AchillesGr

iTrader: (1)

hi,
i pulled this engine of my car 3 years ago and i stored it without any treatment. yesterday a open the engine and you can see what i found in the below pics.
there is a lot of rust in every where. the side, corner upex seals are stuck in a way that i doubt if i will manage to remove them.
please note that there is nothing brocken. also the engine seems that has very litle wear at the iron plates.
the engine is a stock one and worked fine. one day it refuses to start. so i pulled the car to a shop and the manager told me to change the engine or go for rebuild.
now as i look at the engine i have questions of what went wrong.

can anyone tell from the pics if this iron housing wear is normal?
parhaps what went wrong?

i assume that the corosion builds up leter as the engine was sitting for three years.the same for the stacked seals? or they stucked earlier and that lead to engine failure?

AchillesGr

iTrader: (1)

morre pics:

can i salvage anything from this engine?
is it posible to clean the corosion from housings and rotors and how?
thanks

AchillesGr

iTrader: (1)

guys, how can i post pics directly in the thread?

RotaryEngineIllustrated

On your rotor housing check this site: http://www.rebuildingrotaryengines.c...Rotor_Housings

Your rotors seem like they could be ok, as long as you can get the Side Seals out of the grooves, it looks like they are embeded in there pretty good. Alot of it can be restored. The rotor housing I can't tell because you don't have good enough pictures to tell from.

Seamoan

to make images you use the IMG code from your photobucket or whatever

AchillesGr

iTrader: (1)

hi,
thanks for the reply.
how can i clean all this mess?
the engine was sitting a long time ...

Banzai-Racing

iTrader: (11)

From your pics it looks like the front iron could be OK, it still needs to be spec'd out.

However, the other pictures indicate a coolant seal failure or you stored the engine in a damp place. In the pic of the housing and intermediate, that iron does not appear to be in such great shape, but that could be just oil and grime.

Look for obvious signs of coolant seal retaining wall failure:



Go get some degreaser (Purple Power, etc) and soak the rotors. Where rubber gloves. With some work you may be able to save them.

Sgtblue

iTrader: (16)

If you don't have Purple Power in Greece, try soaking that rotor in white vinegar for a few hours followed by an immediate hot water rinse and ALOT of WD-40 to clean up the rust and loosen the seals and springs. A container just large enough for the rotors and complete submersion would be best.

EvanchiX

iTrader: (1)

WoW 3 years, if you had no plans to do anything why pull it at all?

AchillesGr

iTrader: (1)

i did not plan to use again this engine. as i didn t knew a lot about rotaries, i folow the advise of the engineer and change the motor. now i was about to throw away that engine but on second thought i decide to open it and see what went wrong. now i do not see any obvius sighns. the internals seams to be in very good shape. the housings does not have any grooves at all. the same for the irons. there is only slight change in the nirror finish.
also i did not find any water seal failure like the one pictured by the banzai. all the orings was in place in one piece.
i will post more pics tomorow when i finish my cleaning to show you what i mean.

i suspect that there was nothing wrong with that engine and the engineer wanted to charge me for the motor changing. i think that the major damage is done by me by not storing the engine propriate.

so far i tried a nitro thiner, soap, break cleaner and wd40 on one rotor with no results.it seams that the wd40 works best from all the above.
i tried a wd40 with a scotch bright pad and it seems that it will do the job. i hope not to damade the surface of the rotor with that.but how to clean the small side seals grooves?
( i will try the vinegar also and keep you informed)

thanks!!

djseven

iTrader: (56)

The engineers first response to your car not staring was to replace the engine? Seems fishy, you probably let a good engine go to waste. The housings should clean up, the rotors will be pitted badly and not the greatest but will run. With irons it is almost always to difficult to tell by pics unless there is obvious damage.

arghx

iTrader: (3)

clean the carbon off the rotors and inspect the grooves

KKMpunkrock2011

iTrader: (5)

your rotors look like the ones I found in the back of an rx7 in a junk yard last summer, someone had pulled the motor out and opened it up and just left it in the trunk, the only hard parts missing were the e-shaft and one rotor. But it had been sitting, windows down, in a junk yard for a LONG time, not totally sure how long, but the rotors were rusty, and the rest of the hard internals looked to be in decent condition.

