I've been lusting for a FD RX7 for such a long time, now suddenly a bunch of random coincidences make it pop up in normal conversations and day to day, and now THIS video. I think the universe is telling me to go for it 😅
I agree the FD is a beautiful car, but they are so problematic. My friend has had one for 25 years or so, seems like that thing is broken more than it runs... But it's a beautiful sage green color
@@HaHaThatIsFunny I think its one of those cars you really have to be in love with to be a longtime owner. I romantize car ownership just enough to be willing to deal with it
I read MotoIQ for many years before I discovered Rob, and I've been waiting for this moment for exactly this reason ^^ The desire to *know* is so strong in Mike and Rob both, as well as wanting to educate others. It's a great match, and I look forward to seeing both builders benefit down the line!
These 2 are so great together- Humble, SO willing to share their knowledge, and are in it for US. I’m going to their stores, and will proudly wear their merch. Its the least I can do. So much great info shared. My first car was a 73 Rx2, and I put a street ported 12A into it (Side draft DeLorto, Header, 1st gen electronic ign, etc), with a gen 1 Rx7 5 sped, and a GSL limited slip (direct bolt in for the Rx2), and CRUSHED 5.0 Mustangs and Camaro’s of the day, stop light to stop light. You would not believe how many guys pulled up next to me, PISSED, asking ‘what is in that thing?’, and my reply was always ‘1.2 liter’s of fury.’ Not to be obvious, but I wish I had that car today…. SO fun. Today, I could afford to have Rob build me a monster, but, if that car had 300hp, you’d struggle to drive it. More collaborations, between these channel’s, PLEASE.
Man, I feel so lucky having watched Rob go from someone who was kinda laughed at for having unreliable 0PSI cars to the absolute mad scientist he is today. Such a glow up!
29:08 - you know Rob has this clipped and plays it when he wakes up in the morning for inspiration. Imagine getting to a point in your nerd hobby where youre not only making a living from it but realize youre a peer of an engine master and have valuable insight to share
@@Leo9ine Rob is a drug dealer, he is not an engineer, certified mechanic or a trusted engine builder... in fact his engines are infamous for blowing up. Stay in school and stay away from drugs and losers like Rob Dahm.
I've been following robs rotary journey for some time now. We need guys like these two teaching automotive classes in high school man. They're so knowledgeable
I 100% agree with Rob on the 90psi numbers. That's what I've always gotten with a piston engine tester on ALL my basic rotary rebuilds at 2,700ft above sea level.
This is easily the most informative and fascinating discourse to date on the rotary engine, by 2 data and technical oriented geniuses. I couldn't stop the video for a second. I learned so much. Thanks 🙏
I just love the guy who started a channel knowing absolutely nothing about cars has not only become one of the great wealths of knowledge for the dorito that we all agree that he is the guy to speak to
Awesome video guys! Would be great to see you both do a 13B project build for the average Joe that want's to run a nice and reliable 450 to 500hp rotary!
I used to pick up fbs and fcs from the police impound for under 1K. My first was a brown 79 FB I got for $150. I was offered 1K in the lot as soon as the buyers heard it start. At one point I had at least 3 in my yard at one time cause no one wanted them. Back then we didn't know about premixing.
Love those rotaries. My friend has a 76 RX3 with a mild bridge port and Racing beat header and exhaust. Nice FC parked in the background. Looks like a Turbo II. Always great videos👍Keep em coming.
I like the idea suggested about doing thermal coatings on the combustion faces of the rotors, never seen it done before.. that way the rotor and the oil doesn't get so much heat transferred into them.
I wonder, with the overlap between intake and exhaust port would a rotary benefit from a resonance exhaust pipe like a 2-stroke engine? wouldn't that fix some of the 15% loss of port timing and injection period?
Was there a problem with audio on this recording? It’s has a bit of an echo and makes it difficult to listen to which is unfortunate because I’m super interested in this video and excited to see more collaborations in the future!
it's the dual lav mics... Rob's mic will pick him up talking and then milliseconds later the sound will go into Mike's mic creating a little echo effect. not the ideal recording setup but we don't normally shoot multi-speaker vids.
