26B PP Eunos Cosmo
Hi my name is James and thought i might share the build of my 4 rotor powered Eunos Cosmo. Ever since i saw and heard Mad Mikes Rx7 at a D1NZ event a few years ago i just had to build my own. I started the build earlier this year. The car is a 1991 Eunos Cosmo Type E. I purchased the car as a rolling body, which was originally a 20b. Its only got 68000kms on it and the body is really straight.
First thing was to strip the interior, must have removed about 50kgs of wiring and computers. I have done a manual transmission conversion using a FC master cylinder and Rx8 clutch pedal. I have included some pictures of the car. The engine is a Peripheral port based on FC plates, housings and rotors. i will be adding more details on the engine the next few days. https://cimg6.ibsrv.net/gimg/www.rx7...d6092d0823.jpg How the car used to look https://cimg0.ibsrv.net/gimg/www.rx7...bb981f4ae2.jpg https://cimg6.ibsrv.net/gimg/www.rx7...4a56af69d3.jpg https://cimg6.ibsrv.net/gimg/www.rx7...12f7651292.jpg Surge tank install, 2x 044s https://cimg0.ibsrv.net/gimg/www.rx7...b77d7ba4cd.jpg FC booster and master https://cimg3.ibsrv.net/gimg/www.rx7...618fc3448d.jpg https://cimg6.ibsrv.net/gimg/www.rx7...d8e17b4773.jpg Teaser https://cimg4.ibsrv.net/gimg/www.rx7...4fc6ed1ac2.jpg Turbo from my Rx7, destroyed at track yesterday haha. |
now all you need is two EFR 9180s
.. sequentially. |
Yessssss baby jesus, this will be amazing.
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What are you planning on doing with the car? Sounds awesome, can't wait to see it finished.
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Originally Posted by lastphaseofthis
(Post 12123835)
now all you need is two EFR 9180s
.. sequentially.
Originally Posted by KKMpunkrock2011
(Post 12124161)
What are you planning on doing with the car? Sounds awesome, can't wait to see it finished.
So specs on the engine are as follows: Series 4 and 5 centre and end plates Series 5 rotor housings Peripheral ported Series 5 rotors (9.7:1) Precsion Engineering eccentric shaft Rx8 Stationary Gears NRS Apex seals and springs Peterson 4 stage dry sump pump Efi Hardware individual throttle bodys Link ECU. Most of the work has been done by me apart from the e shaft, centre plate stat gear mods and balancing. Attached are some images of peripheral porting the housings. The timing is based on MFR timing. https://cimg6.ibsrv.net/gimg/www.rx7...32c38cb0f8.jpg Practise housing, took hours to set up in the mill. https://cimg4.ibsrv.net/gimg/www.rx7...345565073a.jpg https://cimg2.ibsrv.net/gimg/www.rx7...f84980815e.jpg Turned out all right apart from having to use a sledge hammer to get the insert pressed in. Some adjustment needed in the tolerances haha. https://cimg8.ibsrv.net/gimg/www.rx7...334303cb30.jpg https://cimg9.ibsrv.net/gimg/www.rx7...f547fce98f.jpg Holes cut in 4 brand new housings. https://cimg9.ibsrv.net/gimg/www.rx7...1c61648885.jpg Inserts started out looking like this https://cimg2.ibsrv.net/gimg/www.rx7...575b3af00f.jpg Then this https://cimg7.ibsrv.net/gimg/www.rx7...5e211db246.jpg Then this, ready to be pressed in. All the machining has been done with a maual mill and lathe with no digital readout, so takes bloody ages. https://cimg0.ibsrv.net/gimg/www.rx7...f6d2fab0fa.jpg Inserts pressed in, heated the housings in the oven and froze the inserts using a 50/50 mix of methylated spirits and dry ice. Surface areas sand blasted for a good surface for the devcon to stick to. https://cimg4.ibsrv.net/gimg/www.rx7...5c2fa4c2f0.jpg https://cimg8.ibsrv.net/gimg/www.rx7...b48931e4e3.jpg Finished product all polished up. |
Mean bro. Where abouts in NZ are you? I miss all the dope rotors back home aye haha
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nice.
