How to rebuild a Rotary Bridge Port engine ~ fullBOOST tech files

[@mrolskul]

Having only worked on piston engines, this was very enlightening. I had basic knowledge of the internals of a rotary but now understand what makes a 2 and 3 rotor engine. You just gotta love the simplicity of it all. BTW, nice RX-3, as it is known here in the States.

[@_Bonez12]

Just watched a whole rotary being assembled and they STILL seem like black magic.

[@tentacionndlovu6343]

And they quite reliable too

[@step4560]

OMG! Thank you! Such a nice build video. I used to have a 1973 Mazda RX 3 Wagon that the previous owner cut the roof off of, because he wanted a convertible! Soon after doing that, he discovered that the vehicle flexed way too much without the roof , so he had his local shop weld in a custom full roll-cage. Then he had the 12B rebuilt for high performance and did some minor suspension work. It had a Wink Mirror and DAMN! that thing was so much fun to drive, especially in the early eighties when the congestion wasn't too bad... Rotaries love to rev, not like pistons that have the whole: up, stop, down, stop BS. Rotaries, once they get going, just want to keep winding up. I remember the over rev buzzer all too fondly and miss my old, what some had termed, Road Warrior Car... Rotaries Rock!!!!

[@obotish1981]

keep this guide, because you will need it every 40,000 to 75,000 miles!

[@seanstrange69]

got 160000km at my last build buddy

[@bryanp4827]

@@seanstrange69 still nothing to brag about...🤪

[@bryanp4827]

Unfortunately you are correct...

[@nezerac]

Wow. This was a really REALLY good rebuild video. Wasn't all over the place and confusing. I feel like going out and getting one just to rebuild now. lol

[@20cnaf]

Mate, feel the same. I have an s2k that I daily yet have always loved the rotary engine. Would need to be a secondary car as I couldn't cope not getting to work in the case of a rebuild. If only funds weren't an issue. :)

[@nezerac]

4.57 S2K Buy a focus se. lol. Bullet proof little cars with a manual trans and if you get a CVH do the valve seats and you'll see 400k before you know it.

[@Priotech]

I've watched a bunch of rebuild video's and this one is easily one of the best! Awesome work guys!!

[@beetlebayley5237]

@ 22:49 you can hear why the rotary never "took off". Don't get me wrong. I absolutely LOVE these engines. That sound you hear is actually the engine losing a LOT of it's compression when the apex seals hit the plug holes. Fantastic video! thanks...

[@justa_dude]

Please make more instructional videos like this, I think these videos provide a lot of in depth technical information for motorheads like myself

[@SloppyMechanics]

awesome video, i love your in depth videos with engine builders and narratives, showing the portwork and many internal parts of a rotary i did not know existed, also filling alot of blanks, thank you for taking the time! as always!

[@Camhin1]

Sloppy Mechanics hi Matt

[@netmatrix75]

This is a great resource on bridge port. I always hear about bridge port in rotaries, but knows nothing about it. Now i know! Thanks!

[@caseylenhart1660]

Nice video, thanks! However - for clarification to anyone not aware... When installing the oil control rings into the rotor, the notch side not only needs to go down, but the notch must align with the squared tab end of the spring. You were clear about the other side - the rounded end of the spring being positioned into one of the small holes in thew rotor, but you did not mention the notch needs to align with the spring as well. Thanks again for sharing!

[@dubsaloon]

Watching this makes me want to install a rotary into an old pickup with a failed engine just to have some fun. Thank you.

[@jrluis305]

I'm Old School Rotary Junky And This Video Is Well Done!

[@vk4frik1]

Great video. Nice to see a motor put together and explained how and why it was done.

[@pedrovelez3165]

THANK YOU,GUYS...Making it easy for those that we LOVE Rotary....

[@SquillyMon]

What a marvel... Lots of delicate looking seals...I know they work well but Im still surprised. All in all definitely fewer parts than a normal piston engine. I really need to pick up a 13B or two and marry them together... This looks very easy and my understanding of the rotary has moved a bit further because of this engine rebuild video....and you just GOTTA LOVE a rebuild video that ends under the hood and running for us...SWEET... Nicely done!

