Karack

those are series 4 with about 175k miles on them. the cleaned looking housing was the first i used to experiment on resurfacing with and was in poorer condition than the used housing below it. i considered them both to be garbage before working out the process.

they both actually came from the same motor.

nycgps

iTrader: (1)

cuz you can't search for ****.

learn how to use a "PROPER" keyword.

I have 6-7 times more post count than him. so I can be an a-hole, right ?

LEARN HOW TO SEARCH

nycgps

iTrader: (1)

oh yeah, I remember you said that you're trying to do the re-surfacing too, how does that work out?

I mean honestly I would never bother with re-surfacing, cuz I think new part saves me a lot of time, but some budget builders might find your service useful.

Karack

12A rotor housings are NLA, early 13B housings are already on the chopping block to be gone from the shelves soon as well. soon people won't have any alternatives so something has to be worked out sooner or later.

i have about 6 engines in service with them now having only started doing them about 3 months ago none of them have been giving me any sign of issue. in fact i just was in california last week and tuned an engine with my resurfaced housings, an S4 9.4:1 turbo motor. i thought he had it broken in but in fact when i arrived i came to find out the motor had 30 mins of idling and the hybrid turbo i built him still had the assembly oil on the housing... i tuned it anyways and the motor pulled quite impressively for having about an hour of no load run time.

i do recommend strictly premixing on them though, as the chrome surface is thinned close to half original thickness.

vacuum was about average @ 15-16"Hg at 960 RPM with a street ported motor with minimal break in.

drifthappens

for the first part of the thread, yeah, some people here think we're driving ferrari's or something.

anyone, I'd much rather premix than not, safety margin in my eyes, especially as the OMP ages, and doesn't potential do it's job as efficiently.

nycgps

iTrader: (1)

yeah, 12A housings are history. and Mazda is running low on the Early 13B housings. I think they're still making S6 housings but it won't be long until they stop that too.

that is actually pretty good ! even at 1/2 the thickness, a nice and smooth surface is always better than bumpy ones.

OMP, at least the electronic one, it's a stepping motor made by Nippon Denso, so it either work, or it's dead.

well, at least when the OMP dies on the 8, the ECU will sense it and nothing else will happen other than limp mode (it totally sucks, just saying) and the cost of remove/install the OMP (and whatever crap u need)

for the S5 FC, if the OMP dies, most of the time it will "take" the ECU down with it ... lucky there are so many used ECUs around, otherwise oh man not gonna be funny.

the nozzle on the other hand might be the problem. 9k found out his 8's injectors are clogged. same thing for me on my FC and I have to clean it with brake cleaner.


speaking of S5 OMP (or whatever), it should be rebuildable ... the motor is made by Denso, the rest is just metal and a couple rubber gasket here and there ... and Mazda wants 1.5K for that ****? I'm surprised no one thought about trying to find the right part and Rebuild them ... I know OMP is not the best thing but I can see a big market right there ... S5, S6, or RX-8.

Karack

can try the seafoam trick in the other thread through the OMP lines.

i just hate thinking of adverse effects in the jets though, i haven't dissected any but if they have a simple rubber diaphragm then they can be susceptible to failure from some detergents.

i hate seafoam but i'd have to think it's less harsh on rubber parts than carb/brake cleaner is.

dannobre

iTrader: (3)

They have a ball valve...so it won't likely hurt anything...just not sure it does much

The Seafoam would go through the air bleed nozzle...not where the oil comes out....

drifthappens

Sorry, I didn't mean the OMP itself, but it and everything else associated with it.

ASH8

HUH?..

Center of Apex does not need much lubrication!!!...OK...care to explain why Mazda added two center Injectors on the Series 2 2009 RX-8??, with an all new EMOP System?

Why are you posting peripheral RX-7 Rotor Housings?,they DON'T have the same MOP system as the Series 1 RX-8.

The S2 RX-8 Metering Oil System now used IS the best they have ever made for any Rotary.
It can only be bettered by a separate fresh oil supply tank and that will never happen.

olddragger

iTrader: (3)

i didnt follow that either.
Didnt Eric M post that the side seals dont last as long with the omp disconnected and just using pre mix?

RIWWP

iTrader: (2)

Correct.

Karack's knowledge, as valuable as it is, is heavily RX-7 biased. He is still off the mark on some of the RX-8 / Renesis specific items. To my knowledge, side seals weren't a problem for the RX-7s.