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Couple of things ...............check for wear at sides of housings where the apex assist piece runs .... put straight edge across face to check no gaps . If it's not too bad ...you may get away with a hone . On the irons check the area that the corner seal passes over besides the exhaust ports isn't stepped . if you can feel it with your thumbnail .... no good.
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Originally Posted by strokercharged95gt
(Post 4876154)
Looks good. I know some people will say you need all new housings etc., but I would just verify everything is in spec and not damaged, buy a new closing kit and get it back together. Chances are something else will blow well before anything else is truly unusable... :cool: If your are iffy on that, you may look into resurfacing those housings. I got mine done at Freelance and they came back looking brand new for like $300.
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Originally Posted by Brettus
(Post 4876156)
Couple of things ...............check for wear at sides of housings where the apex assist piece runs .... put straight edge across face to check no gaps . If it's not too bad ...you may get away with a hone . On the irons check the area that the corner seal passes over besides the exhaust ports isn't stepped . if you can feel it with your thumbnail .... no good.
I checked housing inner surfaces w/a straight edge, and found no issue. Sent the housings to Goopy where they will also eval for refurbishing suitability for a successful re-build. Irons appear good as well, i.e. mirror smooth, no step anywhere. While, of course, w/it cracked open I'll replace anything deemed questionable, but I also consider that the engine was running fine..., well actually, until the water seal failed. |
What are causes for blown water seals ?
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Originally Posted by Sydo
(Post 4876195)
What are causes for blown water seals ?
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Originally Posted by jcbrx8
(Post 4876177)
Brett, Thanks for the guidance. I checked housing inner surfaces w/a straight edge, and found no issue. Sent the housings to Goopy where they will also eval for refurbishing suitability for a successful re-build. Irons appear good as well, i.e. mirror smooth, no step anywhere. While, of course, w/it cracked open I'll replace anything deemed questionable, but I also consider that the engine was running fine..., well actually, until the water seal failed. For those shiny irons, you may want to look into the Lynn Hanover hand lapping method (posted somewhere over on nopistons). You essentially scuff up the surface of the iron using a kerosene or other lubricant and orbital hand sander and some light grit sandpaper. It dulls the finish without removing too much material (leaving the nitride layer). Supposed to help with the motor break-in and help retain lubrication on the side seals which is probably most important on a rx8 engine where the side seal goes over the exhaust port. Here is a picture of before and after of my irons if you are interested. I spent under $100 on this process which was better than $1500 for new irons. https://cimg7.ibsrv.net/gimg/www.rx8...2eb0e464dc.jpg |
Originally Posted by strokercharged95gt
(Post 4876202)
Good move on the refurbishment. I am currently using the pineapple closing kit with the HD water seals and have had no issues. I used Vaseline to install my water seal though a lot of people use a type of sealant.
For those shiny irons, you may want to look into the Lynn Hanover hand lapping method... edit: Good to hear the vote of confidence on the Pineapple close kit & HD seals. |
Progress update...porting - To open exhaust port flow and avoid potential carbon build up :nono: shown in the first pic...I ported the mid-iron exhaust ports w/ the RB Street Port template. Then enlarged the template a bit and ported the end irons ~ 5% larger ...w/ attention to runner transition on all. Edit: ***It's imperative to avoid the coolant cavities w/in the irons. The Racing Beat porting template instructions provides some detail as to how to avoid them.*** https://cimg0.ibsrv.net/gimg/www.rx8...27fa75f940.jpg Carboned exhaust port... . https://cimg3.ibsrv.net/gimg/www.rx8...d6b78ac2b3.jpg RB template over OEM exhaust port https://cimg0.ibsrv.net/gimg/www.rx8...2079d64b29.jpg Very poor OEM casting corners and transitions. Paid particular attention to upper narrow area, lower lip, and hidden transition into the runner. https://cimg1.ibsrv.net/gimg/www.rx8...641bee87bd.jpg Was surprised to see how much larger the runner interface to the back of the exhaust port is. https://cimg2.ibsrv.net/gimg/www.rx8...678d06a1d4.jpg Mid-iron nearly finished product https://cimg3.ibsrv.net/gimg/www.rx8...f6733347cd.jpg Enlarging the RB template to port the end-iron exhausts ~5% larger than the mid-iron exhausts. Objective here is twofold: 1) to further increase exhaust flow capacity, and 2) to bias a higher % of exhaust flow to the end iron exhausts ... and by default away from the Siamese port. |
Finished ported end irons, new (used) refurbished housings from Goopy, cleaned rotors, and my Atkins closing kit w/ a couple extras...
Not shown ... - Pineapple HD water seals - Pineapple 1x one-piece solid dowel, 1x one-piece hollow dowel - Turblown stud kit ...nearly ready to begin assembly. :) https://cimg7.ibsrv.net/gimg/www.rx8...293e6d2676.jpg Finished end-irons w/ exhausts "street ported" https://cimg2.ibsrv.net/gimg/www.rx8...1e23940baa.jpg Finished exhaust ported mid-iron https://cimg8.ibsrv.net/gimg/www.rx8...e0413181ad.jpg Cleaned rotors...ready for springs & seals https://cimg0.ibsrv.net/gimg/www.rx8...775848911f.jpg New used & refurbished housings from Goopy https://cimg1.ibsrv.net/gimg/www.rx8...4390ead2bb.jpg . https://cimg9.ibsrv.net/gimg/www.rx8...fee82fee5b.jpg Atkins closing kit w/ Pineapple HD water seals... |
Loving the detail of your updates my man, keep posting!