[@atheosxgaming]

itd be cool is this process did actually take 24 minutes and 12 seconds.

[@boblecocojames]

You can rebuild one and put it back into the car in a day if you know what you're doing.

[@vinwilliams6562]

Only if you want to blow your tips off

[@georgeapirana812]

🤣🤣🤣

[@timurdenisleam6762]

@@boblecocojames you give us hope

[@quinnjohn1]

Fantastic video! I think this is a great addition to your channel, straight forward, easy to understand and to the point. I really hope these videos take off. Great work and thanks!

[@fullboost]

Thanks for the positive feedback everyone. We'd like to do more videos like this.

[@heilong79]

Best video on engines I have ever seen

[@BackyardMechanics]

Chris McEvoy thanks, we have a few more coming, and hopefully by the end of the year we will start work from scratch on a project car so make sure you subscribe to the channel!

[@juancabeza5809]

+MrParts_RotaryRaceCars No, you was very disrespectful to the other guy above asking about the seal. We will not subscribe to people like you who think that they are entitled to mistreat people whenever they feel like. People, look for aaroncake here on you tube, he has a very good series of videos about rotary engine rebuild.

[@juancabeza5809]

+Juan Cabeza *you were

[@juancabeza5809]

matt williams shhhhhhhh... kid

[@bertrx-7406]

juan cabeza Lol sissyboy don"t get your panties all bunched up in there.

[@paulwhiteman3625]

That engine sounds so sweet! Can’t wait to get my own one🥰

[@mytmousemalibu]

YES! More of this kind of stuff Fullboost! Can never have enough rotary!

[@yureqa]

Thanks for that. I've always been fascinated by the 'other' type of engine but not had a really good understanding of how it is put together.

[@sadigov]

Thanks for posting this. Always wanted to see the rotary engine dissected.

[@sweetr333]

bloody awesome video guys. Thanks so much for posting. Watched it all the way through.

[@apismellifera1000]

That was really cool! I have always wanted to see how one of these engines is rebuilt. The car that it went into is very beautiful and I love the paint color. Thanks for sharing

[@MechRider89]

man rotary engines are cool, I so need to try one of these babies out! Thanks for sharing this.

[@henryrubio8534]

Not in the rotary engine crowd but this video was very precise and detailed!

[@CeeJay1972]

Thanks for putting this video together, its been really interesting to watch.

[@justfishing6067]

My first car was a first gen rx-7, i also got an A+ in "advanced" auto shop class in hs for rebuilding an engine for it... I remember how much "fun" getting those seals in place was, the corner and the side seals were a serious pita. Back then (96), there was not nearly as much available as there is now, however i spent lots of time browsing those mazda trix catalogs dreaming... Makes me almost want to pick up another one of those cars. And i think transmission assembly gel would work much better holding everything in place when assembling. ;) They even have different grades depending on how much hold you want vs temperature.

[@CSXer]

This was very cool! Never knew how these motors worked. Thanx.

[@tentacionndlovu6343]

That engine sounds so good

[@dredrotten]

Excellent video,I was facinated and at how intricate these things are!

[@FreakhouseX]

rotary enige sounds very clear nice done

[@Bassotronics]

Awesome video and beautiful vehicle!

[@apismellifera1000]

Amazing!! These engines are much more simple than a piston engine I like it now you need to do a video on how to turbo one of these

[@sammacleod3471]

Good instructive video. Suggest removing the pressure relief valve from the front of the E shaft and replacing with solid plug as most of your extra oil pressure will just vent off there. Don't want to add pooh to your ointment lads, but while the external port profile is good, the internal profile of the bridge port is crude. It sounds great at idle but doesn't bump up the hp of the engine as much as it could. Most of the intake charge will rush past the b/port and go through the main port anyway. Trick is to redirect an even higher percentage of the flow through the b/port. Thats all for free ;o)))

[@boringmyself]

I could watch shit like this all day!

