Possible New Renesis Engine Failure Theory?
07-13-2011, 12:04 PM
#553
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How did you verify that the injector nozzles were, in fact, clogged?
I've never seen one get clogged. I have seen the check valve fail (that is pretty common), but it would only be an issue on a boosted motor.
Oil consumption should be very low on a highway trip. The commanded injection amount is very slight.
Even with the increased values I command in my AP tuning, I never see more than 1/8 of a quart per 300 miles of constant highway mileage.
I will go through 1/2 quart in 20 minutes on the track (about 15 miles, typically).
I've never seen one get clogged. I have seen the check valve fail (that is pretty common), but it would only be an issue on a boosted motor.
Oil consumption should be very low on a highway trip. The commanded injection amount is very slight.
Even with the increased values I command in my AP tuning, I never see more than 1/8 of a quart per 300 miles of constant highway mileage.
I will go through 1/2 quart in 20 minutes on the track (about 15 miles, typically).
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!
If you have the energy to do that DIY, it would be much appreciated. Even if most of us would not do it ourselves, a lot of us would benefit from the knowledge. I've learned a lot about our cars by reading DIYs that I doubt I'll ever do myself. As well as the ones that I've done or am planning to do when the time comes.
Ken
Ken
Edit: sorry if any of this has be covered previously but I am reading through this thread as we speak....
07-14-2011, 03:15 AM
#555
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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.
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.
07-14-2011, 09:09 AM
#556
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^ 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!!
08-29-2011, 02:04 AM
#561
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Don't forget about me!!
Still only one engine here she is running fine!!
new yorker--you like numbers--show/ share the numbers/ percentage that you have that the engine is not getting replaced very frequently? Can you do that?
Personnel experience in Ga--every rx8 owner I know-- except one, and he is really down on power--really down---have had their engines replaced--some more than once.
5w/20 oil, out of control temps, multiple factory pcm
flashes, gas with ethanol, poor fuel pump, engine hot spots due to water pump cavatation etc, no magnet in the oil system, lowest oil pressure on a rotary engine, 9K rpm redline and engine is not balanced for that, 10:1 compression and weak ignition coils --add it up
the s1 renesis didnt have a chance.
I am interested in seeing how the S2 engine is holding up---so far so good?
OD
Personnel experience in Ga--every rx8 owner I know-- except one, and he is really down on power--really down---have had their engines replaced--some more than once.
5w/20 oil, out of control temps, multiple factory pcm
flashes, gas with ethanol, poor fuel pump, engine hot spots due to water pump cavatation etc, no magnet in the oil system, lowest oil pressure on a rotary engine, 9K rpm redline and engine is not balanced for that, 10:1 compression and weak ignition coils --add it up
the s1 renesis didnt have a chance.
I am interested in seeing how the S2 engine is holding up---so far so good?
OD
08-29-2011, 01:33 PM
#565
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^ 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!!
Assuming your talking about my previous post?
08-29-2011, 04:37 PM
#566
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Below the relevant link......
http://www.rx8forum.de/index.php?pag...26291&pageNo=1
Last edited by Rudolph; 08-29-2011 at 04:40 PM.
08-29-2011, 05:01 PM
#567
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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
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
08-29-2011, 05:43 PM
#568
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
Below the relevant link......
http://www.rx8forum.de/index.php?pag...26291&pageNo=1
(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.
08-29-2011, 05:51 PM
#569
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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!!
Thanks for the tip
Great service from Roswell Mazda-Archie is the Man!!
08-29-2011, 07:10 PM
#570
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
Below the relevant link......
http://www.rx8forum.de/index.php?pag...26291&pageNo=1
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.
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.
08-29-2011, 11:21 PM
#573
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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
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
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.
08-30-2011, 06:48 AM
#574
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...
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...