Loved this, some great info in there. How does one calculate injection start time for secondary injectors to account for the time it take for the fuel to get down the runner and into the combustion chamber and how that will vary with both rpm and boost. Especially if one can’t trust the O2 sensor
The discussion around turbocharging efficiency has me wondering how effectively an F1-style turbo/MGU-H could be effectively integrated into a rotary/hybrid build to recover excess energy from the exhaust once it hits boost
UA-cam might not allow links, but there's a thread on rx7club named '#1 Rotary Problem Fix' by Barry Bordes. He discusses that Mazda made some sacrifices to the coolant passages near the spark plugs in an effort to improve combustion efficiency, and how the passages can be modified to help address that.
The word tribology derives from the Greek root τριβ- of the verb τρίβω, tribo, "I rub" in classic Greek, and the suffix -logy from -λογία, -logia "study of", "knowledge of". Peter Jost coined the word in 1966, in the eponymous report which highlighted the cost of friction, wear and corrosion to the UK economy.
Does anyone know what the red tool box brand/model is in the background? I've been looking for something with shallow drawers like that forever, and it looks perfect.
@@motoiq I guess knowing the overlap percentage you can calculate the fuel requirements and if running ethanol the extra fuel on overlap will help cool the rotor face too
Cool video. I must agree with 99% of the content 👌🏻. Only about the nitriding I must say it aint that hard to properly nitride them and on a PP NA engine for circuit use the side housing wear (and side seals) is actually the only wear when running ceramic tip seals. For putting the dowel between the spark plugs how would one notice the flex there leading to a real issue?
From what i found online it seems like uneven apex seal wear, chatter, or even total failure but only becomes an issue for turbo charged engines at like 17-20 psi of boost (400-450 hp-ish)
Hmm ok. What always wondered me is that the housing is alu and the side plates are cast iron so lets say from cold to hot there is about 80K temperature delta which will make the alu grow quite a bit more then the cast iron. W the 2 factory dowels the rotor housing can expand rather freely but the more dowels one adds the more restricted it would become. Maybe this is no issue at all. To machine them in the housing I would assume one can just helix mill the holes in the side plates and would use a drill followed by a reamer to make the holes in the rotor housings. Or what is the proven way to do it?
@@RubTdi Just fyi, I am not an expert. Just did some research because you made me curious but... the rotor housings have a steel liner on the inside that the aluminum is then cast around and there is a constant flow of coolant through the aluminum part of the housing and the outside of the side plates. I think the coolant distributes the heat evenly enough that it doesn't become a big issue. Also most of the heat is concentrated in the combustion section (where the spark plugs are, hence the warping issues) and gets absorbed up by the rotor which is oil cooled on the inside as well as the water jacket. Basically the steel parts take most of the heat so the aluminum doesn't expand that much more than the steel That's my best guess anyway, I could be entirely wrong, and when it comes to machining I have no clue
The Rotary subculture reminds me of the Flathead Ford cultists. The engine has been tried and found wanting but there are still passionate adherents. It's a strange world.
It is a flawed and inefficient engine that has the mpg of a v8 but power of a v6. It's maintennance schedule includes a complete rebuild. The only thing it offers is a lower centre of mass and output for its physical size. Those that think a rotary engine is an engineering marvel are mislead and misguided. Then there are those that are truly delusional that will try and refine a flawed design and chase perfection, and justify it. But hey, Some people dance Some people sing Some like cats Some collect pokemon. You love what you love. I have an RX8. And i love it.
Theres a guy in Alberta that has a 3 rotor mid engine kit car, looks almost like a stretched out Cayman, really cool, forget what the car is called tho.
Tuners just like builders have different ways to make power, and if you get the wrong combination, or a different driver and different input style. things happen.
Long story short, Mazda just doubled the price of crate motors 😭Just in time to curb my enthusiasm for a potential engine swap that would be baller...might have to wait a while. sigh...
These 2 guy have the combined knowledge of Thanos, I feel like when they are together their combined power could compare to the infinity gauntlet with all the power stones😂
Let me walk you through the Donnelly nut spacing and crack system rim-riding rip configuration. Using a field of half-C sprats, and brass-fitted nickel slits, our bracketed caps, and splay-flexed brace columns vent dampers to dampening hatch depths of one half meter from the damper crown to the spurve plinths. That's primarily what supplies the go-force through the triangulated hexagonal viscous hatch ampler.
rob show me were does all that fuel compression go into the next chamber past a 2mm apex vs 14mm hole you rob have leaky engine vs a piston engine with no leak
I dont even have a car w/ a rotary but im still gonna watch this vid as if im gonna be tested over this info
I watch all motohq videos like that aswell haha, I mostly came to let everyone know Rob is obviously on stimulants haha
Same
Man i was getting ready for bed
😂
You mean ready for beddy
Mute the volume and with auto generated captions and a nice zoomed ratio screen I doze off
Fr
Me 2😢......😊
After so many years, Rob finally reveals his apex seals of choice.
