How To Resurface Rotary Engine Housings - Its Like a Cylinder Hone... But Better!
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- Опубліковано 29 чер 2022
- In the rotary engine world, there is no Over boring, or Honing a rotor housing like you can a piston cylinder. Until now, Resurfacing/cleaning up the surface of the housing has made matching used housings so much easier.
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/ radpotential - Авто та транспорт
You and Rob Dahm are honestly the gods of Rotary
Share it with your friends!!
@@RADPotential You're the first name I recommend to anyone who even brings up rotaries
Thanks Man!!
It will actually run longer than a little while. 😉 As long as the gouges are BELOW the surface and on the exhaust side, you won't have a problem with the apex seal catching anything. Over time, those grooves will fill with carbon deposits and level back out. Back in 2005, I rebuilt my 91 vert and put in brand new RA seals. The damaged rotor housings had longer gashes than what you demonstrated in this video. I put over 55k on that rebuild and that engine had great compression and got 26mph hwy. It only failed because of those trashy tephlon encapsulated coolant seals I was experimenting with at the time.
Can't wait to watch this! I didn't know you could resurface your own housings!
You can't. But you can watch someone fuck them up with this goofy approach.
@@funone8716 yeah I thought there was a coating on the inner surfaces? one you can't just 'fix'? lol
@funone8716 rob dahm does this to his 700 hp tenth ae rx7 if it's good enough for him it's good enough for anyone 😉 oh and the chrome plating is 0.03 thick you can see how thick it is when looking at the edge of the housing!
Great video but please share info on grit of sand paper and how many different grits to final polish. Thanks
Following for info
Love the videos man. Educational and at the same time entertaining. Planning to get an S5 FC turbo, still looking for one at the right price and your videos are really a big help. Hoping I could bravely take apart the engine enough to recondition it. Thanks!
I've been looking forward to this video! Keep up the good work and information
Very informative and good idea bro keep up the good work
Nikasil, as in Mercedes, NSU, Citroën RCEs, is better under any circumstance than the Hard Chrome some Wankel engines used, as OMC. Suzuki RE-5 had the plating patented by Alfred P Grazen in Canada.
Thats a great way to resurface housing. I did it the manual way with some 220grit wetsandpaper and a dowel pin. after a few hours you can get those results. Yours is way better though!
I used the same idea but I put transmission oil a little bit to save the chrome and May sure used a gauge to check cut straight o used a apex seal 🇵🇷✌️👍
I think I might give this a shot
Mann you have let the cat out of the bag! lol. Some people charge an arm and a leg for this service.
Great video have been looking for a couple of weeks on UA-cam for a video of someone doing this would be interested to see if you were to do it by Hand (no access to a machine like that) how you would do it, I’m working on some 12a housings at the moment that could do with a light clean up
Upon disassembly of my NA 13B built by Kevin Landers in 2016, my housings are in about the same condition as these with roughly 1.5mm of edge wear on the compression strokes. I’m contemplating this method to potentially save them before buying a new set.
Given the lack of precision, this is a bodge at best.
Theres a guy named Kyle Mohan, he races a 20B RX8 in formula drift and talks about something called WPC treatment for housings. It reduces friction and some other things. im not sure if it replaces the entire factory coating, or goes ontop but that could be something you could look into. He did mention that people do it with even brand new housings, so could be interesting.
Yea man!! I have seen that video. I'd be interested in trying that over top of surfacing them!! Super cool!
WPC has been around for a while, Mazdatrix offers the service, its essentially shot-peening that dimples the surface to create pockets for oil to sit. It doesn't replace the factory coating. (oem housing is a steel (or iron?) sleeve in an aluminum casting, with a chrome alloy electroplated onto the iron.
WPC would probably be a great addition to a housing surface, though the lining has a level of oil retention already. What i'm the most interested in personally is goopy's chrome-replating service.
@@1OMEGA111 Ah okay that makes sense. I didn't do any research on it, but I just heard about it. Sounds interesting.
