I am rolling my engine rebuild into my turbo build thread since now both will be done at the same time. I really wish the S2 motor swap was realistic :lol:

don't make me repeat myself ..... :p:

I haven't been noticing any less oil consumption than usual and I am premixing usually 6-8oz of 2-stroke with every fill up also; but after installing my turbo I realized my OMP hose and Jet air hose were accidentally swapped (meaning my OMP hose was connected Pre-TB to my chargepipe). Luckily I noticed this error before I had any tunes and I had not hit any positive manifold pressures before swapping the hoses back to their correct places. I now have a high pitched noise and a strong vaccum coming from my OMP hose connected just downstream of my MAF sensor (been there since I moved the lines back to their correct position). Check out his Video:


http://www.youtube.com/watch?v=Jxc498WVMPk




The line I am plugging with my thumb is the OMP hose.

I'm just hoping to get a little insight as to what might be causing this sound but from this thread and a few others I have read I am thinking that it is potentially one or more of my check valves on the OMP injectors. I see MM's post said it could be a potential issue on boosted motors but AFAIK nothing has been adversely affected (yet).

Has anyone seen this before or have any insight to if my guess about the check valves is correct? Thanks in advance!



Do you know what the cost of a new set of oil injectors is? I'm hoping to replace mine along with some of the lines.

^ +1



Edit: sorry if any of this has be covered previously but I am reading through this thread as we speak....

I believe the injectors were 50 each but honestly a buddy works at the dealer and go them for me at his price so I'm not sure.

In the UK the oil injectors are 64 GBP each.

Two of mine whistle when blown through but pass the leakdown tests just fine. I get the same sound you describe if I disconnect the hose.
I've heard a few others mention it too, usually noticed when aftermarket intakes are fitted.

^ hmm yeah it's very loud, I can hear it through the hood when I'm parked or at stoplights in traffic even, but I might try to pull those injectors and leakdown test each of them. If they are still good I wonder if fitting a check valve to my OMP intake hose would reduce the noise.... now just to find the time!!

Bump :)

Why?

Because there is some good discussion here :)

Very good, I learned a lot!

Don't forget about me!!
 

Still only one engine here she is running fine!!

How many miles?

If the above is true.... Wouldn't introducing a restriction to the omp vacuum line increase oil use?

If I'm not mistaken, I read something like that on the German RX-8 forum. IIRC some folks did a similar type of mod.

Assuming your talking about my previous post?

This is correct..... a restriction of the vac. line to a total opening of 2 mm increases the engine oil consumption from approx. 0,3 ltr per 1000 km to approx 0,5 ltr per 1000 km........I tried it myself and indeed these values were observed..........I have restored it to the original vac. opening because I prefer to premix.........
Below the relevant link......
http://www.rx8forum.de/index.php?pag...26291&pageNo=1

45k Not a daily driver. 90% time driven on mountain roads having fun. A few track days, couple long vacation trips. Premix since 5-6k miles, oil changes average every 2k with 5/20 until last week. Went to 15/40. Knocking wood now!! No problems at all, still running like new.
My first rotary, a car guy by definition, change all other fluids very regulary(like driving on a 600 mile vacation, in 100 degree temps, change oil, drive home, change oil)
Love this thread!! Love to learn and listen.
Thanks to all

Yep... thanks Ruud, that's the thread I remembered.
(it requires registration to be able to view it, but the pics are pretty self-explanatory for those who don't understand German.)
Not sure I'd want to go this route though, I also rather premix.

FYI-I'll burn 1-1.5 quarts of oil per 2k miles. Premix 6-8oz, yamalube per tank(or more depending of plans for right foot!) seafomed last month. Will seafome oil injectors this weekend.
Thanks for the tip
Great service from Roswell Mazda-Archie is the Man!!

This is something I'm defiantly trying out. Thanks for that link.

Yes very self explanatory. I also pre-mix 4-6ozs, but would still like to increase oil consumption.


RotaryMachineRx, sorry I must have missed that post, most of my forum reading is done at work on my phone so its easy to get side tracked.

For that, I trust MazdaManiac's AP tune which increases the OMP rate as far as I know... that and my 6 oz premix per fillup should hopefully be enough :)

:uhh: Well I cant really afford that atm... Next $500 is going to shocks anyway. My warranty ends next month, I'll more than likely have one by the end of the year... Until then I wanna give this a shot.

I figured, most of the people that brag about having original motors have low mileage. Don't jinx yourself man. My first engine lasted 22k, second 74k, and third 30k. It's sort of hit or miss, even more so with remans. We just had our first 07' fail in the SARX group, it's a well maintained 07' with 49k on it.

it really sounds like hit or miss...

I have always wondered, does premix even help? In theory it certainly does, but I haven't seen any statistical data, plus I haven't seen anyone came out with a 150k engine and said I premixed from day one. Hence I wonder...

^ it's almost impossible to tell since Mazda likes rebuilding engines with used parts.

I want to check simply if there exists an oil nozzle with a failed check valve. Looking at the hose diagram, one hose (from the accordion tube) goes to a hub that splits out to all of the injectors. Using this end of the hose (and if I am understanding the physics correctly), applying a vacuum of 9.65+ psi and watching for a drop of 0.39 or more over a minute would indicate a failure in at least one nozzle.