I immediately wrote that down, in case this video gets lost.
Again though, his choice specific to his application.
@@noname-sd5dt for a street car with maybe some light track work, which is what 99% of rotary owners use their cars for nowadays
Time stamp?
@@aarons1350 13:51
I've been lusting for a FD RX7 for such a long time, now suddenly a bunch of random coincidences make it pop up in normal conversations and day to day, and now THIS video. I think the universe is telling me to go for it 😅
Get an rx8
@@noir-kx8ku I would, but the FD being one of the most beautiful cars ever constructed is part of the selling point for me 🤷
I agree the FD is a beautiful car, but they are so problematic. My friend has had one for 25 years or so, seems like that thing is broken more than it runs... But it's a beautiful sage green color
@@HaHaThatIsFunny I think its one of those cars you really have to be in love with to be a longtime owner. I romantize car ownership just enough to be willing to deal with it
@@jakedougherty6000 just make sure you've got a daily driver and it's your weekend car and you'll probably be very happy
Holy shit. I've never seen anyone but Rob match your absolute nerd energy about the specifics of motors! This is fucking awesome!
I read MotoIQ for many years before I discovered Rob, and I've been waiting for this moment for exactly this reason ^^
The desire to *know* is so strong in Mike and Rob both, as well as wanting to educate others. It's a great match, and I look forward to seeing both builders benefit down the line!
Nah, thats just Robs substance abuse problem... dudes a total crackhead.
These 2 are so great together- Humble, SO willing to share their knowledge, and are in it for US. I’m going to their stores, and will proudly wear their merch. Its the least I can do. So much great info shared. My first car was a 73 Rx2, and I put a street ported 12A into it (Side draft DeLorto, Header, 1st gen electronic ign, etc), with a gen 1 Rx7 5 sped, and a GSL limited slip (direct bolt in for the Rx2), and CRUSHED 5.0 Mustangs and Camaro’s of the day, stop light to stop light. You would not believe how many guys pulled up next to me, PISSED, asking ‘what is in that thing?’, and my reply was always ‘1.2 liter’s of fury.’ Not to be obvious, but I wish I had that car today…. SO fun. Today, I could afford to have Rob build me a monster, but, if that car had 300hp, you’d struggle to drive it. More collaborations, between these channel’s, PLEASE.
Do it. Support Rob and get a customer build!
Man, I feel so lucky having watched Rob go from someone who was kinda laughed at for having unreliable 0PSI cars to the absolute mad scientist he is today. Such a glow up!
This means more to me than you know. It’s so weird to look back. Honored it’s gotten to this point
So good to watch rob become a engineer - through trial error failure adaption and LISTENING but not believing other engineers!
A clear minded thinker!
29:08 - you know Rob has this clipped and plays it when he wakes up in the morning for inspiration. Imagine getting to a point in your nerd hobby where youre not only making a living from it but realize youre a peer of an engine master and have valuable insight to share
Rob Dahm is the guy that posted a video high out of his f'n mind bestowing the vitues of mixing of Adderall and Coke for recreational use
@@DoktorBayerischeMotorenWerke I need a link to that video
@@scotty305 Are you kidding? UA-cam blocked that video a long time ago!
@@DoktorBayerischeMotorenWerkeFrankly, someone who mixes adderall and coke is exactly the person I'd want teaching me to build a 700hp rotary
@@Leo9ine Rob is a drug dealer, he is not an engineer, certified mechanic or a trusted engine builder... in fact his engines are infamous for blowing up.
Stay in school and stay away from drugs and losers like Rob Dahm.
I've been following robs rotary journey for some time now. We need guys like these two teaching automotive classes in high school man. They're so knowledgeable
You have to be drug free to be a teacher
I think Rob is the man for rotaries and he is humble and not scared to share his adventures and tweaks he has found over the years.