Where are you getting the eshaft? And do you have a goal in mind on when you want to have the engine running? |
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Originally Posted by JSmall
(Post 12124716)
Mean bro. Where abouts in NZ are you? I miss all the dope rotors back home aye haha
Originally Posted by Johnny Kommavongsa
(Post 12124727)
nice.
Where are you getting the eshaft? And do you have a goal in mind on when you want to have the engine running? |
Purchased some bits. A couple of centre plates, 1 front plate and 4 rotors. The rotors are FC n/a which are 9.7:1 compression, really hard to get hold of second hand in NZ which why they are new. Not much modification required on the plates, just fill the intake ports and make up some blanks.
https://cimg2.ibsrv.net/gimg/www.rx7...c7ce85666e.jpg https://cimg5.ibsrv.net/gimg/www.rx7...96836dd37f.jpg https://cimg1.ibsrv.net/gimg/www.rx7...b46daeb84d.jpg Intakes filled https://cimg2.ibsrv.net/gimg/www.rx7...58a1e80ce6.jpg Few simple blanks made up https://cimg5.ibsrv.net/gimg/www.rx7...5ba27da3c7.jpg https://cimg0.ibsrv.net/gimg/www.rx7...324ac19611.jpg Eccentric shaft turned up, just need to fit oil jets and get it balanced. https://cimg5.ibsrv.net/gimg/www.rx7...539e1e4259.jpg This is the alternator i will be using. Its a 140amp from a LS1 Holden Commodore. Scored it for $120 and gave it a tidy up. https://cimg9.ibsrv.net/gimg/www.rx7...8ccd344f01.jpg Decided not to half arse the oil system. On the left is a S5 oil pump. On the right is a 4 stage R4 Peterson oil pump. Should provide plenty of pressure and flow at 10000 rpm. |
Nice, getting a serious collection of parts together there. Keep up the good work.
Darryl |
Made up a few bits. An alternator bracket, oil pump bracket and drive mandrel. Since i am on gearbox number 4 in my Rx7, i decided to use a Tex Racing 4 speed dog box on the 4 rotor. I imported it from North Carolina a few months ago, worked out cheaper than a tremec and should be a lot stronger. I will use an FC bellhousing and make an adapter. Also made an engine assembly stand. Going to use a car jack to set the e shaft height to get the centre plate on.
https://cimg8.ibsrv.net/gimg/www.rx7...f8bb17d3fc.jpg https://cimg0.ibsrv.net/gimg/www.rx7...0668524bb0.jpg https://cimg2.ibsrv.net/gimg/www.rx7...dc1f6f33a3.jpg https://cimg5.ibsrv.net/gimg/www.rx7...92b73be6a5.jpg https://cimg6.ibsrv.net/gimg/www.rx7...51ad6d2c85.jpg https://cimg9.ibsrv.net/gimg/www.rx7...62b7370b6c.jpg https://cimg1.ibsrv.net/gimg/www.rx7...a2b942b994.jpg Diy powdercoated, more details on this in my next post. https://cimg7.ibsrv.net/gimg/www.rx7...57ddd48f04.jpg https://cimg5.ibsrv.net/gimg/www.rx7...f6190c6687.jpg https://cimg9.ibsrv.net/gimg/www.rx7...cd5293dc53.jpg The gearbox is a Tex Racing T101 which has a magnesium case so it weighs about the same as a factory rx7 gearbox https://cimg0.ibsrv.net/gimg/www.rx7...edea4cbfd4.jpg https://cimg6.ibsrv.net/gimg/www.rx7...b04c446812.jpg |
Nice is that an engine stacking table?
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Nice work! I like where this is going!
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Originally Posted by Johnny Kommavongsa
(Post 12126643)
Nice is that an engine stacking table?
