

It's everyone's attention to detail and thoroughness that makes these videos very interesting

[@davidshaw164]

@@skyler9988 yea, I feel like someone could learn more in a couple videos than a semester in some mechanical engineering school… lol.

[@princecuddle]

nah i think we just addicted to doritoes

[@yyfreak1637]

Just peeking into his shop through a camera makes me drool

[@aztharz5637]

It's crazy how much you have learned. I remember when you first got into tuning, now you machine your own parts, etc. Awesome

[@rachmatdwiputramat2683]

👍👍👍👍👍

[@jj-hf8jy]

Keep in mind the r33 and r34 attesa systems were designed to keep 30 psi base pressure at all times to aid faster reaction time

[@andrewd4626]

With 1/4th the HP lol

[@giant23]

@@big_gifts I already have a gym membership I don't need more exercise thanks!

[@lucaskelly4590]

@@giant23 did you hear new Chevy's come with a hitch seat? It's for when you take a break from pushing it home.

[@戴紀煬]

@@big_gifts It's definitely a scambot

[@戴紀煬]

It's similar to preload on a LSD, right?

[@aaronbyard2051]

i love that rob and the team push products so far that he is basically an extention of r&d departments for multiple companies

[@tkskagen]

Isaiah is the reason that you have such quality builds... Major "PROPS" for Isaiah!

[@DrAppleCrispies]

Dare I say the most advanced rx7 ever built? This things going to be amphibious pretty soon! Really enjoyed the awd demonstration, really is out of this world.

[@rickcupola6262]

Those turbo and exhaust manifold look clean after that metal magic coating, and that engine running in the end was the cherry on top. I didn't even know that the ATTESA-ETS operated at such high pressures. Also, that second SEMA interview with Andre from HP Academy was very informative. Will there be a podcast in the works in the future?

[@desmo78]

Attesa? Isnt that nissan awd or im going crazy?

[@barra245t2]

@@desmo78 that's correct,rob runs the system to control the front/rear drive bias

[@SaulHeno]

@@barra245t2 alongside an E36 rear diff turned upside down for the front. Shits crazy

[@EricFixalot]

Bots going crazy on this comment

[@brennanthewizard9252]

@@desmo78it is

[@ScarlettStunningSpace]

Seems like the Indycar is inspiring you into how you're building the 4-rotor. That's a win in my book!

[@mannnygz]

budget f1 inspiration lol

[@RubyRedTaco]

Rob those K-type thermocouples are not resistance type temp sensors, those would be RTD's. You can change the lenth of the wires without affecting the readings. The most important part is making sure you have the right conductors from start to finish, like you mentioned, the alumel and chromel pins.

[@Rikitiki09]

I think the exhaust is so beautiful that it belongs in a museum.

[@wags9777]

I've seen the 4 rotor on a few other channels videos. I can't wait to see all the fun stuff coming soon.

[@Vrod80439]

As someone in Military aviation, the comment about the putting the keyway down on the steering quick release was triggering. We always put the main key up. I love seeing someone so fascinated with milspec connectors, that's been my life for over a decade now, so I forget that it really is quite special in the electrical world.

[@julioburgos4979]

Rob, I can't thank you enough for inspiring me to really understand all of the components of my projects. Sometimes we fear wiring or new technology but watching these videos I see the importance of knowledge in all things. Thanks man. Your team ROCKS!!!!!

[@aserta]

If you machine the oil pan, make it out of a thick slab of aluminium, and make the bottom look like a lattice so that it gives mahoosive rigidity at just a slightly bigger weight penalty. The lattice will also cool the pan better as they'll catch air (if you pass it through the engine bay and have an exit port down under).

[@dylanzrim3635]

That creates drag

[@RChero1010]

The amount of surface area available just by machining fins onto the oil sump plate would contribute a little bit to the oil cooling, but you do realize they have actual oil cooling heat exchangers mounted behind the bumper, right? They've shown them dozens of times. I'm honestly more surprised they don't have a thermostat to close one or both of the coolers when the oil's not warm enough with how much cooling they have (maybe they even have added a thermostat for the oil and I don't remember). Also to Dylan's point, the drag can be reduced with efficient ducting but yes, this would affect the aero performance. The entire vehicle has a flat bottom for a number of reasons and disrupting that too much defeats the benefits.

[@kasuraga]

@@RChero1010 oh wow no t-stats on the oil cooler? When i was planning on putting an external cooler on my car everything I read said you absolutely should put a tstat on it if you want your oil to stay at optimal temp more reliably and reduce warm up times.