When his not popping Adderall and sniffin coke!
Rob Dahm has a wealth of knowledge of Rotaries. He is Awesome at explaining his knowledge!! Tim Australia.
I 100% agree with Rob on the 90psi numbers. That's what I've always gotten with a piston engine tester on ALL my basic rotary rebuilds at 2,700ft above sea level.
I just love how quick Rob locks in after every laugh 😂🗿
Cocaine is a hellva drug
Rob dahm nerdery for an hour is the best thing on UA-cam. Watching him pack a rotor is so satisfying ! Please build one.
Perfect timing, I’m tearing apart a 13b I just got for my FD. Thank you for all the helpful info.
Two of my favorite techie nerdie car guys! Love that they are at Rob's shop as well where it is nothing but a dorito bakery
QUALITY CONTENT STAMP OF APPROVAL
No interest in rotary engines but that hour went so fast. Thanks Rob and Mike for the insights!
Prices of rx8s going up on Craigslist as I watch. Great education for potential rotary buyers.
The crossover event of the century
This is easily the most informative and fascinating discourse to date on the rotary engine, by 2 data and technical oriented geniuses. I couldn't stop the video for a second. I learned so much. Thanks 🙏
I just love the guy who started a channel knowing absolutely nothing about cars has not only become one of the great wealths of knowledge for the dorito that we all agree that he is the guy to speak to
Awesome video guys! Would be great to see you both do a 13B project build for the average Joe that want's to run a nice and reliable 450 to 500hp rotary!
THIS IS ONE OF THE VERY BEST ENGINE/ ENGINE THEORY VIDEOS I HAVE EVER SEEN, Thanks gentlemen!
I had a supercharged 12a fb RX7, and it was quick and fun. 300hp in a first gen was more than enough for smiles per gallon.
Love watching all Rob's videos and learning about rotors. So glad to have stubbled upon this! All of in knowledge on the table haha
I used to pick up fbs and fcs from the police impound for under 1K. My first was a brown 79 FB I got for $150. I was offered 1K in the lot as soon as the buyers heard it start. At one point I had at least 3 in my yard at one time cause no one wanted them. Back then we didn't know about premixing.
I could listen to both of you nerd out about this stuff for hours, thanks for the video!
Please do make a video about injection timing! Pretty sure that's the reason i heard knock a couple times now.
Dude rotary is my FAVORITE engine. Ik watching today because I didn't know these collab for a talk. I'm all ears for this.
Love those rotaries. My friend has a 76 RX3 with a mild bridge port and Racing beat header and exhaust. Nice FC parked in the background. Looks like a Turbo II. Always great videos👍Keep em coming.
It's 4 am right now on the dot this was my front page. Guess I'll suffer at work tomorrow.
Great !! Great video !! Appreciate it . Great tips and solid information.
this is amazing
esp loved the explanation of the overlap/fuel timing/lore abt having to run rotaries too rich
etc
Many, many, many, many, many thanks for sharing! I do not have rotary, but knowlage is great. cheers guys!
I like the idea suggested about doing thermal coatings on the combustion faces of the rotors, never seen it done before.. that way the rotor and the oil doesn't get so much heat transferred into them.
I have a fd3s. Sadly bad tuning ended the 2 rotor. One day I hope to get it back on the road.
Rob has enough humility that he will not call himself a rotary guru but damn.
These two make my love for knowledge even stronger
I wonder, with the overlap between intake and exhaust port would a rotary benefit from a resonance exhaust pipe like a 2-stroke engine? wouldn't that fix some of the 15% loss of port timing and injection period?
I thinks so and so does rob, the trouble is fitting it into a car.
Was there a problem with audio on this recording? It’s has a bit of an echo and makes it difficult to listen to which is unfortunate because I’m super interested in this video and excited to see more collaborations in the future!
it's the dual lav mics... Rob's mic will pick him up talking and then milliseconds later the sound will go into Mike's mic creating a little echo effect. not the ideal recording setup but we don't normally shoot multi-speaker vids.
Love this. So much knowledge between the two of you.
What about direct fuel injection or a combination of both port and direct fuel injection?
Loved this, some great info in there. How does one calculate injection start time for secondary injectors to account for the time it take for the fuel to get down the runner and into the combustion chamber and how that will vary with both rpm and boost. Especially if one can’t trust the O2 sensor
Would it be a good idea to msp treat the surface of the rotor housing?
