Tearing Apart and Inspecting the Blown RX8 Engine
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- čas přidán 22. 01. 2021
- In this episode of project blown RX8, I tear into the blown 13b rotary renesis engine and discover why the compression is so low. Join me next week when I build this engine back up with new components!
- Auta a dopravní prostředky
To those watching! Don't EVER use an impact to break loose the tension bolts. They are long and you could snap them in half. Loosen them 1st with wrench and THEN you can use impact afterwards only after they're free.
One of the best videos to pop up on my recommendation
Can not wait to see the rebuild process! I'm going to rebuild my rx8. I have a Greddy Turbo kit to bolt on when its rebuilt!
If I were you I would send off your housings to have the exhaust port ported. Rx7 specialist on youtube have a decent charging price. It's suggested for turbo applications.
Also plan on new rotors machined for rx7 apex seals, also offered by rotaryengine.com (rx7specialist)
@@sofakingdom3076 street port would be the best to go for a turbo rx8 on a renesis block.
@@sofakingdom3076 currently running a 8374 EFR on an renesis that was rebuilt by them with a street port. Next rebuild 2mm apex seals, studded and balanced
@@Fazer1971 exactly what I've done
I have a friend who is putting a Honda V6 in a blown RX8. I asked if I could have the Renesis and he gave it to me. There were no broken seals but the rotors were full of gunk and carbon. The apex seals came out in pieces because they were so stuck. Rotor housings had chatter marks and worn chrome plating. The car apparently just sat for a while because the rotors left “stamps” on the irons. I was hoping the damage wasn’t too bad because I wanted to rebuild it... but the whole thing looks thrashed. I still have it torn apart in my garage as a kind of trophy, as I absolutely love rotaries. Good luck with the build!
Great content. I’m a RX8 owner as well. 💪🏼
Really brilliant editing on this! Love the into. Keep it up
Loving this content man! Keep the rebuild videos coming! 😁
Finally its up! Awesome video man!
I really enjoyed you taking this engine apart showing us what can happen to the Rotary! Hoping mine never does that. Love my 2007 RX8.
I'm saving up to get a rotary so this is probably a good skill to learn LOL
Love your channel. Been watching you for years. Keep up the good work 💪💪
Nice one your are the best 👍😃
Thanks for the video and hello from Ukraine!
Keep them coming 👍 👌
Been waiting for this video !!! Finally
great job man, looks like tons of fun😂
Hey on the next video can you make a list of cost? Thanks! Love the content.. makes me want to get an 8 again
Just priced it...$5310.75 not including sales tax or shipping. That's from Atkins Rotary.
ouch. new Houseing, new Side Plate and new Rotor needed. that hurts.
Love your videos, could you share a price breakdown of the new replacement engine parts you intend to buy and where you are getting them from? Thanks!
Well done on your teardown, oh no about the state of it! Are you going to be doing some porting? I have a motor I need to rebuild too man. Enjoying this!
Its cheaper if you grind, send it for re-nitrate and then lapp the iron plates...
Are you going to balance the rotors together with the e-shaft? Would be great if you showed it...🙂
umm something little like a spat out apex seal well a spat out apex did so much damage to my rx8, housing and 2x rotor and the intermediate plate as the both intake port had massive scratches in it, Al marsh the rebuilder builds and maintains a rally rx8 here in nz klinky and man shes running strong now 2 track days, my issue now is rear shock so have a rear set coming hopefully can get it ready for the Ashburton street sprints, ur damage wasnt as bad as mine i was on the motorway when it happened so had to get it off, ....
side seal* not apex seal...
you can tell because you're side seal is missing and it stayed a perfect line across the side of your rotor. it obviously snapped and skipped out of its groove, jumped up on the rotor and the next time the shaft end play was utilize it left that impression. if you've ever seen a broken apex seal failure in a rotary, you'd know your housings would look like a grenade went off in them, not a little scratch.