[@lucaskelly4590]

The oil pan doesn't actually store any oil on this so temps shouldn't be an issue. Dry sump

[@frodo4087]

@@kasuraga in my opinion they definetely have a oil temp read but they probably just didnt put it in any of the videos. they have individual exhaust temps so it wouldnt make sense for them not to have a oil tstat

[@michaelfarris1639]

Mazda needs this guy for future rotors

[@colinwallace5286]

Mind-boggling how compact that engine is, considering the potential output. Very nice…😎😳😯

[@DaftFader]

The quick releace, without the steering wheel attached, but with the flappy paddle shifters on looks like you've got the bat-mobile steering wheel/yolk in your hands xD.

[@aserta]

You could pass the wires that go close to the hot zones pass through a tube in tube heat separator. NASA had a very similar thing for some of their heat probes. I don't know what the metal was, might've been anything from aluminium to inconel, but what i do know is that the tubes were separated by ceramic spacers. If you can find some ceramic rings (pretty common in various electronic applications, so you could even ask for a free sample from a manufacturer and get enough to make a few tubes) you could then either machine or find tubes that fit the specs. Mind you, the tube separator (altho not as elaborate) is as old as cars are. If you look at various antique ICE vehicles from the era, you'll see the tubes.

[@dylanzrim3635]

How long ago did nasa do it? Probably just a Kevlar tube like what’s commercially available now.

[@smooothyyy]

What a gorgeous machine! I hope you will never crash this one of a kind

[@rockovincetti4869]

These long videos are so fire bruh no cap what a goat

[@zachr369]

Good information for the silicone sealants, they are aerobic sealants (dry with lack of oxygen) any contaminants can compromise the seal. So just like tig welding the cleaner the surfaces the better. I also only get my tip 1/2 inch in, it’s all I got.

[@rsett4964]

"Anaerobic"

[@threadtapwhisperer5136]

@@rsett4964 aerobic sealeants wear 1980's latex and sweat to the oldies. Anaerobic=sets with no air/oxygen Aerobic=sets in regular atmosphere. Ultra grey ed/copper permatex for all the sealed things! Oh and get ya a carbide tipped gasket scraper. Oreilly auto sells them. Itll change your life.

[@TateRedLeaf]

I’ve just gotta say. Rob you’re incredible, but Isaiah is the reason this car will be next level. His skill and attention to detail sets him apart from most other Fab guys.

[@brunobossio2388]

This thing is going to age like fine wine. Good for you guys and all the hard work. Next videos should be absolutely epic !!!

[@colinwallace5286]

Okay, that variable torque system up from will be awesome. The low setting where you essentially cancel out “ambient” understeer will make that car so easy to drive, with the front end feeling a lot more secure.

[@MattyEngland]

Wow, that exhaust is a thing of beauty.

[@AngieMeadKing]

I love all the information in this video!

[@johnbroge7839]

I've been thinking that between the 3 and 4 rotor, the 3 rotor is the best running, best HP/rotor. I like the theory on the new turbo for the 4 rotor. Thanks for bringing the vacuum regulation to light. Love the steering wheel. Can't wait to see what the 4 rotor does now!

[@Sir.VicsMasher]

Its nice to see a KZbinr make the investment into high temp coatings.

[@BigDonk420]

Rob Dahm the rotary guy. Giving me some Bill Nye the science guy vibes. Thanks Rob I feel like I’m learning something new every video.

[@lilxberthi1816]

I love the videos rob your one of the main reasons I'm into cars and why I love the rotary. I watch your videos as soon as they come up and I'm checking everyday for an upload. Love you rob keep the videos up they are great

[@TheIrishPhantom]

The EGT thermocouples look just like the ones used in industrial plants/refineries. Same connectors, compression fitting and all. That's when you know you're making power lol

[@witchp1]

Love how the shops turning around, lots of room for activities!

[@shred1894]

That classic Rob Dahm ending tho...

[@andrewgacree]

Already got my hoodie, t-shirt, and poster. Thanks again guys! Keep it up!

[@timsmith618]

God damn, that sounds amazing. Classic Dahm ending too.

[@AndyMac508]

I like when I get lit, go get snacks and come back to find a new rob dahm video.

[@MattyEngland]

Even better if it happens to be 4.20pm when it drops.

[@spazzologist]

Holy spooly boys😻 that 94mm upgrade is tooooooo good

[@apocalypse94]

AAAAH been getting teasers on boostedboiz and adam LZ channel, and im so looking forward to the big episode.

[@bobbyj045]

I'm amazed at the level he's taken this car, the channel, his peers. 👏

[@brennanthewizard9252]

Love how Rob Dahm videos always abruptly end it’s fantastic. Fucking masterpiece

[@Mile-long-list]

Sounds so rowdy ! Let's hope she stays in together and you can shred Roberto Spaghettio into fine ground parmesan.