The discussion around turbocharging efficiency has me wondering how effectively an F1-style turbo/MGU-H could be effectively integrated into a rotary/hybrid build to recover excess energy from the exhaust once it hits boost
Post rather pre-combustion chamber is what it sounds like.
I'm wondering if you could braze in fins within the coolant passages to help increase the thermal transfer from the housings to the coolant.
Some people machine fins in the passages on the combustion side as we talked about in the video.
UA-cam might not allow links, but there's a thread on rx7club named '#1 Rotary Problem Fix' by Barry Bordes. He discusses that Mazda made some sacrifices to the coolant passages near the spark plugs in an effort to improve combustion efficiency, and how the passages can be modified to help address that.
You tube allows links.
What about using a block off kit and a premix reservoir for the injector?
My old turbo fc ran 2mm rotary aviation seals on a very large street port. Seemed to work fine but I never pushed it that hard
I don't even have a rotary but this vid made me feel like I climbed the mountain and was granted an audience with sages.🙏🏾🙏🏾🙏🏾🙏🏾
Long live SPORT COMPACT CAR!!!! SCC :)
The word tribology derives from the Greek root τριβ- of the verb τρίβω, tribo, "I rub" in classic Greek, and the suffix -logy from -λογία, -logia "study of", "knowledge of". Peter Jost coined the word in 1966, in the eponymous report which highlighted the cost of friction, wear and corrosion to the UK economy.
Rotary swapped 2nd gen MR-2 using a kseries trans. I think this is the vision for my Mr2 now. Very expensive tho😊
From what type of materiel are made solid dowel ? C45 ?
I LOVE ROB DAHM!
Gold mine of information in here
Does anyone know what the red tool box brand/model is in the background? I've been looking for something with shallow drawers like that forever, and it looks perfect.
I think that's Teng Tools, Rob's channel had a sponsored unboxing video about it 2-3 years ago.
@@scotty305 Thanks!
I have a Nice day at school today if you ask me thanks Rob 😊
I friend of mine had a 79 rx7 with a non turbo rotary and he would put 2 stroke oil in the fuel and it would rev to 11k.
The giant pile of Garrett boxes on that top shelf is epic...
The port overlap is very interesting and made me think what rocket anti lag would be like on a rotary
Dosent need a rotary is like rocket antilag
@@motoiq I guess knowing the overlap percentage you can calculate the fuel requirements and if running ethanol the extra fuel on overlap will help cool the rotor face too
From Dade county Miami, we in the Chat😂🤣🤙🏾👏🏾👍🏾🇵🇷
Cool video. I must agree with 99% of the content 👌🏻. Only about the nitriding I must say it aint that hard to properly nitride them and on a PP NA engine for circuit use the side housing wear (and side seals) is actually the only wear when running ceramic tip seals. For putting the dowel between the spark plugs how would one notice the flex there leading to a real issue?
From what i found online it seems like uneven apex seal wear, chatter, or even total failure but only becomes an issue for turbo charged engines at like 17-20 psi of boost (400-450 hp-ish)
Hmm ok. What always wondered me is that the housing is alu and the side plates are cast iron so lets say from cold to hot there is about 80K temperature delta which will make the alu grow quite a bit more then the cast iron. W the 2 factory dowels the rotor housing can expand rather freely but the more dowels one adds the more restricted it would become. Maybe this is no issue at all. To machine them in the housing I would assume one can just helix mill the holes in the side plates and would use a drill followed by a reamer to make the holes in the rotor housings. Or what is the proven way to do it?
@@RubTdi Just fyi, I am not an expert. Just did some research because you made me curious but... the rotor housings have a steel liner on the inside that the aluminum is then cast around and there is a constant flow of coolant through the aluminum part of the housing and the outside of the side plates. I think the coolant distributes the heat evenly enough that it doesn't become a big issue.
Also most of the heat is concentrated in the combustion section (where the spark plugs are, hence the warping issues) and gets absorbed up by the rotor which is oil cooled on the inside as well as the water jacket.
Basically the steel parts take most of the heat so the aluminum doesn't expand that much more than the steel
That's my best guess anyway, I could be entirely wrong, and when it comes to machining I have no clue
Man this was amazing.
