NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   Rotary Engine Building and Porting FAQ Section (https://www.nopistons.com/rotary-engine-building-porting-faq-section-85/)
-   -   What's Absolutely Necessary When Rebuilding? (https://www.nopistons.com/rotary-engine-building-porting-faq-section-85/whats-absolutely-necessary-when-rebuilding-12637/)

Judge Ito 02-23-2003 03:55 AM
Originally Posted by rx7tt95' date='Feb 23 2003, 03:15 AM
Well that's the big question....Check out the porting thread. Setzep, since you have an RE, what did you do? Isn't it possible just to remove a bunch of the material as you would with the FD's exhaust sleeves? Ito? What would you recommend?



Yes, it's a 2 rotor, not a three. Cost was $1600 with shipping.



If porting the exhaust sleeves isn't an option, I guess I'll replace them with FD sleeves. I've also heard there are some custom sleeves available out there as well but I haven't had a chance to do any searches for them yet.



I've pretty much decided to replace all the seals except for the side seals. If the side seals turn out to be inexpensive then I'll probably replace those too. There was soooo little internal wear on this engine though.
replace the diffusers with the FD ones. I have a simple trick to pulling out the pins on the diffusers. After trying so many different ways, from drilling the roll pins to cracking open a busted rotor housing. I learn of a better way. Let me know if your intrested in the trick.



Ok when it comes down to your used side seals. Try this first. When you install the new corner seals, then, when you install the used sideseals, just measure your sideseal to cornerseal gap. Acceptable specs are .002- .006 if you have a bigger GAP then .006 I would highly recomend you replace the sideseals.

Judge Ito 02-23-2003 04:00 AM
Originally Posted by Fd3BOOST' date='Feb 22 2003, 11:29 PM
[quote name='Judge Ito' date='Feb 22 2003, 05:08 AM'] 6 inner and 6 outer oil rings?? he needs 4 inner and 4 outer oil rings. I think he has a 13B Cosmo engine not a 20B Cosmo engine..





If your going to rebuild this engine I would agree with FD3boost.... every single seal is mandatory for good compression and reliability. Atkins apex seals work, but stock Mazda 2mm seals are better. Make sure you use a nice Micro-meter and the necessary gauges and tools to mic and clearance every single part. From your engine bearings to your seal clearances to the wear on the side housings, to the width on the rotor housings, to the end-play on the flywheel.
Arghhh, Ito how do you do all that measuring.. It's enough to make your eyes pop out. https://www.nopistons.com/forums/pub...IR#>/blink.png [/quote]

Honestly I really enjoy measuring every single seal and engine part. It just takes the guessing game away and makes me feel so sure of my work. But you have a Valid Point it does get to be a little Xtreme on your eyes,back and BRAIN starts to hurt after a while.

JLB 02-23-2003 08:26 AM
Judge - I would love to hear how you get the roll pins out of the exhaust inserts! I have tried several ways but they are sush a hard steel that I have yet to find a good reliable way.



BTW - there have been several posts in the last week on the pinned porting thread - have you checked it out?



Jason

Judge Ito 02-23-2003 09:20 AM
Originally Posted by JLB' date='Feb 23 2003, 02:26 PM
Judge - I would love to hear how you get the roll pins out of the exhaust inserts! I have tried several ways but they are sush a hard steel that I have yet to find a good reliable way.



BTW - there have been several posts in the last week on the pinned porting thread - have you checked it out?



Jason
I haven't checked the pinned thread. Ill checked it out. Ill reply later on tonight on the pin removal..

rx7tt95 02-23-2003 10:05 AM
Yes I definitely would like to hear how you do it! So it's no good to just hack the crap out of the Cosmo sleeves huh? I'll be sure to measure everything as well. Thanks for the advice. And Judge, what's your real name??? https://www.nopistons.com/forums/pub...>/rolleyes.gif

Judge Ito 02-23-2003 10:16 AM
Originally Posted by rx7tt95' date='Feb 23 2003, 04:05 PM
Yes I definitely would like to hear how you do it! So it's no good to just hack the crap out of the Cosmo sleeves huh? I'll be sure to measure everything as well. Thanks for the advice. And Judge, what's your real name??? https://www.nopistons.com/forums/pub...>/rolleyes.gif
Hmm you want me to reveal my Identity... no problem. My real Name is Juan Rivas. intials for J.R.'s Rotary Performance Shop. that I own. Ill let you in a little secret. for the people that know me, I have never ever been called Juan by them. Even my Mother calls me "Ito" Ito is my giving nickname by my father when I was born. In my 31 years of life, I've never heard my mother call me Juan. My dad too. For the first 7 years of my Life, I thought Ito was my real name.. I could remember my mother yelling at me: ITOOOOOOOOOOOOOOOOOOOOOOO stop taking your bicycle aparttttttttttttt!!!!!!!!! https://www.nopistons.com/forums/pub...IR#>/smile.png the Judge was added later by a good friend of mine. that in it's self is another story. So for my friends here on the forum. Ill respond faster to Ito then Juan..

setzep 02-23-2003 12:54 PM
Originally Posted by rx7tt95' date='Feb 22 2003, 09:15 PM
Well that's the big question....Check out the porting thread. Setzep, since you have an RE, what did you do? Isn't it possible just to remove a bunch of the material as you would with the FD's exhaust sleeves? Ito? What would you recommend?
I haven't opened my engine because it has such good compresson so the stock sleves are still in place. It's kind of funny, some people say they will be ok then there are others that say get those things outa there! So my question is will these sleves kill any hopes of HP with a single turbo?? Anyone?



Also I'd like to know the easy way to remove the sleves Judge if you would be so kind https://www.nopistons.com/forums/pub...IR#>/smile.png

93 R1 02-23-2003 12:54 PM
I was wondering that too. Thanks for clearing that all up for us https://www.nopistons.com/forums/pub...#>/biggrin.png

rx7tt95 02-23-2003 01:03 PM
Great story Ito! I'd show up at the local rotary shop and say "well Judge Ito said such and such" and they'd look at me like I was loco. https://www.nopistons.com/forums/pub...#>/biggrin.png



If and when you have time, do check out the porting thread as I posted a bunch of images of the Cosmo innards...Just need your opinion before I get started. Thanks to FD3's help/links, I was able to get a hold of 8 carbide bits and an electric rotary grinder(25K rpm)for well under $100. I have at least another week and a half recovery time (shoulder surgery) to sit around and port my engine and measure everything out. You can only watch so much Oprah!

93 R1 02-23-2003 01:06 PM
You really shouldn't watch that, its bad for you


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