There is a process where metal is "sprayed " on to build up the thickness and fill in gouges. this could possibly be used to build back the chrome on the rotor housing.
nice work can you tell me what grid sandpaper you are using?
ive literally been doing this for years, great video tho
Amazing video! What is the measure of the paper sand?
Try using coarse to fine levels of abrasives say 800 to 4000 grit. You may have better results.
Can you cover how to modify the center irons for a bridgeport?
Can you do a vid of a carburetor install for an fb? I’m looking an fb and it’s missing a carb so I don’t know how everything goes if it’s not there to begin with. I’m having the guy check the apex seals before I make the deal but still needs a carb.
Hi, canyou upload a video explaning how it run the RX8 oil metering pump? thanks
sick
I think there are some places that can redo the nitride surface treatment, it involves putting it in a furnace with ammonia gas if i remember correctly.
Housings are Chrome plated. Nitriding is done to the side plates, not the Chrome plating (altough you can nitride chromium)
What grit of sandpaper are you using?
what grit sandpaper did you use
Or a flapper wheel where the abrasive flaps are staggered and overlap each other. Again in coarse to fine levels of abrasives.
What grades of sand papar do you use?
What about adding metal to the holes somehow then smoothing or chrome plating
Have you a link frome this honemaschine? Best regards remo
but is it possible to do this, because you have erased the chrome coating
on the deep gouged ones, i have a question. what if you sand past the gouges, and sand to a good smooth surface. then build thickness back up with nickel plating?
so i posted this comment before watching the whole video. i'm pretty sure nickel plating is done to different classes of thicknesses and hardnesses. i don't know what would happen if you send a nickel plated housing without chrome plating on top of the nickel. but nickel can get chrome plated. problem is back in the 80s everyone chrome plated, and dumped the waste water down the toilet. the epa didn't think that was very funny. anyone who chrome plates nowadays probably has their own water treatment facility. so it's going to be pricey.
i used to know a guy who did nickel plating. this guy only dealt with parts machinists messed up and undersized. he'd charge them 2/3 what it cost to make the part, to plate it to proper thickness.
also i don't know if you're cool with it, but there's a place in maryland that does nickel plating. not sure if you're cool with name dropping, let me know.
whats that sander called? Need to get me one of them
i looked for a yt channel with guy on itbut did not see anything pop in a link to his channel if their is one
What was the rpm of the motor/drum?
What is the name of the machine used?
Something you don’t got the money to buy new housing and repair lot housing and they work fine 🇵🇷✌️👍
You can not refinish a housing that has lost plating, by removing more plating, however you can make it look good.
The plating is way thicker than what he is sanding.. he is just re surfacing it oh and rob dahm does the same thing to his housing just with a flap wheel and a drill press.😮😊
Would it be smart to use paint or sharpie to see low spots. It doesnt look like he going slow either to avoid hot spots. Does he change grit going lower and lower almost to a polish?
It really shouldn't have any low spots. You should be able to feel them with your finger nail or a pick. Just keeping an eye on the color change from shiny to dull should be enough
@@RADPotential cool. We totally had one of those machines but didnt know what it was for so we dropped it off at goodwill. Regrets
Where's the link to your friends repu restore?
Is there any possibility to do the same for End and middle plates?
Yes. I used 180 grit on an orbital sander, then Valve Grinding Compound. Per a forum. It worked well and knocked down the shine. The irons don't last as long...etc etc
new to this, I don’t understand why it’s not losing compression as your thinning out the housing, is it not enough to make a difference?
Its like running a ball hone on a piston engine. Just enough to take off some of the grooves, and provide a good surface for the new seals to bed into. It does thin out the housing, and I wouldn't expect a refinished used part to perform as well for as long as a brand new part.
@@RADPotential I would compare it to a piston engine. There must be a cylinder of exact geometric circle. Here, the geometric inaccuracy doesn't matter so much.
Isn't this what the spring is for, behind the apex seal? That micro amount taken off is all it's going to have to expand.