The Rotary subculture reminds me of the Flathead Ford cultists. The engine has been tried and found wanting but there are still passionate adherents. It's a strange world.
It is a flawed and inefficient engine that has the mpg of a v8 but power of a v6.
It's maintennance schedule includes a complete rebuild. The only thing it offers is a lower centre of mass and output for its physical size.
Those that think a rotary engine is an engineering marvel are mislead and misguided.
Then there are those that are truly delusional that will try and refine a flawed design and chase perfection, and justify it.
But hey,
Some people dance
Some people sing
Some like cats
Some collect pokemon.
You love what you love.
I have an RX8.
And i love it.
@@noname-sd5dt what a rollercoaster of a comment.
@@averyingegneri5983no kiding
rotary engine and reliable in the same sentence. Ive got to see this
Only rob can mesmerize the memorizer talking bout rotary
Thank you MotoIQ, Mr. Kojima and Mr. Dahm…the car knowledge you share with us is Priceless.
Build one Mike! 🎉🎉
Sweet videos as always, robs audio is eco'ing a bit and sounds hollow
I want to see the housing for the rotor on the shelf...
Definitely have to test thermal coating, and it would be on the rotor itself.
56:20 had me dying!
😂 same
3 rotor mid engine car like a boxster or nsx would be neat for a track car
Theres a guy in Alberta that has a 3 rotor mid engine kit car, looks almost like a stretched out Cayman, really cool, forget what the car is called tho.
@@plav032 I want to build an SLC roadster with a mild 3 rotor in it.
I was gonna mention that to Vtech academy but, I didn't have the heart.
One guy is building a nsx on youtube now
Tuners just like builders have different ways to make power, and if you get the wrong combination, or a different driver and different input style. things happen.
if you're building a track day car and keep it 2200-2500lbs, 350-400hp's should be more than plenty to have some fun
"your apex seal has exited the chat" 😂
The Rotary "gatekeepers" are punching the air right now. Let's goooo!!!!
In the beginning what does Mike mean when he says “you don’t want to hear my opinion” I’m assuming he’s not a huge fan of rotaries?
WHHHHHHATTTTTTTTT!?!?!?!?!? SO STOKED FOR THIS
Long story short, Mazda just doubled the price of crate motors 😭Just in time to curb my enthusiasm for a potential engine swap that would be baller...might have to wait a while. sigh...
I could watch this the whole day
Same here!
Two of my absolute favorite car nerds 😊 just need Richard holdener on the dyno❤- absolutely love learning from these guys
These 2 guy have the combined knowledge of Thanos, I feel like when they are together their combined power could compare to the infinity gauntlet with all the power stones😂
Let me walk you through the Donnelly nut spacing and crack system rim-riding rip configuration. Using a field of half-C sprats, and brass-fitted nickel slits, our bracketed caps, and splay-flexed brace columns vent dampers to dampening hatch depths of one half meter from the damper crown to the spurve plinths. That's primarily what supplies the go-force through the triangulated hexagonal viscous hatch ampler.
Only if its an automatic transmission.
Has Dahm tried WPC treatment? I know Kojima has done a couple of videos on it and rotary drifter Kyle Mohan swears by it.
rob show me were does all that fuel compression go into the next chamber past a 2mm apex vs 14mm hole you rob have leaky engine vs a piston engine with no leak
05:57 😂😂😂
When we getting new video lol😅
@@trentdavis9809 damn dude. Realistically probably in the next month or so
I haven't built a rotary motor yet but now I kinda want to lol
Lol that's what I said I started searching eBay for a full motor and trans to go with. I'll build one and put in my B5 lol . Just bc 😅
@@MR.ROBOT...76 LOL keep me posted
It’s like when Mordecai and Rigby get so smart they operate within the astral plane
legends
where would a guy go to purchase a rotary engine or part one together? for experimentation.
We get our core engines on ebay a lot of the time.
Ahhhh shooot, what a collab
So funny watching Dahm avoid talking in memes
I've watched this already, and damn its been 7 months already
What is with the doubled audio?
Oh shit the 6 rotor crank
Fantastic
Really great video guys, awesome collab!
Does anyone know who Rob is speaking of at 58:42?
A bunch of shops are controversial on the forums and facebook group, but it's probably Chips Motorsports.