Possible New Renesis Engine Failure Theory?
#751
WENTGERMAN
iTrader: (6)
Why doesn't someone just try to run the engine for 1k miles without premix and 1k miles with premix, and measure the oil level? Of course with similar driving style...
Also, please pardon me for this stupid question, but what is the best way to check oil level? (hot/cold...etc...) I always feel like I cannot get a consistent reading on this car.
Also, please pardon me for this stupid question, but what is the best way to check oil level? (hot/cold...etc...) I always feel like I cannot get a consistent reading on this car.
#752
Registered
iTrader: (2)
So this is what I don't get. By warm does it mean after the engine gets warmed up, shut the engine down, wait 5 minutes and check it, or check it while the engine is still running?
It feels like every minute passing by after the engine shuts down the oil level changes a little bit. Maybe I am just panaroid.
#755
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Oil level changes after you shutdown because every surface of the engine has an oil film on it and all the passages are full. After a few minutes most of this oil returns to the pan. If you run large equipment you will see quite a difference in oil level between when you shut it off and 15 minutes later.
#756
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Update: I sprayed out and soak the oil injectors last night, and the check valves are all passing now. So, for the sake of experimentation, I'm only changing the lines. My lines have darkened quite a bit, and I can't tell the difference from the outside if oil is in them or not.
I'll give it a few thousand miles and see if they remain unstuck. If so, that could save a lot of money for other people in the future.
My RX is used only in autox and fun now, so a couple thousand miles may be this fall.
I'll give it a few thousand miles and see if they remain unstuck. If so, that could save a lot of money for other people in the future.
My RX is used only in autox and fun now, so a couple thousand miles may be this fall.
#757
Oil level changes after you shutdown because every surface of the engine has an oil film on it and all the passages are full. After a few minutes most of this oil returns to the pan. If you run large equipment you will see quite a difference in oil level between when you shut it off and 15 minutes later.
i haven't tried it on the Rx8, but its a good parlor trick on the older rotaries, as the oil level is the same....
#759
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Oil level changes after you shutdown because every surface of the engine has an oil film on it and all the passages are full. After a few minutes most of this oil returns to the pan. If you run large equipment you will see quite a difference in oil level between when you shut it off and 15 minutes later.
That is what I observed as well. Every minute after the engine shuts down the oil level increases a little. Checking the engine oil in the morning after the car has not been running for so long gives me a more consistent result, but that is not what the manual says.
#760
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Join Date: Nov 2009
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Keep doing it your way Maxchao,you can't get a better reading any other time.Ask any professional truck driver, machine operator . They always dip the oil before first start up.It's called preventative maintenance.
#762
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I check oil probably every few hundred miles just to make sure the engine is still burning oil, since it is very critical that it does. So at 1qt/1k miles we are talking about maybe 0.5 qt here...which seems to be around where the engine oil level difference is between warm and cold engine.
Also if people don't mind me start another heated discussion...if the OMP is indeed positive displacement pump, then how can the nozzle get clogged...? The oil has to go somewhere no?
#763
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iTrader: (3)
Back to original thread, I just rebuilt an 04 with 96k. Internals were in great shape with minimal wear. All 4 oil injectors were clean with working check valves. Only things wrong with the engine were weak side seal springs and the side seal gaps were huge (all greater than 20thou some much wider). I think it was assembled by Mazda on a Monday, no it was not a remain.
#764
Registered
Ok it is very interesting because something similar happened to me.
After changing oil I am pretty sure that with hot engine the oil level was exactly at max indication. Since then I was heavily premixing and I found out that the oil level is not going down ! I used to see 100ml oil consumption every 200kms with my driving habits but to my surprise oil level at the dipstick was constant !
I started to suspect clogged OMP injectors/lines but that was not the case after a check that was conducted. To make matters worse , sometimes while measuring the oil I saw oil level increased ! I started measuring the oil level on a dead cold engine at the morning. After that I suspected antifreeze or fuel mixing with my oil but again that was not the case because antifreeze level was constant and the oil appearance was not indicating fuel mixing.
Finally, the oil level started decreasing after 1300kms which is too slow concerning my driving habits.
You can say that there was too much oil at the beginning after the oil change but I guess not because there were times in the past that had overfilled oil pan with oil and never had NO OIL CONSUMPTION and OIL INCREASE LEVEL !!!!
You can even say that I do not know to measure the oil level correctly BUT It would sound strange not knowing to measure oil level after 196.000Km with the same car !
After changing oil I am pretty sure that with hot engine the oil level was exactly at max indication. Since then I was heavily premixing and I found out that the oil level is not going down ! I used to see 100ml oil consumption every 200kms with my driving habits but to my surprise oil level at the dipstick was constant !
I started to suspect clogged OMP injectors/lines but that was not the case after a check that was conducted. To make matters worse , sometimes while measuring the oil I saw oil level increased ! I started measuring the oil level on a dead cold engine at the morning. After that I suspected antifreeze or fuel mixing with my oil but again that was not the case because antifreeze level was constant and the oil appearance was not indicating fuel mixing.
Finally, the oil level started decreasing after 1300kms which is too slow concerning my driving habits.
You can say that there was too much oil at the beginning after the oil change but I guess not because there were times in the past that had overfilled oil pan with oil and never had NO OIL CONSUMPTION and OIL INCREASE LEVEL !!!!
You can even say that I do not know to measure the oil level correctly BUT It would sound strange not knowing to measure oil level after 196.000Km with the same car !
#765
Ok it is very interesting because something similar happened to me.