This seems like a good idea for just having a spare motor to set aside for emergency, or to just beat the hell out of on a track for a day until it's done.
you should pin a comment with the sand paper grit and drum speeds. i’m wondering about how much material that takes off, and how much pressure is applied
This has been my dream job since i was a little kid. Hope to one day work and build engines like this. Right now i go to a mechanic school in Norway and after the summer i am going to have 2 years of kinda school but i am out in a actual mechincs shop. After those 2 years i am probebly going to look for a job like this. Dose enybody have eny tips for me in thees coments?
Thats awesome man!! I would find a shop that does the work, and try to become a fly on the wall and learn what you can. Most people will be more than willing to teach somebody who shows a genuine interest and passion for their work!
RANDOM QUESTION…… Do you rev yer rx8 before turning it off OR do it jus let it go clunk!?
Hit or miss. Sometimes I do sometimes I don't, If its not warmed up all the way, I for sure do.
Cannot compensate for more material being taken out of one area though... by hand the pressure and stall time could create an issue.
Any honest shop would probably recommend new housing. Shop rates by hand would be more than a new one.
I feel like it's nice for a cheap personal project to around with. I wouldn't want my name attached to it for a paying customer though!
I was going to rebuild my engine but decided to bring to a rotary specialist shop. I just don't have the time to do it and on top of that with my Parkinson's I can't maneuver my fingers to well.
Sometimes its just easier to do it that way for sure!
@@RADPotential yeah, getting rotors machined too for weight reduction. Plus a street port.
What is that tool name? I definitely need to get that and resurfaced quite a few Housings I have around here
It's an oscillating spindle sander. Used mainly for woodworking but looks like it does a good job on the housings.
@@rmreid83 Appreciate that bro. Just found one on Amazon 😁
@@rmreid83"looks like" is the words today. You can't fix damaged chrome by sanding it away !
@@stevecarlisle3323hopefully no one is taking away the idea that this makes it the same as new... It'll run though I'm sure.
@@stevecarlisle3323the chrome is over 0.03 thick he's only sanding a little off rob dahm does the same thing.... and he's running 700 hp thru his... check out the video of the 10th ae he flap wheel sands his housings down before rebuild... same exact process... ya hater
What grit sandpaper?
I'd really like to know that also. I would guess at the most 320 grit????
120, I know it sounds really abrasive but you see the results. it works great.
7:27 the man used his glove to feel the rotar housing.. LOL
whats bros yt channel i wanna see his rotary builds too
Hay why not measure the thickness, hone and see how much you remove.
anyone know where i can find that tool?
Harbor freight oscillating sander... 99$ your welcome 😊
Cool now your apex seals are gonna be rollin on some washboard rotor housings. 😂😂
I think Goopy can re chrome housings.
They do not. They resurface them with a similar result.
Will a rx7 turbo manifold fit an rx8?
No, the RX8 engines use a Multi Side Port Exhaust, vs the Peripheral Exhaust of the early 13b's.
no
Seems like a terrible concept, how do you know you're removing consistent amounts of material on all sides?
It doesn't so much matter the depth of removal, apex seals are spring loaded, so they will just slide out to accommodate the thinner area. its more important to not sand through the chrome plating on the surface.
Nikasil
Too inaccurate and rough
Rob dahm does the same thing with a flap wheel and a drill press... his engine is making Over 700 hp... seems to work great 👍 👌 🙃
Only in the rotary world is this type of garbage tolerated.
Lol same thing as honing a cylinder wall... he's not sanding past the hardened chrome lining he's just re surfacing the ruff patches and getting rid of the polish from apex seals... if you question it watch rob dahms video of the 700 hp 10th ae rx7 he does the same thing to his housings only with a flap wheel and a drill press... seriously stop being a hatter
@@jo-qp7mz it is? Anyone willing to share the RA, RPK, RV, crosshatch angle, etc that these housings are being “honed” to? Those are standard values that are adhered to when honing cylinders, do you think that’s the case here? Do you think anyone could even share what those values are for a stock housing? I don’t really care what Dahm does, he’s not an authority on anything and frequently gets technical information wrong. It’s a reflection of the poor state of the rotary tuning industry that “professionals” in the field look to him. Demand better.