Most of the accessory parts on the engine are going to be polished or powder coated, thought i might show you guys how i do the powder coating. Its a cheap Chicago Pneumatic rig but it works really well. https://cimg6.ibsrv.net/gimg/www.rx7...d0a40ce99a.jpg 1st step is to sandblast the parts. https://cimg8.ibsrv.net/gimg/www.rx7...78b0ac1363.jpg Next step is to clean the parts. I use methylated spirits. https://cimg1.ibsrv.net/gimg/www.rx7...f7590883a9.jpg Wired up so each bolt is grounded. https://cimg3.ibsrv.net/gimg/www.rx7...0a1764960f.jpg Next step is to spray the parts, bit difficult to take a photo while spraying. https://cimg4.ibsrv.net/gimg/www.rx7...0efc8cef78.jpg Parts are then cooked for 10mins at 200°c. https://cimg5.ibsrv.net/gimg/www.rx7...8315fbc930.jpg Finished https://cimg6.ibsrv.net/gimg/www.rx7...8070c0c526.jpg https://cimg7.ibsrv.net/gimg/www.rx7...9df44a1bb3.jpg Did the CAS aswell https://cimg8.ibsrv.net/gimg/www.rx7...2360e8d3f4.jpg The coating is durable enough to coat fastners with. https://cimg4.ibsrv.net/gimg/www.rx7...f7fad585b3.jpg NRS apex seals 1 piece 2mm x 12 |
bloody hell this is nice
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<subscribing>
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Wicked build mate! Looking forward to this!
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i would ditch the CAS if i were you, you really don't need your timing wandering on something you put this much money into.
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Originally Posted by RotaryEvolution
(Post 12127397)
i would ditch the CAS if i were you, you really don't need your timing wandering on something you put this much money into.
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you will be fine on an n/a then, i just would never put a turbo(s) on it with the CAS, 4 rotors with all of them bouncing around would be fairly bad compared to a simple 2 rotor which usually manages to get by(somewhat, though still not ideal).
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https://cimg5.ibsrv.net/gimg/www.rx7...3f57500487.jpg
Painted the plates with this stuff. Seems a lot tougher than other spray paints i've used. https://cimg9.ibsrv.net/gimg/www.rx7...7ac9817e00.jpg https://cimg6.ibsrv.net/gimg/www.rx7...baad64a584.jpg |
https://cimg6.ibsrv.net/gimg/www.rx7...17161cee58.jpg
Rotor housings all cleaned up waiting for assembly https://cimg9.ibsrv.net/gimg/www.rx7...824573c19b.jpg Seals and springs https://cimg4.ibsrv.net/gimg/www.rx7...2527354dc2.jpg Got the rotating assembly balanced and rotors side clearanced, thanks to Grant at Rotorsport Racing & Engine Balancing. https://cimg9.ibsrv.net/gimg/www.rx7...6b77f1ab8c.jpg Machining the out oil groove in the rotor bearings. https://cimg8.ibsrv.net/gimg/www.rx7...3c7f505e63.jpg Clearancing side seals. Set up this jig on the drill press using a scrap rotor. The grinding wheel is for a dremel. Used the fastest speed on the drill and it worked really well. Only messed up 1 side seal out of 24 which isn't to bad.<br/> |
Following
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https://cimg2.ibsrv.net/gimg/www.rx7...f7260da5e5.jpg
All seals clearanced ready to be fitted to the rotors https://cimg3.ibsrv.net/gimg/www.rx7...d6983b86cf.jpg https://cimg5.ibsrv.net/gimg/www.rx7...6aa3853e37.jpg https://cimg7.ibsrv.net/gimg/www.rx7...1980f4bba3.jpg Its nice working with brand new parts. https://cimg0.ibsrv.net/gimg/www.rx7...f6900e9049.jpg All seals fitted, ready for assembly. |
Assembled the engine, with no issues at all. From putting the front plate down on the assembly table to bolting on the rear counterweight it took only 4 hours. The assembly was done by myself so used a car jack to set the e shaft height to get the center plate on. Turns overs nicely with all pulses sounding even. Photo quality is a bit average, my hands were covered in oil the whole time.