[@verifiedtext]

Thanks for responding ✅✅✅✅✅✅ You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁 Dm to claim your prize 🔝🔝🔝🔝🔝🔝

[@Killerboy0428]

Btw if you lock one of the wheels like that . The diff acts like a Gear Box that would allow one wheel to spin twice as fast as both wheels unlocked would have turned. Meaning the torque values you see need to be doubled :)

[@beaueginton6382]

You were extremely lucky making the retaining "C" clip out of welding wire, I'm surprised it worked. I had a bad experience when I reused the stock retaining clip on my old FWD car. The part was out of stock locally and I was eager to get back behind the wheel. My CV axle ended up popping out of the transmission and egg-shaping the spline. I thought I lost a gear (which has happened to me before) until I tried up-shifting. The transmission wouldn't engage in any gear so I knew then it wasn't a simple roadside fix. I ended up having the car towed from Reseda to the El Monte area where I lived at the time. It led to me spending thousands on replacement parts and labor. I attempted to do the repairs myself but had issues cracking open the transmission case. I wish I had access to the factory service manual at that time. My impatience and ignorance led to a costly repair and over a month of downtime. I later replaced that car with my RWD 13b MSP RX-8 which is my track only. It gets expensive running idemitsu premix and race fuel for a daily driver, I get less gas mileage than a modern-day V-8.

[@tonym5661]

The thermocouple generates a voltage based on temperature. Not a varying resistance. This is is why it's hard to extend Them. If you connect it to a copper Cable it is actually a second temperature sensor at the connection point. Because two different metals connected to eachother generate a voltage based on temperature. Kind of like a battery.

[@anthonymodica7067]

Finally a post from daddy dahm, been checking daily for weeks it seems!

[@verifiedtext]

Thanks for responding ✅✅✅✅✅✅ You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁 Dm to claim your prize 🔝🔝🔝🔝🔝🔝

[@IceManFab94]

Yess Rob! I've been fiending for your content this whole week! I got to see sneak peaks and it was like giving a taste to an addict

[@frankotto83]

I really love/hate your kind of cliffhanger at the end of every Video!😅🤣🤣

[@CenPapi]

Man, the last few episodes had some slaps, whoever is editing, keep up the jams.

[@feenyx6394]

Oh my god, these outros will be the death of me! Love everything else (but secretly love the outros too)

[@jasonveto2320]

The beginning of this video is the pickiest I've ever seen our boy about mating. Pretending like he doesn't get down with dirty "surfaces".

[@tp7886]

I bent a piece of wire coat hanger into a retaining spring for my throw out bearing and it held for two years. Well done using some welding wire and making it work.

[@pipisugbo]

Joel's montages killing it 😁

[@exemch4826]

Rob you are such an inspiration! Love all your and Isaiahs work!

[@3rd-Eden]

Have fun @ Banging Gears!

[@isaacraymond8610]

Thanks for the merch rob & crew :)

[@mmavcanuck]

Glad to see you end this video properly. I was worried after the last one.

[@Yaimdan]

that ending is such classic rob dahm lmfao. 4 rotor sounds amazing ugh

[@joshnuez3371]

Worth the wait! This is my perfect valentines gift 😜👌

[@mitchelldalton7405]

Hey Rob, for your EGTs, take a heat gun and do each run to calibrate, you can plug those into either the ECU and get a reading or you can plug the sensor into a multimeter with a temp indicator, that way you can tune them perfectly! Anyways love the content! Keep it up!

[@Birb_of_Judge]

Just the first few seconds were eargasmic Also rob, why? I need sleep, I've gotta be at work in 7 hours and i can't not watch this 💀

[@goodwoodjohnson1692]

Make that exhaust fender out of titanium... the heat from the exhaust may give it an awesome color. Thanks for the videos!

[@JoseGarcia-yl1dg]

I thought those connectors were a mini SpongeBob for a sec 13:45

[@maxideath01]

God damnit rob! I thought youtube was messing with me at „so imma take it around the block“ but then i realized who im watching and im hyped for the next vid

[@donovanmccray6274]

It was so dope to here the car sing at Lime Rock park, hope you come back

[@Poizdrc]

Correct me if im wrong but on thermocouples the 2 dissimilar metals are only on the end where its reading the temps from. I use these on injection molding machines daily and we cut them to length regularly as long as the material removed is from the plug end of the sensor.

