Notices
Series I Tech Garage The place to discuss anything technical about the RX-8 that doesn't fit into any of the categories below.

Possible New Renesis Engine Failure Theory?

Old 04-26-2013, 03:34 AM
  #776  
Boosted Kiwi
iTrader: (2)
 
Brettus's Avatar
 
Join Date: Apr 2006
Location: Y-cat-o NZ
Posts: 18,440
Received 269 Likes on 209 Posts
Originally Posted by Rudolph View Post
I have my engine oil tested........there is no fuel and no water dilution.........this makes me believe that with heavy premixing some 2 stroke oil is getting resolved into the 4 stroke engine oil as reported in my previous posts; as well as reported by fellow-Rexdrivers and rotary aviation pilots .........
I have seen enough instances of unexplained lack of oil consumption on this forum to think ........................ you are really onto something here .
Brettus is online now  
Old 04-26-2013, 09:04 AM
  #777  
Registered
iTrader: (1)
 
MikeTyson8MyKids's Avatar
 
Join Date: Jun 2006
Location: Columbus, IN
Posts: 460
Likes: 0
Received 2 Likes on 2 Posts
Originally Posted by Brettus View Post
I have seen enough instances of unexplained lack of oil consumption on this forum to think ........................ you are really onto something here .
Agreed, it happens in other platforms too.

I watched my OMP lines fill, watched air bubbles travel down the lines. Yet, crank case oil level remains approx the same.
MikeTyson8MyKids is offline  
Old 04-26-2013, 09:23 AM
  #778  
The Don
iTrader: (1)
 
don_peppino24's Avatar
 
Join Date: Jun 2011
Location: Toronto, Ontario
Posts: 205
Likes: 0
Received 0 Likes on 0 Posts
just removed my omp injectors and threw them into an ultrasonic cleaner as well as cleaned the lines by flushing them out with wd40, going to remove the whole omp unit itself and clean in there while adding the sohn adapter.

but while removing the omp injectors, i found that one of them was not torqued down enough and i could unscrew it with my fingers, didnt need to break it loose which was very scary for me.

hopefully with the sohn i can actually see the oil consumption and have some peace of mind.

thanks for this thread or i may have had a broken rex and an empty bank account. (if this does fix the problem)
don_peppino24 is offline  
Old 04-26-2013, 12:45 PM
  #779  
Registered
 
Join Date: Apr 2011
Location: Colorado
Posts: 274
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Rudolph View Post
I have my engine oil tested........there is no fuel and no water dilution.........this makes me believe that with heavy premixing some 2 stroke oil is getting resolved into the 4 stroke engine oil as reported in my previous posts; as well as reported by fellow-Rexdrivers and rotary aviation pilots .........
Rud, do you happen to know what method of fuel/water dilution testing your lab is doing? Here we have 1 major lab that does a calculation based upon oil shear while many smaller ones actualy test for fuel and water product/byproduct. That will make a difference in validating the accuracy of the tests.

For me Blackstone consistantly shows little or now fuel at <.5%, but they use the calculation method. Polaris and whoever Dyson uses actually tests for fuel and they usually come back around 2-2.5% and I know Im getting plenty hot to burn most that off.
Iluvrevs is offline  
Old 04-26-2013, 01:12 PM
  #780  
Registered
 
Rudolph's Avatar
 
Join Date: Jul 2009
Location: Utrecht, Netherlands
Posts: 223
Received 0 Likes on 0 Posts
EU

Originally Posted by Iluvrevs View Post
Rud, do you happen to know what method of fuel/water dilution testing your lab is doing? Here we have 1 major lab that does a calculation based upon oil shear while many smaller ones actualy test for fuel and water product/byproduct. That will make a difference in validating the accuracy of the tests.

For me Blackstone consistantly shows little or now fuel at <.5%, but they use the calculation method. Polaris and whoever Dyson uses actually tests for fuel and they usually come back around 2-2.5% and I know Im getting plenty hot to burn most that off.
Hi Iluvrevs,
It was not a test from a lab but a simple/indicative selftest as announced in my previous post #741. I believe that the test with an oil drop on a testpaper is probabely doubtful, however I could not find any extreme negative experiences.
http://www.ipmsolutionsbv.nl/docs/mo...st_english.pdf
http://www.ipmsolutionsbv.nl/motoran...ranalyser.html
Here in Europe oiltests from labs are very expensive and very devious; actually only for industrial users and not for consumers.
For me it was sufficient to know whether there was fuel dilution in my 4-stroke oil yes or no.

Last edited by Rudolph; 04-26-2013 at 01:19 PM.
Rudolph is offline  
Old 12-27-2013, 10:38 PM
  #781  
New Member
 
Join Date: Sep 2012
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Firstly, I'm posting here because I can't find a specific enough thread, and am too new to start a new one. But I'm curious that oil lines my have something to do with it.

I'm chasing down a p0300 in my 2009 R3. I've done everything relating to the misfire resolution thread. Symptom wise, it acts like a coolant seal failure. Cold start, it randomly misfires, seemingly burning off whatever has collected in my engine and then settles and it practically unnoticeable after it is a little warm. This has persisted for almost a year now, with no real decline. Problem one is that it really doesn't seem like it's burning coolant. It smells fairly distinctly like oil, but the fact that the CAT has long since failed and was thus gutted, makes the smell test a little harder to decipher, as it would smell more foul anyway. But would you still be able to smell coolant among the other collected nasty that is escaping from my engine?