[@JonathanRodriguez-vy8ig]

Yup, I'm thinking of doing it myself too even though a shop I found, was charging me 800 which is not bad but I like trying new things!! With this video I'm sure I would be able to do it I just wouldn't fire it up. Unless it was getting tuned right away.

[@Northstrm]

Awesome video! It was really easy to understand the process.

[@MarxLynx]

Awesome video. You make it seem like anyone could go do this easily

[@ramairgto72]

Love to know the power numbers this engine makes. I built a model Wankel long ago, even read a book on them, great idea, but it was never intended for making huge power numbers, glad some do.

[@leahcimthgirw3163]

learning about this motor in my highschool shop classroom with our teacher mr spaulding was awsome

Dang, lucky

[@ViceVersaMusik1]

Rotary Engines Dont Look To Bad To Build, And The sound of a Ported and Bridged Rotary Engine is just Priceless! Theres No Other motors that are like a Rotary! Thats why they are worth owning in my opinion. Id Like to buy a 20B and drop it in a Mazda Miata or a Honda S2000 because there really small cars and I just think a Rotary would look good in those engine bays, and sound nice too.

[@Mr0erick0]

Now I feel comfy buying the rx8 thanks man ^^

[@Mike-dy8sj]

the rx8 is poop. it's extremely slow for its sporty pretensions. And takes a bunch of $$$ to make it anything near quick, which only makes it even less reliable. If you want a rotary, but think this is a ton of complex work you don't want to deal with. than in reality you actually don't want a rotary. the rx8 drivetrain is not reliable and requires constant love and maintenance to keep it happy. even in stock configuration. Plus God only knows what the previous owner put the car through and how well he maintained the rotary. Like I said, if you want a rotary for whatever reason, but don't want to deal with headaches owning a rotary can cause. than take my word for it you don't want a rotary lol.

[@cokbagus23]

+Mike Labonte whats with the hate ?

[@chrissmel94]

+cok Bagus I currently have a vw gti but I'm looking to buy a non turbo fc3s soon, and doing my research on these. I do notice much hate on people who own a rotary, I don't understand either, they seem fairly simple to handle if you know what you're doing.

[@jimbowcracklehead8071]

Mike Labonte have you even owned one?

[@johnromano3567]

Great vid! suggestion, use a press for bridge porting & follow up with dremmel router. that way you get crisper angles & then flute edge. Flute like 01°. Does that make sense the way I explained? I use rotarys geared down for my aircraft.

[@borilopez8581]

Great video i really enjoy it and learn a lil bit more about rotary engines

[@AdammP]

outstanding work! also that is one of the nicest sounding engines i have ever heard..

[@deanjones9150]

Excellent video and description! You need to show is how to do PP rotary now please, thanks.

[@justinbeckelly]

that was one of the best things I have seen on KZbin for ages. Have you guys got any other porting videos

[@martingeeves9817]

Top job mate.. Clean and organised..

[@willw941]

im not really a rotary guy but this was a cool vid thanks!

[@rboote7232]

@fellowship of the goat, The Corner seal and Side Seal run along the Bridge, If you had one big port in the side the seals would fall in and it wouldn't end well.

[@piffiiiiiiit]

Still done by hand?? I thought in this day and age it would be done with a CNC machine Bravo

[@fullboost]

Nope, HEAPS of rotors are still built by hand exactly like this.

[@piffiiiiiiit]

Fullboost Must be some talented blokes around

[@MichaelGedies]

piffiiiiiiit people who love their jobs i bet i'd love to be a machinist, the art of porting and angle grinding is just awesome. especially when you see how a minute angle difference in a grind job can make such a difference in some cases. All you gearheads stay safe. Just here to show some love. Greetings from Houston, TX!

[@94XJ]

Michael Gedies There's a lot of work available for machinists, you can make a good living at it, too... especially if you save up enough money to get your own equipment and do it on your own. I think 2-axis CNC plate work usually runs us $60-80 an hour if it can't be done in house unless it's really big and needs to go on a boring mil. The sky is the limit then.