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Everything is looking real good. The studs are a bit overkill, but overkill isn't a bad thing.
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Originally Posted by RotaryMachineRx
(Post 4877408)
Loving the detail of your updates my man, keep posting!
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Originally Posted by strokercharged95gt
(Post 4877418)
Everything is looking real good. The studs are a bit overkill, but overkill isn't a bad thing.
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This build thread is great. I’m considering going the same route you are with a rebuild with a street port and overbuilding the shit out of the engine and then throwing turblowns 7670 kit on there. So this has def helped me out a lot. Keep the pics and build coming! |
Originally Posted by Rkesh88
(Post 4877423)
This build thread is great. ... |
Love this build. Out of curiosity, why are you using the Pineapple water jacket seals instead of the Atkins seals?
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Originally Posted by TomD_Cincy
(Post 4877427)
Love this build. Out of curiosity, why are you using the Pineapple water jacket seals instead of the Atkins seals?
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Looking good, thank you for documenting all this, it's inspiring for those of us looking to take the plunge.
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Get a professional to do your clearances
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Originally Posted by skc
(Post 4877558)
Get a professional to do your clearances
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Progress update: Spring & seal installation into rotors... Note: Take note of oil control & side spring installation orientation. https://cimg9.ibsrv.net/gimg/www.rx8...5538501933.jpg Oil control ring installation... https://cimg6.ibsrv.net/gimg/www.rx8...4d11eac23a.jpg Side spring & seal clearancing and installation... https://cimg8.ibsrv.net/gimg/www.rx8...c228c61de9.jpg Front rotor front face corner & side spring and seal installation complete. https://cimg7.ibsrv.net/gimg/www.rx8...83383b66ea.jpg corner & side spring & seal installation complete. |
Front iron, housing, and rotor assembly... https://cimg2.ibsrv.net/gimg/www.rx8...695608ef3f.jpg Front stationary gear installed into front iron https://cimg8.ibsrv.net/gimg/www.rx8...2a9dea0301.jpg Front iron lubed https://cimg4.ibsrv.net/gimg/www.rx8...0347c4a0c7.jpg Inner & outer water seals into front housing. (Chose to go with the Pineapple HD water seals) https://cimg6.ibsrv.net/gimg/www.rx8...5dc8f2c4eb.jpg Mazda OEM springs & seals https://cimg5.ibsrv.net/gimg/www.rx8...9d576666c1.jpg Apex spring and seal installation :bluesuit: That feeling when the apex seal fully slides down and seats. ;) :uh: :sad: That feeling when it doesn't... https://cimg7.ibsrv.net/gimg/www.rx8...47e544eb52.jpg Apex springs & seals installed on front rotor |
E-shaft, intermediate iron, and Pineapple one piece dowel installations... https://cimg0.ibsrv.net/gimg/www.rx8...719c0b4544.jpg E-shaft installed... https://cimg1.ibsrv.net/gimg/www.rx8...003695abf1.jpg Intermediate iron assembly was pretty easy w/ an engine stand. Tilted the stand untlil the rear end of e-shaft was just above horizontal. Pulled the e-shaft out ~1" ...and d/t the stand angle it will stay out. Added the mid-iron, then rotated the engine stand vertical again (rear of engine assembly up), and everything seated up. intermediate iron installed w/ OEM 1/2 height dowels (hidden) https://cimg6.ibsrv.net/gimg/www.rx8...247a1e460.jpeg Half height dowels extracted, and one piece dowels installed via clamping the assembly, extracting the OEM 1/2 height dowels (w/out disturbing the assembly positioning), and inserting the full length dowels...bottom position first (which appears to be a hair tighter)...then the top dowel position. |
Rear housing, rotor, and apex seal installation... Note: Take care to align corner seals beforehand AND not to disturb them when placing the rotor on the assembly. If by Murphy's law a bottom corner seal is disturbed / turns slightly as it did on me, there's a fix. Rather than removing the rotor, etc I ground the edge of an old apex seal to a wedge, inserted it into the offending apex seal groove to realign the bottom corner seal. Then was able to install & fully seat the new springs and seal. https://cimg0.ibsrv.net/gimg/www.rx8...277c998449.jpg rear rotor & housing installation https://cimg1.ibsrv.net/gimg/www.rx8...68167d8e31.jpg rear rotor apex spring & seal installation https://cimg2.ibsrv.net/gimg/www.rx8...af52ab3ae4.jpg rear rotor installation complete Note: Forgot to snap a pic of the rear rotor housing w/ water seals installed w/ hylomar and lower legs Permatex grey sealed. (Similar to first pic in post #123) |
Short block assembly almost complete... https://cimg8.ibsrv.net/gimg/www.rx8...2ed68342f4.jpg Rear iron installation https://cimg5.ibsrv.net/gimg/www.rx8...60267b7fa8.jpg Turblown stud kit installation https://cimg0.ibsrv.net/gimg/www.rx8...2bbc7b482b.jpg ...torqued to 46 ft lbs. EDIT: Returned later and retorqued the studs to 42#. See post #185. Note: Pleased w/the stud kit. Obvious quality and torquing precision improvement over OEM tension bolts. https://cimg0.ibsrv.net/gimg/www.rx8...1ab56c6755.jpg Iron & housing assembly complete https://cimg1.ibsrv.net/gimg/www.rx8...f20f13a4ed.jpg Short block ...rear https://cimg2.ibsrv.net/gimg/www.rx8...2c03fc5a23.jpg Short block ...front Next up: front stack |
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