What is really odd, is that after an oil change and the one time I seafoamed to attempt a fix, I had a grace period of 3-5 days, where there was no issues on start up, until gradually it degraded back into the normal slump of random misfires every cold start. If it were a coolant leak all along, why would and oil change or seafoam affect it at all? What may or may not factor into this is that I have not been using genuine oil filters, which depending on who you ask, makes a difference. Charles at BHR says that ASH8's theory about the pressure differential on non genuine filters causing basically the oil system to by pass the filter all together is wrong (I'm paraphrasing and probably misquoting). But if true could that have clogged my oil lines causing excess back pressure in my lines ultimately causing the injectors to leak into my engine when left for too long?

I'm so F-ing confused. My nearest Mazda Dealership basically said that they didn't have working compression testers so I can't check that until they have new ones. Beyond that, is there anything else I should do other than pressure testing the coolant, oil and or fuel system?

I greatly appreciate any advise and I'm sorry if I'm too noob and haven't posted in the correct spot.
Awesomo666 is offline  
Old 01-06-2014, 12:31 AM
  #782  
Registered
Thread Starter
iTrader: (46)
 
9krpmrx8's Avatar
 
Join Date: Jan 2007
Location: San Antonio, Texas
Posts: 33,744
Received 347 Likes on 279 Posts
Missed this post. Charles is right, Ash8 is incorrect. You have an S2 which means a totally different oil metering system so this thread does not apply to you. There is a cycle on the S1 RX-8's that injects a little bit of oil into the combustion chamber upon shutdown. I suppose that on an S2 there could be a similar process and that too much oil could be being injected and thus causing your issues until it is burnt off. But this is just a guess and we would need more info to fully address your issue. I suggest starting a thread in the S2 subforum and then we can go from there.
9krpmrx8 is offline  
Old 01-06-2014, 05:29 PM
  #783  
New Member
 
Join Date: Sep 2012
Posts: 5
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by 9krpmrx8 View Post
Missed this post. Charles is right, Ash8 is incorrect. You have an S2 which means a totally different oil metering system so this thread does not apply to you. There is a cycle on the S1 RX-8's that injects a little bit of oil into the combustion chamber upon shutdown. I suppose that on an S2 there could be a similar process and that too much oil could be being injected and thus causing your issues until it is burnt off. But this is just a guess and we would need more info to fully address your issue. I suggest starting a thread in the S2 subforum and then we can go from there.
Thank you very much!
Awesomo666 is offline  
Old 03-14-2018, 06:12 AM
  #784  
Registered
 
kevink0000's Avatar
 
Join Date: Sep 2017
Location: Arizona
Posts: 120
Received 10 Likes on 8 Posts
Thread revival

Ancient thread revival. Hopefully I didn't break any forum rules by posting here. I have read this thread with interest a couple of times, and now have a 2007 186000 mile s1 engine apart in my garage that was was well maintained by its owner, used GTX 5w-20 as long as he had it, who had the car from about 11000 miles till I picked it up at 186000. From what I have seen so far in this engine, and I will post pictures and start a new thread when I can since I am a noob, and the forum will not allow me to start one yet, the side seals in this daily driver car were not the main source of ultimate failure. The rotor housings showed pronounced wear, but no flaking, and the apex seals bore the brunt of the wear and were the source of the majority of compression loss as far as I can see. There were no signs of overheating in this engine, either localized (the sparkplug area cracks) or overall It also appeared than a chronic lack of top-end (to use a piston term) lubrication afflicts these engines in stock form, even with updated factory flashes. As others have stated elsewhere, the part-throttle low load oil map is inadequate in my opinion, and the whole oil injection system is designed for emissions reduction primarily and owner convenience second- long engine life and well-being were deemed a tertiary concern. However, I think the map at high load high rpm (beyond where normal emissions testing is done) is what "saves" the engine from quicker death in certain circumstances; (a redline a day, etc) not just from carbon blowoff, but also accessing the factory high load oil map regularly keeps a more advantageous level of lubricant in the top end- temporarily and sporadically at least.
( Like the Racing Beat comment on their site about increased HP coming with increased oil introduction, and then slowly going away after returning to stock levels, which has been documented to occur in 2 stroke piston engines as well. Probably occurs from both better sealing and lower friction, which from what I see in my engine, lower friction and less metal-metal contact in the chamber would be a very good thing.)

I am adding to this thread because I found it interesting and largely helpful prior to this teardown. But, the info here shows that the Renesis fails differently in a racing environment than my engine did in long term "normal" street use. This may have been covered before in the forum, but I was unable to find a long-term high mileage original engine teardown post. I thought you guys will find it interesting. Will have pics and a fresh teardown post up as soon as I get all the pictures together.

Last edited by kevink0000; 03-14-2018 at 06:13 AM. Reason: weird az thing
kevink0000 is online now  
The following 3 users liked this post by kevink0000:
Brettus (03-14-2018), RotaryMachineRx (03-14-2018), yyz (03-14-2018)
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
vapor2
West For Sale/Wanted
1
09-15-2015 06:38 PM
badinfluence
Series II Aftermarket Performance Modifications
6
08-31-2015 11:51 AM
Sifu
RX-8 Parts For Sale/Wanted
3
08-30-2015 10:51 PM
Eirulisse
New Member Forum
13
08-15-2015 12:34 PM
mazdaverx7
Series I Tech Garage
3
07-21-2015 07:31 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 1 votes, 5.00 average.

Quick Reply: Possible New Renesis Engine Failure Theory?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.