https://cimg2.ibsrv.net/gimg/www.rx7...b31d65895a.jpg View of the stationary gear mod https://cimg6.ibsrv.net/gimg/www.rx7...227ce5e934.jpg #1 rotor https://cimg1.ibsrv.net/gimg/www.rx7...a4201fb7ba.jpg https://cimg2.ibsrv.net/gimg/www.rx7...7644012597.jpg https://cimg5.ibsrv.net/gimg/www.rx7...a5365219fc.jpg Thought getting this center plate on would be a bit tricky, but it pretty much fell into place. https://cimg2.ibsrv.net/gimg/www.rx7...d573c0048d.jpg #3 rotor https://cimg5.ibsrv.net/gimg/www.rx7...1c22c9e98e.jpg https://cimg1.ibsrv.net/gimg/www.rx7...45dc0d0f7b.jpg https://cimg6.ibsrv.net/gimg/www.rx7...3ec47292ea.jpg #4 rotor https://cimg0.ibsrv.net/gimg/www.rx7...936f7d826d.jpg https://cimg4.ibsrv.net/gimg/www.rx7...e136e37a5b.jpg A completed 4 rotor apart from front stack. |
God damn those are some pretty parts
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https://cimg5.ibsrv.net/gimg/www.rx7...ff508b4b7f.jpg
Set the endplay, was able to use a spacer i had laying about which was easy. https://cimg3.ibsrv.net/gimg/www.rx7...e53f3ec3ee.jpg Gave Cosmo #1 a wash and took it for a drive https://cimg7.ibsrv.net/gimg/www.rx7...ed429f6703.jpg |
https://cimg6.ibsrv.net/gimg/www.rx7...67473b64c8.jpg
Front cover installed https://cimg7.ibsrv.net/gimg/www.rx7...58524563f0.jpg https://cimg8.ibsrv.net/gimg/www.rx7...bb138929c9.jpg Using an Xtreme Rotaries ewp adapter with -20AN fittings, really nice part all cnc machined. https://cimg9.ibsrv.net/gimg/www.rx7...b61c421640.jpg https://cimg0.ibsrv.net/gimg/www.rx7...8c2c6ba570.jpg |
I purchased a 1200mm x 400mm plate of 6061 T6 to make the transmission adapter and oil pan out of.
https://cimg8.ibsrv.net/gimg/www.rx7...7155f6ba0f.jpg Its really heavy, weighs about 33kgs. https://cimg1.ibsrv.net/gimg/www.rx7...ca3e473d2b.jpg The plate is 1 inch thick which makes it difficult to cut on a band saw. I used a 64 tooth carbide tipped circular saw blade designed for aluminium. To make the 400mm cut above it only took about 3mins. https://cimg0.ibsrv.net/gimg/www.rx7...f80bae42f1.jpg Getting the plate to thickness for trans adapter https://cimg4.ibsrv.net/gimg/www.rx7...d609987d55.jpg https://cimg6.ibsrv.net/gimg/www.rx7...7b29209812.jpg |
https://cimg6.ibsrv.net/gimg/www.rx7...41ebc7ccef.jpg
Cut a chunk off the transmission flange. https://cimg0.ibsrv.net/gimg/www.rx7...5db1ebd670.jpg Starter motor now fits https://cimg3.ibsrv.net/gimg/www.rx7...42fc52d33a.jpg Swarf everywhere https://cimg1.ibsrv.net/gimg/www.rx7...21c71bc3bb.jpg Test fit https://cimg4.ibsrv.net/gimg/www.rx7...501940a7e3.jpg https://cimg5.ibsrv.net/gimg/www.rx7...835366b411.jpg Finished adapter |
wow very nice
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Magic. Puts it into perspective how long it is with the tranny bolted up.
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Originally Posted by WANKfactor
(Post 12133948)
Magic. Puts it into perspective how long it is with the tranny bolted up.
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Not f#cking about ah ya, well done, great progress
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Because the car is so light now being completely stripped out the suspension was sitting way too high. So purchased some D2 adjustable coilovers. Fitted them in about 3 hours with no issues which was a surprise.