After changing oil I am pretty sure that with hot engine the oil level was exactly at max indication. Since then I was heavily premixing and I found out that the oil level is not going down ! I used to see 100ml oil consumption every 200kms with my driving habits but to my surprise oil level at the dipstick was constant !
I started to suspect clogged OMP injectors/lines but that was not the case after a check that was conducted. To make matters worse , sometimes while measuring the oil I saw oil level increased ! I started measuring the oil level on a dead cold engine at the morning. After that I suspected antifreeze or fuel mixing with my oil but again that was not the case because antifreeze level was constant and the oil appearance was not indicating fuel mixing.
Finally, the oil level started decreasing after 1300kms which is too slow concerning my driving habits.
You can say that there was too much oil at the beginning after the oil change but I guess not because there were times in the past that had overfilled oil pan with oil and never had NO OIL CONSUMPTION and OIL INCREASE LEVEL !!!!
You can even say that I do not know to measure the oil level correctly BUT It would sound strange not knowing to measure oil level after 196.000Km with the same car !
After changing oil I am pretty sure that with hot engine the oil level was exactly at max indication. Since then I was heavily premixing and I found out that the oil level is not going down ! I used to see 100ml oil consumption every 200kms with my driving habits but to my surprise oil level at the dipstick was constant !
I started to suspect clogged OMP injectors/lines but that was not the case after a check that was conducted. To make matters worse , sometimes while measuring the oil I saw oil level increased ! I started measuring the oil level on a dead cold engine at the morning. After that I suspected antifreeze or fuel mixing with my oil but again that was not the case because antifreeze level was constant and the oil appearance was not indicating fuel mixing.
Finally, the oil level started decreasing after 1300kms which is too slow concerning my driving habits.
You can say that there was too much oil at the beginning after the oil change but I guess not because there were times in the past that had overfilled oil pan with oil and never had NO OIL CONSUMPTION and OIL INCREASE LEVEL !!!!
You can even say that I do not know to measure the oil level correctly BUT It would sound strange not knowing to measure oil level after 196.000Km with the same car !
#768
Registered
iTrader: (1)
This thread is all over the place.
Update: Put new lines on. New gaskets and washers on as well. Buttoned it all up and started it. Watched oil slowly come up all 4 lines from the OMP.
Now, I have an autox 200 miles away 1 way Saturday, so we'll see if this translates into oil consumption. I will still be premixing.
Update: Put new lines on. New gaskets and washers on as well. Buttoned it all up and started it. Watched oil slowly come up all 4 lines from the OMP.
Now, I have an autox 200 miles away 1 way Saturday, so we'll see if this translates into oil consumption. I will still be premixing.
#769
i stopped premix for 2 tanks and instead added 1oz per gallon of Marvel Mystery Oil....
the car seems to prefer this to 2cycle oil.... with a noticible improvement in starting/accelleration/etc..... *(mpg stays at a constant 14mpg... **(damn you right foot!!))
the car seems to prefer this to 2cycle oil.... with a noticible improvement in starting/accelleration/etc..... *(mpg stays at a constant 14mpg... **(damn you right foot!!))
#770
#772
This thread is hilarious.
Obviously the quart of oil your engine is supposed to use in 500 miles is replaced with fuel and oil in those 500 miles. In some cases more fluid goes into the oil pan than what is actually used!!!
HOW???
SCIENCE!!!
Seriously guys? Come on...
Obviously the quart of oil your engine is supposed to use in 500 miles is replaced with fuel and oil in those 500 miles. In some cases more fluid goes into the oil pan than what is actually used!!!
HOW???
SCIENCE!!!
Seriously guys? Come on...
their plan..
step 1... add oil at night while owner sleeping..
step 2... ????
step 3... PROFIT!!
#775
Registered
Imo a premix-amount exists of oil-molecules and gasoline-molecules
I could imagine that when burning a mixture of oil and gasoline the gasoline-molecules will burn relatively "first/earlier/more quick" as the oil-molecules (all beiing in a milli-second environment or whatsoever) and therefore enabling some oil to remain if all gasoline is burned already?.
In a piston-engine the 4-stroke oil is (besides the crankshaft etc.) also lubricating the contact between piston and cylinder-wall and as far as I know both in the upward compression stroke as in the downward expansion stroke where the burning/flaming gas from the ignition is not completely burning the 4-stroke oil-layer , since if yes there would be no lubrication film for the upward stroke any more.
Imo in a piston-engine some 4-stroke oil survives during the combustion in the expanding combustion area, indicating that this is similar in a rotary-engine.
Anyway, I just ordered a self-test set enabling an individual (indicative) test for evt. (non)presence of water, fuel and carbon as well as the general condition of the engine-oil.
Thanks and best regards,
Ruud
PS: Thanks for your opinion, Harlan
I could imagine that when burning a mixture of oil and gasoline the gasoline-molecules will burn relatively "first/earlier/more quick" as the oil-molecules (all beiing in a milli-second environment or whatsoever) and therefore enabling some oil to remain if all gasoline is burned already?.
In a piston-engine the 4-stroke oil is (besides the crankshaft etc.) also lubricating the contact between piston and cylinder-wall and as far as I know both in the upward compression stroke as in the downward expansion stroke where the burning/flaming gas from the ignition is not completely burning the 4-stroke oil-layer , since if yes there would be no lubrication film for the upward stroke any more.
Imo in a piston-engine some 4-stroke oil survives during the combustion in the expanding combustion area, indicating that this is similar in a rotary-engine.
Anyway, I just ordered a self-test set enabling an individual (indicative) test for evt. (non)presence of water, fuel and carbon as well as the general condition of the engine-oil.
Thanks and best regards,
Ruud
PS: Thanks for your opinion, Harlan