AchillesGr

iTrader: (1)

i was able to clean only the housings. none of the housings have a single scratch!! instead of this , i see that the housings do not have the miror finish like the iron plates.these are a litle dull??why? is it normal?. i did not saw other housings and i do not know how they should be. i will post some pics to show you guys there condition.

the irons also do not have any scratches.they have the wear grooves (fisheye) but there are areas that i think have coroded the chrome and i can not clean with any way. can i use any emery paper?

the rotors have carbon and rust and i do not know how to clean them. i heard that there is asmall soft cover but i i do not know how it looks to take care of it.
the front rotor had only carbon and i think i can clean it.
the rear have some brown corosion(water??) that i do not know how to clean. parhaps with a brass wire?what about this soft cover?

AchillesGr

iTrader: (1)

thanks

Banzai-Racing

iTrader: (11)

Rotor housings are supposed to have a dull finish, if they were "mirror" finish there would be a good chance that they are excessively worn.

Here is what new housings look like, minus the red paint:

CharlieUK

Now im confused, I just watched the great vid from Pineapple Racing about checking housings and the new ones that the chap showed were very shiney and chromed, you guys know what your talking about but your new housings are dull, why is that?

j9fd3s

iTrader: (3)

mazda has changed the coatings on housings over the years. that still looks really shiny to me, but maybe it was cast pre FD.

Banzai-Racing

iTrader: (11)

Maybe they were using some 12A housings that had higher mileage. The ones we have pictured are brand new FD housings.

Here are some shiny, worn out FD housings. Notice the striations in the surface and the cracks around the spark plug holes.



Here is a used FD housing, see how it still has a "cloudy" dull finish, these had 75K miles on them



Brand new 20B housings are dull as well:



Used S4 FC TII are dull:



Here is Mazdatrix page on identifying worn/bad housings http://mazdatrix.com/faq/rotorhsg.htm

CharlieUK

Thanks for clearing that up Mr Banzai, hopefully when I pull my FD engine it will be dull and healthy

AchillesGr

iTrader: (1)

guys,

I blew my motor last week . it was from apex failure.


I was in 3 gear with about 2300rpms with almost 0psi. I floor it and in a few seconds bang.the engine did not hit over 8psi.also if I open progressively the throttle the fuel is at 11.5afr until redline. So I assume that it is not from inadequate injector size.the engine did not reved over 6000rpms. As I saw at the wideband there was a lean situation imedietely as I step on the pedal for a few sec and then bang(afr about 14-15). I assume that it is the “inj vs acel tps” settings witch I have: 103-256, 37-256 , 20-35 .


here are the pics.please take a look .i do not know the mileage of this engine since it purchased as second hand.

i have some questions about some strange marks i found.
1)iron. what is these curved llines on the iron? is it normal?also there is some black marks like rust that i cannot clean them. is it good for reuse or not?how these black marks hapend?

2)take alook at the rotor. both rotors have some spots at the spark plug place
near the apex seal. there there is not a carbon build up and this spot is shiny and clear. is this normal or it has to do something about the spark plags i am using or the tuning?

3) housing lines. are these horizontal lines at the botom of the housing normal?is the patern around the exaust port normal?
please note the housing next that it is cleaned. it is more dull. the uncleaned housing is more shiny. i assume that the dull housing is better for reuse?

the rotor seems to be in good shape . i used 1oz 2stroke oil premix with omp still attached.

thanks

adam c

iTrader: (2)

Sounds like you needed a tune.

AchillesGr

iTrader: (1)

yes i need a tune....
but are these internals ok or not? parhaps somone can tell something looking at these?
thanks!