[@lesoneill8714]

Very Informative I've always wondered how they seal the combustion chamber & now I know, Thank You. I'm a Valiant-Holden Man Myself & A Firm Believer In "There's No Substitute For Cubic Inches" But Credit Where Credits Due, Rotary's Are Bloody Awesome & Theoretically There's No Size Limit For Rotary's, I'm Also A Firm Believer In Extreme Power & Revolutions, Interesting?

[@HugDeeznueces]

Awesome vid! Wish I could get a hold of one to play with.

[@doktorbimmer]

*Today marks the 7th anniversary of the end of RX production, on Thursday June 21, 2012 at 4:30pm the final RX-8 car ever to be produced rolled off the assembly line, the last RX model to ever be produced by Mazda.*

[@fullboost]

You really dislike those engines hey? lol

[@doktorbimmer]

*Not at all! I love to collect old antique and obsolete engines*

[@bodhifyer]

That was the most gangster video I've see all day

[@Horus9339]

Fantastic video. Thank you for sharing.

[@ToreDL87]

Always thought of the Rotary as a "air and fuel goes in, illuminati and brap brap happens". Learned a lot from this! Thanks a lot :)

[@modwlego]

You didn't finish that, Gas and air go in, Illuminati, Doritos and brad brap happen, And Apex seals come out.

[@ToreDL87]

modwlego From what I`ve seen, apex seals come out when idiots add random Stage 3 shit, start turning up fuel and boost with zero fucks given, then they go balls out on the throttle 95% of the time they drive the car :) Not to mention all the drag-strip rotary`s live a pretty harsh life as it is (almost 100% on full throttle). Take a healthy stock engine, add moderate boost levels, be mindful of when you floor it, and it`ll last as long as any modded motor.

[@modwlego]

+ToreDL87 so, if we look at all the RX-7 drivers on the road, profile them, and determine their driving style, that means the amount of engines that are going to blow every seal in 10k kms is about... All of them.

[@ToreDL87]

modwlego :V Sorta cant argue that can I... I dont own a RX7 :P

[@frogchaser]

I really enjoyed that and it sounds amazing

[@justa_dude]

Badass instructional video, very detailed

[@donaldhastyjr4066]

Beautiful engine, beautiful car!!

[@stuartmccloud307]

Excellent video guys, a mine of information. Cheers, I feel my upcoming rebuild is in good hands now!

[@Shauny808]

Such an informative video. Cheers guys.

[@rosedeath1965]

I watched this video once and I convinced myself to buy a fd rx7

[@ifrit35]

That' looks even less complicated than a 2 stroke.

[@ViceVersaMusik1]

Thats exactly what I just wrote in my comment, about 3 or 4 comments up ☝! But that is so true! I feel like I can build a Rotary after watching a couple people building them in different videos. The ONLY place where I would get mixed up at is when you have to start adding all the parts that attach to the engine, Like the A/C and all that, but even that looks slightly easy... depending on what your adding, because this is a clean N/A setup. But yea man.. . . I was thinking the same damn thing!

[@DuBstep115]

Nothing is less complicated than 50cc 2 stroke

[@seanstrange69]

@@ViceVersaMusik1 haha the assembly is easy its the measuring of all the tollerances on everything.... otherwise engine will not last and fail

[@SchoolofHardNOX]

sweet video, guys.

[@edwindelgado5880]

The best tutorial ever!!!!

[@mehdimoutadjer1096]

Fantastic video . Thank you

[@FixAllFixer62]

Very nice guys

[@starbattles1]

Thats bad ass man. My first look inside a rotery. Who ever came up with that kind of motor idea was brilliant and eccentric. Seems like it would take a bit of a twisted mind to come up with that and then make it work. And you can beat the living piss out of it too. It's probably more simple then it looks once you know what your doing and done it a few times. I wouldn't mind having one to play with

[@patto505]

+starbattles1 Rotary engines are fantastic to work on, because they are so simple. You will work on them quite often however :)

[@ToughLuckDumbFuck]

I like some of the puns you used there haha

[@harrybalsaq3362]

+patto505 lol

[@20cnaf]

Wankel engine. If I remember correctly, Felix Wankel was his name.