They are made in Taiwan but the quality seems good. Not really too many options out there for Cosmo suspension. By the way the wheels are Work Emotion D9R 18x8.5 +38 front and 18x9.5 +38 rear. Front tyres are 235 Goodrides haha and rears are 255 Nitto Invos. https://cimg3.ibsrv.net/gimg/www.rx7...1530681d88.jpg Towed the car out of the tent with the mighty Honda. https://cimg5.ibsrv.net/gimg/www.rx7...dd431c78b5.jpg https://cimg7.ibsrv.net/gimg/www.rx7...5976abdb6e.jpg Before https://cimg8.ibsrv.net/gimg/www.rx7...c05be8c4cf.jpg After. The rear can go lower once the inner guard lip has been rolled. |
Taiwan has some pretty good manufacture these days.
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Aragosta makes coilovers for us, if you ever see a used set in good condition I'd highly recommend getting them. The set I have now are 4th different set of brand coilovers I've tried and they are phenomenal.
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Haven't really achieved much on the 4 rotor. Been busy fitting a new turbo to my rx7.
https://cimg9.ibsrv.net/gimg/www.rx7...4b6aa71878.jpg Started making the sump. Used building paper as a template which wasn't the best idea. https://cimg0.ibsrv.net/gimg/www.rx7...7aa073a466.jpg https://cimg1.ibsrv.net/gimg/www.rx7...fe435a8ac4.jpg https://cimg2.ibsrv.net/gimg/www.rx7...bcbd0ffd6f.jpg https://cimg4.ibsrv.net/gimg/www.rx7...d9c2a17d84.jpg A few of the holes required a bit of massaging, but overall turned out good. Still need to machine out baffles and oil pick up points. https://cimg5.ibsrv.net/gimg/www.rx7...21ba376900.jpg The engine bay of the rx7. Its a 1986 FC. Extend port, garrett gt3582r. 360rwhp. First rotary i have built, 20000kms later still going hard. https://cimg3.ibsrv.net/gimg/www.rx7...d36376844e.jpg |
https://cimg5.ibsrv.net/gimg/www.rx7...0faeca4d1c.jpg
Finished the final shape of the sump https://cimg6.ibsrv.net/gimg/www.rx7...58f2c0dd5e.jpg https://cimg9.ibsrv.net/gimg/www.rx7...feb05e9eec.jpg Started to make a bracket for the alternator and oil pump https://cimg1.ibsrv.net/gimg/www.rx7...6822da2295.jpg https://cimg2.ibsrv.net/gimg/www.rx7...ece8fbc338.jpg https://cimg3.ibsrv.net/gimg/www.rx7...09600f9f5a.jpg Ended up with a giant swarf pile. |
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I only have one question. Is your house also built out of giant thick plates of aluminum? ;)
Great Fab work. Carry on. |
Awesome and inspiring work mate.
Well done. |
Awesome build mate !! So love it. This si the very reason I haventsold my 20B JC yet. Wish to do a similar thing one day, such a perfect car for a 4 rotor!!
Love the work your all doing yourself too |
Originally Posted by Bitchn7
(Post 12145842)
Awesome build mate !! So love it. This si the very reason I haventsold my 20B JC yet. Wish to do a similar thing one day, such a perfect car for a 4 rotor!!
Love the work your all doing yourself too https://cimg7.ibsrv.net/gimg/www.rx7...05f733398a.jpg Start of the engine mounts. Will bolt straight to the foward subframe mounts. |
I'm in the Waikato. Had my car for over 10 years now I think. Was bought into NZ new in 91 by Mazda.
Sold the 20B, but have ideas of what i can do with the beast. |
https://cimg7.ibsrv.net/gimg/www.rx7...67c232994e.jpg
Bending the engine mounts, bender is bolted to the forks on the forklift. https://cimg8.ibsrv.net/gimg/www.rx7...206d244dd7.jpg https://cimg9.ibsrv.net/gimg/www.rx7...a1f78aaf04.jpg https://cimg0.ibsrv.net/gimg/www.rx7...c0d9b01204.jpg |
Subscribed.
Very excited to see how this ends up! Nick |
Wow! Great work so far!
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