[@devianjones2539]

Damn you I wanna see the around the block part lol always excited for the next video

[@Crisheight]

I love that when it died it gave us one last lil fireball of love, unlike the video editor who cut us off all cold like ;)

[@DoU3vnLftBr0]

Joel is getting really good at being around the shop out of the way catching you guys in action

[@Izanami2442]

Bobby Dahm back at it with a BANGER

[@dynamitedavies]

I've used stainless welding wire to replace the clips on Bosch EV jpt connectors. Works a treat

[@senorjalapeno3937]

Jesus.... watching this video made me realize what I do with my own car is nothing compared but a hobby to the professional and above beyond art you guys make in that shop. Bravo.

[@LouieLouie702]

5:53 Rotaries, Turbos, Driveshafts and UFC. Mans World.

[@lovelldreams2498]

knowing the videos probably make no justice to the true sound of this beast breaks my heart man

[@ProModsPerformance]

With the dual brushless pumps, be mindful of backflow through the pumps if you're staging them, or not matching their flow at all times; many of the brushless bumps like the Ti ELM don't have an internal check valve, so when using multiple you either need to manually check valve their output, or be careful with the control strategy.

[@troydority265]

Those posters are so cool!

[@batuhanturkal4795]

that beast sounds like a 767b with the new flywheel what a sweet sound

[@mpboi21]

Hoodie was delivered super quick, and gives my Nike and Under Armour hoodies a run for the money!

[@srt8u]

That poster is sick, had to pause video and buy one!

[@huszaratraktor]

I really thought I get used to these endings - but damn this one caught me off guard

[@nathanpotter1334]

Thank you Rob

[@verifiedtext]

Thanks for responding ✅✅✅✅✅✅ You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁 Dm to claim your prize 🔝🔝🔝🔝🔝🔝

[@UncleManuel]

Now THAT was a classic Dahm move at the end. Thanks! 🤪😂😁😇🤟 I can't wait until this beast finally can unleash its full potential. Rob deserves to just drive his car(s) at full anger without worrying about things. And without a laptop in the passenger seat... ✌️

[@chinosi3398]

I love you rob, every day you inspire me to one day make my dream car

[@alxti]

45:36 the tiny little flame lol rx7 said "achoo"

[@travisstern5132]

I could have sworn the plug at 14:45 was Spongebob 😂

[@verifiedtext]

Thanks for responding ✅✅✅✅✅✅ You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁 Dm to claim your prize 🔝🔝🔝🔝🔝🔝

[@vicentemontiel9890]

I thought the same too. I was like.. Oh look sponge bob plug how cool. Wrong I was.

[@LawzyDog]

I wish you could bring it to cleetus and cars Indy so i could finally see it. So sick

[@chiko5810]

I was waiting for too long for this vid

[@verifiedtext]

Thanks for responding ✅✅✅✅✅✅ You’ve been selected for today’s giveaway exercise 🎁🎁🎁🎁🎁🎁🎁 Dm to claim your prize 🔝🔝🔝🔝🔝🔝

[@TOPHATVAMP]

It ok to talk to your engine its your baby .. steve Morris does the same the greatest engine builder in the world. im sure there are others, but this guy loves his engines to heart.

[@kr4906]

I call it the white glove treatment Isiah. Good maintenance practice

[@Rmx2011]

Holyy the RPMs picked up instantly.

[@darkwatcher01]

Exhaust flames about to melt the fender

[@vEAGLE5]

Screw you Rob for that cliff hanger xD By the way I received my hoodie, shirt, and poster! Great quality and such a bad ass poster! Thank you!

[@arielceballos8778]

Always excited to see Rob post a video! 😍

[@jasonbarron6164]

Look out rob dahm launching his journey into legend/guru of the four rotor turbo powerplant 👏

[@haukef4289]

Those temperature sensors for the exhaust seem to be thermocouples. If that is the case, the way you explained it is not quite correct. These are made by joining two different metals at the point you want to measure temperature. In this case the colour code fur US -yellow- would be nickle and chrome nickle. The resistance of these is not what is of importance. They put out a small voltage in the range of millivolts based on the temperature difference of the couple itself and the comparison point (in most cases some kind of evaluation device, e.g. the ecu). You use wires and connectors with the same electrical properties as the thermocouple to make sure the voltage doesnt get manipulated too much by the wire connection. They get used a lot in high temperature applications because they can withstand that much better than PT sensors or other resistance changing sensors. Hope that helped a little bit and sry for spelling errors, I'm not a native english speaker.

[@Kenneth-oh5tf]

I just wanna make a reliable 2 rotor for my rx8 and you’ve built this beautiful masterpiece of an rx7 😭 I hope she runs good rob!!