either way time for a new engine. best thing you could do, get a reman from Mazda for cheap(they typically use new parts for most of the engine), crack it open and clearance and balance everything yourself, its actually quite easy if you have the specs. rx8 13b msp's are notorious for coming from Mazda totally out of spec. rotating assembly is extremely unbalanced, end shaft play out of spec and side seal clearance absolute trash.
here's proof- czcams.com/video/p6YFQQ7FiIk/video.html
Either way, a Renesis engine can throw down 400hp with the right modifications tuning. ( czcams.com/video/5uwFiQlD-ds/video.html ) Currently sitting at 325hp/240ftlbs at low boost 9psi on 91pump gas. in a few months i'll be sitting at 400hp and around 300ftlbs on e85.
Everyone says "apex seal *insert some excuse here*".. if properly maintained and built, they're powerhouses that are reliable.. unfortunately its usually 16 yr olds that treat them like a Honda civic..
Nice vid!
How many miles were on the engine? And I'm curious about what oil you ran, whether or not you premixed and if your 8 has twin oil coolers?
I own an rx8 as well and it is much more cost effective to exchange your core engine for a Mazda reman. Cost me 2950 to do it and I got new housings plates rotors etc. for the cost Mazda reman is the way.
F in chat for the front housing
Mine is the opposite most my damage is the rear housing
Shoot! How much was the replacement front iron, rotor and all that? Would it been cheaper to just get a new complete engine?
My omp lines clogged,I didn't know till I started disassembly, the lines have shrunk and hardened, and clogged from sludge, I lost 1 apex seal, it broke in half, and went around the housing till at some point it exited through the l exhaust because it's gone and my o2 sensor had been hit by something, out of my 5 remaining seals, 4 were stuck, I have unstuck them...can I re place omp lines, and moving seals and be ok? Or am is it trashed, i had good compression before this failure 95-100 psi on all faces
Where do you get the Parts for my have the same problem
Something little like a apex seal popping out... Bahahah
Sorry about the bad news dude wish u well I got 135000 on 2004 and its just a mater of time
I also have a 2004 at 95000 miles. Runs perfect. Do you premix? I dont
Yes I do most of the time but when u premix u have to put premium gas to clear it out if not it messes with your cat and your secondaries
Are you going to lighten the RX8 rotors, machine for rx7 seals? I heard that's the best way to rebuild a ren but I could be wrong.
the rx7 apex seals are taller and heavier due to them being taller. Which means they can avoid catastrophic failure easier, but they will cause more wear on both the apex seal and housing.
The reason mazda went to the shorter apex seal was due to the high rpm potential of the rx8. Spinning that fast will cause the apex seals to be pulled outwards away from the rotor. The more the seal weighs, the more force applied on the apex/housing surface, the more things wear.
Now the shorter rx8 seals do cause more bending on the Rotor's apex seal groove. Which is the catastrophic failure that likely happened here. For both my engines, it appears rx8 rotors die around 120k miles......they might last longer if you were to do rx7 seals initially or just rebuild the rx8 seals sooner(60-70k miles) instead of trying to milk the engine. I'd rather replace the cost of seals every 60k miles than the entire engine every 120k miles.
The rx8 rotors are not balanced from factory which will always be a plus in something made to go high rpm. Mazda just had similar weight classifications for the rotors when they were produced. Personally i'd buy a set from a reputable rotary shop balanced and machined for rx7 seals(note the corner seals also need to be machined/swapped)
@@mincvinyl Thanks for the full explanation. I don't own a rotary vehicle but I've been wanting one for some time now. I've driven my buddy's Rx8 with coilovers and upgraded sway bars probably the best handling car I've driven next to a 2017 corvette c7 grand sport.
Yeah honestly handling and suspension is the one thing mazda really goes all out on. Since it is a small company I think they have an easier time on design and tuning than mass producing high hp cars. Mazda probably assumes people will modify their cars for hp if they wish for more. Ive talked to people that engineered Porsche race cars tell me the rx8 race car they worked on was on par for handling.