[@doktorbimmer]

Wankel... this is a Wankel engine..

[@JR1300r]

Outstanding video cheers

[@TheCanadianBubba]

What ... no burnout ? : ] Haven't seen an 808 for probly 20 years here... thanks for the memories

[@silentdeath1711]

The tail lights are 🔥🔥🔥🔥

[@dc5000123]

Brilliant Video !!!!

[@samjohnson7325]

For the novice rebuilder. Sideseal clearance is 15-40 tenths (.0015-.0040,) not 15-40 thou. (.015-.040)

[@1991tommygun]

I hate rotors but this looks simple and I like simple setups

[@fifocrew3040]

Well made video. Cheers.

[@MrEvol300]

keep up the great work man

[@2JZ.S30]

Do a 20B Turbo build next :)

[@diamondforehead833]

Nice to watching

[@BeroTTo]

This is the normal operation of the engine

[@jonog5632]

Mean video man . inspired me to build one.

[@BackyardMechanics]

killer! post up some photos in the new fullboost group on facebook facebook.com/groups/FullBOOST/

[@DawgYa1]

That was awesome !

[@MrGsxrme]

0_o I'm speechless. Rotary is an art to rebuild for damn sure. very good walk-through video.

[@RayTitske]

great job the engine sounds amazing

[@kedaotuning]

sounds like very good compression

[@MarshieBoy]

OMG great video, have to try this sometime haha but seriously, really good learning video. Thanks!

[@therealdokoterbimmerrotary6751]

THE FOUR STROKES OF A INTERNAL COMBUSTION OCCURS SIMULTANEOUSLY IN A WANKEL ENGINE THIS MAKES IT MORE EFFICIENT THAN A PISTON ENGINE

[@Psychopathis]

You are the best thank you for this!!!!! i would like to pinpoint only one tiny little thing; it would be better if you could speak a bit more clearly for us non english-speaking people its slightly hard to understand those mech words. Again thank you very much!!

[@LittleBanditMicra]

Brilliant video!

[@ziggassedup]

Interesting stuff.

[@deusexaethera]

Thanks for the info, especially regarding the D-shaped exhaust port. I suspected that would be the best design, but I wasn't certain. I was also intrigued to see how you milled the faces of the rotors to prevent scuffing against the housings at high RPM. I plan to use this info to modify the tiny rotary engine in one of my RC cars...if I ever get that car up and running in the first place. I have a question, though: Are the scoops in the faces of the rotors really the best way to transfer the fuel charge from the cold side of the housing to the hot side of the housing? Or would it be better to have channels cut into the housing at the point of maximum compression, and use non-scooped rotors instead? It seems like non-scooped rotors would do a better job of thoroughly evacuating the exhaust gases, and also minimize port overlap regardless of the port design.

[@floofymcnuggets_2373]

I never new there were that many little seals in rotary's crazy how they can take the heat

[@WPTUNED]

would this build be the same for the rx8 engine?

[@geazzz]

nicely explained video...now i want a roatary engine to disasemble and put together again :P....didn't know they were that simple... :) have done some disasembly and reasembly of volvo enginges in my early days.... :)

[@connoisseuroftigolbitts]

they are not as simple as you think... it takes alot of time and patience

[@rotam8680]

They are simple just tedious

[@lukka90210]

this is the first guy, who knows how to fix the screws in a motor. In X cross to get same pressure at the whole part. And!!!!: use those bolts only one time! Guess why

[@Parkittaja]

Fullboost ! RX-8 have engine like this !

[@Shadow0fd3ath24]

Lännenlokari nope. Totally different port and rotor housing design

[@finlay230]

excellent vid, first class !!

[@number40Fan]

How did you degree the cam? How many angle valve job did you perform? What is the ratio of the rocker arms used? Sounds like a mean V-8. :-)

[@number40Fan]

LOL, I know.

[@bryanp4827]

It's the roller rockers and cam with the two huge lobes that does the job!🤣😂🤣🤣👍