Crash

Doesn't pineapple give you new sidehousings anyway?

Astro

dont forget the canadian guys :b
www.rotaryengine.com

r0t0rhead

iTrader: (12)

Just to clarify a few points regarding the quality of Mazda Remans- Yes in the past couple years they have improved considerably. These are -contrary to popular belief- remanufactured at the Delco-Remy plant in Jax'ville FL. Not in Japan. Actually most of the remans we receive do have new rotor housings-but not all of them- none have had all new side housings, in fact one had a barely acceptable center housing with a really poor port job. Out of the last 5 we have received and upgraded- 3 had new rotor housings, 1 had a new center housing and 1 new engine rotor. While all of the engines were deemed acceptable-none could be classified as "new" nor were they any better than even our stage 1 engine rebuilds- the used side housings that Mazda installed were not reconditioned but did meet tolerances for wear-they were not blanched or lapped. Although these represent a reasonable value the fact is they do not contain many of the upgraded features that should be considered for high performance or higher than stock boost pressure.
Ultimately there are no guarantees regarding how many new parts are installed the only guarantee is the factory warranty. Yes you can start with their engine and upgrade it but in many cases its more effective to rebuild you're existing engine and upgrade accordingly.
Regards
Bryan Smith
Rotorsports Racing

r0t0rhead

iTrader: (12)

One more note- Mazda remans are notorious for oilpan leaks- so if you order one -be sure to have the oilpan re-sealed WITH a gasket and a very good sealant- we use Permatex's professional grade "The Right Stuff" Import specific sealer-much better than the run of the mill RTV availablat discount auto houses. Leaks are non existent but if you ever have to remove the oilpan you'll need to buy a new one.

artguy

the mazda remans have been failing in quantity. the above post is right...the leaking problem is true.

you get what you pay for.


I think of the most recent five remans that rotary reliability and racing installed I think THREE failed in the first six months. To my knowledge they now recommend against getting a reman.

why get a reman done in a factory by a guy who isnt really interested in rotaries and is collecting paychecks when you can buy from a true rotary enthusiest and master engine builder like those mentioned in the thread.

plus..streetport....now thats what Im talking about.


j

SleepR1

Bryan,

Thanks for chiming in on this! Great to read a post from the engine builder of the 12A rotary motors going into the new Diasio D962R race/track day cars http://www.diasio.com/d962r.html

FWIW, in my case, Kim Barninger is tearing down my Malloy Mazda Reman to port the intake/exhaust, oil/coolant passages, install silicone o-rings, and add heavy duty 2-mm apex seals, plus some dowel pin work (not sure what this is?); so I'll be aware of my reman's quality once Kim tears into the motor.

I'm confident that Kim/Dave (KDR Performance Inc.) and Ray Crowe (Malloy Mazda Parts Manager) have dealt long enough with each other that if KDR found my reman less-than-suitable, that they'd call Ray Crowe for another one? At least that's my hope? I'll ask him via email on this...

FWIW, Kim and Dave warranty their ported motors for assembly and leaks, but I am not sure if there's additional warranty for the port job of the motor, ie premature failure?

Yes, I presumed most folks on the Rx7 Forum knew that Mazda remanufactured motors are done in the United States and NOT Japan

yzf-r1

iTrader: (1)

mr. rx7tt (forum member) ported my Malloy reman engine (thank you, Chris!) and told me it had new rotor housings....he also told me the rotors and side housings, while used, were in fantastic shape....now, granted, this motor was hand picked by Ray out of a batch of 10, so maybe I got a little bit lucky

the remans seem to be a bit of a hit-or-miss deal as others have said, so I think it's always a good idea to have a professional builder break it open, do the reliability opgrades (teflon seals and eccentric shaft mod), and inspect the components for abnormal wear

of course the best option is just spring for a brand new motor, but that is 5 large and most people can't afford it....I think a used engine with all new housings and rotors would be at least $3500, correct me if I'm wrong

Bryan at Rotorsports is R&Ring my engine and doing some miscellaneous work to it....I recommend him to anyone in the area

r0t0rhead

iTrader: (12)

YZF- thanks for the kind recommendation-Sounds like you have a very good plan in upgrading your engine. As for the actual costs involved in a complete engine rebuild versus a reman with overhaul, you are pretty accurate.
Yes- for a "complete" engine rebuild with new rotor housings, lapped side housings, all new seals & springs, gaskets, teflon/silicon compression seals, new rotor and main bearings, new oilpump and driven chain, plus upgraded apex seals, viton 0 rings for the oil control rings, viton dowel pin 0 rings, viton rear stationary gear 0 ring, modified e-shaft with constant flow jets, e-shaft thermal pellet, rotor housing coolant passages modified,and all apex, corner, and side seals individually clearanced-you'll pay a bit over $3500.
Afterall Mazda owns the parts and can recover their costs more effectively than a small company who must order the parts from them. Is it worth the difference? Perhaps not - but in our opinion, and experience, in the long run these are worthwhile improvements. I have seen enough re-mans that contained parts that met specs for Mazda that wouldn't pass ours- ie rotors that showed evidence of prior detonation, used bearings, used oilpumps, etc. The fact is these engines are built within factory tolerances and are guaranteed for a limited time on unmodified RX7's. In this intended application their engines should perform as expected-which is reasonable for the cost to the consumer. Mazda NA is also aware that many owners have modified their cars beyond the limits that these engines were designed for. Naturally they have also educated their service personnel to watch for modifed cars when claims are filed. After all Mazda is in business to survive and perhaps make a profit.

smerkinseven

ok guys.. i just got a reman put in by mazda last year... i would like to get my motor ported within the next year... what are my plans???

SleepR1

Well according to Bryan, just have yours rebuilt and ported?