"Put turbo on it"
"Put turbo on it"
"Put turbo on it"
"Put turbo on it"
"Put turbo on it"
"Put tubo on it"
"Put turbo on it"
@D.S. M Yea they do, just not the Rx8 Renesis. It does better with superchargers.
@@13bfc renesis is fine with it aswell as long as it’s properly tuned and not using to much boost
Rotaries do fine turbo'd dunno what crack you're smokin.
The Rx8's MSP Renesis 13b doesn't take to turbo/supercharging well due to the intake and exhaust designs. Limiting factors are the lack of any overlap, restrictive exhaust, Siamese center exhaust port and sleeve. Generally it is theorized that the renesis has a 450hp hard cap that is likely impossible to pass. Brettus on the rx8club forums is the highest hp while maintaining a crazy usable powerband and that build is around 420hp range right now I believe.
@@mincvinyl so it is best if I put a turbo and change all the exhaust/intake system, or it’s better with a supercharger?
@@Daniel-sq9xv Well since nobody really makes a supercharging kit, getting a turbo kit to achieve the same power will be cheaper. Now when you talk about turboing a renesis there is a multitude of issues to get around. I'd suggest reading a lot of threads on the Rx8 club forums before anything else.
If I needed a rebuild. How much would you charge me?
yikes. withh that much damage, id say get a new engine and save youself the trouble.
but I guess the rebuild is content and im interested on how it will turn out
Run KMR seals on your motor
Watching this video, I’m so glad I sold my Rx8 before the engine turned to Dorito dust 😂 someone else’s future problem now
Im sure who ever owned that var probably never let it warm up
You didn't show the condition of the bearings ☹️
When doing a rebuild, you should replace the bearings, they are (relatively) inexpensive (and you only need 2.)
@@SeanFlaherty absolutely, but that's not what I meant. I wanted to see the condition of the stationary gears and rotors bearings, especially that stateside you guys use 5w20
@@bv2289 When I read your question, I was thinking "it doesn't matter the condition of the bearings, replace them anyway." But yes, it would be good to see the wear on the bearings. I'm guessing a chunk of carbon knocked out the apex seal, but maybe there was a bearing failure?
I'm getting my Renesis rebuilt (which have low/marginal, but even compression) and I specified new housing and bearings.
BRO I SWEAR TO GOD, clean all the parts with diesel, clean the rotaries in diesel
Hey Japanda tuning my mom has cold feet when hiking can you recommend any heated socks thanks
Shiiiiit....
Front, iron, front housing, front rotor, center iron...all because of 1 apex seal...jesus...
Still love the rotary engine but fuck apex seals XD
Don’t burn your money! It’s a waste of time if you only buy what you said. You need to measure properly with the workshop manual all the parts that you think are in good conditions. Keeping the old housing or refurbishing it it’s a nonsense. You want a good engine? You need two of them.
Plus that: all the gaskets, seals, bearings,...
Do a nice review how is a healthy assembly because if you go ahead only with few changes you will see the waste of money and time.
Kind regards.
You can start a nice video putting in the table a 100% of pieces. How to measure them. Calculating the price,... that’s the beginning and the people will thank you a lot because 75% of the people don’t really consider how expensive really is. Looks small and cheap. Wrong. Healthy renesis are difficult and expensive.
Kind regards!
Oh sorry! My English is so bad. Already hear you’re going to buy 2 housings. Perfect!
Kind regards.
Your going to wish you didn't take the oil pump apart
Why?
@@13bfc its a pain to put it back together beacause of the key in the keyway.
@@mflbikes1870 I just held up the key with a small screwdriver from underneath and it was no problem going back on
It's not as bad as you think. If you line everything up right, it should all fall back together. I just thoroughly cleaned mine up, and it was the very opposite of a nightmare.
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