Is this lazy-man's test valid?

I have the same question.... if this test is valid one or more of my injectors are effed as I tried this a while back.

I think a false positive is possible; i.e. an leak over the 1 minute 0.39 psi threshold could be distributed across the four nozzles. I may be over-thinking this ...

Don't feel bad, I over think everything.

Okay, guys. Rob at Pineapple finally had a chance to tear down my old Mazda Reman and the findings are troubling. I did not rebuild this motor, I had a perfectly running 2008 motor rebuilt instead. I am glad I did. I will post pics in a few minutes.

Now keep in mind that this motor was premixed and ran the SOHN from almost day one and only had 30,000 miles on it. Also, it ran BHR coils and no cat from break in. So, did the failing injectors cause this even though I was premixing 1oz per gallon when i realized my SOHN reservoir was not emptying like usual?

Copied from my build thread for those who don't visit that thread.

Okay guys, pics :( Still waiting on Rob to let me know how the bearings held up since I can't really tell from the pics.

http://www.flickr.com/photos/9krpmrx8/6153673850/http://www.flickr.com/photos/9krpmrx8/6153673806/http://www.flickr.com/photos/9krpmrx8/6153126501/http://www.flickr.com/photos/9krpmrx8/6153673406/http://www.flickr.com/photos/9krpmrx8/6153673244/http://www.flickr.com/photos/9krpmrx8/6153125837/http://www.flickr.com/photos/9krpmrx8/6153125777/http://www.flickr.com/photos/9krpmrx8/6153125759/http://www.flickr.com/photos/9krpmrx8/6153672804/
Not the best resolution but i zoomed in and they appear to have held up pretty well right?

http://www.flickr.com/photos/9krpmrx8/6153688222/

Bearing looks OK...

That rotor housing looks like crap ;)

Yeah, I am glad I decided not to rebuild this one.

As much as it hurts the pocket book...new housings are really a good idea for an engine you want to have less problems with

I agree 100%. It is interesting how different builders have different opinions on that sort of thing and what should and should not be replaced. I am so glad I chose Pineapple, overall it was just an awesome experience. Hopefully the motor lives up to my expectations.

Zoom Zoom....booom ;)

It's all in the tune :)

Totally agree, New Housing are a must on higher mileage engines in ANY rotary rebuild...anything else and you're totally compromising your rebuild, you might as well use used Apex Seals.

Straight away you can see this owner (9K) looked after this engine/car.
Bearings look very very good and e-shaft.
Check out the Side Seal gap to Corner Seal!

How many miles again, on this one 9K?

Apart from that everything else look normal to excellent!..:)

Congratulations on your care..9K!

Thanks for sharing the tear down 9krpmrx8.

Thanks :) This one had 30,000 miles on it. I plan on basically doing everything the same on the new motor but it should hold up much better.

Thanks, I am glad I was able to do this.

I reused my housings, still running strong.

Before acetone

http://a6.sphotos.ak.fbcdn.net/hphot..._1048597_n.jpg

After acetone

http://a6.sphotos.ak.fbcdn.net/hphot..._1954374_n.jpg

Sure the same condition will pop back up, but It's been doing pretty well so far. It really came down to how much money I had at the time. if I get 30k out of this one I'll be happy

Out of curiosity, is this considered Light/Normal/or Heavy Carbon build up?

-Shawn

I call the carbon, light-normal...without seeing the other Rotor...normal.

was that a normal or carbon 2mm apex seals?

I should also note that I did do the Zoom Zoom cleaner a few months ago.

Right, so after years of discussion we've narrowed the engine failures down to the few parts anywhere between the flywheel and the crank pulley....:lol:

what part of that seal looks like carbon seal to you ?

you sure is not "something" between the front bumper to the rear bumper ?

Pretty sure, I've narrowed that down by putting the engine in another car and still blowing a few up.

im going to go over to see rob some time this week and touch your motor, that way i can say i had a hand in the rebuild :)

of course if something breaks its not anything i touched ;)

https://www.rx8club.com/attachment.p...1&d=1316316042

My FC Engine pics, no zoom zoom cleaning (I can't do it, lol)

Unknown miles, why? cuz the last owner said the owner b4 him (last last owner?) had a rebuild engine about 30K miles ago.

but upon further inspection, I was like "no freaking way," cuz a lot of things were wrong with the engine, rubber plugs are MIA or never installed(melted?), still using older wire-type corner seal spring (seriously, this is a recent rebuild from 4+ yrs ago?) , wrong kind of Oil seal O-ring rubber (yeah, it was using the one Mazda said don't use it, and it's in pieces when I took it out, no wonder this engine was having massive oil leak/blown-by) , etc.

mind u all, those "black stuff" on the housing is NOT burn marks !!! it's actually silicone LOL ! I was like What the F ? It's every f-king where at places that you don't need it, but at places that NEEDS it, hmm, it's MIA. I was shock that this engine didn't leak from day one ...

well, if just an seal set and couple hours (oh fine, a day or 2) of time can get you another 30K miles hey, it's totally worth it.

You are lucky your engine was build properly, it was such a nightmare to clean my FC engine, I got cut like 50 times and I spent days just to try to scrap all those carbon and silicone off ... :(

I should just wipe (or soak) the housing with PB blaster and call it a day ...